stabletailgraph: implement stable-tail sort

This adds the computation of the "stable-tail sort", an incremental node
sorting method. It is a stepping stone for the implementation of faster
label discovery (for example for obs markers) and more caching.

mercurial/stabletailgraph/stabletailsort.py

@@ -0,0 +1,110 b''
+# stabletailsort.py - stable ordering of revisions
+#
+# Copyright 2021-2023 Pacien TRAN-GIRARD <[e-mail]>
+#
+# This software may be used and distributed according to the terms of the
+# GNU General Public License version 2 or any later version.
+
+"""
+Stable-tail sort computation.
+
+The "stable-tail sort", or STS, is a reverse topological ordering of the
+ancestors of a node, which tends to share large suffixes with the stable-tail
+sort of ancestors and other nodes, giving it its name.
+
+Its properties should make it suitable for making chunks of ancestors with high
+reuse and incrementality for example.
+
+This module and implementation are experimental. Most functions are not yet
+optimised to operate on large production graphs.
+"""
+
+import itertools
+from ..node import nullrev
+from .. import ancestor
+
+
+def _sorted_parents(cl, p1, p2):
+    """
+    Chooses and returns the pair (px, pt) from (p1, p2).
+
+    Where
+    "px" denotes the parent starting the "exclusive" part, and
+    "pt" denotes the parent starting the "Tail" part.
+
+    "px" is chosen as the parent with the lowest rank with the goal of
+    minimising the size of the exclusive part and maximise the size of the
+    tail part, hopefully reducing the overall complexity of the stable sort.
+
+    In case of equal ranks, the stable node ID is used as a tie-breaker.
+    """
+    r1, r2 = cl.fast_rank(p1), cl.fast_rank(p2)
+    if r1 < r2:
+        return (p1, p2)
+    elif r1 > r2:
+        return (p2, p1)
+    elif cl.node(p1) < cl.node(p2):
+        return (p1, p2)
+    else:
+        return (p2, p1)
+
+
+def _nonoedipal_parent_revs(cl, rev):
+    """
+    Returns the non-œdipal parent pair of the given revision.
+
+    An œdipal merge is a merge with parents p1, p2 with either
+    p1 in ancestors(p2) or p2 in ancestors(p1).
+    In the first case, p1 is the œdipal parent.
+    In the second case, p2 is the œdipal parent.
+
+    Œdipal edges start empty exclusive parts. They do not bring new ancestors.
+    As such, they can be skipped when computing any topological sort or any
+    iteration over the ancestors of a node.
+
+    The œdipal edges are eliminated here using the rank information.
+    """
+    p1, p2 = cl.parentrevs(rev)
+    if p1 == nullrev or cl.fast_rank(p2) == cl.fast_rank(rev) - 1:
+        return p2, nullrev
+    elif p2 == nullrev or cl.fast_rank(p1) == cl.fast_rank(rev) - 1:
+        return p1, nullrev
+    else:
+        return p1, p2
+
+
+def _stable_tail_sort(cl, head_rev):
+    """
+    Naive topological iterator of the ancestors given by the stable-tail sort.
+
+    The stable-tail sort of a node "h" is defined as the sequence:
+    sts(h) := [h] + excl(h) + sts(pt(h))
+    where excl(h) := u for u in sts(px(h)) if u not in ancestors(pt(h))
+
+    This implementation uses a call-stack whose size is
+    O(number of open merges).
+
+    As such, this implementation exists mainly as a defining reference.
+    """
+    cursor_rev = head_rev
+    while cursor_rev != nullrev:
+        yield cursor_rev
+
+        p1, p2 = _nonoedipal_parent_revs(cl, cursor_rev)
+        if p1 == nullrev:
+            cursor_rev = p2
+        elif p2 == nullrev:
+            cursor_rev = p1
+        else:
+            px, pt = _sorted_parents(cl, p1, p2)
+
+            tail_ancestors = ancestor.lazyancestors(
+                cl.parentrevs, (pt,), inclusive=True
+            )
+            exclusive_ancestors = (
+                a for a in _stable_tail_sort(cl, px) if a not in tail_ancestors
+            )
+
+            excl_part_size = cl.fast_rank(cursor_rev) - cl.fast_rank(pt) - 1
+            yield from itertools.islice(exclusive_ancestors, excl_part_size)
+            cursor_rev = pt

tests/test-stabletailgraph.t

@@ -0,0 +1,710 b''
+====================================
+Test for the stabletailgraph package
+====================================
+
+This test file contains a bunch of small test graphs with some minimal yet
+non-trivial structure, on which the various stable-tail graph and stable-tail
+sort functions are tested.
+
+Each case consists of the creation of the interesting graph structure, followed
+by a check, for each noteworthy node, of:
+- the stable-tail sort output.
+
+In the ASCII art of the diagrams, the side of the exclusive part which is
+followed in priority is denoted with "<" or ">" if it is on the left or right
+respectively.
+
+The intermediary linear parts in the example graph are there to force the
+exclusive part choice (made on a min rank condition).
+
+
+Setup
+=====
+
+Enable the rank computation to test sorting based on the rank.
+
+  $ cat << EOF >> $HGRCPATH
+  > [format]
+  > exp-use-changelog-v2=enable-unstable-format-and-corrupt-my-data
+  > 
+  > [alias]
+  > test-sts = debug::stable-tail-sort -T '{tags},'
+  > test-log = log --graph -T '{tags} rank={_fast_rank}'
+  > EOF
+
+
+Example 1: single merge node
+============================
+
+A base case with one branchpoint "b" and one merge node "e".
+
+The exclusive part, starting with the lowest-ranking parent "c" of "e",
+appears first in stable-tail sort of "e" and "f".
+
+#        f
+#        |
+#        e
+#        |
+#      --<--
+#      |   |
+#      c   d
+#      |   |
+#      --+--      <- at this point, the sort of "e" is done consuming its
+#        |           exclusive part [c] and jumps back to its other parent "d"
+#        b
+#        |
+#        a
+
+  $ hg init example-1
+  $ cd example-1
+  $ hg debugbuilddag '.:a*a:b*b:c<b+2:d*c/d:e*e:f.'
+  $ hg test-log
+  o  tip rank=8
+  |
+  o  f rank=7
+  |
+  o    e rank=6
+  |\
+  | o  d rank=4
+  | |
+  | o   rank=3
+  | |
+  o |  c rank=3
+  |/
+  o  b rank=2
+  |
+  o  a rank=1
+  
+
+Check the sort of the base linear case.
+
+  $ hg test-sts c
+  c,b,a, (no-eol)
+
+Check the stable-tail sort of "e": "c" should come before "d".
+
+  $ hg test-sts e
+  e,c,d,*,b,a, (no-eol) (glob)
+
+Check that the linear descendant of the merge inherits its sort properly.
+
+  $ hg test-sts f
+  f,e,c,d,*,b,a, (no-eol) (glob)
+
+  $ cd ..
+
+
+Example 2: nested exclusive parts, without specific leap
+========================================================
+
+"g" is a merge node whose exclusive part contains a merge node "e".
+We check that the stable-tail sort recurses properly by delegating.
+
+Notice that parts of the sort of "e" is an infix of the sort of "g".
+This is an expected property of the sort.
+
+#           g
+#           |
+#        ---<---
+#        |     |
+#        e     |    <- while processing the sort in the exclusive part of "g"
+#        |     |       we recursively process the exclusive part of "e"
+#      --<--   f
+#      |   |   |
+#      c   d   |
+#      |   |   |
+#      --+--   |
+#        |     |
+#        b     |
+#        |     |
+#        ---+---    <- done with excl(g), jump to "f"
+#           |
+#           a
+
+  $ hg init example-2
+  $ cd example-2
+  $ hg debugbuilddag '.:a*a:b*b:c<b+2:d*c/d:e<a+6:f*e/f:g.'
+  $ hg test-log
+  o  tip rank=14
+  |
+  o    g rank=13
+  |\
+  | o  f rank=7
+  | |
+  | o   rank=6
+  | |
+  | o   rank=5
+  | |
+  | o   rank=4
+  | |
+  | o   rank=3
+  | |
+  | o   rank=2
+  | |
+  o |    e rank=6
+  |\ \
+  | o |  d rank=4
+  | | |
+  | o |   rank=3
+  | | |
+  o | |  c rank=3
+  |/ /
+  o /  b rank=2
+  |/
+  o  a rank=1
+  
+Display the sort of "e" for reference
+
+  $ hg test-sts e
+  e,c,d,*,b,a, (no-eol) (glob)
+
+Check the correctness of the sort of "g",
+and that a part of the sort of "e" appears as an infix.
+
+  $ hg test-sts g
+  g,e,c,d,*,b,f,*,a, (no-eol) (glob)
+
+  $ cd ..
+
+
+Example 3: shadowing of a final leap
+====================================
+
+We have a merge "f" whose exclusive part contains a merge "d".
+
+The inherited parent of "d" is not in the exclusive part of "f".
+At the end of the exclusive part of "d",
+the leap to "c" is shadowed by the leap to "e", i.e. the inherited part to "f".
+
+Notice that emitting "c" before "e" would break the reverse topological
+ordering.
+
+#           f
+#           |
+#        ---<---
+#        |     |
+#        d     |
+#        |     e
+#      --<--   |
+#      |   |   |
+#      |   +----
+#      b   |
+#      |   c
+#      |   |
+#      --+--       <- at this point, jumping to "e", not the shadowed "c"
+#        |
+#        a
+
+  $ hg init example-3
+  $ cd example-3
+  $ hg debugbuilddag '.:a*a:b<a+2:c*b/c:d<c+3:e*d/e:f.'
+  $ hg test-log
+  o  tip rank=10
+  |
+  o    f rank=9
+  |\
+  | o  e rank=6
+  | |
+  | o   rank=5
+  | |
+  | o   rank=4
+  | |
+  o |  d rank=5
+  |\|
+  | o  c rank=3
+  | |
+  | o   rank=2
+  | |
+  o |  b rank=2
+  |/
+  o  a rank=1
+  
+
+Display the sort of "d" for reference:
+
+  $ hg test-sts d
+  d,b,c,*,a, (no-eol) (glob)
+
+Check that we leap from "b" directly to "e" (shadowing the leap to "c"),
+and that "c" is then emitted after "e" (its descendant).
+
+  $ hg test-sts f
+  f,d,b,e,*,c,*,a, (no-eol) (glob)
+
+  $ cd ..
+
+
+Example 4: skipping over nested exclusive part (entirely)
+=========================================================
+
+We have a merge "f" whose exclusive part contains a merge "d".
+
+The exclusive part of "d" is not in the exclusive part of "f".
+However, some of the inherited part of "d" is part of the exclusive part of "f"
+and needs to be iterated over before leaping to the inherited part of "f".
+
+The sort of "d" is partially reused for the ordering of the exclusive part of
+"f". However the reused part is not contiguous in the sort of "d".
+
+#           f
+#           |
+#        ---<---
+#        |     |
+#        d     |
+#        |     e
+#      -->--   |    <- in the sort of "f", we need to skip "c" and leap to the
+#      |   |   |       inherited part of "d"
+#      |   +----
+#      b   |
+#      |   c
+#      |   |
+#      --+--
+#        |
+#        a
+
+  $ hg init example-4
+  $ cd example-4
+  $ hg debugbuilddag '.:a*a+1:b<a+1:c*b/c:d<c+4:e*d/e:f.'
+  $ hg test-log
+  o  tip rank=11
+  |
+  o    f rank=10
+  |\
+  | o  e rank=6
+  | |
+  | o   rank=5
+  | |
+  | o   rank=4
+  | |
+  | o   rank=3
+  | |
+  o |  d rank=5
+  |\|
+  | o  c rank=2
+  | |
+  o |  b rank=3
+  | |
+  o |   rank=2
+  |/
+  o  a rank=1
+  
+
+Display the sort of "d" for reference:
+
+  $ hg test-sts d
+  d,c,b,*,a, (no-eol) (glob)
+
+Chack that sort "f" leaps from "d" to "b":
+
+  $ hg test-sts f
+  f,d,b,*,e,*,c,a, (no-eol) (glob)
+
+  $ cd ..
+
+
+Example 5: skipping over nested exclusive part (partially)
+==========================================================
+
+We have a merge "f" whose exclusive part contains a merge "d".
+
+Similar to example 4, but the exclusive part of "d" is only partially
+contained in the inherited part of "f".
+So, we need to leap in the middle of the exclusive part of "d".
+
+#           f
+#           |
+#        ---<---
+#        |     |
+#        d     |
+#        |     e
+#      -->--   |
+#      |   |   |
+#      |   g   |
+#      |   |   |
+#      |   +----    <- in the sort of "f", leaping from "g" to "b"
+#      b   |
+#      |   c
+#      |   |
+#      --+--
+#        |
+#        a
+
+  $ hg init example-5
+  $ cd example-5
+  $ hg debugbuilddag '.:a*a+2:b<a+1:c+1:g*b/g:d<c+6:e*d/e:f.'
+  $ hg test-log
+  o  tip rank=15
+  |
+  o    f rank=14
+  |\
+  | o  e rank=8
+  | |
+  | o   rank=7
+  | |
+  | o   rank=6
+  | |
+  | o   rank=5
+  | |
+  | o   rank=4
+  | |
+  | o   rank=3
+  | |
+  o |    d rank=7
+  |\ \
+  | o |  g rank=3
+  | |/
+  | o  c rank=2
+  | |
+  o |  b rank=4
+  | |
+  o |   rank=3
+  | |
+  o |   rank=2
+  |/
+  o  a rank=1
+  
+
+Display the sort of "d" for reference:
+
+  $ hg test-sts d
+  d,g,c,b,*,a, (no-eol) (glob)
+
+Check that sort "f" leaps from "g" to "b":
+
+  $ hg test-sts f
+  f,d,g,b,*,e,*,c,a, (no-eol) (glob)
+
+  $ cd ..
+
+
+Example 6: merge in the inherited part
+======================================
+
+Variant of example 2, but with a merge ("f") in the inherited part of "g".
+
+"g" is a merge node whose inherited part contains a merge node "f".
+We check that the stable-tail sort delegates properly after the exclusive part.
+
+#         g
+#         |
+#      ---<---
+#      |     |
+#      d     f
+#      |     |
+#      |  ---<---
+#      |  |     |
+#      |  e     c
+#      |  |     |
+#      ---+     |    <- at this point, we're done (for good) with the exclusive
+#         |     |       part of "g"
+#         b     |
+#         |     |
+#         ---+---
+#            |
+#            a
+
+  $ hg init example-6
+  $ cd example-6
+  $ hg debugbuilddag '.:a*a:b<a+3:c*b:d*b:e*e/c:f*d/f:g.'
+  $ hg test-log
+  o  tip rank=10
+  |
+  o    g rank=9
+  |\
+  | o    f rank=7
+  | |\
+  | | o  e rank=3
+  | | |
+  o---+  d rank=3
+   / /
+  o |  c rank=4
+  | |
+  o |   rank=3
+  | |
+  o |   rank=2
+  | |
+  | o  b rank=2
+  |/
+  o  a rank=1
+  
+
+Display the sort of "f" for reference:
+
+  $ hg test-sts f
+  f,e,b,c,*,a, (no-eol) (glob)
+
+Check that the sort of "g" delegates to the sort of "f" after processing its
+exclusive part of "g":
+
+  $ hg test-sts g
+  g,d,f,e,b,c,*,a, (no-eol) (glob)
+
+  $ cd ..
+
+
+Example 7: postponed iteration of common exclusive ancestors
+============================================================
+
+Sibling merges "j" and "k", with partially shared exclusive parts.
+
+When considering the sort of "l", the iteration over this shared part cannot
+happen when iterating over excl(j) and has to be postponed to excl(k).
+
+#            l
+#            |
+#        ----<----
+#        |       |
+#        j       k
+#        |       |
+#      -->--   --<--
+#      |   |   |   |
+#      g   e   h   i
+#      |   |   |   |
+#      |   --+--   |   <- at this point, for the sort of "l", the iteration on
+#      f     |     |      the end of excl(j) is postponed to the iteration of
+#      |     d     |      excl(k)
+#      |     |     |
+#      |     c     |
+#      |     |     |
+#      ---+---     |
+#         |        |
+#         b        |
+#         |        |
+#         ----+-----
+#             |
+#             a
+
+  $ hg init example-7
+  $ cd example-7
+  $ hg debugbuilddag \
+  > '.:a*a:b*b:c*c:d*d:e*b:f<f+3:g<d+2:h<a+6:i*e/g:j*h/i:k*j/k:l.'
+  $ hg test-log
+  o  tip rank=21
+  |
+  o    l rank=20
+  |\
+  | o    k rank=13
+  | |\
+  o \ \    j rank=10
+  |\ \ \
+  | | | o  i rank=7
+  | | | |
+  | | | o   rank=6
+  | | | |
+  | | | o   rank=5
+  | | | |
+  | | | o   rank=4
+  | | | |
+  | | | o   rank=3
+  | | | |
+  | | | o   rank=2
+  | | | |
+  | | o |  h rank=6
+  | | | |
+  | | o |   rank=5
+  | | | |
+  | o | |  g rank=6
+  | | | |
+  | o | |   rank=5
+  | | | |
+  | o | |   rank=4
+  | | | |
+  | o | |  f rank=3
+  | | | |
+  o---+ |  e rank=5
+   / / /
+  | o |  d rank=4
+  | | |
+  | o |  c rank=3
+  |/ /
+  o /  b rank=2
+  |/
+  o  a rank=1
+  
+
+Display the sort of "j" for reference:
+
+  $ hg test-sts j
+  j,e,d,c,g,*,f,b,a, (no-eol) (glob)
+
+Display the sort of "k" for reference:
+
+  $ hg test-sts k
+  k,h,*,d,c,b,i,*,a, (no-eol) (glob)
+
+Check that the common part of excl(j) and excl(k) is iterated over after "k":
+
+  $ hg test-sts l
+  l,j,e,g,*,f,k,h,*,d,c,b,i,*,a, (no-eol) (glob)
+
+  $ cd ..
+
+
+Example 8: postponed iteration of common ancestors between parts
+================================================================
+
+Sibling merges "g" and "i", with some part shared between the inherited part
+of "g" and the exclusive part of "i".
+
+When considering the sort of "j", the iteration over this shared part cannot
+happen when iterating over inherited(g) and has to be postponed to excl(i).
+
+#            j
+#            |
+#        ----<----
+#        |       |
+#        g       i
+#        |       |
+#      --<--   --<--
+#      |   |   |   |
+#      c   f   |   h
+#      |   |   |   |
+#      |   --+--   |   <- at this point, for the sort of "j", the iteration
+#      |     |     |      on the end of inherited(g) is postponed to the
+#      |     e     |      iteration of excl(k)
+#      |     |     |
+#      ---+---     |
+#         b        |
+#         |        |
+#         ----+-----
+#             |
+#             a
+
+  $ hg init example-8
+  $ cd example-8
+  $ hg debugbuilddag '.:a*a:b*b:c*b:d*d:e*e:f*c/f:g<a+5:h*e/h:i*g/i:j.'
+  $ hg test-log
+  o  tip rank=15
+  |
+  o    j rank=14
+  |\
+  | o    i rank=10
+  | |\
+  | | o  h rank=6
+  | | |
+  | | o   rank=5
+  | | |
+  | | o   rank=4
+  | | |
+  | | o   rank=3
+  | | |
+  | | o   rank=2
+  | | |
+  o | |    g rank=7
+  |\ \ \
+  | o | |  f rank=5
+  | |/ /
+  | o |  e rank=4
+  | | |
+  | o |  d rank=3
+  | | |
+  o | |  c rank=3
+  |/ /
+  o /  b rank=2
+  |/
+  o  a rank=1
+  
+
+Display the sort of "g" for reference:
+
+  $ hg test-sts g
+  g,c,f,e,d,b,a, (no-eol)
+
+Display the sort of "i" for reference:
+
+  $ hg test-sts i
+  i,e,d,b,h,*,a, (no-eol) (glob)
+
+Check that the common part of inherited(g) and excl(k) is iterated over after
+"i":
+
+  $ hg test-sts j
+  j,g,c,f,i,e,d,b,h,*,a, (no-eol) (glob)
+
+  $ cd ..
+
+
+Example 9: postponed iteration of common ancestors between both parts
+=====================================================================
+
+This is a combination of example 7 and 8 at the same time.
+Both excl(i) and excl(j) share a common part.
+Same with inherited(i) and inherited(j).
+
+We test that the walk on the common ancestors in both cases is properly
+postponed when considering sort(k).
+
+#            k
+#            |
+#        ----<----
+#        |       |
+#        i       j
+#        |       |
+#      --<--   --<--
+#      |   |   |   |
+#      c   f   g   h
+#      |   |   |   |
+#      |   e   |   |
+#      |   |   |   |
+#      +--]|[---   |   <- rest of excl(i) postponed to excl(j)
+#      |   |       |
+#      b   ----+----   <- rest of inherited(i) postponed to inherited(j)
+#      |       |
+#      |       d
+#      |       |
+#      ----+----
+#          |
+#          a
+
+  $ hg init example-9
+  $ cd example-9
+  $ hg debugbuilddag '.:a*a:b*b:c*a:d*d:e*e:f<b+2:g<d+3:h*c/f:i*g/h:j*i/j:k.'
+  $ hg test-log
+  o  tip rank=15
+  |
+  o    k rank=14
+  |\
+  | o    j rank=9
+  | |\
+  o \ \    i rank=7
+  |\ \ \
+  | | | o  h rank=5
+  | | | |
+  | | | o   rank=4
+  | | | |
+  | | | o   rank=3
+  | | | |
+  | | o |  g rank=4
+  | | | |
+  | | o |   rank=3
+  | | | |
+  | o | |  f rank=4
+  | | | |
+  | o---+  e rank=3
+  |  / /
+  | | o  d rank=2
+  | | |
+  o | |  c rank=3
+  |/ /
+  o /  b rank=2
+  |/
+  o  a rank=1
+  
+
+Display sort(i) for reference:
+
+  $ hg test-sts i
+  i,c,b,f,e,d,a, (no-eol)
+
+Display sort(j) for reference:
+
+  $ hg test-sts j
+  j,g,*,b,h,*,d,a, (no-eol) (glob)
+
+Check that the end of excl(i) is postponed to excl(j), the end of inherited(i)
+is postponed to inherited(j) in sort(k):
+
+  $ hg test-sts k
+  k,i,c,f,e,j,g,*,b,h,*,d,a, (no-eol) (glob)
+
+  $ cd ..

mercurial/debugcommands.py

@@ -1,4783 +1,4808 b''
 # debugcommands.py - command processing for debug* commands
 #
 # Copyright 2005-2016 Olivia Mackall <[e-mail]>
 #
 # This software may be used and distributed according to the terms of the
 # GNU General Public License version 2 or any later version.
 
 
 import binascii
 import codecs
 import collections
 import contextlib
 import difflib
 import errno
 import glob
 import operator
 import os
 import platform
 import random
 import re
 import socket
 import ssl
 import stat
 import subprocess
 import sys
 import time
 
 from .i18n import _
 from .node import (
     bin,
     hex,
     nullrev,
     short,
 )
 from .pycompat import (
     getattr,
     open,
 )
 from . import (
     bundle2,
     bundlerepo,
     changegroup,
     cmdutil,
     color,
     context,
     copies,
     dagparser,
     dirstateutils,
     encoding,
     error,
     exchange,
     extensions,
     filemerge,
     filesetlang,
     formatter,
     hg,
     httppeer,
     localrepo,
     lock as lockmod,
     logcmdutil,
     mergestate as mergestatemod,
     metadata,
     obsolete,
     obsutil,
     pathutil,
     phases,
     policy,
     pvec,
     pycompat,
     registrar,
     repair,
     repoview,
     requirements,
     revlog,
     revset,
     revsetlang,
     scmutil,
     setdiscovery,
     simplemerge,
     sshpeer,
     sslutil,
     streamclone,
     strip,
     tags as tagsmod,
     templater,
     treediscovery,
     upgrade,
     url as urlmod,
     util,
     verify,
     vfs as vfsmod,
     wireprotoframing,
     wireprotoserver,
 )
 from .interfaces import repository
+from .stabletailgraph import stabletailsort
 from .utils import (
     cborutil,
     compression,
     dateutil,
     procutil,
     stringutil,
     urlutil,
 )
 
 from .revlogutils import (
     constants as revlog_constants,
     debug as revlog_debug,
     deltas as deltautil,
     nodemap,
     rewrite,
     sidedata,
 )
 
 release = lockmod.release
 
 table = {}
 table.update(strip.command._table)
 command = registrar.command(table)
 
 
 @command(b'debugancestor', [], _(b'[INDEX] REV1 REV2'), optionalrepo=True)
 def debugancestor(ui, repo, *args):
     """find the ancestor revision of two revisions in a given index"""
     if len(args) == 3:
         index, rev1, rev2 = args
         r = revlog.revlog(vfsmod.vfs(encoding.getcwd(), audit=False), index)
         lookup = r.lookup
     elif len(args) == 2:
         if not repo:
             raise error.Abort(
                 _(b'there is no Mercurial repository here (.hg not found)')
             )
         rev1, rev2 = args
         r = repo.changelog
         lookup = repo.lookup
     else:
         raise error.Abort(_(b'either two or three arguments required'))
     a = r.ancestor(lookup(rev1), lookup(rev2))
     ui.write(b'%d:%s\n' % (r.rev(a), hex(a)))
 
 
 @command(b'debugantivirusrunning', [])
 def debugantivirusrunning(ui, repo):
     """attempt to trigger an antivirus scanner to see if one is active"""
     with repo.cachevfs.open('eicar-test-file.com', b'wb') as f:
         f.write(
             util.b85decode(
                 # This is a base85-armored version of the EICAR test file. See
                 # https://en.wikipedia.org/wiki/EICAR_test_file for details.
                 b'ST#=}P$fV?P+K%yP+C|uG$>GBDK|qyDK~v2MM*<JQY}+dK~6+LQba95P'
                 b'E<)&Nm5l)EmTEQR4qnHOhq9iNGnJx'
             )
         )
     # Give an AV engine time to scan the file.
     time.sleep(2)
     util.unlink(repo.cachevfs.join('eicar-test-file.com'))
 
 
 @command(b'debugapplystreamclonebundle', [], b'FILE')
 def debugapplystreamclonebundle(ui, repo, fname):
     """apply a stream clone bundle file"""
     f = hg.openpath(ui, fname)
     gen = exchange.readbundle(ui, f, fname)
     gen.apply(repo)
 
 
 @command(
     b'debugbuilddag',
     [
         (
             b'm',
             b'mergeable-file',
             None,
             _(b'add single file mergeable changes'),
         ),
         (
             b'o',
             b'overwritten-file',
             None,
             _(b'add single file all revs overwrite'),
         ),
         (b'n', b'new-file', None, _(b'add new file at each rev')),
         (
             b'',
             b'from-existing',
             None,
             _(b'continue from a non-empty repository'),
         ),
     ],
     _(b'[OPTION]... [TEXT]'),
 )
 def debugbuilddag(
     ui,
     repo,
     text=None,
     mergeable_file=False,
     overwritten_file=False,
     new_file=False,
     from_existing=False,
 ):
     """builds a repo with a given DAG from scratch in the current empty repo
 
     The description of the DAG is read from stdin if not given on the
     command line.
 
     Elements:
 
      - "+n" is a linear run of n nodes based on the current default parent
      - "." is a single node based on the current default parent
      - "$" resets the default parent to null (implied at the start);
            otherwise the default parent is always the last node created
      - "<p" sets the default parent to the backref p
      - "*p" is a fork at parent p, which is a backref
      - "*p1/p2" is a merge of parents p1 and p2, which are backrefs
      - "/p2" is a merge of the preceding node and p2
      - ":tag" defines a local tag for the preceding node
      - "@branch" sets the named branch for subsequent nodes
      - "#...\\n" is a comment up to the end of the line
 
     Whitespace between the above elements is ignored.
 
     A backref is either
 
      - a number n, which references the node curr-n, where curr is the current
        node, or
      - the name of a local tag you placed earlier using ":tag", or
      - empty to denote the default parent.
 
     All string valued-elements are either strictly alphanumeric, or must
     be enclosed in double quotes ("..."), with "\\" as escape character.
     """
 
     if text is None:
         ui.status(_(b"reading DAG from stdin\n"))
         text = ui.fin.read()
 
     cl = repo.changelog
     if len(cl) > 0 and not from_existing:
         raise error.Abort(_(b'repository is not empty'))
 
     # determine number of revs in DAG
     total = 0
     for type, data in dagparser.parsedag(text):
         if type == b'n':
             total += 1
 
     if mergeable_file:
         linesperrev = 2
         # make a file with k lines per rev
         initialmergedlines = [b'%d' % i for i in range(0, total * linesperrev)]
         initialmergedlines.append(b"")
 
     tags = []
     progress = ui.makeprogress(
         _(b'building'), unit=_(b'revisions'), total=total
     )
     with progress, repo.wlock(), repo.lock(), repo.transaction(b"builddag"):
         at = -1
         atbranch = b'default'
         nodeids = []
         id = 0
         progress.update(id)
         for type, data in dagparser.parsedag(text):
             if type == b'n':
                 ui.note((b'node %s\n' % pycompat.bytestr(data)))
                 id, ps = data
 
                 files = []
                 filecontent = {}
 
                 p2 = None
                 if mergeable_file:
                     fn = b"mf"
                     p1 = repo[ps[0]]
                     if len(ps) > 1:
                         p2 = repo[ps[1]]
                         pa = p1.ancestor(p2)
                         base, local, other = [
                             x[fn].data() for x in (pa, p1, p2)
                         ]
                         m3 = simplemerge.Merge3Text(base, local, other)
                         ml = [
                             l.strip()
                             for l in simplemerge.render_minimized(m3)[0]
                         ]
                         ml.append(b"")
                     elif at > 0:
                         ml = p1[fn].data().split(b"\n")
                     else:
                         ml = initialmergedlines
                     ml[id * linesperrev] += b" r%i" % id
                     mergedtext = b"\n".join(ml)
                     files.append(fn)
                     filecontent[fn] = mergedtext
 
                 if overwritten_file:
                     fn = b"of"
                     files.append(fn)
                     filecontent[fn] = b"r%i\n" % id
 
                 if new_file:
                     fn = b"nf%i" % id
                     files.append(fn)
                     filecontent[fn] = b"r%i\n" % id
                     if len(ps) > 1:
                         if not p2:
                             p2 = repo[ps[1]]
                         for fn in p2:
                             if fn.startswith(b"nf"):
                                 files.append(fn)
                                 filecontent[fn] = p2[fn].data()
 
                 def fctxfn(repo, cx, path):
                     if path in filecontent:
                         return context.memfilectx(
                             repo, cx, path, filecontent[path]
                         )
                     return None
 
                 if len(ps) == 0 or ps[0] < 0:
                     pars = [None, None]
                 elif len(ps) == 1:
                     pars = [nodeids[ps[0]], None]
                 else:
                     pars = [nodeids[p] for p in ps]
                 cx = context.memctx(
                     repo,
                     pars,
                     b"r%i" % id,
                     files,
                     fctxfn,
                     date=(id, 0),
                     user=b"debugbuilddag",
                     extra={b'branch': atbranch},
                 )
                 nodeid = repo.commitctx(cx)
                 nodeids.append(nodeid)
                 at = id
             elif type == b'l':
                 id, name = data
                 ui.note((b'tag %s\n' % name))
                 tags.append(b"%s %s\n" % (hex(repo.changelog.node(id)), name))
             elif type == b'a':
                 ui.note((b'branch %s\n' % data))
                 atbranch = data
             progress.update(id)
 
         if tags:
             repo.vfs.write(b"localtags", b"".join(tags))
 
 
 def _debugchangegroup(ui, gen, all=None, indent=0, **opts):
     indent_string = b' ' * indent
     if all:
         ui.writenoi18n(
             b"%sformat: id, p1, p2, cset, delta base, len(delta)\n"
             % indent_string
         )
 
         def showchunks(named):
             ui.write(b"\n%s%s\n" % (indent_string, named))
             for deltadata in gen.deltaiter():
                 node, p1, p2, cs, deltabase, delta, flags, sidedata = deltadata
                 ui.write(
                     b"%s%s %s %s %s %s %d\n"
                     % (
                         indent_string,
                         hex(node),
                         hex(p1),
                         hex(p2),
                         hex(cs),
                         hex(deltabase),
                         len(delta),
                     )
                 )
 
         gen.changelogheader()
         showchunks(b"changelog")
         gen.manifestheader()
         showchunks(b"manifest")
         for chunkdata in iter(gen.filelogheader, {}):
             fname = chunkdata[b'filename']
             showchunks(fname)
     else:
         if isinstance(gen, bundle2.unbundle20):
             raise error.Abort(_(b'use debugbundle2 for this file'))
         gen.changelogheader()
         for deltadata in gen.deltaiter():
             node, p1, p2, cs, deltabase, delta, flags, sidedata = deltadata
             ui.write(b"%s%s\n" % (indent_string, hex(node)))
 
 
 def _debugobsmarkers(ui, part, indent=0, **opts):
     """display version and markers contained in 'data'"""
     opts = pycompat.byteskwargs(opts)
     data = part.read()
     indent_string = b' ' * indent
     try:
         version, markers = obsolete._readmarkers(data)
     except error.UnknownVersion as exc:
         msg = b"%sunsupported version: %s (%d bytes)\n"
         msg %= indent_string, exc.version, len(data)
         ui.write(msg)
     else:
         msg = b"%sversion: %d (%d bytes)\n"
         msg %= indent_string, version, len(data)
         ui.write(msg)
         fm = ui.formatter(b'debugobsolete', opts)
         for rawmarker in sorted(markers):
             m = obsutil.marker(None, rawmarker)
             fm.startitem()
             fm.plain(indent_string)
             cmdutil.showmarker(fm, m)
         fm.end()
 
 
 def _debugphaseheads(ui, data, indent=0):
     """display version and markers contained in 'data'"""
     indent_string = b' ' * indent
     headsbyphase = phases.binarydecode(data)
     for phase in phases.allphases:
         for head in headsbyphase[phase]:
             ui.write(indent_string)
             ui.write(b'%s %s\n' % (hex(head), phases.phasenames[phase]))
 
 
 def _quasirepr(thing):
     if isinstance(thing, (dict, util.sortdict, collections.OrderedDict)):
         return b'{%s}' % (
             b', '.join(b'%s: %s' % (k, thing[k]) for k in sorted(thing))
         )
     return pycompat.bytestr(repr(thing))
 
 
 def _debugbundle2(ui, gen, all=None, **opts):
     """lists the contents of a bundle2"""
     if not isinstance(gen, bundle2.unbundle20):
         raise error.Abort(_(b'not a bundle2 file'))
     ui.write((b'Stream params: %s\n' % _quasirepr(gen.params)))
     parttypes = opts.get('part_type', [])
     for part in gen.iterparts():
         if parttypes and part.type not in parttypes:
             continue
         msg = b'%s -- %s (mandatory: %r)\n'
         ui.write((msg % (part.type, _quasirepr(part.params), part.mandatory)))
         if part.type == b'changegroup':
             version = part.params.get(b'version', b'01')
             cg = changegroup.getunbundler(version, part, b'UN')
             if not ui.quiet:
                 _debugchangegroup(ui, cg, all=all, indent=4, **opts)
         if part.type == b'obsmarkers':
             if not ui.quiet:
                 _debugobsmarkers(ui, part, indent=4, **opts)
         if part.type == b'phase-heads':
             if not ui.quiet:
                 _debugphaseheads(ui, part, indent=4)
 
 
 @command(
     b'debugbundle',
     [
         (b'a', b'all', None, _(b'show all details')),
         (b'', b'part-type', [], _(b'show only the named part type')),
         (b'', b'spec', None, _(b'print the bundlespec of the bundle')),
     ],
     _(b'FILE'),
     norepo=True,
 )
 def debugbundle(ui, bundlepath, all=None, spec=None, **opts):
     """lists the contents of a bundle"""
     with hg.openpath(ui, bundlepath) as f:
         if spec:
             spec = exchange.getbundlespec(ui, f)
             ui.write(b'%s\n' % spec)
             return
 
         gen = exchange.readbundle(ui, f, bundlepath)
         if isinstance(gen, bundle2.unbundle20):
             return _debugbundle2(ui, gen, all=all, **opts)
         _debugchangegroup(ui, gen, all=all, **opts)
 
 
 @command(b'debugcapabilities', [], _(b'PATH'), norepo=True)
 def debugcapabilities(ui, path, **opts):
     """lists the capabilities of a remote peer"""
     opts = pycompat.byteskwargs(opts)
     peer = hg.peer(ui, opts, path)
     try:
         caps = peer.capabilities()
         ui.writenoi18n(b'Main capabilities:\n')
         for c in sorted(caps):
             ui.write(b'  %s\n' % c)
         b2caps = bundle2.bundle2caps(peer)
         if b2caps:
             ui.writenoi18n(b'Bundle2 capabilities:\n')
             for key, values in sorted(b2caps.items()):
                 ui.write(b'  %s\n' % key)
                 for v in values:
                     ui.write(b'    %s\n' % v)
     finally:
         peer.close()
 
 
 @command(
     b'debugchangedfiles',
     [
         (
             b'',
             b'compute',
             False,
             b"compute information instead of reading it from storage",
         ),
     ],
     b'REV',
 )
 def debugchangedfiles(ui, repo, rev, **opts):
     """list the stored files changes for a revision"""
     ctx = logcmdutil.revsingle(repo, rev, None)
     files = None
 
     if opts['compute']:
         files = metadata.compute_all_files_changes(ctx)
     else:
         sd = repo.changelog.sidedata(ctx.rev())
         files_block = sd.get(sidedata.SD_FILES)
         if files_block is not None:
             files = metadata.decode_files_sidedata(sd)
     if files is not None:
         for f in sorted(files.touched):
             if f in files.added:
                 action = b"added"
             elif f in files.removed:
                 action = b"removed"
             elif f in files.merged:
                 action = b"merged"
             elif f in files.salvaged:
                 action = b"salvaged"
             else:
                 action = b"touched"
 
             copy_parent = b""
             copy_source = b""
             if f in files.copied_from_p1:
                 copy_parent = b"p1"
                 copy_source = files.copied_from_p1[f]
             elif f in files.copied_from_p2:
                 copy_parent = b"p2"
                 copy_source = files.copied_from_p2[f]
 
             data = (action, copy_parent, f, copy_source)
             template = b"%-8s %2s: %s, %s;\n"
             ui.write(template % data)
 
 
 @command(b'debugcheckstate', [], b'')
 def debugcheckstate(ui, repo):
     """validate the correctness of the current dirstate"""
     errors = verify.verifier(repo)._verify_dirstate()
     if errors:
         errstr = _(b"dirstate inconsistent with current parent's manifest")
         raise error.Abort(errstr)
 
 
 @command(
     b'debugcolor',
     [(b'', b'style', None, _(b'show all configured styles'))],
     b'hg debugcolor',
 )
 def debugcolor(ui, repo, **opts):
     """show available color, effects or style"""
     ui.writenoi18n(b'color mode: %s\n' % stringutil.pprint(ui._colormode))
     if opts.get('style'):
         return _debugdisplaystyle(ui)
     else:
         return _debugdisplaycolor(ui)
 
 
 def _debugdisplaycolor(ui):
     ui = ui.copy()
     ui._styles.clear()
     for effect in color._activeeffects(ui).keys():
         ui._styles[effect] = effect
     if ui._terminfoparams:
         for k, v in ui.configitems(b'color'):
             if k.startswith(b'color.'):
                 ui._styles[k] = k[6:]
             elif k.startswith(b'terminfo.'):
                 ui._styles[k] = k[9:]
     ui.write(_(b'available colors:\n'))
     # sort label with a '_' after the other to group '_background' entry.
     items = sorted(ui._styles.items(), key=lambda i: (b'_' in i[0], i[0], i[1]))
     for colorname, label in items:
         ui.write(b'%s\n' % colorname, label=label)
 
 
 def _debugdisplaystyle(ui):
     ui.write(_(b'available style:\n'))
     if not ui._styles:
         return
     width = max(len(s) for s in ui._styles)
     for label, effects in sorted(ui._styles.items()):
         ui.write(b'%s' % label, label=label)
         if effects:
             # 50
             ui.write(b': ')
             ui.write(b' ' * (max(0, width - len(label))))
             ui.write(b', '.join(ui.label(e, e) for e in effects.split()))
         ui.write(b'\n')
 
 
 @command(b'debugcreatestreamclonebundle', [], b'FILE')
 def debugcreatestreamclonebundle(ui, repo, fname):
     """create a stream clone bundle file
 
     Stream bundles are special bundles that are essentially archives of
     revlog files. They are commonly used for cloning very quickly.
     """
     # TODO we may want to turn this into an abort when this functionality
     # is moved into `hg bundle`.
     if phases.hassecret(repo):
         ui.warn(
             _(
                 b'(warning: stream clone bundle will contain secret '
                 b'revisions)\n'
             )
         )
 
     requirements, gen = streamclone.generatebundlev1(repo)
     changegroup.writechunks(ui, gen, fname)
 
     ui.write(_(b'bundle requirements: %s\n') % b', '.join(sorted(requirements)))
 
 
 @command(
     b'debugdag',
     [
         (b't', b'tags', None, _(b'use tags as labels')),
         (b'b', b'branches', None, _(b'annotate with branch names')),
         (b'', b'dots', None, _(b'use dots for runs')),
         (b's', b'spaces', None, _(b'separate elements by spaces')),
     ],
     _(b'[OPTION]... [FILE [REV]...]'),
     optionalrepo=True,
 )
 def debugdag(ui, repo, file_=None, *revs, **opts):
     """format the changelog or an index DAG as a concise textual description
 
     If you pass a revlog index, the revlog's DAG is emitted. If you list
     revision numbers, they get labeled in the output as rN.
 
     Otherwise, the changelog DAG of the current repo is emitted.
     """
     spaces = opts.get('spaces')
     dots = opts.get('dots')
     if file_:
         rlog = revlog.revlog(vfsmod.vfs(encoding.getcwd(), audit=False), file_)
         revs = {int(r) for r in revs}
 
         def events():
             for r in rlog:
                 yield b'n', (r, list(p for p in rlog.parentrevs(r) if p != -1))
                 if r in revs:
                     yield b'l', (r, b"r%i" % r)
 
     elif repo:
         cl = repo.changelog
         tags = opts.get('tags')
         branches = opts.get('branches')
         if tags:
             labels = {}
             for l, n in repo.tags().items():
                 labels.setdefault(cl.rev(n), []).append(l)
 
         def events():
             b = b"default"
             for r in cl:
                 if branches:
                     newb = cl.read(cl.node(r))[5][b'branch']
                     if newb != b:
                         yield b'a', newb
                         b = newb
                 yield b'n', (r, list(p for p in cl.parentrevs(r) if p != -1))
                 if tags:
                     ls = labels.get(r)
                     if ls:
                         for l in ls:
                             yield b'l', (r, l)
 
     else:
         raise error.Abort(_(b'need repo for changelog dag'))
 
     for line in dagparser.dagtextlines(
         events(),
         addspaces=spaces,
         wraplabels=True,
         wrapannotations=True,
         wrapnonlinear=dots,
         usedots=dots,
         maxlinewidth=70,
     ):
         ui.write(line)
         ui.write(b"\n")
 
 
 @command(b'debugdata', cmdutil.debugrevlogopts, _(b'-c|-m|FILE REV'))
 def debugdata(ui, repo, file_, rev=None, **opts):
     """dump the contents of a data file revision"""
     opts = pycompat.byteskwargs(opts)
     if opts.get(b'changelog') or opts.get(b'manifest') or opts.get(b'dir'):
         if rev is not None:
             raise error.CommandError(b'debugdata', _(b'invalid arguments'))
         file_, rev = None, file_
     elif rev is None:
         raise error.CommandError(b'debugdata', _(b'invalid arguments'))
     r = cmdutil.openstorage(repo, b'debugdata', file_, opts)
     try:
         ui.write(r.rawdata(r.lookup(rev)))
     except KeyError:
         raise error.Abort(_(b'invalid revision identifier %s') % rev)
 
 
 @command(
     b'debugdate',
     [(b'e', b'extended', None, _(b'try extended date formats'))],
     _(b'[-e] DATE [RANGE]'),
     norepo=True,
     optionalrepo=True,
 )
 def debugdate(ui, date, range=None, **opts):
     """parse and display a date"""
     if opts["extended"]:
         d = dateutil.parsedate(date, dateutil.extendeddateformats)
     else:
         d = dateutil.parsedate(date)
     ui.writenoi18n(b"internal: %d %d\n" % d)
     ui.writenoi18n(b"standard: %s\n" % dateutil.datestr(d))
     if range:
         m = dateutil.matchdate(range)
         ui.writenoi18n(b"match: %s\n" % m(d[0]))
 
 
 @command(
     b'debugdeltachain',
     cmdutil.debugrevlogopts + cmdutil.formatteropts,
     _(b'-c|-m|FILE'),
     optionalrepo=True,
 )
 def debugdeltachain(ui, repo, file_=None, **opts):
     """dump information about delta chains in a revlog
 
     Output can be templatized. Available template keywords are:
 
     :``rev``:       revision number
     :``p1``:        parent 1 revision number (for reference)
     :``p2``:        parent 2 revision number (for reference)
     :``chainid``:   delta chain identifier (numbered by unique base)
     :``chainlen``:  delta chain length to this revision
     :``prevrev``:   previous revision in delta chain
     :``deltatype``: role of delta / how it was computed
                     - base:  a full snapshot
                     - snap:  an intermediate snapshot
                     - p1:    a delta against the first parent
                     - p2:    a delta against the second parent
                     - skip1: a delta against the same base as p1
                               (when p1 has empty delta
                     - skip2: a delta against the same base as p2
                               (when p2 has empty delta
                     - prev:  a delta against the previous revision
                     - other: a delta against an arbitrary revision
     :``compsize``:  compressed size of revision
     :``uncompsize``: uncompressed size of revision
     :``chainsize``: total size of compressed revisions in chain
     :``chainratio``: total chain size divided by uncompressed revision size
                     (new delta chains typically start at ratio 2.00)
     :``lindist``:   linear distance from base revision in delta chain to end
                     of this revision
     :``extradist``: total size of revisions not part of this delta chain from
                     base of delta chain to end of this revision; a measurement
                     of how much extra data we need to read/seek across to read
                     the delta chain for this revision
     :``extraratio``: extradist divided by chainsize; another representation of
                     how much unrelated data is needed to load this delta chain
 
     If the repository is configured to use the sparse read, additional keywords
     are available:
 
     :``readsize``:     total size of data read from the disk for a revision
                        (sum of the sizes of all the blocks)
     :``largestblock``: size of the largest block of data read from the disk
     :``readdensity``:  density of useful bytes in the data read from the disk
     :``srchunks``:  in how many data hunks the whole revision would be read
 
     The sparse read can be enabled with experimental.sparse-read = True
     """
     opts = pycompat.byteskwargs(opts)
     r = cmdutil.openrevlog(repo, b'debugdeltachain', file_, opts)
     index = r.index
     start = r.start
     length = r.length
     generaldelta = r._generaldelta
     withsparseread = getattr(r, '_withsparseread', False)
 
     # security to avoid crash on corrupted revlogs
     total_revs = len(index)
 
     chain_size_cache = {}
 
     def revinfo(rev):
         e = index[rev]
         compsize = e[revlog_constants.ENTRY_DATA_COMPRESSED_LENGTH]
         uncompsize = e[revlog_constants.ENTRY_DATA_UNCOMPRESSED_LENGTH]
 
         base = e[revlog_constants.ENTRY_DELTA_BASE]
         p1 = e[revlog_constants.ENTRY_PARENT_1]
         p2 = e[revlog_constants.ENTRY_PARENT_2]
 
         # If the parents of a revision has an empty delta, we never try to delta
         # against that parent, but directly against the delta base of that
         # parent (recursively). It avoids adding a useless entry in the chain.
         #
         # However we need to detect that as a special case for delta-type, that
         # is not simply "other".
         p1_base = p1
         if p1 != nullrev and p1 < total_revs:
             e1 = index[p1]
             while e1[revlog_constants.ENTRY_DATA_COMPRESSED_LENGTH] == 0:
                 new_base = e1[revlog_constants.ENTRY_DELTA_BASE]
                 if (
                     new_base == p1_base
                     or new_base == nullrev
                     or new_base >= total_revs
                 ):
                     break
                 p1_base = new_base
                 e1 = index[p1_base]
         p2_base = p2
         if p2 != nullrev and p2 < total_revs:
             e2 = index[p2]
             while e2[revlog_constants.ENTRY_DATA_COMPRESSED_LENGTH] == 0:
                 new_base = e2[revlog_constants.ENTRY_DELTA_BASE]
                 if (
                     new_base == p2_base
                     or new_base == nullrev
                     or new_base >= total_revs
                 ):
                     break
                 p2_base = new_base
                 e2 = index[p2_base]
 
         if generaldelta:
             if base == p1:
                 deltatype = b'p1'
             elif base == p2:
                 deltatype = b'p2'
             elif base == rev:
                 deltatype = b'base'
             elif base == p1_base:
                 deltatype = b'skip1'
             elif base == p2_base:
                 deltatype = b'skip2'
             elif r.issnapshot(rev):
                 deltatype = b'snap'
             elif base == rev - 1:
                 deltatype = b'prev'
             else:
                 deltatype = b'other'
         else:
             if base == rev:
                 deltatype = b'base'
             else:
                 deltatype = b'prev'
 
         chain = r._deltachain(rev)[0]
         chain_size = 0
         for iter_rev in reversed(chain):
             cached = chain_size_cache.get(iter_rev)
             if cached is not None:
                 chain_size += cached
                 break
             e = index[iter_rev]
             chain_size += e[revlog_constants.ENTRY_DATA_COMPRESSED_LENGTH]
         chain_size_cache[rev] = chain_size
 
         return p1, p2, compsize, uncompsize, deltatype, chain, chain_size
 
     fm = ui.formatter(b'debugdeltachain', opts)
 
     fm.plain(
         b'    rev      p1      p2  chain# chainlen     prev   delta       '
         b'size    rawsize  chainsize     ratio   lindist extradist '
         b'extraratio'
     )
     if withsparseread:
         fm.plain(b'   readsize largestblk rddensity srchunks')
     fm.plain(b'\n')
 
     chainbases = {}
     for rev in r:
         p1, p2, comp, uncomp, deltatype, chain, chainsize = revinfo(rev)
         chainbase = chain[0]
         chainid = chainbases.setdefault(chainbase, len(chainbases) + 1)
         basestart = start(chainbase)
         revstart = start(rev)
         lineardist = revstart + comp - basestart
         extradist = lineardist - chainsize
         try:
             prevrev = chain[-2]
         except IndexError:
             prevrev = -1
 
         if uncomp != 0:
             chainratio = float(chainsize) / float(uncomp)
         else:
             chainratio = chainsize
 
         if chainsize != 0:
             extraratio = float(extradist) / float(chainsize)
         else:
             extraratio = extradist
 
         fm.startitem()
         fm.write(
             b'rev p1 p2 chainid chainlen prevrev deltatype compsize '
             b'uncompsize chainsize chainratio lindist extradist '
             b'extraratio',
             b'%7d %7d %7d %7d %8d %8d %7s %10d %10d %10d %9.5f %9d %9d %10.5f',
             rev,
             p1,
             p2,
             chainid,
             len(chain),
             prevrev,
             deltatype,
             comp,
             uncomp,
             chainsize,
             chainratio,
             lineardist,
             extradist,
             extraratio,
             rev=rev,
             chainid=chainid,
             chainlen=len(chain),
             prevrev=prevrev,
             deltatype=deltatype,
             compsize=comp,
             uncompsize=uncomp,
             chainsize=chainsize,
             chainratio=chainratio,
             lindist=lineardist,
             extradist=extradist,
             extraratio=extraratio,
         )
         if withsparseread:
             readsize = 0
             largestblock = 0
             srchunks = 0
 
             for revschunk in deltautil.slicechunk(r, chain):
                 srchunks += 1
                 blkend = start(revschunk[-1]) + length(revschunk[-1])
                 blksize = blkend - start(revschunk[0])
 
                 readsize += blksize
                 if largestblock < blksize:
                     largestblock = blksize
 
             if readsize:
                 readdensity = float(chainsize) / float(readsize)
             else:
                 readdensity = 1
 
             fm.write(
                 b'readsize largestblock readdensity srchunks',
                 b' %10d %10d %9.5f %8d',
                 readsize,
                 largestblock,
                 readdensity,
                 srchunks,
                 readsize=readsize,
                 largestblock=largestblock,
                 readdensity=readdensity,
                 srchunks=srchunks,
             )
 
         fm.plain(b'\n')
 
     fm.end()
 
 
 @command(
     b'debug-delta-find',
     cmdutil.debugrevlogopts
     + cmdutil.formatteropts
     + [
         (
             b'',
             b'source',
             b'full',
             _(b'input data feed to the process (full, storage, p1, p2, prev)'),
         ),
     ],
     _(b'-c|-m|FILE REV'),
     optionalrepo=True,
 )
 def debugdeltafind(ui, repo, arg_1, arg_2=None, source=b'full', **opts):
     """display the computation to get to a valid delta for storing REV
 
     This command will replay the process used to find the "best" delta to store
     a revision and display information about all the steps used to get to that
     result.
 
     By default, the process is fed with a the full-text for the revision. This
     can be controlled with the --source flag.
 
     The revision use the revision number of the target storage (not changelog
     revision number).
 
     note: the process is initiated from a full text of the revision to store.
     """
     opts = pycompat.byteskwargs(opts)
     if arg_2 is None:
         file_ = None
         rev = arg_1
     else:
         file_ = arg_1
         rev = arg_2
 
     rev = int(rev)
 
     revlog = cmdutil.openrevlog(repo, b'debugdeltachain', file_, opts)
     p1r, p2r = revlog.parentrevs(rev)
 
     if source == b'full':
         base_rev = nullrev
     elif source == b'storage':
         base_rev = revlog.deltaparent(rev)
     elif source == b'p1':
         base_rev = p1r
     elif source == b'p2':
         base_rev = p2r
     elif source == b'prev':
         base_rev = rev - 1
     else:
         raise error.InputError(b"invalid --source value: %s" % source)
 
     revlog_debug.debug_delta_find(ui, revlog, rev, base_rev=base_rev)
 
 
 @command(
     b'debugdirstate|debugstate',
     [
         (
             b'',
             b'nodates',
             None,
             _(b'do not display the saved mtime (DEPRECATED)'),
         ),
         (b'', b'dates', True, _(b'display the saved mtime')),
         (b'', b'datesort', None, _(b'sort by saved mtime')),
         (
             b'',
             b'docket',
             False,
             _(b'display the docket (metadata file) instead'),
         ),
         (
             b'',
             b'all',
             False,
             _(b'display dirstate-v2 tree nodes that would not exist in v1'),
         ),
     ],
     _(b'[OPTION]...'),
 )
 def debugstate(ui, repo, **opts):
     """show the contents of the current dirstate"""
 
     if opts.get("docket"):
         if not repo.dirstate._use_dirstate_v2:
             raise error.Abort(_(b'dirstate v1 does not have a docket'))
 
         docket = repo.dirstate._map.docket
         (
             start_offset,
             root_nodes,
             nodes_with_entry,
             nodes_with_copy,
             unused_bytes,
             _unused,
             ignore_pattern,
         ) = dirstateutils.v2.TREE_METADATA.unpack(docket.tree_metadata)
 
         ui.write(_(b"size of dirstate data: %d\n") % docket.data_size)
         ui.write(_(b"data file uuid: %s\n") % docket.uuid)
         ui.write(_(b"start offset of root nodes: %d\n") % start_offset)
         ui.write(_(b"number of root nodes: %d\n") % root_nodes)
         ui.write(_(b"nodes with entries: %d\n") % nodes_with_entry)
         ui.write(_(b"nodes with copies: %d\n") % nodes_with_copy)
         ui.write(_(b"number of unused bytes: %d\n") % unused_bytes)
         ui.write(
             _(b"ignore pattern hash: %s\n") % binascii.hexlify(ignore_pattern)
         )
         return
 
     nodates = not opts['dates']
     if opts.get('nodates') is not None:
         nodates = True
     datesort = opts.get('datesort')
 
     if datesort:
 
         def keyfunc(entry):
             filename, _state, _mode, _size, mtime = entry
             return (mtime, filename)
 
     else:
         keyfunc = None  # sort by filename
     entries = list(repo.dirstate._map.debug_iter(all=opts['all']))
     entries.sort(key=keyfunc)
     for entry in entries:
         filename, state, mode, size, mtime = entry
         if mtime == -1:
             timestr = b'unset               '
         elif nodates:
             timestr = b'set                 '
         else:
             timestr = time.strftime("%Y-%m-%d %H:%M:%S ", time.localtime(mtime))
             timestr = encoding.strtolocal(timestr)
         if mode & 0o20000:
             mode = b'lnk'
         else:
             mode = b'%3o' % (mode & 0o777 & ~util.umask)
         ui.write(b"%c %s %10d %s%s\n" % (state, mode, size, timestr, filename))
     for f in repo.dirstate.copies():
         ui.write(_(b"copy: %s -> %s\n") % (repo.dirstate.copied(f), f))
 
 
 @command(
     b'debugdirstateignorepatternshash',
     [],
     _(b''),
 )
 def debugdirstateignorepatternshash(ui, repo, **opts):
     """show the hash of ignore patterns stored in dirstate if v2,
     or nothing for dirstate-v2
     """
     if repo.dirstate._use_dirstate_v2:
         docket = repo.dirstate._map.docket
         hash_len = 20  # 160 bits for SHA-1
         hash_bytes = docket.tree_metadata[-hash_len:]
         ui.write(binascii.hexlify(hash_bytes) + b'\n')
 
 
 @command(
     b'debugdiscovery',
     [
         (b'', b'old', None, _(b'use old-style discovery')),
         (
             b'',
             b'nonheads',
             None,
             _(b'use old-style discovery with non-heads included'),
         ),
         (b'', b'rev', [], b'restrict discovery to this set of revs'),
         (b'', b'seed', b'12323', b'specify the random seed use for discovery'),
         (
             b'',
             b'local-as-revs',
             b"",
             b'treat local has having these revisions only',
         ),
         (
             b'',
             b'remote-as-revs',
             b"",
             b'use local as remote, with only these revisions',
         ),
     ]
     + cmdutil.remoteopts
     + cmdutil.formatteropts,
     _(b'[--rev REV] [OTHER]'),
 )
 def debugdiscovery(ui, repo, remoteurl=b"default", **opts):
     """runs the changeset discovery protocol in isolation
 
     The local peer can be "replaced" by a subset of the local repository by
     using the `--local-as-revs` flag. In the same way, the usual `remote` peer
     can be "replaced" by a subset of the local repository using the
     `--remote-as-revs` flag. This is useful to efficiently debug pathological
     discovery situations.
 
     The following developer oriented config are relevant for people playing with this command:
 
     * devel.discovery.exchange-heads=True
 
       If False, the discovery will not start with
       remote head fetching and local head querying.
 
     * devel.discovery.grow-sample=True
 
       If False, the sample size used in set discovery will not be increased
       through the process
 
     * devel.discovery.grow-sample.dynamic=True
 
       When discovery.grow-sample.dynamic is True, the default, the sample size is
       adapted to the shape of the undecided set (it is set to the max of:
       <target-size>, len(roots(undecided)), len(heads(undecided)
 
     * devel.discovery.grow-sample.rate=1.05
 
       the rate at which the sample grow
 
     * devel.discovery.randomize=True
 
       If andom sampling during discovery are deterministic. It is meant for
       integration tests.
 
     * devel.discovery.sample-size=200
 
       Control the initial size of the discovery sample
 
     * devel.discovery.sample-size.initial=100
 
       Control the initial size of the discovery for initial change
     """
     opts = pycompat.byteskwargs(opts)
     unfi = repo.unfiltered()
 
     # setup potential extra filtering
     local_revs = opts[b"local_as_revs"]
     remote_revs = opts[b"remote_as_revs"]
 
     # make sure tests are repeatable
     random.seed(int(opts[b'seed']))
 
     if not remote_revs:
         path = urlutil.get_unique_pull_path_obj(
             b'debugdiscovery', ui, remoteurl
         )
         branches = (path.branch, [])
         remote = hg.peer(repo, opts, path)
         ui.status(_(b'comparing with %s\n') % urlutil.hidepassword(path.loc))
     else:
         branches = (None, [])
         remote_filtered_revs = logcmdutil.revrange(
             unfi, [b"not (::(%s))" % remote_revs]
         )
         remote_filtered_revs = frozenset(remote_filtered_revs)
 
         def remote_func(x):
             return remote_filtered_revs
 
         repoview.filtertable[b'debug-discovery-remote-filter'] = remote_func
 
         remote = repo.peer()
         remote._repo = remote._repo.filtered(b'debug-discovery-remote-filter')
 
     if local_revs:
         local_filtered_revs = logcmdutil.revrange(
             unfi, [b"not (::(%s))" % local_revs]
         )
         local_filtered_revs = frozenset(local_filtered_revs)
 
         def local_func(x):
             return local_filtered_revs
 
         repoview.filtertable[b'debug-discovery-local-filter'] = local_func
         repo = repo.filtered(b'debug-discovery-local-filter')
 
     data = {}
     if opts.get(b'old'):
 
         def doit(pushedrevs, remoteheads, remote=remote):
             if not util.safehasattr(remote, b'branches'):
                 # enable in-client legacy support
                 remote = localrepo.locallegacypeer(remote.local())
                 if remote_revs:
                     r = remote._repo.filtered(b'debug-discovery-remote-filter')
                     remote._repo = r
             common, _in, hds = treediscovery.findcommonincoming(
                 repo, remote, force=True, audit=data
             )
             common = set(common)
             if not opts.get(b'nonheads'):
                 ui.writenoi18n(
                     b"unpruned common: %s\n"
                     % b" ".join(sorted(short(n) for n in common))
                 )
 
                 clnode = repo.changelog.node
                 common = repo.revs(b'heads(::%ln)', common)
                 common = {clnode(r) for r in common}
             return common, hds
 
     else:
 
         def doit(pushedrevs, remoteheads, remote=remote):
             nodes = None
             if pushedrevs:
                 revs = logcmdutil.revrange(repo, pushedrevs)
                 nodes = [repo[r].node() for r in revs]
             common, any, hds = setdiscovery.findcommonheads(
                 ui,
                 repo,
                 remote,
                 ancestorsof=nodes,
                 audit=data,
                 abortwhenunrelated=False,
             )
             return common, hds
 
     remoterevs, _checkout = hg.addbranchrevs(repo, remote, branches, revs=None)
     localrevs = opts[b'rev']
 
     fm = ui.formatter(b'debugdiscovery', opts)
     if fm.strict_format:
 
         @contextlib.contextmanager
         def may_capture_output():
             ui.pushbuffer()
             yield
             data[b'output'] = ui.popbuffer()
 
     else:
         may_capture_output = util.nullcontextmanager
     with may_capture_output():
         with util.timedcm('debug-discovery') as t:
             common, hds = doit(localrevs, remoterevs)
 
     # compute all statistics
     if len(common) == 1 and repo.nullid in common:
         common = set()
     heads_common = set(common)
     heads_remote = set(hds)
     heads_local = set(repo.heads())
     # note: they cannot be a local or remote head that is in common and not
     # itself a head of common.
     heads_common_local = heads_common & heads_local
     heads_common_remote = heads_common & heads_remote
     heads_common_both = heads_common & heads_remote & heads_local
 
     all = repo.revs(b'all()')
     common = repo.revs(b'::%ln', common)
     roots_common = repo.revs(b'roots(::%ld)', common)
     missing = repo.revs(b'not ::%ld', common)
     heads_missing = repo.revs(b'heads(%ld)', missing)
     roots_missing = repo.revs(b'roots(%ld)', missing)
     assert len(common) + len(missing) == len(all)
 
     initial_undecided = repo.revs(
         b'not (::%ln or %ln::)', heads_common_remote, heads_common_local
     )
     heads_initial_undecided = repo.revs(b'heads(%ld)', initial_undecided)
     roots_initial_undecided = repo.revs(b'roots(%ld)', initial_undecided)
     common_initial_undecided = initial_undecided & common
     missing_initial_undecided = initial_undecided & missing
 
     data[b'elapsed'] = t.elapsed
     data[b'nb-common-heads'] = len(heads_common)
     data[b'nb-common-heads-local'] = len(heads_common_local)
     data[b'nb-common-heads-remote'] = len(heads_common_remote)
     data[b'nb-common-heads-both'] = len(heads_common_both)
     data[b'nb-common-roots'] = len(roots_common)
     data[b'nb-head-local'] = len(heads_local)
     data[b'nb-head-local-missing'] = len(heads_local) - len(heads_common_local)
     data[b'nb-head-remote'] = len(heads_remote)
     data[b'nb-head-remote-unknown'] = len(heads_remote) - len(
         heads_common_remote
     )
     data[b'nb-revs'] = len(all)
     data[b'nb-revs-common'] = len(common)
     data[b'nb-revs-missing'] = len(missing)
     data[b'nb-missing-heads'] = len(heads_missing)
     data[b'nb-missing-roots'] = len(roots_missing)
     data[b'nb-ini_und'] = len(initial_undecided)
     data[b'nb-ini_und-heads'] = len(heads_initial_undecided)
     data[b'nb-ini_und-roots'] = len(roots_initial_undecided)
     data[b'nb-ini_und-common'] = len(common_initial_undecided)
     data[b'nb-ini_und-missing'] = len(missing_initial_undecided)
 
     fm.startitem()
     fm.data(**pycompat.strkwargs(data))
     # display discovery summary
     fm.plain(b"elapsed time:  %(elapsed)f seconds\n" % data)
     fm.plain(b"round-trips:           %(total-roundtrips)9d\n" % data)
     if b'total-round-trips-heads' in data:
         fm.plain(
             b"  round-trips-heads:    %(total-round-trips-heads)9d\n" % data
         )
     if b'total-round-trips-branches' in data:
         fm.plain(
             b"  round-trips-branches:    %(total-round-trips-branches)9d\n"
             % data
         )
     if b'total-round-trips-between' in data:
         fm.plain(
             b"  round-trips-between:    %(total-round-trips-between)9d\n" % data
         )
     fm.plain(b"queries:               %(total-queries)9d\n" % data)
     if b'total-queries-branches' in data:
         fm.plain(b"  queries-branches:    %(total-queries-branches)9d\n" % data)
     if b'total-queries-between' in data:
         fm.plain(b"  queries-between:     %(total-queries-between)9d\n" % data)
     fm.plain(b"heads summary:\n")
     fm.plain(b"  total common heads:  %(nb-common-heads)9d\n" % data)
     fm.plain(b"    also local heads:  %(nb-common-heads-local)9d\n" % data)
     fm.plain(b"    also remote heads: %(nb-common-heads-remote)9d\n" % data)
     fm.plain(b"    both:              %(nb-common-heads-both)9d\n" % data)
     fm.plain(b"  local heads:         %(nb-head-local)9d\n" % data)
     fm.plain(b"    common:            %(nb-common-heads-local)9d\n" % data)
     fm.plain(b"    missing:           %(nb-head-local-missing)9d\n" % data)
     fm.plain(b"  remote heads:        %(nb-head-remote)9d\n" % data)
     fm.plain(b"    common:            %(nb-common-heads-remote)9d\n" % data)
     fm.plain(b"    unknown:           %(nb-head-remote-unknown)9d\n" % data)
     fm.plain(b"local changesets:      %(nb-revs)9d\n" % data)
     fm.plain(b"  common:              %(nb-revs-common)9d\n" % data)
     fm.plain(b"    heads:             %(nb-common-heads)9d\n" % data)
     fm.plain(b"    roots:             %(nb-common-roots)9d\n" % data)
     fm.plain(b"  missing:             %(nb-revs-missing)9d\n" % data)
     fm.plain(b"    heads:             %(nb-missing-heads)9d\n" % data)
     fm.plain(b"    roots:             %(nb-missing-roots)9d\n" % data)
     fm.plain(b"  first undecided set: %(nb-ini_und)9d\n" % data)
     fm.plain(b"    heads:             %(nb-ini_und-heads)9d\n" % data)
     fm.plain(b"    roots:             %(nb-ini_und-roots)9d\n" % data)
     fm.plain(b"    common:            %(nb-ini_und-common)9d\n" % data)
     fm.plain(b"    missing:           %(nb-ini_und-missing)9d\n" % data)
 
     if ui.verbose:
         fm.plain(
             b"common heads: %s\n"
             % b" ".join(sorted(short(n) for n in heads_common))
         )
     fm.end()
 
 
 _chunksize = 4 << 10
 
 
 @command(
     b'debugdownload',
     [
         (b'o', b'output', b'', _(b'path')),
     ],
     optionalrepo=True,
 )
 def debugdownload(ui, repo, url, output=None, **opts):
     """download a resource using Mercurial logic and config"""
     fh = urlmod.open(ui, url, output)
 
     dest = ui
     if output:
         dest = open(output, b"wb", _chunksize)
     try:
         data = fh.read(_chunksize)
         while data:
             dest.write(data)
             data = fh.read(_chunksize)
     finally:
         if output:
             dest.close()
 
 
 @command(b'debugextensions', cmdutil.formatteropts, [], optionalrepo=True)
 def debugextensions(ui, repo, **opts):
     '''show information about active extensions'''
     opts = pycompat.byteskwargs(opts)
     exts = extensions.extensions(ui)
     hgver = util.version()
     fm = ui.formatter(b'debugextensions', opts)
     for extname, extmod in sorted(exts, key=operator.itemgetter(0)):
         isinternal = extensions.ismoduleinternal(extmod)
         extsource = None
 
         if util.safehasattr(extmod, '__file__'):
             extsource = pycompat.fsencode(extmod.__file__)
         elif getattr(sys, 'oxidized', False):
             extsource = pycompat.sysexecutable
         if isinternal:
             exttestedwith = []  # never expose magic string to users
         else:
             exttestedwith = getattr(extmod, 'testedwith', b'').split()
         extbuglink = getattr(extmod, 'buglink', None)
 
         fm.startitem()
 
         if ui.quiet or ui.verbose:
             fm.write(b'name', b'%s\n', extname)
         else:
             fm.write(b'name', b'%s', extname)
             if isinternal or hgver in exttestedwith:
                 fm.plain(b'\n')
             elif not exttestedwith:
                 fm.plain(_(b' (untested!)\n'))
             else:
                 lasttestedversion = exttestedwith[-1]
                 fm.plain(b' (%s!)\n' % lasttestedversion)
 
         fm.condwrite(
             ui.verbose and extsource,
             b'source',
             _(b'  location: %s\n'),
             extsource or b"",
         )
 
         if ui.verbose:
             fm.plain(_(b'  bundled: %s\n') % [b'no', b'yes'][isinternal])
         fm.data(bundled=isinternal)
 
         fm.condwrite(
             ui.verbose and exttestedwith,
             b'testedwith',
             _(b'  tested with: %s\n'),
             fm.formatlist(exttestedwith, name=b'ver'),
         )
 
         fm.condwrite(
             ui.verbose and extbuglink,
             b'buglink',
             _(b'  bug reporting: %s\n'),
             extbuglink or b"",
         )
 
     fm.end()
 
 
 @command(
     b'debugfileset',
     [
         (
             b'r',
             b'rev',
             b'',
             _(b'apply the filespec on this revision'),
             _(b'REV'),
         ),
         (
             b'',
             b'all-files',
             False,
             _(b'test files from all revisions and working directory'),
         ),
         (
             b's',
             b'show-matcher',
             None,
             _(b'print internal representation of matcher'),
         ),
         (
             b'p',
             b'show-stage',
             [],
             _(b'print parsed tree at the given stage'),
             _(b'NAME'),
         ),
     ],
     _(b'[-r REV] [--all-files] [OPTION]... FILESPEC'),
 )
 def debugfileset(ui, repo, expr, **opts):
     '''parse and apply a fileset specification'''
     from . import fileset
 
     fileset.symbols  # force import of fileset so we have predicates to optimize
     opts = pycompat.byteskwargs(opts)
     ctx = logcmdutil.revsingle(repo, opts.get(b'rev'), None)
 
     stages = [
         (b'parsed', pycompat.identity),
         (b'analyzed', filesetlang.analyze),
         (b'optimized', filesetlang.optimize),
     ]
     stagenames = {n for n, f in stages}
 
     showalways = set()
     if ui.verbose and not opts[b'show_stage']:
         # show parsed tree by --verbose (deprecated)
         showalways.add(b'parsed')
     if opts[b'show_stage'] == [b'all']:
         showalways.update(stagenames)
     else:
         for n in opts[b'show_stage']:
             if n not in stagenames:
                 raise error.Abort(_(b'invalid stage name: %s') % n)
         showalways.update(opts[b'show_stage'])
 
     tree = filesetlang.parse(expr)
     for n, f in stages:
         tree = f(tree)
         if n in showalways:
             if opts[b'show_stage'] or n != b'parsed':
                 ui.write(b"* %s:\n" % n)
             ui.write(filesetlang.prettyformat(tree), b"\n")
 
     files = set()
     if opts[b'all_files']:
         for r in repo:
             c = repo[r]
             files.update(c.files())
             files.update(c.substate)
     if opts[b'all_files'] or ctx.rev() is None:
         wctx = repo[None]
         files.update(
             repo.dirstate.walk(
                 scmutil.matchall(repo),
                 subrepos=list(wctx.substate),
                 unknown=True,
                 ignored=True,
             )
         )
         files.update(wctx.substate)
     else:
         files.update(ctx.files())
         files.update(ctx.substate)
 
     m = ctx.matchfileset(repo.getcwd(), expr)
     if opts[b'show_matcher'] or (opts[b'show_matcher'] is None and ui.verbose):
         ui.writenoi18n(b'* matcher:\n', stringutil.prettyrepr(m), b'\n')
     for f in sorted(files):
         if not m(f):
             continue
         ui.write(b"%s\n" % f)
 
 
 @command(
     b"debug-repair-issue6528",
     [
         (
             b'',
             b'to-report',
             b'',
             _(b'build a report of affected revisions to this file'),
             _(b'FILE'),
         ),
         (
             b'',
             b'from-report',
             b'',
             _(b'repair revisions listed in this report file'),
             _(b'FILE'),
         ),
         (
             b'',
             b'paranoid',
             False,
             _(b'check that both detection methods do the same thing'),
         ),
     ]
     + cmdutil.dryrunopts,
 )
 def debug_repair_issue6528(ui, repo, **opts):
     """find affected revisions and repair them. See issue6528 for more details.
 
     The `--to-report` and `--from-report` flags allow you to cache and reuse the
     computation of affected revisions for a given repository across clones.
     The report format is line-based (with empty lines ignored):
 
     ```
     <ascii-hex of the affected revision>,... <unencoded filelog index filename>
     ```
 
     There can be multiple broken revisions per filelog, they are separated by
     a comma with no spaces. The only space is between the revision(s) and the
     filename.
 
     Note that this does *not* mean that this repairs future affected revisions,
     that needs a separate fix at the exchange level that was introduced in
     Mercurial 5.9.1.
 
     There is a `--paranoid` flag to test that the fast implementation is correct
     by checking it against the slow implementation. Since this matter is quite
     urgent and testing every edge-case is probably quite costly, we use this
     method to test on large repositories as a fuzzing method of sorts.
     """
     cmdutil.check_incompatible_arguments(
         opts, 'to_report', ['from_report', 'dry_run']
     )
     dry_run = opts.get('dry_run')
     to_report = opts.get('to_report')
     from_report = opts.get('from_report')
     paranoid = opts.get('paranoid')
     # TODO maybe add filelog pattern and revision pattern parameters to help
     # narrow down the search for users that know what they're looking for?
 
     if requirements.REVLOGV1_REQUIREMENT not in repo.requirements:
         msg = b"can only repair revlogv1 repositories, v2 is not affected"
         raise error.Abort(_(msg))
 
     rewrite.repair_issue6528(
         ui,
         repo,
         dry_run=dry_run,
         to_report=to_report,
         from_report=from_report,
         paranoid=paranoid,
     )
 
 
 @command(b'debugformat', [] + cmdutil.formatteropts)
 def debugformat(ui, repo, **opts):
     """display format information about the current repository
 
     Use --verbose to get extra information about current config value and
     Mercurial default."""
     opts = pycompat.byteskwargs(opts)
     maxvariantlength = max(len(fv.name) for fv in upgrade.allformatvariant)
     maxvariantlength = max(len(b'format-variant'), maxvariantlength)
 
     def makeformatname(name):
         return b'%s:' + (b' ' * (maxvariantlength - len(name)))
 
     fm = ui.formatter(b'debugformat', opts)
     if fm.isplain():
 
         def formatvalue(value):
             if util.safehasattr(value, b'startswith'):
                 return value
             if value:
                 return b'yes'
             else:
                 return b'no'
 
     else:
         formatvalue = pycompat.identity
 
     fm.plain(b'format-variant')
     fm.plain(b' ' * (maxvariantlength - len(b'format-variant')))
     fm.plain(b' repo')
     if ui.verbose:
         fm.plain(b' config default')
     fm.plain(b'\n')
     for fv in upgrade.allformatvariant:
         fm.startitem()
         repovalue = fv.fromrepo(repo)
         configvalue = fv.fromconfig(repo)
 
         if repovalue != configvalue:
             namelabel = b'formatvariant.name.mismatchconfig'
             repolabel = b'formatvariant.repo.mismatchconfig'
         elif repovalue != fv.default:
             namelabel = b'formatvariant.name.mismatchdefault'
             repolabel = b'formatvariant.repo.mismatchdefault'
         else:
             namelabel = b'formatvariant.name.uptodate'
             repolabel = b'formatvariant.repo.uptodate'
 
         fm.write(b'name', makeformatname(fv.name), fv.name, label=namelabel)
         fm.write(b'repo', b' %3s', formatvalue(repovalue), label=repolabel)
         if fv.default != configvalue:
             configlabel = b'formatvariant.config.special'
         else:
             configlabel = b'formatvariant.config.default'
         fm.condwrite(
             ui.verbose,
             b'config',
             b' %6s',
             formatvalue(configvalue),
             label=configlabel,
         )
         fm.condwrite(
             ui.verbose,
             b'default',
             b' %7s',
             formatvalue(fv.default),
             label=b'formatvariant.default',
         )
         fm.plain(b'\n')
     fm.end()
 
 
 @command(b'debugfsinfo', [], _(b'[PATH]'), norepo=True)
 def debugfsinfo(ui, path=b"."):
     """show information detected about current filesystem"""
     ui.writenoi18n(b'path: %s\n' % path)
     ui.writenoi18n(
         b'mounted on: %s\n' % (util.getfsmountpoint(path) or b'(unknown)')
     )
     ui.writenoi18n(b'exec: %s\n' % (util.checkexec(path) and b'yes' or b'no'))
     ui.writenoi18n(b'fstype: %s\n' % (util.getfstype(path) or b'(unknown)'))
     ui.writenoi18n(
         b'symlink: %s\n' % (util.checklink(path) and b'yes' or b'no')
     )
     ui.writenoi18n(
         b'hardlink: %s\n' % (util.checknlink(path) and b'yes' or b'no')
     )
     casesensitive = b'(unknown)'
     try:
         with pycompat.namedtempfile(prefix=b'.debugfsinfo', dir=path) as f:
             casesensitive = util.fscasesensitive(f.name) and b'yes' or b'no'
     except OSError:
         pass
     ui.writenoi18n(b'case-sensitive: %s\n' % casesensitive)
 
 
 @command(
     b'debuggetbundle',
     [
         (b'H', b'head', [], _(b'id of head node'), _(b'ID')),
         (b'C', b'common', [], _(b'id of common node'), _(b'ID')),
         (
             b't',
             b'type',
             b'bzip2',
             _(b'bundle compression type to use'),
             _(b'TYPE'),
         ),
     ],
     _(b'REPO FILE [-H|-C ID]...'),
     norepo=True,
 )
 def debuggetbundle(ui, repopath, bundlepath, head=None, common=None, **opts):
     """retrieves a bundle from a repo
 
     Every ID must be a full-length hex node id string. Saves the bundle to the
     given file.
     """
     opts = pycompat.byteskwargs(opts)
     repo = hg.peer(ui, opts, repopath)
     if not repo.capable(b'getbundle'):
         raise error.Abort(b"getbundle() not supported by target repository")
     args = {}
     if common:
         args['common'] = [bin(s) for s in common]
     if head:
         args['heads'] = [bin(s) for s in head]
     # TODO: get desired bundlecaps from command line.
     args['bundlecaps'] = None
     bundle = repo.getbundle(b'debug', **args)
 
     bundletype = opts.get(b'type', b'bzip2').lower()
     btypes = {
         b'none': b'HG10UN',
         b'bzip2': b'HG10BZ',
         b'gzip': b'HG10GZ',
         b'bundle2': b'HG20',
     }
     bundletype = btypes.get(bundletype)
     if bundletype not in bundle2.bundletypes:
         raise error.Abort(_(b'unknown bundle type specified with --type'))
     bundle2.writebundle(ui, bundle, bundlepath, bundletype)
 
 
 @command(b'debugignore', [], b'[FILE]')
 def debugignore(ui, repo, *files, **opts):
     """display the combined ignore pattern and information about ignored files
 
     With no argument display the combined ignore pattern.
 
     Given space separated file names, shows if the given file is ignored and
     if so, show the ignore rule (file and line number) that matched it.
     """
     ignore = repo.dirstate._ignore
     if not files:
         # Show all the patterns
         ui.write(b"%s\n" % pycompat.byterepr(ignore))
     else:
         m = scmutil.match(repo[None], pats=files)
         uipathfn = scmutil.getuipathfn(repo, legacyrelativevalue=True)
         for f in m.files():
             nf = util.normpath(f)
             ignored = None
             ignoredata = None
             if nf != b'.':
                 if ignore(nf):
                     ignored = nf
                     ignoredata = repo.dirstate._ignorefileandline(nf)
                 else:
                     for p in pathutil.finddirs(nf):
                         if ignore(p):
                             ignored = p
                             ignoredata = repo.dirstate._ignorefileandline(p)
                             break
             if ignored:
                 if ignored == nf:
                     ui.write(_(b"%s is ignored\n") % uipathfn(f))
                 else:
                     ui.write(
                         _(
                             b"%s is ignored because of "
                             b"containing directory %s\n"
                         )
                         % (uipathfn(f), ignored)
                     )
                 ignorefile, lineno, line = ignoredata
                 ui.write(
                     _(b"(ignore rule in %s, line %d: '%s')\n")
                     % (ignorefile, lineno, line)
                 )
             else:
                 ui.write(_(b"%s is not ignored\n") % uipathfn(f))
 
 
 @command(
     b'debug-revlog-index|debugindex',
     cmdutil.debugrevlogopts + cmdutil.formatteropts,
     _(b'-c|-m|FILE'),
 )
 def debugindex(ui, repo, file_=None, **opts):
     """dump index data for a revlog"""
     opts = pycompat.byteskwargs(opts)
     store = cmdutil.openstorage(repo, b'debugindex', file_, opts)
 
     fm = ui.formatter(b'debugindex', opts)
 
     revlog = getattr(store, b'_revlog', store)
 
     return revlog_debug.debug_index(
         ui,
         repo,
         formatter=fm,
         revlog=revlog,
         full_node=ui.debugflag,
     )
 
 
 @command(
     b'debugindexdot',
     cmdutil.debugrevlogopts,
     _(b'-c|-m|FILE'),
     optionalrepo=True,
 )
 def debugindexdot(ui, repo, file_=None, **opts):
     """dump an index DAG as a graphviz dot file"""
     opts = pycompat.byteskwargs(opts)
     r = cmdutil.openstorage(repo, b'debugindexdot', file_, opts)
     ui.writenoi18n(b"digraph G {\n")
     for i in r:
         node = r.node(i)
         pp = r.parents(node)
         ui.write(b"\t%d -> %d\n" % (r.rev(pp[0]), i))
         if pp[1] != repo.nullid:
             ui.write(b"\t%d -> %d\n" % (r.rev(pp[1]), i))
     ui.write(b"}\n")
 
 
 @command(b'debugindexstats', [])
 def debugindexstats(ui, repo):
     """show stats related to the changelog index"""
     repo.changelog.shortest(repo.nullid, 1)
     index = repo.changelog.index
     if not util.safehasattr(index, b'stats'):
         raise error.Abort(_(b'debugindexstats only works with native code'))
     for k, v in sorted(index.stats().items()):
         ui.write(b'%s: %d\n' % (k, v))
 
 
 @command(b'debuginstall', [] + cmdutil.formatteropts, b'', norepo=True)
 def debuginstall(ui, **opts):
     """test Mercurial installation
 
     Returns 0 on success.
     """
     opts = pycompat.byteskwargs(opts)
 
     problems = 0
 
     fm = ui.formatter(b'debuginstall', opts)
     fm.startitem()
 
     # encoding might be unknown or wrong. don't translate these messages.
     fm.write(b'encoding', b"checking encoding (%s)...\n", encoding.encoding)
     err = None
     try:
         codecs.lookup(pycompat.sysstr(encoding.encoding))
     except LookupError as inst:
         err = stringutil.forcebytestr(inst)
         problems += 1
     fm.condwrite(
         err,
         b'encodingerror',
         b" %s\n (check that your locale is properly set)\n",
         err,
     )
 
     # Python
     pythonlib = None
     if util.safehasattr(os, '__file__'):
         pythonlib = os.path.dirname(pycompat.fsencode(os.__file__))
     elif getattr(sys, 'oxidized', False):
         pythonlib = pycompat.sysexecutable
 
     fm.write(
         b'pythonexe',
         _(b"checking Python executable (%s)\n"),
         pycompat.sysexecutable or _(b"unknown"),
     )
     fm.write(
         b'pythonimplementation',
         _(b"checking Python implementation (%s)\n"),
         pycompat.sysbytes(platform.python_implementation()),
     )
     fm.write(
         b'pythonver',
         _(b"checking Python version (%s)\n"),
         (b"%d.%d.%d" % sys.version_info[:3]),
     )
     fm.write(
         b'pythonlib',
         _(b"checking Python lib (%s)...\n"),
         pythonlib or _(b"unknown"),
     )
 
     try:
         from . import rustext  # pytype: disable=import-error
 
         rustext.__doc__  # trigger lazy import
     except ImportError:
         rustext = None
 
     security = set(sslutil.supportedprotocols)
     if sslutil.hassni:
         security.add(b'sni')
 
     fm.write(
         b'pythonsecurity',
         _(b"checking Python security support (%s)\n"),
         fm.formatlist(sorted(security), name=b'protocol', fmt=b'%s', sep=b','),
     )
 
     # These are warnings, not errors. So don't increment problem count. This
     # may change in the future.
     if b'tls1.2' not in security:
         fm.plain(
             _(
                 b'  TLS 1.2 not supported by Python install; '
                 b'network connections lack modern security\n'
             )
         )
     if b'sni' not in security:
         fm.plain(
             _(
                 b'  SNI not supported by Python install; may have '
                 b'connectivity issues with some servers\n'
             )
         )
 
     fm.plain(
         _(
             b"checking Rust extensions (%s)\n"
             % (b'missing' if rustext is None else b'installed')
         ),
     )
 
     # TODO print CA cert info
 
     # hg version
     hgver = util.version()
     fm.write(
         b'hgver', _(b"checking Mercurial version (%s)\n"), hgver.split(b'+')[0]
     )
     fm.write(
         b'hgverextra',
         _(b"checking Mercurial custom build (%s)\n"),
         b'+'.join(hgver.split(b'+')[1:]),
     )
 
     # compiled modules
     hgmodules = None
     if util.safehasattr(sys.modules[__name__], '__file__'):
         hgmodules = os.path.dirname(pycompat.fsencode(__file__))
     elif getattr(sys, 'oxidized', False):
         hgmodules = pycompat.sysexecutable
 
     fm.write(
         b'hgmodulepolicy', _(b"checking module policy (%s)\n"), policy.policy
     )
     fm.write(
         b'hgmodules',
         _(b"checking installed modules (%s)...\n"),
         hgmodules or _(b"unknown"),
     )
 
     rustandc = policy.policy in (b'rust+c', b'rust+c-allow')
     rustext = rustandc  # for now, that's the only case
     cext = policy.policy in (b'c', b'allow') or rustandc
     nopure = cext or rustext
     if nopure:
         err = None
         try:
             if cext:
                 from .cext import (  # pytype: disable=import-error
                     base85,
                     bdiff,
                     mpatch,
                     osutil,
                 )
 
                 # quiet pyflakes
                 dir(bdiff), dir(mpatch), dir(base85), dir(osutil)
             if rustext:
                 from .rustext import (  # pytype: disable=import-error
                     ancestor,
                     dirstate,
                 )
 
                 dir(ancestor), dir(dirstate)  # quiet pyflakes
         except Exception as inst:
             err = stringutil.forcebytestr(inst)
             problems += 1
         fm.condwrite(err, b'extensionserror', b" %s\n", err)
 
     compengines = util.compengines._engines.values()
     fm.write(
         b'compengines',
         _(b'checking registered compression engines (%s)\n'),
         fm.formatlist(
             sorted(e.name() for e in compengines),
             name=b'compengine',
             fmt=b'%s',
             sep=b', ',
         ),
     )
     fm.write(
         b'compenginesavail',
         _(b'checking available compression engines (%s)\n'),
         fm.formatlist(
             sorted(e.name() for e in compengines if e.available()),
             name=b'compengine',
             fmt=b'%s',
             sep=b', ',
         ),
     )
     wirecompengines = compression.compengines.supportedwireengines(
         compression.SERVERROLE
     )
     fm.write(
         b'compenginesserver',
         _(
             b'checking available compression engines '
             b'for wire protocol (%s)\n'
         ),
         fm.formatlist(
             [e.name() for e in wirecompengines if e.wireprotosupport()],
             name=b'compengine',
             fmt=b'%s',
             sep=b', ',
         ),
     )
     re2 = b'missing'
     if util._re2:
         re2 = b'available'
     fm.plain(_(b'checking "re2" regexp engine (%s)\n') % re2)
     fm.data(re2=bool(util._re2))
 
     # templates
     p = templater.templatedir()
     fm.write(b'templatedirs', b'checking templates (%s)...\n', p or b'')
     fm.condwrite(not p, b'', _(b" no template directories found\n"))
     if p:
         (m, fp) = templater.try_open_template(b"map-cmdline.default")
         if m:
             # template found, check if it is working
             err = None
             try:
                 templater.templater.frommapfile(m)
             except Exception as inst:
                 err = stringutil.forcebytestr(inst)
                 p = None
             fm.condwrite(err, b'defaulttemplateerror', b" %s\n", err)
         else:
             p = None
         fm.condwrite(
             p, b'defaulttemplate', _(b"checking default template (%s)\n"), m
         )
         fm.condwrite(
             not m,
             b'defaulttemplatenotfound',
             _(b" template '%s' not found\n"),
             b"default",
         )
     if not p:
         problems += 1
     fm.condwrite(
         not p, b'', _(b" (templates seem to have been installed incorrectly)\n")
     )
 
     # editor
     editor = ui.geteditor()
     editor = util.expandpath(editor)
     editorbin = procutil.shellsplit(editor)[0]
     fm.write(b'editor', _(b"checking commit editor... (%s)\n"), editorbin)
     cmdpath = procutil.findexe(editorbin)
     fm.condwrite(
         not cmdpath and editor == b'vi',
         b'vinotfound',
         _(
             b" No commit editor set and can't find %s in PATH\n"
             b" (specify a commit editor in your configuration"
             b" file)\n"
         ),
         not cmdpath and editor == b'vi' and editorbin,
     )
     fm.condwrite(
         not cmdpath and editor != b'vi',
         b'editornotfound',
         _(
             b" Can't find editor '%s' in PATH\n"
             b" (specify a commit editor in your configuration"
             b" file)\n"
         ),
         not cmdpath and editorbin,
     )
     if not cmdpath and editor != b'vi':
         problems += 1
 
     # check username
     username = None
     err = None
     try:
         username = ui.username()
     except error.Abort as e:
         err = e.message
         problems += 1
 
     fm.condwrite(
         username, b'username', _(b"checking username (%s)\n"), username
     )
     fm.condwrite(
         err,
         b'usernameerror',
         _(
             b"checking username...\n %s\n"
             b" (specify a username in your configuration file)\n"
         ),
         err,
     )
 
     for name, mod in extensions.extensions():
         handler = getattr(mod, 'debuginstall', None)
         if handler is not None:
             problems += handler(ui, fm)
 
     fm.condwrite(not problems, b'', _(b"no problems detected\n"))
     if not problems:
         fm.data(problems=problems)
     fm.condwrite(
         problems,
         b'problems',
         _(b"%d problems detected, please check your install!\n"),
         problems,
     )
     fm.end()
 
     return problems
 
 
 @command(b'debugknown', [], _(b'REPO ID...'), norepo=True)
 def debugknown(ui, repopath, *ids, **opts):
     """test whether node ids are known to a repo
 
     Every ID must be a full-length hex node id string. Returns a list of 0s
     and 1s indicating unknown/known.
     """
     opts = pycompat.byteskwargs(opts)
     repo = hg.peer(ui, opts, repopath)
     if not repo.capable(b'known'):
         raise error.Abort(b"known() not supported by target repository")
     flags = repo.known([bin(s) for s in ids])
     ui.write(b"%s\n" % (b"".join([f and b"1" or b"0" for f in flags])))
 
 
 @command(b'debuglabelcomplete', [], _(b'LABEL...'))
 def debuglabelcomplete(ui, repo, *args):
     '''backwards compatibility with old bash completion scripts (DEPRECATED)'''
     debugnamecomplete(ui, repo, *args)
 
 
 @command(
     b'debuglocks',
     [
         (b'L', b'force-free-lock', None, _(b'free the store lock (DANGEROUS)')),
         (
             b'W',
             b'force-free-wlock',
             None,
             _(b'free the working state lock (DANGEROUS)'),
         ),
         (b's', b'set-lock', None, _(b'set the store lock until stopped')),
         (
             b'S',
             b'set-wlock',
             None,
             _(b'set the working state lock until stopped'),
         ),
     ],
     _(b'[OPTION]...'),
 )
 def debuglocks(ui, repo, **opts):
     """show or modify state of locks
 
     By default, this command will show which locks are held. This
     includes the user and process holding the lock, the amount of time
     the lock has been held, and the machine name where the process is
     running if it's not local.
 
     Locks protect the integrity of Mercurial's data, so should be
     treated with care. System crashes or other interruptions may cause
     locks to not be properly released, though Mercurial will usually
     detect and remove such stale locks automatically.
 
     However, detecting stale locks may not always be possible (for
     instance, on a shared filesystem). Removing locks may also be
     blocked by filesystem permissions.
 
     Setting a lock will prevent other commands from changing the data.
     The command will wait until an interruption (SIGINT, SIGTERM, ...) occurs.
     The set locks are removed when the command exits.
 
     Returns 0 if no locks are held.
 
     """
 
     if opts.get('force_free_lock'):
         repo.svfs.tryunlink(b'lock')
     if opts.get('force_free_wlock'):
         repo.vfs.tryunlink(b'wlock')
     if opts.get('force_free_lock') or opts.get('force_free_wlock'):
         return 0
 
     locks = []
     try:
         if opts.get('set_wlock'):
             try:
                 locks.append(repo.wlock(False))
             except error.LockHeld:
                 raise error.Abort(_(b'wlock is already held'))
         if opts.get('set_lock'):
             try:
                 locks.append(repo.lock(False))
             except error.LockHeld:
                 raise error.Abort(_(b'lock is already held'))
         if len(locks):
             try:
                 if ui.interactive():
                     prompt = _(b"ready to release the lock (y)? $$ &Yes")
                     ui.promptchoice(prompt)
                 else:
                     msg = b"%d locks held, waiting for signal\n"
                     msg %= len(locks)
                     ui.status(msg)
                     while True:  # XXX wait for a signal
                         time.sleep(0.1)
             except KeyboardInterrupt:
                 msg = b"signal-received releasing locks\n"
                 ui.status(msg)
             return 0
     finally:
         release(*locks)
 
     now = time.time()
     held = 0
 
     def report(vfs, name, method):
         # this causes stale locks to get reaped for more accurate reporting
         try:
             l = method(False)
         except error.LockHeld:
             l = None
 
         if l:
             l.release()
         else:
             try:
                 st = vfs.lstat(name)
                 age = now - st[stat.ST_MTIME]
                 user = util.username(st.st_uid)
                 locker = vfs.readlock(name)
                 if b":" in locker:
                     host, pid = locker.split(b':')
                     if host == socket.gethostname():
                         locker = b'user %s, process %s' % (user or b'None', pid)
                     else:
                         locker = b'user %s, process %s, host %s' % (
                             user or b'None',
                             pid,
                             host,
                         )
                 ui.writenoi18n(b"%-6s %s (%ds)\n" % (name + b":", locker, age))
                 return 1
             except FileNotFoundError:
                 pass
 
         ui.writenoi18n(b"%-6s free\n" % (name + b":"))
         return 0
 
     held += report(repo.svfs, b"lock", repo.lock)
     held += report(repo.vfs, b"wlock", repo.wlock)
 
     return held
 
 
 @command(
     b'debugmanifestfulltextcache',
     [
         (b'', b'clear', False, _(b'clear the cache')),
         (
             b'a',
             b'add',
             [],
             _(b'add the given manifest nodes to the cache'),
             _(b'NODE'),
         ),
     ],
     b'',
 )
 def debugmanifestfulltextcache(ui, repo, add=(), **opts):
     """show, clear or amend the contents of the manifest fulltext cache"""
 
     def getcache():
         r = repo.manifestlog.getstorage(b'')
         try:
             return r._fulltextcache
         except AttributeError:
             msg = _(
                 b"Current revlog implementation doesn't appear to have a "
                 b"manifest fulltext cache\n"
             )
             raise error.Abort(msg)
 
     if opts.get('clear'):
         with repo.wlock():
             cache = getcache()
             cache.clear(clear_persisted_data=True)
             return
 
     if add:
         with repo.wlock():
             m = repo.manifestlog
             store = m.getstorage(b'')
             for n in add:
                 try:
                     manifest = m[store.lookup(n)]
                 except error.LookupError as e:
                     raise error.Abort(
                         bytes(e), hint=b"Check your manifest node id"
                     )
                 manifest.read()  # stores revisision in cache too
             return
 
     cache = getcache()
     if not len(cache):
         ui.write(_(b'cache empty\n'))
     else:
         ui.write(
             _(
                 b'cache contains %d manifest entries, in order of most to '
                 b'least recent:\n'
             )
             % (len(cache),)
         )
         totalsize = 0
         for nodeid in cache:
             # Use cache.get to not update the LRU order
             data = cache.peek(nodeid)
             size = len(data)
             totalsize += size + 24  # 20 bytes nodeid, 4 bytes size
             ui.write(
                 _(b'id: %s, size %s\n') % (hex(nodeid), util.bytecount(size))
             )
         ondisk = cache._opener.stat(b'manifestfulltextcache').st_size
         ui.write(
             _(b'total cache data size %s, on-disk %s\n')
             % (util.bytecount(totalsize), util.bytecount(ondisk))
         )
 
 
 @command(b'debugmergestate', [] + cmdutil.templateopts, b'')
 def debugmergestate(ui, repo, *args, **opts):
     """print merge state
 
     Use --verbose to print out information about whether v1 or v2 merge state
     was chosen."""
 
     if ui.verbose:
         ms = mergestatemod.mergestate(repo)
 
         # sort so that reasonable information is on top
         v1records = ms._readrecordsv1()
         v2records = ms._readrecordsv2()
 
         if not v1records and not v2records:
             pass
         elif not v2records:
             ui.writenoi18n(b'no version 2 merge state\n')
         elif ms._v1v2match(v1records, v2records):
             ui.writenoi18n(b'v1 and v2 states match: using v2\n')
         else:
             ui.writenoi18n(b'v1 and v2 states mismatch: using v1\n')
 
     opts = pycompat.byteskwargs(opts)
     if not opts[b'template']:
         opts[b'template'] = (
             b'{if(commits, "", "no merge state found\n")}'
             b'{commits % "{name}{if(label, " ({label})")}: {node}\n"}'
             b'{files % "file: {path} (state \\"{state}\\")\n'
             b'{if(local_path, "'
             b'  local path: {local_path} (hash {local_key}, flags \\"{local_flags}\\")\n'
             b'  ancestor path: {ancestor_path} (node {ancestor_node})\n'
             b'  other path: {other_path} (node {other_node})\n'
             b'")}'
             b'{if(rename_side, "'
             b'  rename side: {rename_side}\n'
             b'  renamed path: {renamed_path}\n'
             b'")}'
             b'{extras % "  extra: {key} = {value}\n"}'
             b'"}'
             b'{extras % "extra: {file} ({key} = {value})\n"}'
         )
 
     ms = mergestatemod.mergestate.read(repo)
 
     fm = ui.formatter(b'debugmergestate', opts)
     fm.startitem()
 
     fm_commits = fm.nested(b'commits')
     if ms.active():
         for name, node, label_index in (
             (b'local', ms.local, 0),
             (b'other', ms.other, 1),
         ):
             fm_commits.startitem()
             fm_commits.data(name=name)
             fm_commits.data(node=hex(node))
             if ms._labels and len(ms._labels) > label_index:
                 fm_commits.data(label=ms._labels[label_index])
     fm_commits.end()
 
     fm_files = fm.nested(b'files')
     if ms.active():
         for f in ms:
             fm_files.startitem()
             fm_files.data(path=f)
             state = ms._state[f]
             fm_files.data(state=state[0])
             if state[0] in (
                 mergestatemod.MERGE_RECORD_UNRESOLVED,
                 mergestatemod.MERGE_RECORD_RESOLVED,
             ):
                 fm_files.data(local_key=state[1])
                 fm_files.data(local_path=state[2])
                 fm_files.data(ancestor_path=state[3])
                 fm_files.data(ancestor_node=state[4])
                 fm_files.data(other_path=state[5])
                 fm_files.data(other_node=state[6])
                 fm_files.data(local_flags=state[7])
             elif state[0] in (
                 mergestatemod.MERGE_RECORD_UNRESOLVED_PATH,
                 mergestatemod.MERGE_RECORD_RESOLVED_PATH,
             ):
                 fm_files.data(renamed_path=state[1])
                 fm_files.data(rename_side=state[2])
             fm_extras = fm_files.nested(b'extras')
             for k, v in sorted(ms.extras(f).items()):
                 fm_extras.startitem()
                 fm_extras.data(key=k)
                 fm_extras.data(value=v)
             fm_extras.end()
 
     fm_files.end()
 
     fm_extras = fm.nested(b'extras')
     for f, d in sorted(ms.allextras().items()):
         if f in ms:
             # If file is in mergestate, we have already processed it's extras
             continue
         for k, v in d.items():
             fm_extras.startitem()
             fm_extras.data(file=f)
             fm_extras.data(key=k)
             fm_extras.data(value=v)
     fm_extras.end()
 
     fm.end()
 
 
 @command(b'debugnamecomplete', [], _(b'NAME...'))
 def debugnamecomplete(ui, repo, *args):
     '''complete "names" - tags, open branch names, bookmark names'''
 
     names = set()
     # since we previously only listed open branches, we will handle that
     # specially (after this for loop)
     for name, ns in repo.names.items():
         if name != b'branches':
             names.update(ns.listnames(repo))
     names.update(
         tag
         for (tag, heads, tip, closed) in repo.branchmap().iterbranches()
         if not closed
     )
     completions = set()
     if not args:
         args = [b'']
     for a in args:
         completions.update(n for n in names if n.startswith(a))
     ui.write(b'\n'.join(sorted(completions)))
     ui.write(b'\n')
 
 
 @command(
     b'debugnodemap',
     [
         (
             b'',
             b'dump-new',
             False,
             _(b'write a (new) persistent binary nodemap on stdout'),
         ),
         (b'', b'dump-disk', False, _(b'dump on-disk data on stdout')),
         (
             b'',
             b'check',
             False,
             _(b'check that the data on disk data are correct.'),
         ),
         (
             b'',
             b'metadata',
             False,
             _(b'display the on disk meta data for the nodemap'),
         ),
     ],
 )
 def debugnodemap(ui, repo, **opts):
     """write and inspect on disk nodemap"""
     if opts['dump_new']:
         unfi = repo.unfiltered()
         cl = unfi.changelog
         if util.safehasattr(cl.index, "nodemap_data_all"):
             data = cl.index.nodemap_data_all()
         else:
             data = nodemap.persistent_data(cl.index)
         ui.write(data)
     elif opts['dump_disk']:
         unfi = repo.unfiltered()
         cl = unfi.changelog
         nm_data = nodemap.persisted_data(cl)
         if nm_data is not None:
             docket, data = nm_data
             ui.write(data[:])
     elif opts['check']:
         unfi = repo.unfiltered()
         cl = unfi.changelog
         nm_data = nodemap.persisted_data(cl)
         if nm_data is not None:
             docket, data = nm_data
             return nodemap.check_data(ui, cl.index, data)
     elif opts['metadata']:
         unfi = repo.unfiltered()
         cl = unfi.changelog
         nm_data = nodemap.persisted_data(cl)
         if nm_data is not None:
             docket, data = nm_data
             ui.write((b"uid: %s\n") % docket.uid)
             ui.write((b"tip-rev: %d\n") % docket.tip_rev)
             ui.write((b"tip-node: %s\n") % hex(docket.tip_node))
             ui.write((b"data-length: %d\n") % docket.data_length)
             ui.write((b"data-unused: %d\n") % docket.data_unused)
             unused_perc = docket.data_unused * 100.0 / docket.data_length
             ui.write((b"data-unused: %2.3f%%\n") % unused_perc)
 
 
 @command(
     b'debugobsolete',
     [
         (b'', b'flags', 0, _(b'markers flag')),
         (
             b'',
             b'record-parents',
             False,
             _(b'record parent information for the precursor'),
         ),
         (b'r', b'rev', [], _(b'display markers relevant to REV')),
         (
             b'',
             b'exclusive',
             False,
             _(b'restrict display to markers only relevant to REV'),
         ),
         (b'', b'index', False, _(b'display index of the marker')),
         (b'', b'delete', [], _(b'delete markers specified by indices')),
     ]
     + cmdutil.commitopts2
     + cmdutil.formatteropts,
     _(b'[OBSOLETED [REPLACEMENT ...]]'),
 )
 def debugobsolete(ui, repo, precursor=None, *successors, **opts):
     """create arbitrary obsolete marker
 
     With no arguments, displays the list of obsolescence markers."""
 
     opts = pycompat.byteskwargs(opts)
 
     def parsenodeid(s):
         try:
             # We do not use revsingle/revrange functions here to accept
             # arbitrary node identifiers, possibly not present in the
             # local repository.
             n = bin(s)
             if len(n) != repo.nodeconstants.nodelen:
                 raise ValueError
             return n
         except ValueError:
             raise error.InputError(
                 b'changeset references must be full hexadecimal '
                 b'node identifiers'
             )
 
     if opts.get(b'delete'):
         indices = []
         for v in opts.get(b'delete'):
             try:
                 indices.append(int(v))
             except ValueError:
                 raise error.InputError(
                     _(b'invalid index value: %r') % v,
                     hint=_(b'use integers for indices'),
                 )
 
         if repo.currenttransaction():
             raise error.Abort(
                 _(b'cannot delete obsmarkers in the middle of transaction.')
             )
 
         with repo.lock():
             n = repair.deleteobsmarkers(repo.obsstore, indices)
             ui.write(_(b'deleted %i obsolescence markers\n') % n)
 
         return
 
     if precursor is not None:
         if opts[b'rev']:
             raise error.InputError(
                 b'cannot select revision when creating marker'
             )
         metadata = {}
         metadata[b'user'] = encoding.fromlocal(opts[b'user'] or ui.username())
         succs = tuple(parsenodeid(succ) for succ in successors)
         l = repo.lock()
         try:
             tr = repo.transaction(b'debugobsolete')
             try:
                 date = opts.get(b'date')
                 if date:
                     date = dateutil.parsedate(date)
                 else:
                     date = None
                 prec = parsenodeid(precursor)
                 parents = None
                 if opts[b'record_parents']:
                     if prec not in repo.unfiltered():
                         raise error.Abort(
                             b'cannot used --record-parents on '
                             b'unknown changesets'
                         )
                     parents = repo.unfiltered()[prec].parents()
                     parents = tuple(p.node() for p in parents)
                 repo.obsstore.create(
                     tr,
                     prec,
                     succs,
                     opts[b'flags'],
                     parents=parents,
                     date=date,
                     metadata=metadata,
                     ui=ui,
                 )
                 tr.close()
             except ValueError as exc:
                 raise error.Abort(
                     _(b'bad obsmarker input: %s') % stringutil.forcebytestr(exc)
                 )
             finally:
                 tr.release()
         finally:
             l.release()
     else:
         if opts[b'rev']:
             revs = logcmdutil.revrange(repo, opts[b'rev'])
             nodes = [repo[r].node() for r in revs]
             markers = list(
                 obsutil.getmarkers(
                     repo, nodes=nodes, exclusive=opts[b'exclusive']
                 )
             )
             markers.sort(key=lambda x: x._data)
         else:
             markers = obsutil.getmarkers(repo)
 
         markerstoiter = markers
         isrelevant = lambda m: True
         if opts.get(b'rev') and opts.get(b'index'):
             markerstoiter = obsutil.getmarkers(repo)
             markerset = set(markers)
             isrelevant = lambda m: m in markerset
 
         fm = ui.formatter(b'debugobsolete', opts)
         for i, m in enumerate(markerstoiter):
             if not isrelevant(m):
                 # marker can be irrelevant when we're iterating over a set
                 # of markers (markerstoiter) which is bigger than the set
                 # of markers we want to display (markers)
                 # this can happen if both --index and --rev options are
                 # provided and thus we need to iterate over all of the markers
                 # to get the correct indices, but only display the ones that
                 # are relevant to --rev value
                 continue
             fm.startitem()
             ind = i if opts.get(b'index') else None
             cmdutil.showmarker(fm, m, index=ind)
         fm.end()
 
 
 @command(
     b'debugp1copies',
     [(b'r', b'rev', b'', _(b'revision to debug'), _(b'REV'))],
     _(b'[-r REV]'),
 )
 def debugp1copies(ui, repo, **opts):
     """dump copy information compared to p1"""
 
     opts = pycompat.byteskwargs(opts)
     ctx = scmutil.revsingle(repo, opts.get(b'rev'), default=None)
     for dst, src in ctx.p1copies().items():
         ui.write(b'%s -> %s\n' % (src, dst))
 
 
 @command(
     b'debugp2copies',
     [(b'r', b'rev', b'', _(b'revision to debug'), _(b'REV'))],
     _(b'[-r REV]'),
 )
 def debugp2copies(ui, repo, **opts):
     """dump copy information compared to p2"""
 
     opts = pycompat.byteskwargs(opts)
     ctx = scmutil.revsingle(repo, opts.get(b'rev'), default=None)
     for dst, src in ctx.p2copies().items():
         ui.write(b'%s -> %s\n' % (src, dst))
 
 
 @command(
     b'debugpathcomplete',
     [
         (b'f', b'full', None, _(b'complete an entire path')),
         (b'n', b'normal', None, _(b'show only normal files')),
         (b'a', b'added', None, _(b'show only added files')),
         (b'r', b'removed', None, _(b'show only removed files')),
     ],
     _(b'FILESPEC...'),
 )
 def debugpathcomplete(ui, repo, *specs, **opts):
     """complete part or all of a tracked path
 
     This command supports shells that offer path name completion. It
     currently completes only files already known to the dirstate.
 
     Completion extends only to the next path segment unless
     --full is specified, in which case entire paths are used."""
 
     def complete(path, acceptable):
         dirstate = repo.dirstate
         spec = os.path.normpath(os.path.join(encoding.getcwd(), path))
         rootdir = repo.root + pycompat.ossep
         if spec != repo.root and not spec.startswith(rootdir):
             return [], []
         if os.path.isdir(spec):
             spec += b'/'
         spec = spec[len(rootdir) :]
         fixpaths = pycompat.ossep != b'/'
         if fixpaths:
             spec = spec.replace(pycompat.ossep, b'/')
         speclen = len(spec)
         fullpaths = opts['full']
         files, dirs = set(), set()
         adddir, addfile = dirs.add, files.add
         for f, st in dirstate.items():
             if f.startswith(spec) and st.state in acceptable:
                 if fixpaths:
                     f = f.replace(b'/', pycompat.ossep)
                 if fullpaths:
                     addfile(f)
                     continue
                 s = f.find(pycompat.ossep, speclen)
                 if s >= 0:
                     adddir(f[:s])
                 else:
                     addfile(f)
         return files, dirs
 
     acceptable = b''
     if opts['normal']:
         acceptable += b'nm'
     if opts['added']:
         acceptable += b'a'
     if opts['removed']:
         acceptable += b'r'
     cwd = repo.getcwd()
     if not specs:
         specs = [b'.']
 
     files, dirs = set(), set()
     for spec in specs:
         f, d = complete(spec, acceptable or b'nmar')
         files.update(f)
         dirs.update(d)
     files.update(dirs)
     ui.write(b'\n'.join(repo.pathto(p, cwd) for p in sorted(files)))
     ui.write(b'\n')
 
 
 @command(
     b'debugpathcopies',
     cmdutil.walkopts,
     b'hg debugpathcopies REV1 REV2 [FILE]',
     inferrepo=True,
 )
 def debugpathcopies(ui, repo, rev1, rev2, *pats, **opts):
     """show copies between two revisions"""
     ctx1 = scmutil.revsingle(repo, rev1)
     ctx2 = scmutil.revsingle(repo, rev2)
     m = scmutil.match(ctx1, pats, opts)
     for dst, src in sorted(copies.pathcopies(ctx1, ctx2, m).items()):
         ui.write(b'%s -> %s\n' % (src, dst))
 
 
 @command(b'debugpeer', [], _(b'PATH'), norepo=True)
 def debugpeer(ui, path):
     """establish a connection to a peer repository"""
     # Always enable peer request logging. Requires --debug to display
     # though.
     overrides = {
         (b'devel', b'debug.peer-request'): True,
     }
 
     with ui.configoverride(overrides):
         peer = hg.peer(ui, {}, path)
 
         try:
             local = peer.local() is not None
             canpush = peer.canpush()
 
             ui.write(_(b'url: %s\n') % peer.url())
             ui.write(_(b'local: %s\n') % (_(b'yes') if local else _(b'no')))
             ui.write(
                 _(b'pushable: %s\n') % (_(b'yes') if canpush else _(b'no'))
             )
         finally:
             peer.close()
 
 
 @command(
     b'debugpickmergetool',
     [
         (b'r', b'rev', b'', _(b'check for files in this revision'), _(b'REV')),
         (b'', b'changedelete', None, _(b'emulate merging change and delete')),
     ]
     + cmdutil.walkopts
     + cmdutil.mergetoolopts,
     _(b'[PATTERN]...'),
     inferrepo=True,
 )
 def debugpickmergetool(ui, repo, *pats, **opts):
     """examine which merge tool is chosen for specified file
 
     As described in :hg:`help merge-tools`, Mercurial examines
     configurations below in this order to decide which merge tool is
     chosen for specified file.
 
     1. ``--tool`` option
     2. ``HGMERGE`` environment variable
     3. configurations in ``merge-patterns`` section
     4. configuration of ``ui.merge``
     5. configurations in ``merge-tools`` section
     6. ``hgmerge`` tool (for historical reason only)
     7. default tool for fallback (``:merge`` or ``:prompt``)
 
     This command writes out examination result in the style below::
 
         FILE = MERGETOOL
 
     By default, all files known in the first parent context of the
     working directory are examined. Use file patterns and/or -I/-X
     options to limit target files. -r/--rev is also useful to examine
     files in another context without actual updating to it.
 
     With --debug, this command shows warning messages while matching
     against ``merge-patterns`` and so on, too. It is recommended to
     use this option with explicit file patterns and/or -I/-X options,
     because this option increases amount of output per file according
     to configurations in hgrc.
 
     With -v/--verbose, this command shows configurations below at
     first (only if specified).
 
     - ``--tool`` option
     - ``HGMERGE`` environment variable
     - configuration of ``ui.merge``
 
     If merge tool is chosen before matching against
     ``merge-patterns``, this command can't show any helpful
     information, even with --debug. In such case, information above is
     useful to know why a merge tool is chosen.
     """
     opts = pycompat.byteskwargs(opts)
     overrides = {}
     if opts[b'tool']:
         overrides[(b'ui', b'forcemerge')] = opts[b'tool']
         ui.notenoi18n(b'with --tool %r\n' % (pycompat.bytestr(opts[b'tool'])))
 
     with ui.configoverride(overrides, b'debugmergepatterns'):
         hgmerge = encoding.environ.get(b"HGMERGE")
         if hgmerge is not None:
             ui.notenoi18n(b'with HGMERGE=%r\n' % (pycompat.bytestr(hgmerge)))
         uimerge = ui.config(b"ui", b"merge")
         if uimerge:
             ui.notenoi18n(b'with ui.merge=%r\n' % (pycompat.bytestr(uimerge)))
 
         ctx = scmutil.revsingle(repo, opts.get(b'rev'))
         m = scmutil.match(ctx, pats, opts)
         changedelete = opts[b'changedelete']
         for path in ctx.walk(m):
             fctx = ctx[path]
             with ui.silent(
                 error=True
             ) if not ui.debugflag else util.nullcontextmanager():
                 tool, toolpath = filemerge._picktool(
                     repo,
                     ui,
                     path,
                     fctx.isbinary(),
                     b'l' in fctx.flags(),
                     changedelete,
                 )
             ui.write(b'%s = %s\n' % (path, tool))
 
 
 @command(b'debugpushkey', [], _(b'REPO NAMESPACE [KEY OLD NEW]'), norepo=True)
 def debugpushkey(ui, repopath, namespace, *keyinfo, **opts):
     """access the pushkey key/value protocol
 
     With two args, list the keys in the given namespace.
 
     With five args, set a key to new if it currently is set to old.
     Reports success or failure.
     """
 
     target = hg.peer(ui, {}, repopath)
     try:
         if keyinfo:
             key, old, new = keyinfo
             with target.commandexecutor() as e:
                 r = e.callcommand(
                     b'pushkey',
                     {
                         b'namespace': namespace,
                         b'key': key,
                         b'old': old,
                         b'new': new,
                     },
                 ).result()
 
             ui.status(pycompat.bytestr(r) + b'\n')
             return not r
         else:
             for k, v in sorted(target.listkeys(namespace).items()):
                 ui.write(
                     b"%s\t%s\n"
                     % (stringutil.escapestr(k), stringutil.escapestr(v))
                 )
     finally:
         target.close()
 
 
 @command(b'debugpvec', [], _(b'A B'))
 def debugpvec(ui, repo, a, b=None):
     ca = scmutil.revsingle(repo, a)
     cb = scmutil.revsingle(repo, b)
     pa = pvec.ctxpvec(ca)
     pb = pvec.ctxpvec(cb)
     if pa == pb:
         rel = b"="
     elif pa > pb:
         rel = b">"
     elif pa < pb:
         rel = b"<"
     elif pa | pb:
         rel = b"|"
     ui.write(_(b"a: %s\n") % pa)
     ui.write(_(b"b: %s\n") % pb)
     ui.write(_(b"depth(a): %d depth(b): %d\n") % (pa._depth, pb._depth))
     ui.write(
         _(b"delta: %d hdist: %d distance: %d relation: %s\n")
         % (
             abs(pa._depth - pb._depth),
             pvec._hamming(pa._vec, pb._vec),
             pa.distance(pb),
             rel,
         )
     )
 
 
 @command(
     b'debugrebuilddirstate|debugrebuildstate',
     [
         (b'r', b'rev', b'', _(b'revision to rebuild to'), _(b'REV')),
         (
             b'',
             b'minimal',
             None,
             _(
                 b'only rebuild files that are inconsistent with '
                 b'the working copy parent'
             ),
         ),
     ],
     _(b'[-r REV]'),
 )
 def debugrebuilddirstate(ui, repo, rev, **opts):
     """rebuild the dirstate as it would look like for the given revision
 
     If no revision is specified the first current parent will be used.
 
     The dirstate will be set to the files of the given revision.
     The actual working directory content or existing dirstate
     information such as adds or removes is not considered.
 
     ``minimal`` will only rebuild the dirstate status for files that claim to be
     tracked but are not in the parent manifest, or that exist in the parent
     manifest but are not in the dirstate. It will not change adds, removes, or
     modified files that are in the working copy parent.
 
     One use of this command is to make the next :hg:`status` invocation
     check the actual file content.
     """
     ctx = scmutil.revsingle(repo, rev)
     with repo.wlock():
         if repo.currenttransaction() is not None:
             msg = b'rebuild the dirstate outside of a transaction'
             raise error.ProgrammingError(msg)
         dirstate = repo.dirstate
         changedfiles = None
         # See command doc for what minimal does.
         if opts.get('minimal'):
             manifestfiles = set(ctx.manifest().keys())
             dirstatefiles = set(dirstate)
             manifestonly = manifestfiles - dirstatefiles
             dsonly = dirstatefiles - manifestfiles
             dsnotadded = {f for f in dsonly if not dirstate.get_entry(f).added}
             changedfiles = manifestonly | dsnotadded
 
         with dirstate.changing_parents(repo):
             dirstate.rebuild(ctx.node(), ctx.manifest(), changedfiles)
 
 
 @command(
     b'debugrebuildfncache',
     [
         (
             b'',
             b'only-data',
             False,
             _(b'only look for wrong .d files (much faster)'),
         )
     ],
     b'',
 )
 def debugrebuildfncache(ui, repo, **opts):
     """rebuild the fncache file"""
     opts = pycompat.byteskwargs(opts)
     repair.rebuildfncache(ui, repo, opts.get(b"only_data"))
 
 
 @command(
     b'debugrename',
     [(b'r', b'rev', b'', _(b'revision to debug'), _(b'REV'))],
     _(b'[-r REV] [FILE]...'),
 )
 def debugrename(ui, repo, *pats, **opts):
     """dump rename information"""
 
     opts = pycompat.byteskwargs(opts)
     ctx = scmutil.revsingle(repo, opts.get(b'rev'))
     m = scmutil.match(ctx, pats, opts)
     for abs in ctx.walk(m):
         fctx = ctx[abs]
         o = fctx.filelog().renamed(fctx.filenode())
         rel = repo.pathto(abs)
         if o:
             ui.write(_(b"%s renamed from %s:%s\n") % (rel, o[0], hex(o[1])))
         else:
             ui.write(_(b"%s not renamed\n") % rel)
 
 
 @command(b'debugrequires|debugrequirements', [], b'')
 def debugrequirements(ui, repo):
     """print the current repo requirements"""
     for r in sorted(repo.requirements):
         ui.write(b"%s\n" % r)
 
 
 @command(
     b'debugrevlog',
     cmdutil.debugrevlogopts + [(b'd', b'dump', False, _(b'dump index data'))],
     _(b'-c|-m|FILE'),
     optionalrepo=True,
 )
 def debugrevlog(ui, repo, file_=None, **opts):
     """show data and statistics about a revlog"""
     opts = pycompat.byteskwargs(opts)
     r = cmdutil.openrevlog(repo, b'debugrevlog', file_, opts)
 
     if opts.get(b"dump"):
         revlog_debug.dump(ui, r)
     else:
         revlog_debug.debug_revlog(ui, r)
     return 0
 
 
 @command(
     b'debugrevlogindex',
     cmdutil.debugrevlogopts
     + [(b'f', b'format', 0, _(b'revlog format'), _(b'FORMAT'))],
     _(b'[-f FORMAT] -c|-m|FILE'),
     optionalrepo=True,
 )
 def debugrevlogindex(ui, repo, file_=None, **opts):
     """dump the contents of a revlog index"""
     opts = pycompat.byteskwargs(opts)
     r = cmdutil.openrevlog(repo, b'debugrevlogindex', file_, opts)
     format = opts.get(b'format', 0)
     if format not in (0, 1):
         raise error.Abort(_(b"unknown format %d") % format)
 
     if ui.debugflag:
         shortfn = hex
     else:
         shortfn = short
 
     # There might not be anything in r, so have a sane default
     idlen = 12
     for i in r:
         idlen = len(shortfn(r.node(i)))
         break
 
     if format == 0:
         if ui.verbose:
             ui.writenoi18n(
                 b"   rev    offset  length linkrev %s %s p2\n"
                 % (b"nodeid".ljust(idlen), b"p1".ljust(idlen))
             )
         else:
             ui.writenoi18n(
                 b"   rev linkrev %s %s p2\n"
                 % (b"nodeid".ljust(idlen), b"p1".ljust(idlen))
             )
     elif format == 1:
         if ui.verbose:
             ui.writenoi18n(
                 (
                     b"   rev flag   offset   length     size   link     p1"
                     b"     p2 %s\n"
                 )
                 % b"nodeid".rjust(idlen)
             )
         else:
             ui.writenoi18n(
                 b"   rev flag     size   link     p1     p2 %s\n"
                 % b"nodeid".rjust(idlen)
             )
 
     for i in r:
         node = r.node(i)
         if format == 0:
             try:
                 pp = r.parents(node)
             except Exception:
                 pp = [repo.nullid, repo.nullid]
             if ui.verbose:
                 ui.write(
                     b"% 6d % 9d % 7d % 7d %s %s %s\n"
                     % (
                         i,
                         r.start(i),
                         r.length(i),
                         r.linkrev(i),
                         shortfn(node),
                         shortfn(pp[0]),
                         shortfn(pp[1]),
                     )
                 )
             else:
                 ui.write(
                     b"% 6d % 7d %s %s %s\n"
                     % (
                         i,
                         r.linkrev(i),
                         shortfn(node),
                         shortfn(pp[0]),
                         shortfn(pp[1]),
                     )
                 )
         elif format == 1:
             pr = r.parentrevs(i)
             if ui.verbose:
                 ui.write(
                     b"% 6d %04x % 8d % 8d % 8d % 6d % 6d % 6d %s\n"
                     % (
                         i,
                         r.flags(i),
                         r.start(i),
                         r.length(i),
                         r.rawsize(i),
                         r.linkrev(i),
                         pr[0],
                         pr[1],
                         shortfn(node),
                     )
                 )
             else:
                 ui.write(
                     b"% 6d %04x % 8d % 6d % 6d % 6d %s\n"
                     % (
                         i,
                         r.flags(i),
                         r.rawsize(i),
                         r.linkrev(i),
                         pr[0],
                         pr[1],
                         shortfn(node),
                     )
                 )
 
 
 @command(
     b'debugrevspec',
     [
         (
             b'',
             b'optimize',
             None,
             _(b'print parsed tree after optimizing (DEPRECATED)'),
         ),
         (
             b'',
             b'show-revs',
             True,
             _(b'print list of result revisions (default)'),
         ),
         (
             b's',
             b'show-set',
             None,
             _(b'print internal representation of result set'),
         ),
         (
             b'p',
             b'show-stage',
             [],
             _(b'print parsed tree at the given stage'),
             _(b'NAME'),
         ),
         (b'', b'no-optimized', False, _(b'evaluate tree without optimization')),
         (b'', b'verify-optimized', False, _(b'verify optimized result')),
     ],
     b'REVSPEC',
 )
 def debugrevspec(ui, repo, expr, **opts):
     """parse and apply a revision specification
 
     Use -p/--show-stage option to print the parsed tree at the given stages.
     Use -p all to print tree at every stage.
 
     Use --no-show-revs option with -s or -p to print only the set
     representation or the parsed tree respectively.
 
     Use --verify-optimized to compare the optimized result with the unoptimized
     one. Returns 1 if the optimized result differs.
     """
     opts = pycompat.byteskwargs(opts)
     aliases = ui.configitems(b'revsetalias')
     stages = [
         (b'parsed', lambda tree: tree),
         (
             b'expanded',
             lambda tree: revsetlang.expandaliases(tree, aliases, ui.warn),
         ),
         (b'concatenated', revsetlang.foldconcat),
         (b'analyzed', revsetlang.analyze),
         (b'optimized', revsetlang.optimize),
     ]
     if opts[b'no_optimized']:
         stages = stages[:-1]
     if opts[b'verify_optimized'] and opts[b'no_optimized']:
         raise error.Abort(
             _(b'cannot use --verify-optimized with --no-optimized')
         )
     stagenames = {n for n, f in stages}
 
     showalways = set()
     showchanged = set()
     if ui.verbose and not opts[b'show_stage']:
         # show parsed tree by --verbose (deprecated)
         showalways.add(b'parsed')
         showchanged.update([b'expanded', b'concatenated'])
         if opts[b'optimize']:
             showalways.add(b'optimized')
     if opts[b'show_stage'] and opts[b'optimize']:
         raise error.Abort(_(b'cannot use --optimize with --show-stage'))
     if opts[b'show_stage'] == [b'all']:
         showalways.update(stagenames)
     else:
         for n in opts[b'show_stage']:
             if n not in stagenames:
                 raise error.Abort(_(b'invalid stage name: %s') % n)
         showalways.update(opts[b'show_stage'])
 
     treebystage = {}
     printedtree = None
     tree = revsetlang.parse(expr, lookup=revset.lookupfn(repo))
     for n, f in stages:
         treebystage[n] = tree = f(tree)
         if n in showalways or (n in showchanged and tree != printedtree):
             if opts[b'show_stage'] or n != b'parsed':
                 ui.write(b"* %s:\n" % n)
             ui.write(revsetlang.prettyformat(tree), b"\n")
             printedtree = tree
 
     if opts[b'verify_optimized']:
         arevs = revset.makematcher(treebystage[b'analyzed'])(repo)
         brevs = revset.makematcher(treebystage[b'optimized'])(repo)
         if opts[b'show_set'] or (opts[b'show_set'] is None and ui.verbose):
             ui.writenoi18n(
                 b"* analyzed set:\n", stringutil.prettyrepr(arevs), b"\n"
             )
             ui.writenoi18n(
                 b"* optimized set:\n", stringutil.prettyrepr(brevs), b"\n"
             )
         arevs = list(arevs)
         brevs = list(brevs)
         if arevs == brevs:
             return 0
         ui.writenoi18n(b'--- analyzed\n', label=b'diff.file_a')
         ui.writenoi18n(b'+++ optimized\n', label=b'diff.file_b')
         sm = difflib.SequenceMatcher(None, arevs, brevs)
         for tag, alo, ahi, blo, bhi in sm.get_opcodes():
             if tag in ('delete', 'replace'):
                 for c in arevs[alo:ahi]:
                     ui.write(b'-%d\n' % c, label=b'diff.deleted')
             if tag in ('insert', 'replace'):
                 for c in brevs[blo:bhi]:
                     ui.write(b'+%d\n' % c, label=b'diff.inserted')
             if tag == 'equal':
                 for c in arevs[alo:ahi]:
                     ui.write(b' %d\n' % c)
         return 1
 
     func = revset.makematcher(tree)
     revs = func(repo)
     if opts[b'show_set'] or (opts[b'show_set'] is None and ui.verbose):
         ui.writenoi18n(b"* set:\n", stringutil.prettyrepr(revs), b"\n")
     if not opts[b'show_revs']:
         return
     for c in revs:
         ui.write(b"%d\n" % c)
 
 
 @command(
     b'debugserve',
     [
         (
             b'',
             b'sshstdio',
             False,
             _(b'run an SSH server bound to process handles'),
         ),
         (b'', b'logiofd', b'', _(b'file descriptor to log server I/O to')),
         (b'', b'logiofile', b'', _(b'file to log server I/O to')),
     ],
     b'',
 )
 def debugserve(ui, repo, **opts):
     """run a server with advanced settings
 
     This command is similar to :hg:`serve`. It exists partially as a
     workaround to the fact that ``hg serve --stdio`` must have specific
     arguments for security reasons.
     """
     opts = pycompat.byteskwargs(opts)
 
     if not opts[b'sshstdio']:
         raise error.Abort(_(b'only --sshstdio is currently supported'))
 
     logfh = None
 
     if opts[b'logiofd'] and opts[b'logiofile']:
         raise error.Abort(_(b'cannot use both --logiofd and --logiofile'))
 
     if opts[b'logiofd']:
         # Ideally we would be line buffered. But line buffering in binary
         # mode isn't supported and emits a warning in Python 3.8+. Disabling
         # buffering could have performance impacts. But since this isn't
         # performance critical code, it should be fine.
         try:
             logfh = os.fdopen(int(opts[b'logiofd']), 'ab', 0)
         except OSError as e:
             if e.errno != errno.ESPIPE:
                 raise
             # can't seek a pipe, so `ab` mode fails on py3
             logfh = os.fdopen(int(opts[b'logiofd']), 'wb', 0)
     elif opts[b'logiofile']:
         logfh = open(opts[b'logiofile'], b'ab', 0)
 
     s = wireprotoserver.sshserver(ui, repo, logfh=logfh)
     s.serve_forever()
 
 
 @command(b'debugsetparents', [], _(b'REV1 [REV2]'))
 def debugsetparents(ui, repo, rev1, rev2=None):
     """manually set the parents of the current working directory (DANGEROUS)
 
     This command is not what you are looking for and should not be used. Using
     this command will most certainly results in slight corruption of the file
     level histories withing your repository. DO NOT USE THIS COMMAND.
 
     The command update the p1 and p2 field in the dirstate, and not touching
     anything else. This useful for writing repository conversion tools, but
     should be used with extreme care. For example, neither the working
     directory nor the dirstate is updated, so file status may be incorrect
     after running this command. Only used if you are one of the few people that
     deeply unstand both conversion tools and file level histories. If you are
     reading this help, you are not one of this people (most of them sailed west
     from Mithlond anyway.
 
     So one last time DO NOT USE THIS COMMAND.
 
     Returns 0 on success.
     """
 
     node1 = scmutil.revsingle(repo, rev1).node()
     node2 = scmutil.revsingle(repo, rev2, b'null').node()
 
     with repo.wlock():
         repo.setparents(node1, node2)
 
 
 @command(b'debugsidedata', cmdutil.debugrevlogopts, _(b'-c|-m|FILE REV'))
 def debugsidedata(ui, repo, file_, rev=None, **opts):
     """dump the side data for a cl/manifest/file revision
 
     Use --verbose to dump the sidedata content."""
     opts = pycompat.byteskwargs(opts)
     if opts.get(b'changelog') or opts.get(b'manifest') or opts.get(b'dir'):
         if rev is not None:
             raise error.CommandError(b'debugdata', _(b'invalid arguments'))
         file_, rev = None, file_
     elif rev is None:
         raise error.CommandError(b'debugdata', _(b'invalid arguments'))
     r = cmdutil.openstorage(repo, b'debugdata', file_, opts)
     r = getattr(r, '_revlog', r)
     try:
         sidedata = r.sidedata(r.lookup(rev))
     except KeyError:
         raise error.Abort(_(b'invalid revision identifier %s') % rev)
     if sidedata:
         sidedata = list(sidedata.items())
         sidedata.sort()
         ui.writenoi18n(b'%d sidedata entries\n' % len(sidedata))
         for key, value in sidedata:
             ui.writenoi18n(b' entry-%04o size %d\n' % (key, len(value)))
             if ui.verbose:
                 ui.writenoi18n(b'  %s\n' % stringutil.pprint(value))
 
 
 @command(b'debugssl', [], b'[SOURCE]', optionalrepo=True)
 def debugssl(ui, repo, source=None, **opts):
     """test a secure connection to a server
 
     This builds the certificate chain for the server on Windows, installing the
     missing intermediates and trusted root via Windows Update if necessary.  It
     does nothing on other platforms.
 
     If SOURCE is omitted, the 'default' path will be used.  If a URL is given,
     that server is used. See :hg:`help urls` for more information.
 
     If the update succeeds, retry the original operation.  Otherwise, the cause
     of the SSL error is likely another issue.
     """
     if not pycompat.iswindows:
         raise error.Abort(
             _(b'certificate chain building is only possible on Windows')
         )
 
     if not source:
         if not repo:
             raise error.Abort(
                 _(
                     b"there is no Mercurial repository here, and no "
                     b"server specified"
                 )
             )
         source = b"default"
 
     path = urlutil.get_unique_pull_path_obj(b'debugssl', ui, source)
     url = path.url
 
     defaultport = {b'https': 443, b'ssh': 22}
     if url.scheme in defaultport:
         try:
             addr = (url.host, int(url.port or defaultport[url.scheme]))
         except ValueError:
             raise error.Abort(_(b"malformed port number in URL"))
     else:
         raise error.Abort(_(b"only https and ssh connections are supported"))
 
     from . import win32
 
     s = ssl.wrap_socket(
         socket.socket(),
         ssl_version=ssl.PROTOCOL_TLS,
         cert_reqs=ssl.CERT_NONE,
         ca_certs=None,
     )
 
     try:
         s.connect(addr)
         cert = s.getpeercert(True)
 
         ui.status(_(b'checking the certificate chain for %s\n') % url.host)
 
         complete = win32.checkcertificatechain(cert, build=False)
 
         if not complete:
             ui.status(_(b'certificate chain is incomplete, updating... '))
 
             if not win32.checkcertificatechain(cert):
                 ui.status(_(b'failed.\n'))
             else:
                 ui.status(_(b'done.\n'))
         else:
             ui.status(_(b'full certificate chain is available\n'))
     finally:
         s.close()
 
 
 @command(
+    b'debug::stable-tail-sort',
+    [
+        (
+            b'T',
+            b'template',
+            b'{rev}\n',
+            _(b'display with template'),
+            _(b'TEMPLATE'),
+        ),
+    ],
+    b'REV',
+)
+def debug_stable_tail_sort(ui, repo, revspec, template, **opts):
+    """display the stable-tail sort of the ancestors of a given node"""
+    rev = logcmdutil.revsingle(repo, revspec).rev()
+    cl = repo.changelog
+
+    displayer = logcmdutil.maketemplater(ui, repo, template)
+    sorted_revs = stabletailsort._stable_tail_sort(cl, rev)
+    for ancestor_rev in sorted_revs:
+        displayer.show(repo[ancestor_rev])
+
+
+@command(
     b"debugbackupbundle",
     [
         (
             b"",
             b"recover",
             b"",
             b"brings the specified changeset back into the repository",
         )
     ]
     + cmdutil.logopts,
     _(b"hg debugbackupbundle [--recover HASH]"),
 )
 def debugbackupbundle(ui, repo, *pats, **opts):
     """lists the changesets available in backup bundles
 
     Without any arguments, this command prints a list of the changesets in each
     backup bundle.
 
     --recover takes a changeset hash and unbundles the first bundle that
     contains that hash, which puts that changeset back in your repository.
 
     --verbose will print the entire commit message and the bundle path for that
     backup.
     """
     backups = list(
         filter(
             os.path.isfile, glob.glob(repo.vfs.join(b"strip-backup") + b"/*.hg")
         )
     )
     backups.sort(key=lambda x: os.path.getmtime(x), reverse=True)
 
     opts = pycompat.byteskwargs(opts)
     opts[b"bundle"] = b""
     opts[b"force"] = None
     limit = logcmdutil.getlimit(opts)
 
     def display(other, chlist, displayer):
         if opts.get(b"newest_first"):
             chlist.reverse()
         count = 0
         for n in chlist:
             if limit is not None and count >= limit:
                 break
             parents = [
                 True for p in other.changelog.parents(n) if p != repo.nullid
             ]
             if opts.get(b"no_merges") and len(parents) == 2:
                 continue
             count += 1
             displayer.show(other[n])
 
     recovernode = opts.get(b"recover")
     if recovernode:
         if scmutil.isrevsymbol(repo, recovernode):
             ui.warn(_(b"%s already exists in the repo\n") % recovernode)
             return
     elif backups:
         msg = _(
             b"Recover changesets using: hg debugbackupbundle --recover "
             b"<changeset hash>\n\nAvailable backup changesets:"
         )
         ui.status(msg, label=b"status.removed")
     else:
         ui.status(_(b"no backup changesets found\n"))
         return
 
     for backup in backups:
         # Much of this is copied from the hg incoming logic
         source = os.path.relpath(backup, encoding.getcwd())
         path = urlutil.get_unique_pull_path_obj(
             b'debugbackupbundle',
             ui,
             source,
         )
         try:
             other = hg.peer(repo, opts, path)
         except error.LookupError as ex:
             msg = _(b"\nwarning: unable to open bundle %s") % path.loc
             hint = _(b"\n(missing parent rev %s)\n") % short(ex.name)
             ui.warn(msg, hint=hint)
             continue
         branches = (path.branch, opts.get(b'branch', []))
         revs, checkout = hg.addbranchrevs(
             repo, other, branches, opts.get(b"rev")
         )
 
         if revs:
             revs = [other.lookup(rev) for rev in revs]
 
         with ui.silent():
             try:
                 other, chlist, cleanupfn = bundlerepo.getremotechanges(
                     ui, repo, other, revs, opts[b"bundle"], opts[b"force"]
                 )
             except error.LookupError:
                 continue
 
         try:
             if not chlist:
                 continue
             if recovernode:
                 with repo.lock(), repo.transaction(b"unbundle") as tr:
                     if scmutil.isrevsymbol(other, recovernode):
                         ui.status(_(b"Unbundling %s\n") % (recovernode))
                         f = hg.openpath(ui, path.loc)
                         gen = exchange.readbundle(ui, f, path.loc)
                         if isinstance(gen, bundle2.unbundle20):
                             bundle2.applybundle(
                                 repo,
                                 gen,
                                 tr,
                                 source=b"unbundle",
                                 url=b"bundle:" + path.loc,
                             )
                         else:
                             gen.apply(repo, b"unbundle", b"bundle:" + path.loc)
                         break
             else:
                 backupdate = encoding.strtolocal(
                     time.strftime(
                         "%a %H:%M, %Y-%m-%d",
                         time.localtime(os.path.getmtime(path.loc)),
                     )
                 )
                 ui.status(b"\n%s\n" % (backupdate.ljust(50)))
                 if ui.verbose:
                     ui.status(b"%s%s\n" % (b"bundle:".ljust(13), path.loc))
                 else:
                     opts[
                         b"template"
                     ] = b"{label('status.modified', node|short)} {desc|firstline}\n"
                 displayer = logcmdutil.changesetdisplayer(
                     ui, other, opts, False
                 )
                 display(other, chlist, displayer)
                 displayer.close()
         finally:
             cleanupfn()
 
 
 @command(
     b'debugsub',
     [(b'r', b'rev', b'', _(b'revision to check'), _(b'REV'))],
     _(b'[-r REV] [REV]'),
 )
 def debugsub(ui, repo, rev=None):
     ctx = scmutil.revsingle(repo, rev, None)
     for k, v in sorted(ctx.substate.items()):
         ui.writenoi18n(b'path %s\n' % k)
         ui.writenoi18n(b' source   %s\n' % v[0])
         ui.writenoi18n(b' revision %s\n' % v[1])
 
 
 @command(
     b'debugshell',
     [
         (
             b'c',
             b'command',
             b'',
             _(b'program passed in as a string'),
             _(b'COMMAND'),
         )
     ],
     _(b'[-c COMMAND]'),
     optionalrepo=True,
 )
 def debugshell(ui, repo, **opts):
     """run an interactive Python interpreter
 
     The local namespace is provided with a reference to the ui and
     the repo instance (if available).
     """
     import code
 
     imported_objects = {
         'ui': ui,
         'repo': repo,
     }
 
     # py2exe disables initialization of the site module, which is responsible
     # for arranging for ``quit()`` to exit the interpreter.  Manually initialize
     # the stuff that site normally does here, so that the interpreter can be
     # quit in a consistent manner, whether run with pyoxidizer, exewrapper.c,
     # py.exe, or py2exe.
     if getattr(sys, "frozen", None) == 'console_exe':
         try:
             import site
 
             site.setcopyright()
             site.sethelper()
             site.setquit()
         except ImportError:
             site = None  # Keep PyCharm happy
 
     command = opts.get('command')
     if command:
         compiled = code.compile_command(encoding.strfromlocal(command))
         code.InteractiveInterpreter(locals=imported_objects).runcode(compiled)
         return
 
     code.interact(local=imported_objects)
 
 
 @command(
     b'debug-revlog-stats',
     [
         (b'c', b'changelog', None, _(b'Display changelog statistics')),
         (b'm', b'manifest', None, _(b'Display manifest statistics')),
         (b'f', b'filelogs', None, _(b'Display filelogs statistics')),
     ]
     + cmdutil.formatteropts,
 )
 def debug_revlog_stats(ui, repo, **opts):
     """display statistics about revlogs in the store"""
     opts = pycompat.byteskwargs(opts)
     changelog = opts[b"changelog"]
     manifest = opts[b"manifest"]
     filelogs = opts[b"filelogs"]
 
     if changelog is None and manifest is None and filelogs is None:
         changelog = True
         manifest = True
         filelogs = True
 
     repo = repo.unfiltered()
     fm = ui.formatter(b'debug-revlog-stats', opts)
     revlog_debug.debug_revlog_stats(repo, fm, changelog, manifest, filelogs)
     fm.end()
 
 
 @command(
     b'debugsuccessorssets',
     [(b'', b'closest', False, _(b'return closest successors sets only'))],
     _(b'[REV]'),
 )
 def debugsuccessorssets(ui, repo, *revs, **opts):
     """show set of successors for revision
 
     A successors set of changeset A is a consistent group of revisions that
     succeed A. It contains non-obsolete changesets only unless closests
     successors set is set.
 
     In most cases a changeset A has a single successors set containing a single
     successor (changeset A replaced by A').
 
     A changeset that is made obsolete with no successors are called "pruned".
     Such changesets have no successors sets at all.
 
     A changeset that has been "split" will have a successors set containing
     more than one successor.
 
     A changeset that has been rewritten in multiple different ways is called
     "divergent". Such changesets have multiple successor sets (each of which
     may also be split, i.e. have multiple successors).
 
     Results are displayed as follows::
 
         <rev1>
             <successors-1A>
         <rev2>
             <successors-2A>
             <successors-2B1> <successors-2B2> <successors-2B3>
 
     Here rev2 has two possible (i.e. divergent) successors sets. The first
     holds one element, whereas the second holds three (i.e. the changeset has
     been split).
     """
     # passed to successorssets caching computation from one call to another
     cache = {}
     ctx2str = bytes
     node2str = short
     for rev in logcmdutil.revrange(repo, revs):
         ctx = repo[rev]
         ui.write(b'%s\n' % ctx2str(ctx))
         for succsset in obsutil.successorssets(
             repo, ctx.node(), closest=opts['closest'], cache=cache
         ):
             if succsset:
                 ui.write(b'    ')
                 ui.write(node2str(succsset[0]))
                 for node in succsset[1:]:
                     ui.write(b' ')
                     ui.write(node2str(node))
             ui.write(b'\n')
 
 
 @command(b'debugtagscache', [])
 def debugtagscache(ui, repo):
     """display the contents of .hg/cache/hgtagsfnodes1"""
     cache = tagsmod.hgtagsfnodescache(repo.unfiltered())
     flog = repo.file(b'.hgtags')
     for r in repo:
         node = repo[r].node()
         tagsnode = cache.getfnode(node, computemissing=False)
         if tagsnode:
             tagsnodedisplay = hex(tagsnode)
             if not flog.hasnode(tagsnode):
                 tagsnodedisplay += b' (unknown node)'
         elif tagsnode is None:
             tagsnodedisplay = b'missing'
         else:
             tagsnodedisplay = b'invalid'
 
         ui.write(b'%d %s %s\n' % (r, hex(node), tagsnodedisplay))
 
 
 @command(
     b'debugtemplate',
     [
         (b'r', b'rev', [], _(b'apply template on changesets'), _(b'REV')),
         (b'D', b'define', [], _(b'define template keyword'), _(b'KEY=VALUE')),
     ],
     _(b'[-r REV]... [-D KEY=VALUE]... TEMPLATE'),
     optionalrepo=True,
 )
 def debugtemplate(ui, repo, tmpl, **opts):
     """parse and apply a template
 
     If -r/--rev is given, the template is processed as a log template and
     applied to the given changesets. Otherwise, it is processed as a generic
     template.
 
     Use --verbose to print the parsed tree.
     """
     revs = None
     if opts['rev']:
         if repo is None:
             raise error.RepoError(
                 _(b'there is no Mercurial repository here (.hg not found)')
             )
         revs = logcmdutil.revrange(repo, opts['rev'])
 
     props = {}
     for d in opts['define']:
         try:
             k, v = (e.strip() for e in d.split(b'=', 1))
             if not k or k == b'ui':
                 raise ValueError
             props[k] = v
         except ValueError:
             raise error.Abort(_(b'malformed keyword definition: %s') % d)
 
     if ui.verbose:
         aliases = ui.configitems(b'templatealias')
         tree = templater.parse(tmpl)
         ui.note(templater.prettyformat(tree), b'\n')
         newtree = templater.expandaliases(tree, aliases)
         if newtree != tree:
             ui.notenoi18n(
                 b"* expanded:\n", templater.prettyformat(newtree), b'\n'
             )
 
     if revs is None:
         tres = formatter.templateresources(ui, repo)
         t = formatter.maketemplater(ui, tmpl, resources=tres)
         if ui.verbose:
             kwds, funcs = t.symbolsuseddefault()
             ui.writenoi18n(b"* keywords: %s\n" % b', '.join(sorted(kwds)))
             ui.writenoi18n(b"* functions: %s\n" % b', '.join(sorted(funcs)))
         ui.write(t.renderdefault(props))
     else:
         displayer = logcmdutil.maketemplater(ui, repo, tmpl)
         if ui.verbose:
             kwds, funcs = displayer.t.symbolsuseddefault()
             ui.writenoi18n(b"* keywords: %s\n" % b', '.join(sorted(kwds)))
             ui.writenoi18n(b"* functions: %s\n" % b', '.join(sorted(funcs)))
         for r in revs:
             displayer.show(repo[r], **pycompat.strkwargs(props))
         displayer.close()
 
 
 @command(
     b'debuguigetpass',
     [
         (b'p', b'prompt', b'', _(b'prompt text'), _(b'TEXT')),
     ],
     _(b'[-p TEXT]'),
     norepo=True,
 )
 def debuguigetpass(ui, prompt=b''):
     """show prompt to type password"""
     r = ui.getpass(prompt)
     if r is None:
         r = b"<default response>"
     ui.writenoi18n(b'response: %s\n' % r)
 
 
 @command(
     b'debuguiprompt',
     [
         (b'p', b'prompt', b'', _(b'prompt text'), _(b'TEXT')),
     ],
     _(b'[-p TEXT]'),
     norepo=True,
 )
 def debuguiprompt(ui, prompt=b''):
     """show plain prompt"""
     r = ui.prompt(prompt)
     ui.writenoi18n(b'response: %s\n' % r)
 
 
 @command(b'debugupdatecaches', [])
 def debugupdatecaches(ui, repo, *pats, **opts):
     """warm all known caches in the repository"""
     with repo.wlock(), repo.lock():
         repo.updatecaches(caches=repository.CACHES_ALL)
 
 
 @command(
     b'debugupgraderepo',
     [
         (
             b'o',
             b'optimize',
             [],
             _(b'extra optimization to perform'),
             _(b'NAME'),
         ),
         (b'', b'run', False, _(b'performs an upgrade')),
         (b'', b'backup', True, _(b'keep the old repository content around')),
         (b'', b'changelog', None, _(b'select the changelog for upgrade')),
         (b'', b'manifest', None, _(b'select the manifest for upgrade')),
         (b'', b'filelogs', None, _(b'select all filelogs for upgrade')),
     ],
 )
 def debugupgraderepo(ui, repo, run=False, optimize=None, backup=True, **opts):
     """upgrade a repository to use different features
 
     If no arguments are specified, the repository is evaluated for upgrade
     and a list of problems and potential optimizations is printed.
 
     With ``--run``, a repository upgrade is performed. Behavior of the upgrade
     can be influenced via additional arguments. More details will be provided
     by the command output when run without ``--run``.
 
     During the upgrade, the repository will be locked and no writes will be
     allowed.
 
     At the end of the upgrade, the repository may not be readable while new
     repository data is swapped in. This window will be as long as it takes to
     rename some directories inside the ``.hg`` directory. On most machines, this
     should complete almost instantaneously and the chances of a consumer being
     unable to access the repository should be low.
 
     By default, all revlogs will be upgraded. You can restrict this using flags
     such as `--manifest`:
 
       * `--manifest`: only optimize the manifest
       * `--no-manifest`: optimize all revlog but the manifest
       * `--changelog`: optimize the changelog only
       * `--no-changelog --no-manifest`: optimize filelogs only
       * `--filelogs`: optimize the filelogs only
       * `--no-changelog --no-manifest --no-filelogs`: skip all revlog optimizations
     """
     return upgrade.upgraderepo(
         ui, repo, run=run, optimize=set(optimize), backup=backup, **opts
     )
 
 
 @command(
     b'debugwalk', cmdutil.walkopts, _(b'[OPTION]... [FILE]...'), inferrepo=True
 )
 def debugwalk(ui, repo, *pats, **opts):
     """show how files match on given patterns"""
     opts = pycompat.byteskwargs(opts)
     m = scmutil.match(repo[None], pats, opts)
     if ui.verbose:
         ui.writenoi18n(b'* matcher:\n', stringutil.prettyrepr(m), b'\n')
     items = list(repo[None].walk(m))
     if not items:
         return
     f = lambda fn: fn
     if ui.configbool(b'ui', b'slash') and pycompat.ossep != b'/':
         f = lambda fn: util.normpath(fn)
     fmt = b'f  %%-%ds  %%-%ds  %%s' % (
         max([len(abs) for abs in items]),
         max([len(repo.pathto(abs)) for abs in items]),
     )
     for abs in items:
         line = fmt % (
             abs,
             f(repo.pathto(abs)),
             m.exact(abs) and b'exact' or b'',
         )
         ui.write(b"%s\n" % line.rstrip())
 
 
 @command(b'debugwhyunstable', [], _(b'REV'))
 def debugwhyunstable(ui, repo, rev):
     """explain instabilities of a changeset"""
     for entry in obsutil.whyunstable(repo, scmutil.revsingle(repo, rev)):
         dnodes = b''
         if entry.get(b'divergentnodes'):
             dnodes = (
                 b' '.join(
                     b'%s (%s)' % (ctx.hex(), ctx.phasestr())
                     for ctx in entry[b'divergentnodes']
                 )
                 + b' '
             )
         ui.write(
             b'%s: %s%s %s\n'
             % (entry[b'instability'], dnodes, entry[b'reason'], entry[b'node'])
         )
 
 
 @command(
     b'debugwireargs',
     [
         (b'', b'three', b'', b'three'),
         (b'', b'four', b'', b'four'),
         (b'', b'five', b'', b'five'),
     ]
     + cmdutil.remoteopts,
     _(b'REPO [OPTIONS]... [ONE [TWO]]'),
     norepo=True,
 )
 def debugwireargs(ui, repopath, *vals, **opts):
     opts = pycompat.byteskwargs(opts)
     repo = hg.peer(ui, opts, repopath)
     try:
         for opt in cmdutil.remoteopts:
             del opts[opt[1]]
         args = {}
         for k, v in opts.items():
             if v:
                 args[k] = v
         args = pycompat.strkwargs(args)
         # run twice to check that we don't mess up the stream for the next command
         res1 = repo.debugwireargs(*vals, **args)
         res2 = repo.debugwireargs(*vals, **args)
         ui.write(b"%s\n" % res1)
         if res1 != res2:
             ui.warn(b"%s\n" % res2)
     finally:
         repo.close()
 
 
 def _parsewirelangblocks(fh):
     activeaction = None
     blocklines = []
     lastindent = 0
 
     for line in fh:
         line = line.rstrip()
         if not line:
             continue
 
         if line.startswith(b'#'):
             continue
 
         if not line.startswith(b' '):
             # New block. Flush previous one.
             if activeaction:
                 yield activeaction, blocklines
 
             activeaction = line
             blocklines = []
             lastindent = 0
             continue
 
         # Else we start with an indent.
 
         if not activeaction:
             raise error.Abort(_(b'indented line outside of block'))
 
         indent = len(line) - len(line.lstrip())
 
         # If this line is indented more than the last line, concatenate it.
         if indent > lastindent and blocklines:
             blocklines[-1] += line.lstrip()
         else:
             blocklines.append(line)
             lastindent = indent
 
     # Flush last block.
     if activeaction:
         yield activeaction, blocklines
 
 
 @command(
     b'debugwireproto',
     [
         (b'', b'localssh', False, _(b'start an SSH server for this repo')),
         (b'', b'peer', b'', _(b'construct a specific version of the peer')),
         (
             b'',
             b'noreadstderr',
             False,
             _(b'do not read from stderr of the remote'),
         ),
         (
             b'',
             b'nologhandshake',
             False,
             _(b'do not log I/O related to the peer handshake'),
         ),
     ]
     + cmdutil.remoteopts,
     _(b'[PATH]'),
     optionalrepo=True,
 )
 def debugwireproto(ui, repo, path=None, **opts):
     """send wire protocol commands to a server
 
     This command can be used to issue wire protocol commands to remote
     peers and to debug the raw data being exchanged.
 
     ``--localssh`` will start an SSH server against the current repository
     and connect to that. By default, the connection will perform a handshake
     and establish an appropriate peer instance.
 
     ``--peer`` can be used to bypass the handshake protocol and construct a
     peer instance using the specified class type. Valid values are ``raw``,
     ``ssh1``. ``raw`` instances only allow sending raw data payloads and
     don't support higher-level command actions.
 
     ``--noreadstderr`` can be used to disable automatic reading from stderr
     of the peer (for SSH connections only). Disabling automatic reading of
     stderr is useful for making output more deterministic.
 
     Commands are issued via a mini language which is specified via stdin.
     The language consists of individual actions to perform. An action is
     defined by a block. A block is defined as a line with no leading
     space followed by 0 or more lines with leading space. Blocks are
     effectively a high-level command with additional metadata.
 
     Lines beginning with ``#`` are ignored.
 
     The following sections denote available actions.
 
     raw
     ---
 
     Send raw data to the server.
 
     The block payload contains the raw data to send as one atomic send
     operation. The data may not actually be delivered in a single system
     call: it depends on the abilities of the transport being used.
 
     Each line in the block is de-indented and concatenated. Then, that
     value is evaluated as a Python b'' literal. This allows the use of
     backslash escaping, etc.
 
     raw+
     ----
 
     Behaves like ``raw`` except flushes output afterwards.
 
     command <X>
     -----------
 
     Send a request to run a named command, whose name follows the ``command``
     string.
 
     Arguments to the command are defined as lines in this block. The format of
     each line is ``<key> <value>``. e.g.::
 
        command listkeys
            namespace bookmarks
 
     If the value begins with ``eval:``, it will be interpreted as a Python
     literal expression. Otherwise values are interpreted as Python b'' literals.
     This allows sending complex types and encoding special byte sequences via
     backslash escaping.
 
     The following arguments have special meaning:
 
     ``PUSHFILE``
         When defined, the *push* mechanism of the peer will be used instead
         of the static request-response mechanism and the content of the
         file specified in the value of this argument will be sent as the
         command payload.
 
         This can be used to submit a local bundle file to the remote.
 
     batchbegin
     ----------
 
     Instruct the peer to begin a batched send.
 
     All ``command`` blocks are queued for execution until the next
     ``batchsubmit`` block.
 
     batchsubmit
     -----------
 
     Submit previously queued ``command`` blocks as a batch request.
 
     This action MUST be paired with a ``batchbegin`` action.
 
     httprequest <method> <path>
     ---------------------------
 
     (HTTP peer only)
 
     Send an HTTP request to the peer.
 
     The HTTP request line follows the ``httprequest`` action. e.g. ``GET /foo``.
 
     Arguments of the form ``<key>: <value>`` are interpreted as HTTP request
     headers to add to the request. e.g. ``Accept: foo``.
 
     The following arguments are special:
 
     ``BODYFILE``
         The content of the file defined as the value to this argument will be
         transferred verbatim as the HTTP request body.
 
     ``frame <type> <flags> <payload>``
         Send a unified protocol frame as part of the request body.
 
         All frames will be collected and sent as the body to the HTTP
         request.
 
     close
     -----
 
     Close the connection to the server.
 
     flush
     -----
 
     Flush data written to the server.
 
     readavailable
     -------------
 
     Close the write end of the connection and read all available data from
     the server.
 
     If the connection to the server encompasses multiple pipes, we poll both
     pipes and read available data.
 
     readline
     --------
 
     Read a line of output from the server. If there are multiple output
     pipes, reads only the main pipe.
 
     ereadline
     ---------
 
     Like ``readline``, but read from the stderr pipe, if available.
 
     read <X>
     --------
 
     ``read()`` N bytes from the server's main output pipe.
 
     eread <X>
     ---------
 
     ``read()`` N bytes from the server's stderr pipe, if available.
 
     Specifying Unified Frame-Based Protocol Frames
     ----------------------------------------------
 
     It is possible to emit a *Unified Frame-Based Protocol* by using special
     syntax.
 
     A frame is composed as a type, flags, and payload. These can be parsed
     from a string of the form:
 
        <request-id> <stream-id> <stream-flags> <type> <flags> <payload>
 
     ``request-id`` and ``stream-id`` are integers defining the request and
     stream identifiers.
 
     ``type`` can be an integer value for the frame type or the string name
     of the type. The strings are defined in ``wireprotoframing.py``. e.g.
     ``command-name``.
 
     ``stream-flags`` and ``flags`` are a ``|`` delimited list of flag
     components. Each component (and there can be just one) can be an integer
     or a flag name for stream flags or frame flags, respectively. Values are
     resolved to integers and then bitwise OR'd together.
 
     ``payload`` represents the raw frame payload. If it begins with
     ``cbor:``, the following string is evaluated as Python code and the
     resulting object is fed into a CBOR encoder. Otherwise it is interpreted
     as a Python byte string literal.
     """
     opts = pycompat.byteskwargs(opts)
 
     if opts[b'localssh'] and not repo:
         raise error.Abort(_(b'--localssh requires a repository'))
 
     if opts[b'peer'] and opts[b'peer'] not in (
         b'raw',
         b'ssh1',
     ):
         raise error.Abort(
             _(b'invalid value for --peer'),
             hint=_(b'valid values are "raw" and "ssh1"'),
         )
 
     if path and opts[b'localssh']:
         raise error.Abort(_(b'cannot specify --localssh with an explicit path'))
 
     if ui.interactive():
         ui.write(_(b'(waiting for commands on stdin)\n'))
 
     blocks = list(_parsewirelangblocks(ui.fin))
 
     proc = None
     stdin = None
     stdout = None
     stderr = None
     opener = None
 
     if opts[b'localssh']:
         # We start the SSH server in its own process so there is process
         # separation. This prevents a whole class of potential bugs around
         # shared state from interfering with server operation.
         args = procutil.hgcmd() + [
             b'-R',
             repo.root,
             b'debugserve',
             b'--sshstdio',
         ]
         proc = subprocess.Popen(
             pycompat.rapply(procutil.tonativestr, args),
             stdin=subprocess.PIPE,
             stdout=subprocess.PIPE,
             stderr=subprocess.PIPE,
             bufsize=0,
         )
 
         stdin = proc.stdin
         stdout = proc.stdout
         stderr = proc.stderr
 
         # We turn the pipes into observers so we can log I/O.
         if ui.verbose or opts[b'peer'] == b'raw':
             stdin = util.makeloggingfileobject(
                 ui, proc.stdin, b'i', logdata=True
             )
             stdout = util.makeloggingfileobject(
                 ui, proc.stdout, b'o', logdata=True
             )
             stderr = util.makeloggingfileobject(
                 ui, proc.stderr, b'e', logdata=True
             )
 
         # --localssh also implies the peer connection settings.
 
         url = b'ssh://localserver'
         autoreadstderr = not opts[b'noreadstderr']
 
         if opts[b'peer'] == b'ssh1':
             ui.write(_(b'creating ssh peer for wire protocol version 1\n'))
             peer = sshpeer.sshv1peer(
                 ui,
                 url,
                 proc,
                 stdin,
                 stdout,
                 stderr,
                 None,
                 autoreadstderr=autoreadstderr,
             )
         elif opts[b'peer'] == b'raw':
             ui.write(_(b'using raw connection to peer\n'))
             peer = None
         else:
             ui.write(_(b'creating ssh peer from handshake results\n'))
             peer = sshpeer._make_peer(
                 ui,
                 url,
                 proc,
                 stdin,
                 stdout,
                 stderr,
                 autoreadstderr=autoreadstderr,
             )
 
     elif path:
         # We bypass hg.peer() so we can proxy the sockets.
         # TODO consider not doing this because we skip
         # ``hg.wirepeersetupfuncs`` and potentially other useful functionality.
         u = urlutil.url(path)
         if u.scheme != b'http':
             raise error.Abort(_(b'only http:// paths are currently supported'))
 
         url, authinfo = u.authinfo()
         openerargs = {
             'useragent': b'Mercurial debugwireproto',
         }
 
         # Turn pipes/sockets into observers so we can log I/O.
         if ui.verbose:
             openerargs.update(
                 {
                     'loggingfh': ui,
                     'loggingname': b's',
                     'loggingopts': {
                         'logdata': True,
                         'logdataapis': False,
                     },
                 }
             )
 
         if ui.debugflag:
             openerargs['loggingopts']['logdataapis'] = True
 
         # Don't send default headers when in raw mode. This allows us to
         # bypass most of the behavior of our URL handling code so we can
         # have near complete control over what's sent on the wire.
         if opts[b'peer'] == b'raw':
             openerargs['sendaccept'] = False
 
         opener = urlmod.opener(ui, authinfo, **openerargs)
 
         if opts[b'peer'] == b'raw':
             ui.write(_(b'using raw connection to peer\n'))
             peer = None
         elif opts[b'peer']:
             raise error.Abort(
                 _(b'--peer %s not supported with HTTP peers') % opts[b'peer']
             )
         else:
             peer_path = urlutil.try_path(ui, path)
             peer = httppeer._make_peer(ui, peer_path, opener=opener)
 
         # We /could/ populate stdin/stdout with sock.makefile()...
     else:
         raise error.Abort(_(b'unsupported connection configuration'))
 
     batchedcommands = None
 
     # Now perform actions based on the parsed wire language instructions.
     for action, lines in blocks:
         if action in (b'raw', b'raw+'):
             if not stdin:
                 raise error.Abort(_(b'cannot call raw/raw+ on this peer'))
 
             # Concatenate the data together.
             data = b''.join(l.lstrip() for l in lines)
             data = stringutil.unescapestr(data)
             stdin.write(data)
 
             if action == b'raw+':
                 stdin.flush()
         elif action == b'flush':
             if not stdin:
                 raise error.Abort(_(b'cannot call flush on this peer'))
             stdin.flush()
         elif action.startswith(b'command'):
             if not peer:
                 raise error.Abort(
                     _(
                         b'cannot send commands unless peer instance '
                         b'is available'
                     )
                 )
 
             command = action.split(b' ', 1)[1]
 
             args = {}
             for line in lines:
                 # We need to allow empty values.
                 fields = line.lstrip().split(b' ', 1)
                 if len(fields) == 1:
                     key = fields[0]
                     value = b''
                 else:
                     key, value = fields
 
                 if value.startswith(b'eval:'):
                     value = stringutil.evalpythonliteral(value[5:])
                 else:
                     value = stringutil.unescapestr(value)
 
                 args[key] = value
 
             if batchedcommands is not None:
                 batchedcommands.append((command, args))
                 continue
 
             ui.status(_(b'sending %s command\n') % command)
 
             if b'PUSHFILE' in args:
                 with open(args[b'PUSHFILE'], 'rb') as fh:
                     del args[b'PUSHFILE']
                     res, output = peer._callpush(
                         command, fh, **pycompat.strkwargs(args)
                     )
                     ui.status(_(b'result: %s\n') % stringutil.escapestr(res))
                     ui.status(
                         _(b'remote output: %s\n') % stringutil.escapestr(output)
                     )
             else:
                 with peer.commandexecutor() as e:
                     res = e.callcommand(command, args).result()
 
                 ui.status(
                     _(b'response: %s\n')
                     % stringutil.pprint(res, bprefix=True, indent=2)
                 )
 
         elif action == b'batchbegin':
             if batchedcommands is not None:
                 raise error.Abort(_(b'nested batchbegin not allowed'))
 
             batchedcommands = []
         elif action == b'batchsubmit':
             # There is a batching API we could go through. But it would be
             # difficult to normalize requests into function calls. It is easier
             # to bypass this layer and normalize to commands + args.
             ui.status(
                 _(b'sending batch with %d sub-commands\n')
                 % len(batchedcommands)
             )
             assert peer is not None
             for i, chunk in enumerate(peer._submitbatch(batchedcommands)):
                 ui.status(
                     _(b'response #%d: %s\n') % (i, stringutil.escapestr(chunk))
                 )
 
             batchedcommands = None
 
         elif action.startswith(b'httprequest '):
             if not opener:
                 raise error.Abort(
                     _(b'cannot use httprequest without an HTTP peer')
                 )
 
             request = action.split(b' ', 2)
             if len(request) != 3:
                 raise error.Abort(
                     _(
                         b'invalid httprequest: expected format is '
                         b'"httprequest <method> <path>'
                     )
                 )
 
             method, httppath = request[1:]
             headers = {}
             body = None
             frames = []
             for line in lines:
                 line = line.lstrip()
                 m = re.match(b'^([a-zA-Z0-9_-]+): (.*)$', line)
                 if m:
                     # Headers need to use native strings.
                     key = pycompat.strurl(m.group(1))
                     value = pycompat.strurl(m.group(2))
                     headers[key] = value
                     continue
 
                 if line.startswith(b'BODYFILE '):
                     with open(line.split(b' ', 1), b'rb') as fh:
                         body = fh.read()
                 elif line.startswith(b'frame '):
                     frame = wireprotoframing.makeframefromhumanstring(
                         line[len(b'frame ') :]
                     )
 
                     frames.append(frame)
                 else:
                     raise error.Abort(
                         _(b'unknown argument to httprequest: %s') % line
                     )
 
             url = path + httppath
 
             if frames:
                 body = b''.join(bytes(f) for f in frames)
 
             req = urlmod.urlreq.request(pycompat.strurl(url), body, headers)
 
             # urllib.Request insists on using has_data() as a proxy for
             # determining the request method. Override that to use our
             # explicitly requested method.
             req.get_method = lambda: pycompat.sysstr(method)
 
             try:
                 res = opener.open(req)
                 body = res.read()
             except util.urlerr.urlerror as e:
                 # read() method must be called, but only exists in Python 2
                 getattr(e, 'read', lambda: None)()
                 continue
 
             ct = res.headers.get('Content-Type')
             if ct == 'application/mercurial-cbor':
                 ui.write(
                     _(b'cbor> %s\n')
                     % stringutil.pprint(
                         cborutil.decodeall(body), bprefix=True, indent=2
                     )
                 )
 
         elif action == b'close':
             assert peer is not None
             peer.close()
         elif action == b'readavailable':
             if not stdout or not stderr:
                 raise error.Abort(
                     _(b'readavailable not available on this peer')
                 )
 
             stdin.close()
             stdout.read()
             stderr.read()
 
         elif action == b'readline':
             if not stdout:
                 raise error.Abort(_(b'readline not available on this peer'))
             stdout.readline()
         elif action == b'ereadline':
             if not stderr:
                 raise error.Abort(_(b'ereadline not available on this peer'))
             stderr.readline()
         elif action.startswith(b'read '):
             count = int(action.split(b' ', 1)[1])
             if not stdout:
                 raise error.Abort(_(b'read not available on this peer'))
             stdout.read(count)
         elif action.startswith(b'eread '):
             count = int(action.split(b' ', 1)[1])
             if not stderr:
                 raise error.Abort(_(b'eread not available on this peer'))
             stderr.read(count)
         else:
             raise error.Abort(_(b'unknown action: %s') % action)
 
     if batchedcommands is not None:
         raise error.Abort(_(b'unclosed "batchbegin" request'))
 
     if peer:
         peer.close()
 
     if proc:
         proc.kill()

setup.py

@@ -1,1804 +1,1805 b''
 #
 # This is the mercurial setup script.
 #
 # 'python setup.py install', or
 # 'python setup.py --help' for more options
 import os
 
 # Mercurial can't work on 3.6.0 or 3.6.1 due to a bug in % formatting
 # in bytestrings.
 supportedpy = ','.join(
     [
         '>=3.6.2',
     ]
 )
 
 import sys, platform
 import sysconfig
 
 
 def sysstr(s):
     return s.decode('latin-1')
 
 
 def eprint(*args, **kwargs):
     kwargs['file'] = sys.stderr
     print(*args, **kwargs)
 
 
 import ssl
 
 # ssl.HAS_TLSv1* are preferred to check support but they were added in Python
 # 3.7. Prior to CPython commit 6e8cda91d92da72800d891b2fc2073ecbc134d98
 # (backported to the 3.7 branch), ssl.PROTOCOL_TLSv1_1 / ssl.PROTOCOL_TLSv1_2
 # were defined only if compiled against a OpenSSL version with TLS 1.1 / 1.2
 # support. At the mentioned commit, they were unconditionally defined.
 _notset = object()
 has_tlsv1_1 = getattr(ssl, 'HAS_TLSv1_1', _notset)
 if has_tlsv1_1 is _notset:
     has_tlsv1_1 = getattr(ssl, 'PROTOCOL_TLSv1_1', _notset) is not _notset
 has_tlsv1_2 = getattr(ssl, 'HAS_TLSv1_2', _notset)
 if has_tlsv1_2 is _notset:
     has_tlsv1_2 = getattr(ssl, 'PROTOCOL_TLSv1_2', _notset) is not _notset
 if not (has_tlsv1_1 or has_tlsv1_2):
     error = """
 The `ssl` module does not advertise support for TLS 1.1 or TLS 1.2.
 Please make sure that your Python installation was compiled against an OpenSSL
 version enabling these features (likely this requires the OpenSSL version to
 be at least 1.0.1).
 """
     print(error, file=sys.stderr)
     sys.exit(1)
 
 DYLIB_SUFFIX = sysconfig.get_config_vars()['EXT_SUFFIX']
 
 # Solaris Python packaging brain damage
 try:
     import hashlib
 
     sha = hashlib.sha1()
 except ImportError:
     try:
         import sha
 
         sha.sha  # silence unused import warning
     except ImportError:
         raise SystemExit(
             "Couldn't import standard hashlib (incomplete Python install)."
         )
 
 try:
     import zlib
 
     zlib.compressobj  # silence unused import warning
 except ImportError:
     raise SystemExit(
         "Couldn't import standard zlib (incomplete Python install)."
     )
 
 # The base IronPython distribution (as of 2.7.1) doesn't support bz2
 isironpython = False
 try:
     isironpython = (
         platform.python_implementation().lower().find("ironpython") != -1
     )
 except AttributeError:
     pass
 
 if isironpython:
     sys.stderr.write("warning: IronPython detected (no bz2 support)\n")
 else:
     try:
         import bz2
 
         bz2.BZ2Compressor  # silence unused import warning
     except ImportError:
         raise SystemExit(
             "Couldn't import standard bz2 (incomplete Python install)."
         )
 
 ispypy = "PyPy" in sys.version
 
 import ctypes
 import stat, subprocess, time
 import re
 import shutil
 import tempfile
 
 # We have issues with setuptools on some platforms and builders. Until
 # those are resolved, setuptools is opt-in except for platforms where
 # we don't have issues.
 issetuptools = os.name == 'nt' or 'FORCE_SETUPTOOLS' in os.environ
 if issetuptools:
     from setuptools import setup
 else:
     from distutils.core import setup
 from distutils.ccompiler import new_compiler
 from distutils.core import Command, Extension
 from distutils.dist import Distribution
 from distutils.command.build import build
 from distutils.command.build_ext import build_ext
 from distutils.command.build_py import build_py
 from distutils.command.build_scripts import build_scripts
 from distutils.command.install import install
 from distutils.command.install_lib import install_lib
 from distutils.command.install_scripts import install_scripts
 from distutils import log
 from distutils.spawn import spawn, find_executable
 from distutils import file_util
 from distutils.errors import (
     CCompilerError,
     DistutilsError,
     DistutilsExecError,
 )
 from distutils.sysconfig import get_python_inc
 
 
 def write_if_changed(path, content):
     """Write content to a file iff the content hasn't changed."""
     if os.path.exists(path):
         with open(path, 'rb') as fh:
             current = fh.read()
     else:
         current = b''
 
     if current != content:
         with open(path, 'wb') as fh:
             fh.write(content)
 
 
 scripts = ['hg']
 if os.name == 'nt':
     # We remove hg.bat if we are able to build hg.exe.
     scripts.append('contrib/win32/hg.bat')
 
 
 def cancompile(cc, code):
     tmpdir = tempfile.mkdtemp(prefix='hg-install-')
     devnull = oldstderr = None
     try:
         fname = os.path.join(tmpdir, 'testcomp.c')
         f = open(fname, 'w')
         f.write(code)
         f.close()
         # Redirect stderr to /dev/null to hide any error messages
         # from the compiler.
         # This will have to be changed if we ever have to check
         # for a function on Windows.
         devnull = open('/dev/null', 'w')
         oldstderr = os.dup(sys.stderr.fileno())
         os.dup2(devnull.fileno(), sys.stderr.fileno())
         objects = cc.compile([fname], output_dir=tmpdir)
         cc.link_executable(objects, os.path.join(tmpdir, "a.out"))
         return True
     except Exception:
         return False
     finally:
         if oldstderr is not None:
             os.dup2(oldstderr, sys.stderr.fileno())
         if devnull is not None:
             devnull.close()
         shutil.rmtree(tmpdir)
 
 
 # simplified version of distutils.ccompiler.CCompiler.has_function
 # that actually removes its temporary files.
 def hasfunction(cc, funcname):
     code = 'int main(void) { %s(); }\n' % funcname
     return cancompile(cc, code)
 
 
 def hasheader(cc, headername):
     code = '#include <%s>\nint main(void) { return 0; }\n' % headername
     return cancompile(cc, code)
 
 
 # py2exe needs to be installed to work
 try:
     import py2exe
 
     py2exe.patch_distutils()
     py2exeloaded = True
     # import py2exe's patched Distribution class
     from distutils.core import Distribution
 except ImportError:
     py2exeloaded = False
 
 
 def runcmd(cmd, env, cwd=None):
     p = subprocess.Popen(
         cmd, stdout=subprocess.PIPE, stderr=subprocess.PIPE, env=env, cwd=cwd
     )
     out, err = p.communicate()
     return p.returncode, out, err
 
 
 class hgcommand:
     def __init__(self, cmd, env):
         self.cmd = cmd
         self.env = env
 
     def run(self, args):
         cmd = self.cmd + args
         returncode, out, err = runcmd(cmd, self.env)
         err = filterhgerr(err)
         if err:
             print("stderr from '%s':" % (' '.join(cmd)), file=sys.stderr)
             print(err, file=sys.stderr)
         if returncode != 0:
             return b''
         return out
 
 
 def filterhgerr(err):
     # If root is executing setup.py, but the repository is owned by
     # another user (as in "sudo python setup.py install") we will get
     # trust warnings since the .hg/hgrc file is untrusted. That is
     # fine, we don't want to load it anyway.  Python may warn about
     # a missing __init__.py in mercurial/locale, we also ignore that.
     err = [
         e
         for e in err.splitlines()
         if (
             not e.startswith(b'not trusting file')
             and not e.startswith(b'warning: Not importing')
             and not e.startswith(b'obsolete feature not enabled')
             and not e.startswith(b'*** failed to import extension')
             and not e.startswith(b'devel-warn:')
             and not (
                 e.startswith(b'(third party extension')
                 and e.endswith(b'or newer of Mercurial; disabling)')
             )
         )
     ]
     return b'\n'.join(b'  ' + e for e in err)
 
 
 def findhg():
     """Try to figure out how we should invoke hg for examining the local
     repository contents.
 
     Returns an hgcommand object."""
     # By default, prefer the "hg" command in the user's path.  This was
     # presumably the hg command that the user used to create this repository.
     #
     # This repository may require extensions or other settings that would not
     # be enabled by running the hg script directly from this local repository.
     hgenv = os.environ.copy()
     # Use HGPLAIN to disable hgrc settings that would change output formatting,
     # and disable localization for the same reasons.
     hgenv['HGPLAIN'] = '1'
     hgenv['LANGUAGE'] = 'C'
     hgcmd = ['hg']
     # Run a simple "hg log" command just to see if using hg from the user's
     # path works and can successfully interact with this repository.  Windows
     # gives precedence to hg.exe in the current directory, so fall back to the
     # python invocation of local hg, where pythonXY.dll can always be found.
     check_cmd = ['log', '-r.', '-Ttest']
     if os.name != 'nt' or not os.path.exists("hg.exe"):
         try:
             retcode, out, err = runcmd(hgcmd + check_cmd, hgenv)
         except EnvironmentError:
             retcode = -1
         if retcode == 0 and not filterhgerr(err):
             return hgcommand(hgcmd, hgenv)
 
     # Fall back to trying the local hg installation.
     hgenv = localhgenv()
     hgcmd = [sys.executable, 'hg']
     try:
         retcode, out, err = runcmd(hgcmd + check_cmd, hgenv)
     except EnvironmentError:
         retcode = -1
     if retcode == 0 and not filterhgerr(err):
         return hgcommand(hgcmd, hgenv)
 
     eprint("/!\\")
     eprint(r"/!\ Unable to find a working hg binary")
     eprint(r"/!\ Version cannot be extract from the repository")
     eprint(r"/!\ Re-run the setup once a first version is built")
     return None
 
 
 def localhgenv():
     """Get an environment dictionary to use for invoking or importing
     mercurial from the local repository."""
     # Execute hg out of this directory with a custom environment which takes
     # care to not use any hgrc files and do no localization.
     env = {
         'HGMODULEPOLICY': 'py',
         'HGRCPATH': '',
         'LANGUAGE': 'C',
         'PATH': '',
     }  # make pypi modules that use os.environ['PATH'] happy
     if 'LD_LIBRARY_PATH' in os.environ:
         env['LD_LIBRARY_PATH'] = os.environ['LD_LIBRARY_PATH']
     if 'SystemRoot' in os.environ:
         # SystemRoot is required by Windows to load various DLLs.  See:
         # https://bugs.python.org/issue13524#msg148850
         env['SystemRoot'] = os.environ['SystemRoot']
     return env
 
 
 version = ''
 
 
 def _try_get_version():
     hg = findhg()
     if hg is None:
         return ''
     hgid = None
     numerictags = []
     cmd = ['log', '-r', '.', '--template', '{tags}\n']
     pieces = sysstr(hg.run(cmd)).split()
     numerictags = [t for t in pieces if t[0:1].isdigit()]
     hgid = sysstr(hg.run(['id', '-i'])).strip()
     if hgid.count('+') == 2:
         hgid = hgid.replace("+", ".", 1)
     if not hgid:
         eprint("/!\\")
         eprint(r"/!\ Unable to determine hg version from local repository")
         eprint(r"/!\ Failed to retrieve current revision tags")
         return ''
     if numerictags:  # tag(s) found
         version = numerictags[-1]
         if hgid.endswith('+'):  # propagate the dirty status to the tag
             version += '+'
     else:  # no tag found on the checked out revision
         ltagcmd = ['log', '--rev', 'wdir()', '--template', '{latesttag}']
         ltag = sysstr(hg.run(ltagcmd))
         if not ltag:
             eprint("/!\\")
             eprint(r"/!\ Unable to determine hg version from local repository")
             eprint(
                 r"/!\ Failed to retrieve current revision distance to lated tag"
             )
             return ''
         changessincecmd = [
             'log',
             '-T',
             'x\n',
             '-r',
             "only(parents(),'%s')" % ltag,
         ]
         changessince = len(hg.run(changessincecmd).splitlines())
         version = '%s+hg%s.%s' % (ltag, changessince, hgid)
     if version.endswith('+'):
         version = version[:-1] + 'local' + time.strftime('%Y%m%d')
     return version
 
 
 if os.path.isdir('.hg'):
     version = _try_get_version()
 elif os.path.exists('.hg_archival.txt'):
     kw = dict(
         [[t.strip() for t in l.split(':', 1)] for l in open('.hg_archival.txt')]
     )
     if 'tag' in kw:
         version = kw['tag']
     elif 'latesttag' in kw:
         if 'changessincelatesttag' in kw:
             version = (
                 '%(latesttag)s+hg%(changessincelatesttag)s.%(node).12s' % kw
             )
         else:
             version = '%(latesttag)s+hg%(latesttagdistance)s.%(node).12s' % kw
     else:
         version = '0+hg' + kw.get('node', '')[:12]
 elif os.path.exists('mercurial/__version__.py'):
     with open('mercurial/__version__.py') as f:
         data = f.read()
     version = re.search('version = b"(.*)"', data).group(1)
 if not version:
     if os.environ.get("MERCURIAL_SETUP_MAKE_LOCAL") == "1":
         version = "0.0+0"
         eprint("/!\\")
         eprint(r"/!\ Using '0.0+0' as the default version")
         eprint(r"/!\ Re-run make local once that first version is built")
         eprint("/!\\")
     else:
         eprint("/!\\")
         eprint(r"/!\ Could not determine the Mercurial version")
         eprint(r"/!\ You need to build a local version first")
         eprint(r"/!\ Run `make local` and try again")
         eprint("/!\\")
         msg = "Run `make local` first to get a working local version"
         raise SystemExit(msg)
 
 versionb = version
 if not isinstance(versionb, bytes):
     versionb = versionb.encode('ascii')
 
 write_if_changed(
     'mercurial/__version__.py',
     b''.join(
         [
             b'# this file is autogenerated by setup.py\n'
             b'version = b"%s"\n' % versionb,
         ]
     ),
 )
 
 
 class hgbuild(build):
     # Insert hgbuildmo first so that files in mercurial/locale/ are found
     # when build_py is run next.
     sub_commands = [('build_mo', None)] + build.sub_commands
 
 
 class hgbuildmo(build):
 
     description = "build translations (.mo files)"
 
     def run(self):
         if not find_executable('msgfmt'):
             self.warn(
                 "could not find msgfmt executable, no translations "
                 "will be built"
             )
             return
 
         podir = 'i18n'
         if not os.path.isdir(podir):
             self.warn("could not find %s/ directory" % podir)
             return
 
         join = os.path.join
         for po in os.listdir(podir):
             if not po.endswith('.po'):
                 continue
             pofile = join(podir, po)
             modir = join('locale', po[:-3], 'LC_MESSAGES')
             mofile = join(modir, 'hg.mo')
             mobuildfile = join('mercurial', mofile)
             cmd = ['msgfmt', '-v', '-o', mobuildfile, pofile]
             if sys.platform != 'sunos5':
                 # msgfmt on Solaris does not know about -c
                 cmd.append('-c')
             self.mkpath(join('mercurial', modir))
             self.make_file([pofile], mobuildfile, spawn, (cmd,))
 
 
 class hgdist(Distribution):
     pure = False
     rust = False
     no_rust = False
     cffi = ispypy
 
     global_options = Distribution.global_options + [
         ('pure', None, "use pure (slow) Python code instead of C extensions"),
         ('rust', None, "use Rust extensions additionally to C extensions"),
         (
             'no-rust',
             None,
             "do not use Rust extensions additionally to C extensions",
         ),
     ]
 
     negative_opt = Distribution.negative_opt.copy()
     boolean_options = ['pure', 'rust', 'no-rust']
     negative_opt['no-rust'] = 'rust'
 
     def _set_command_options(self, command_obj, option_dict=None):
         # Not all distutils versions in the wild have boolean_options.
         # This should be cleaned up when we're Python 3 only.
         command_obj.boolean_options = (
             getattr(command_obj, 'boolean_options', []) + self.boolean_options
         )
         return Distribution._set_command_options(
             self, command_obj, option_dict=option_dict
         )
 
     def parse_command_line(self):
         ret = Distribution.parse_command_line(self)
         if not (self.rust or self.no_rust):
             hgrustext = os.environ.get('HGWITHRUSTEXT')
             # TODO record it for proper rebuild upon changes
             # (see mercurial/__modulepolicy__.py)
             if hgrustext != 'cpython' and hgrustext is not None:
                 if hgrustext:
                     msg = 'unknown HGWITHRUSTEXT value: %s' % hgrustext
                     print(msg, file=sys.stderr)
                 hgrustext = None
             self.rust = hgrustext is not None
             self.no_rust = not self.rust
         return ret
 
     def has_ext_modules(self):
         # self.ext_modules is emptied in hgbuildpy.finalize_options which is
         # too late for some cases
         return not self.pure and Distribution.has_ext_modules(self)
 
 
 # This is ugly as a one-liner. So use a variable.
 buildextnegops = dict(getattr(build_ext, 'negative_options', {}))
 buildextnegops['no-zstd'] = 'zstd'
 buildextnegops['no-rust'] = 'rust'
 
 
 class hgbuildext(build_ext):
     user_options = build_ext.user_options + [
         ('zstd', None, 'compile zstd bindings [default]'),
         ('no-zstd', None, 'do not compile zstd bindings'),
         (
             'rust',
             None,
             'compile Rust extensions if they are in use '
             '(requires Cargo) [default]',
         ),
         ('no-rust', None, 'do not compile Rust extensions'),
     ]
 
     boolean_options = build_ext.boolean_options + ['zstd', 'rust']
     negative_opt = buildextnegops
 
     def initialize_options(self):
         self.zstd = True
         self.rust = True
 
         return build_ext.initialize_options(self)
 
     def finalize_options(self):
         # Unless overridden by the end user, build extensions in parallel.
         # Only influences behavior on Python 3.5+.
         if getattr(self, 'parallel', None) is None:
             self.parallel = True
 
         return build_ext.finalize_options(self)
 
     def build_extensions(self):
         ruststandalones = [
             e for e in self.extensions if isinstance(e, RustStandaloneExtension)
         ]
         self.extensions = [
             e for e in self.extensions if e not in ruststandalones
         ]
         # Filter out zstd if disabled via argument.
         if not self.zstd:
             self.extensions = [
                 e for e in self.extensions if e.name != 'mercurial.zstd'
             ]
 
         # Build Rust standalone extensions if it'll be used
         # and its build is not explicitly disabled (for external build
         # as Linux distributions would do)
         if self.distribution.rust and self.rust:
             if not sys.platform.startswith('linux'):
                 self.warn(
                     "rust extensions have only been tested on Linux "
                     "and may not behave correctly on other platforms"
                 )
 
             for rustext in ruststandalones:
                 rustext.build('' if self.inplace else self.build_lib)
 
         return build_ext.build_extensions(self)
 
     def build_extension(self, ext):
         if (
             self.distribution.rust
             and self.rust
             and isinstance(ext, RustExtension)
         ):
             ext.rustbuild()
         try:
             build_ext.build_extension(self, ext)
         except CCompilerError:
             if not getattr(ext, 'optional', False):
                 raise
             log.warn(
                 "Failed to build optional extension '%s' (skipping)", ext.name
             )
 
 
 class hgbuildscripts(build_scripts):
     def run(self):
         if os.name != 'nt' or self.distribution.pure:
             return build_scripts.run(self)
 
         exebuilt = False
         try:
             self.run_command('build_hgexe')
             exebuilt = True
         except (DistutilsError, CCompilerError):
             log.warn('failed to build optional hg.exe')
 
         if exebuilt:
             # Copying hg.exe to the scripts build directory ensures it is
             # installed by the install_scripts command.
             hgexecommand = self.get_finalized_command('build_hgexe')
             dest = os.path.join(self.build_dir, 'hg.exe')
             self.mkpath(self.build_dir)
             self.copy_file(hgexecommand.hgexepath, dest)
 
             # Remove hg.bat because it is redundant with hg.exe.
             self.scripts.remove('contrib/win32/hg.bat')
 
         return build_scripts.run(self)
 
 
 class hgbuildpy(build_py):
     def finalize_options(self):
         build_py.finalize_options(self)
 
         if self.distribution.pure:
             self.distribution.ext_modules = []
         elif self.distribution.cffi:
             from mercurial.cffi import (
                 bdiffbuild,
                 mpatchbuild,
             )
 
             exts = [
                 mpatchbuild.ffi.distutils_extension(),
                 bdiffbuild.ffi.distutils_extension(),
             ]
             # cffi modules go here
             if sys.platform == 'darwin':
                 from mercurial.cffi import osutilbuild
 
                 exts.append(osutilbuild.ffi.distutils_extension())
             self.distribution.ext_modules = exts
         else:
             h = os.path.join(get_python_inc(), 'Python.h')
             if not os.path.exists(h):
                 raise SystemExit(
                     'Python headers are required to build '
                     'Mercurial but weren\'t found in %s' % h
                 )
 
     def run(self):
         basepath = os.path.join(self.build_lib, 'mercurial')
         self.mkpath(basepath)
 
         rust = self.distribution.rust
         if self.distribution.pure:
             modulepolicy = 'py'
         elif self.build_lib == '.':
             # in-place build should run without rebuilding and Rust extensions
             modulepolicy = 'rust+c-allow' if rust else 'allow'
         else:
             modulepolicy = 'rust+c' if rust else 'c'
 
         content = b''.join(
             [
                 b'# this file is autogenerated by setup.py\n',
                 b'modulepolicy = b"%s"\n' % modulepolicy.encode('ascii'),
             ]
         )
         write_if_changed(os.path.join(basepath, '__modulepolicy__.py'), content)
 
         build_py.run(self)
 
 
 class buildhgextindex(Command):
     description = 'generate prebuilt index of hgext (for frozen package)'
     user_options = []
     _indexfilename = 'hgext/__index__.py'
 
     def initialize_options(self):
         pass
 
     def finalize_options(self):
         pass
 
     def run(self):
         if os.path.exists(self._indexfilename):
             with open(self._indexfilename, 'w') as f:
                 f.write('# empty\n')
 
         # here no extension enabled, disabled() lists up everything
         code = (
             'import pprint; from mercurial import extensions; '
             'ext = extensions.disabled();'
             'ext.pop("__index__", None);'
             'pprint.pprint(ext)'
         )
         returncode, out, err = runcmd(
             [sys.executable, '-c', code], localhgenv()
         )
         if err or returncode != 0:
             raise DistutilsExecError(err)
 
         with open(self._indexfilename, 'wb') as f:
             f.write(b'# this file is autogenerated by setup.py\n')
             f.write(b'docs = ')
             f.write(out)
 
 
 class buildhgexe(build_ext):
     description = 'compile hg.exe from mercurial/exewrapper.c'
 
     LONG_PATHS_MANIFEST = """\
 <?xml version="1.0" encoding="UTF-8" standalone="yes"?>
 <assembly xmlns="urn:schemas-microsoft-com:asm.v1" manifestVersion="1.0">
   <trustInfo xmlns="urn:schemas-microsoft-com:asm.v3">
     <security>
       <requestedPrivileges>
         <requestedExecutionLevel
           level="asInvoker"
           uiAccess="false"
         />
       </requestedPrivileges>
     </security>
   </trustInfo>
   <compatibility xmlns="urn:schemas-microsoft-com:compatibility.v1">
     <application>
       <!-- Windows Vista -->
       <supportedOS Id="{e2011457-1546-43c5-a5fe-008deee3d3f0}"/>
       <!-- Windows 7 -->
       <supportedOS Id="{35138b9a-5d96-4fbd-8e2d-a2440225f93a}"/>
       <!-- Windows 8 -->
       <supportedOS Id="{4a2f28e3-53b9-4441-ba9c-d69d4a4a6e38}"/>
       <!-- Windows 8.1 -->
       <supportedOS Id="{1f676c76-80e1-4239-95bb-83d0f6d0da78}"/>
       <!-- Windows 10 and Windows 11 -->
       <supportedOS Id="{8e0f7a12-bfb3-4fe8-b9a5-48fd50a15a9a}"/>
     </application>
   </compatibility>
   <application xmlns="urn:schemas-microsoft-com:asm.v3">
     <windowsSettings
         xmlns:ws2="http://schemas.microsoft.com/SMI/2016/WindowsSettings">
       <ws2:longPathAware>true</ws2:longPathAware>
     </windowsSettings>
   </application>
   <dependency>
     <dependentAssembly>
       <assemblyIdentity type="win32"
                         name="Microsoft.Windows.Common-Controls"
                         version="6.0.0.0"
                         processorArchitecture="*"
                         publicKeyToken="6595b64144ccf1df"
                         language="*" />
     </dependentAssembly>
   </dependency>
 </assembly>
 """
 
     def initialize_options(self):
         build_ext.initialize_options(self)
 
     def build_extensions(self):
         if os.name != 'nt':
             return
         if isinstance(self.compiler, HackedMingw32CCompiler):
             self.compiler.compiler_so = self.compiler.compiler  # no -mdll
             self.compiler.dll_libraries = []  # no -lmsrvc90
 
         pythonlib = None
 
         dirname = os.path.dirname(self.get_ext_fullpath('dummy'))
         self.hgtarget = os.path.join(dirname, 'hg')
 
         if getattr(sys, 'dllhandle', None):
             # Different Python installs can have different Python library
             # names. e.g. the official CPython distribution uses pythonXY.dll
             # and MinGW uses libpythonX.Y.dll.
             _kernel32 = ctypes.windll.kernel32
             _kernel32.GetModuleFileNameA.argtypes = [
                 ctypes.c_void_p,
                 ctypes.c_void_p,
                 ctypes.c_ulong,
             ]
             _kernel32.GetModuleFileNameA.restype = ctypes.c_ulong
             size = 1000
             buf = ctypes.create_string_buffer(size + 1)
             filelen = _kernel32.GetModuleFileNameA(
                 sys.dllhandle, ctypes.byref(buf), size
             )
 
             if filelen > 0 and filelen != size:
                 dllbasename = os.path.basename(buf.value)
                 if not dllbasename.lower().endswith(b'.dll'):
                     raise SystemExit(
                         'Python DLL does not end with .dll: %s' % dllbasename
                     )
                 pythonlib = dllbasename[:-4]
 
                 # Copy the pythonXY.dll next to the binary so that it runs
                 # without tampering with PATH.
                 dest = os.path.join(
                     os.path.dirname(self.hgtarget),
                     os.fsdecode(dllbasename),
                 )
 
                 if not os.path.exists(dest):
                     shutil.copy(buf.value, dest)
 
                 # Also overwrite python3.dll so that hgext.git is usable.
                 # TODO: also handle the MSYS flavor
                 python_x = os.path.join(
                     os.path.dirname(os.fsdecode(buf.value)),
                     "python3.dll",
                 )
 
                 if os.path.exists(python_x):
                     dest = os.path.join(
                         os.path.dirname(self.hgtarget),
                         os.path.basename(python_x),
                     )
 
                     shutil.copy(python_x, dest)
 
         if not pythonlib:
             log.warn(
                 'could not determine Python DLL filename; assuming pythonXY'
             )
 
             hv = sys.hexversion
             pythonlib = b'python%d%d' % (hv >> 24, (hv >> 16) & 0xFF)
 
         log.info('using %s as Python library name' % pythonlib)
         with open('mercurial/hgpythonlib.h', 'wb') as f:
             f.write(b'/* this file is autogenerated by setup.py */\n')
             f.write(b'#define HGPYTHONLIB "%s"\n' % pythonlib)
 
         objects = self.compiler.compile(
             ['mercurial/exewrapper.c'],
             output_dir=self.build_temp,
             macros=[('_UNICODE', None), ('UNICODE', None)],
         )
         self.compiler.link_executable(
             objects, self.hgtarget, libraries=[], output_dir=self.build_temp
         )
 
         self.addlongpathsmanifest()
 
     def addlongpathsmanifest(self):
         """Add manifest pieces so that hg.exe understands long paths
 
         Why resource #1 should be used for .exe manifests? I don't know and
         wasn't able to find an explanation for mortals. But it seems to work.
         """
         exefname = self.compiler.executable_filename(self.hgtarget)
         fdauto, manfname = tempfile.mkstemp(suffix='.hg.exe.manifest')
         os.close(fdauto)
         with open(manfname, 'w', encoding="UTF-8") as f:
             f.write(self.LONG_PATHS_MANIFEST)
         log.info("long paths manifest is written to '%s'" % manfname)
         outputresource = '-outputresource:%s;#1' % exefname
         log.info("running mt.exe to update hg.exe's manifest in-place")
 
         self.spawn(
             [
                 self.compiler.mt,
                 '-nologo',
                 '-manifest',
                 manfname,
                 outputresource,
             ]
         )
         log.info("done updating hg.exe's manifest")
         os.remove(manfname)
 
     @property
     def hgexepath(self):
         dir = os.path.dirname(self.get_ext_fullpath('dummy'))
         return os.path.join(self.build_temp, dir, 'hg.exe')
 
 
 class hgbuilddoc(Command):
     description = 'build documentation'
     user_options = [
         ('man', None, 'generate man pages'),
         ('html', None, 'generate html pages'),
     ]
 
     def initialize_options(self):
         self.man = None
         self.html = None
 
     def finalize_options(self):
         # If --man or --html are set, only generate what we're told to.
         # Otherwise generate everything.
         have_subset = self.man is not None or self.html is not None
 
         if have_subset:
             self.man = True if self.man else False
             self.html = True if self.html else False
         else:
             self.man = True
             self.html = True
 
     def run(self):
         def normalizecrlf(p):
             with open(p, 'rb') as fh:
                 orig = fh.read()
 
             if b'\r\n' not in orig:
                 return
 
             log.info('normalizing %s to LF line endings' % p)
             with open(p, 'wb') as fh:
                 fh.write(orig.replace(b'\r\n', b'\n'))
 
         def gentxt(root):
             txt = 'doc/%s.txt' % root
             log.info('generating %s' % txt)
             res, out, err = runcmd(
                 [sys.executable, 'gendoc.py', root], os.environ, cwd='doc'
             )
             if res:
                 raise SystemExit(
                     'error running gendoc.py: %s'
                     % '\n'.join([sysstr(out), sysstr(err)])
                 )
 
             with open(txt, 'wb') as fh:
                 fh.write(out)
 
         def gengendoc(root):
             gendoc = 'doc/%s.gendoc.txt' % root
 
             log.info('generating %s' % gendoc)
             res, out, err = runcmd(
                 [sys.executable, 'gendoc.py', '%s.gendoc' % root],
                 os.environ,
                 cwd='doc',
             )
             if res:
                 raise SystemExit(
                     'error running gendoc: %s'
                     % '\n'.join([sysstr(out), sysstr(err)])
                 )
 
             with open(gendoc, 'wb') as fh:
                 fh.write(out)
 
         def genman(root):
             log.info('generating doc/%s' % root)
             res, out, err = runcmd(
                 [
                     sys.executable,
                     'runrst',
                     'hgmanpage',
                     '--halt',
                     'warning',
                     '--strip-elements-with-class',
                     'htmlonly',
                     '%s.txt' % root,
                     root,
                 ],
                 os.environ,
                 cwd='doc',
             )
             if res:
                 raise SystemExit(
                     'error running runrst: %s'
                     % '\n'.join([sysstr(out), sysstr(err)])
                 )
 
             normalizecrlf('doc/%s' % root)
 
         def genhtml(root):
             log.info('generating doc/%s.html' % root)
             res, out, err = runcmd(
                 [
                     sys.executable,
                     'runrst',
                     'html',
                     '--halt',
                     'warning',
                     '--link-stylesheet',
                     '--stylesheet-path',
                     'style.css',
                     '%s.txt' % root,
                     '%s.html' % root,
                 ],
                 os.environ,
                 cwd='doc',
             )
             if res:
                 raise SystemExit(
                     'error running runrst: %s'
                     % '\n'.join([sysstr(out), sysstr(err)])
                 )
 
             normalizecrlf('doc/%s.html' % root)
 
         # This logic is duplicated in doc/Makefile.
         sources = {
             f
             for f in os.listdir('mercurial/helptext')
             if re.search(r'[0-9]\.txt$', f)
         }
 
         # common.txt is a one-off.
         gentxt('common')
 
         for source in sorted(sources):
             assert source[-4:] == '.txt'
             root = source[:-4]
 
             gentxt(root)
             gengendoc(root)
 
             if self.man:
                 genman(root)
             if self.html:
                 genhtml(root)
 
 
 class hginstall(install):
 
     user_options = install.user_options + [
         (
             'old-and-unmanageable',
             None,
             'noop, present for eggless setuptools compat',
         ),
         (
             'single-version-externally-managed',
             None,
             'noop, present for eggless setuptools compat',
         ),
     ]
 
     sub_commands = install.sub_commands + [
         ('install_completion', lambda self: True)
     ]
 
     # Also helps setuptools not be sad while we refuse to create eggs.
     single_version_externally_managed = True
 
     def get_sub_commands(self):
         # Screen out egg related commands to prevent egg generation.  But allow
         # mercurial.egg-info generation, since that is part of modern
         # packaging.
         excl = {'bdist_egg'}
         return filter(lambda x: x not in excl, install.get_sub_commands(self))
 
 
 class hginstalllib(install_lib):
     """
     This is a specialization of install_lib that replaces the copy_file used
     there so that it supports setting the mode of files after copying them,
     instead of just preserving the mode that the files originally had.  If your
     system has a umask of something like 027, preserving the permissions when
     copying will lead to a broken install.
 
     Note that just passing keep_permissions=False to copy_file would be
     insufficient, as it might still be applying a umask.
     """
 
     def run(self):
         realcopyfile = file_util.copy_file
 
         def copyfileandsetmode(*args, **kwargs):
             src, dst = args[0], args[1]
             dst, copied = realcopyfile(*args, **kwargs)
             if copied:
                 st = os.stat(src)
                 # Persist executable bit (apply it to group and other if user
                 # has it)
                 if st[stat.ST_MODE] & stat.S_IXUSR:
                     setmode = int('0755', 8)
                 else:
                     setmode = int('0644', 8)
                 m = stat.S_IMODE(st[stat.ST_MODE])
                 m = (m & ~int('0777', 8)) | setmode
                 os.chmod(dst, m)
 
         file_util.copy_file = copyfileandsetmode
         try:
             install_lib.run(self)
         finally:
             file_util.copy_file = realcopyfile
 
 
 class hginstallscripts(install_scripts):
     """
     This is a specialization of install_scripts that replaces the @LIBDIR@ with
     the configured directory for modules. If possible, the path is made relative
     to the directory for scripts.
     """
 
     def initialize_options(self):
         install_scripts.initialize_options(self)
 
         self.install_lib = None
 
     def finalize_options(self):
         install_scripts.finalize_options(self)
         self.set_undefined_options('install', ('install_lib', 'install_lib'))
 
     def run(self):
         install_scripts.run(self)
 
         # It only makes sense to replace @LIBDIR@ with the install path if
         # the install path is known. For wheels, the logic below calculates
         # the libdir to be "../..". This is because the internal layout of a
         # wheel archive looks like:
         #
         #   mercurial-3.6.1.data/scripts/hg
         #   mercurial/__init__.py
         #
         # When installing wheels, the subdirectories of the "<pkg>.data"
         # directory are translated to system local paths and files therein
         # are copied in place. The mercurial/* files are installed into the
         # site-packages directory. However, the site-packages directory
         # isn't known until wheel install time. This means we have no clue
         # at wheel generation time what the installed site-packages directory
         # will be. And, wheels don't appear to provide the ability to register
         # custom code to run during wheel installation. This all means that
         # we can't reliably set the libdir in wheels: the default behavior
         # of looking in sys.path must do.
 
         if (
             os.path.splitdrive(self.install_dir)[0]
             != os.path.splitdrive(self.install_lib)[0]
         ):
             # can't make relative paths from one drive to another, so use an
             # absolute path instead
             libdir = self.install_lib
         else:
             libdir = os.path.relpath(self.install_lib, self.install_dir)
 
         for outfile in self.outfiles:
             with open(outfile, 'rb') as fp:
                 data = fp.read()
 
             # skip binary files
             if b'\0' in data:
                 continue
 
             # During local installs, the shebang will be rewritten to the final
             # install path. During wheel packaging, the shebang has a special
             # value.
             if data.startswith(b'#!python'):
                 log.info(
                     'not rewriting @LIBDIR@ in %s because install path '
                     'not known' % outfile
                 )
                 continue
 
             data = data.replace(b'@LIBDIR@', libdir.encode('unicode_escape'))
             with open(outfile, 'wb') as fp:
                 fp.write(data)
 
 
 class hginstallcompletion(Command):
     description = 'Install shell completion'
 
     def initialize_options(self):
         self.install_dir = None
         self.outputs = []
 
     def finalize_options(self):
         self.set_undefined_options(
             'install_data', ('install_dir', 'install_dir')
         )
 
     def get_outputs(self):
         return self.outputs
 
     def run(self):
         for src, dir_path, dest in (
             (
                 'bash_completion',
                 ('share', 'bash-completion', 'completions'),
                 'hg',
             ),
             ('zsh_completion', ('share', 'zsh', 'site-functions'), '_hg'),
         ):
             dir = os.path.join(self.install_dir, *dir_path)
             self.mkpath(dir)
 
             dest = os.path.join(dir, dest)
             self.outputs.append(dest)
             self.copy_file(os.path.join('contrib', src), dest)
 
 
 # virtualenv installs custom distutils/__init__.py and
 # distutils/distutils.cfg files which essentially proxy back to the
 # "real" distutils in the main Python install. The presence of this
 # directory causes py2exe to pick up the "hacked" distutils package
 # from the virtualenv and "import distutils" will fail from the py2exe
 # build because the "real" distutils files can't be located.
 #
 # We work around this by monkeypatching the py2exe code finding Python
 # modules to replace the found virtualenv distutils modules with the
 # original versions via filesystem scanning. This is a bit hacky. But
 # it allows us to use virtualenvs for py2exe packaging, which is more
 # deterministic and reproducible.
 #
 # It's worth noting that the common StackOverflow suggestions for this
 # problem involve copying the original distutils files into the
 # virtualenv or into the staging directory after setup() is invoked.
 # The former is very brittle and can easily break setup(). Our hacking
 # of the found modules routine has a similar result as copying the files
 # manually. But it makes fewer assumptions about how py2exe works and
 # is less brittle.
 
 # This only catches virtualenvs made with virtualenv (as opposed to
 # venv, which is likely what Python 3 uses).
 py2exehacked = py2exeloaded and getattr(sys, 'real_prefix', None) is not None
 
 if py2exehacked:
     from distutils.command.py2exe import py2exe as buildpy2exe
     from py2exe.mf import Module as py2exemodule
 
     class hgbuildpy2exe(buildpy2exe):
         def find_needed_modules(self, mf, files, modules):
             res = buildpy2exe.find_needed_modules(self, mf, files, modules)
 
             # Replace virtualenv's distutils modules with the real ones.
             modules = {}
             for k, v in res.modules.items():
                 if k != 'distutils' and not k.startswith('distutils.'):
                     modules[k] = v
 
             res.modules = modules
 
             import opcode
 
             distutilsreal = os.path.join(
                 os.path.dirname(opcode.__file__), 'distutils'
             )
 
             for root, dirs, files in os.walk(distutilsreal):
                 for f in sorted(files):
                     if not f.endswith('.py'):
                         continue
 
                     full = os.path.join(root, f)
 
                     parents = ['distutils']
 
                     if root != distutilsreal:
                         rel = os.path.relpath(root, distutilsreal)
                         parents.extend(p for p in rel.split(os.sep))
 
                     modname = '%s.%s' % ('.'.join(parents), f[:-3])
 
                     if modname.startswith('distutils.tests.'):
                         continue
 
                     if modname.endswith('.__init__'):
                         modname = modname[: -len('.__init__')]
                         path = os.path.dirname(full)
                     else:
                         path = None
 
                     res.modules[modname] = py2exemodule(
                         modname, full, path=path
                     )
 
             if 'distutils' not in res.modules:
                 raise SystemExit('could not find distutils modules')
 
             return res
 
 
 cmdclass = {
     'build': hgbuild,
     'build_doc': hgbuilddoc,
     'build_mo': hgbuildmo,
     'build_ext': hgbuildext,
     'build_py': hgbuildpy,
     'build_scripts': hgbuildscripts,
     'build_hgextindex': buildhgextindex,
     'install': hginstall,
     'install_completion': hginstallcompletion,
     'install_lib': hginstalllib,
     'install_scripts': hginstallscripts,
     'build_hgexe': buildhgexe,
 }
 
 if py2exehacked:
     cmdclass['py2exe'] = hgbuildpy2exe
 
 packages = [
     'mercurial',
     'mercurial.cext',
     'mercurial.cffi',
     'mercurial.defaultrc',
     'mercurial.dirstateutils',
     'mercurial.helptext',
     'mercurial.helptext.internals',
     'mercurial.hgweb',
     'mercurial.interfaces',
     'mercurial.pure',
+    'mercurial.stabletailgraph',
     'mercurial.templates',
     'mercurial.thirdparty',
     'mercurial.thirdparty.attr',
     'mercurial.thirdparty.jaraco',
     'mercurial.thirdparty.zope',
     'mercurial.thirdparty.zope.interface',
     'mercurial.upgrade_utils',
     'mercurial.utils',
     'mercurial.revlogutils',
     'mercurial.testing',
     'hgext',
     'hgext.convert',
     'hgext.fsmonitor',
     'hgext.fastannotate',
     'hgext.fsmonitor.pywatchman',
     'hgext.git',
     'hgext.highlight',
     'hgext.hooklib',
     'hgext.infinitepush',
     'hgext.largefiles',
     'hgext.lfs',
     'hgext.narrow',
     'hgext.remotefilelog',
     'hgext.zeroconf',
     'hgext3rd',
     'hgdemandimport',
 ]
 
 for name in os.listdir(os.path.join('mercurial', 'templates')):
     if name != '__pycache__' and os.path.isdir(
         os.path.join('mercurial', 'templates', name)
     ):
         packages.append('mercurial.templates.%s' % name)
 
 if 'HG_PY2EXE_EXTRA_INSTALL_PACKAGES' in os.environ:
     # py2exe can't cope with namespace packages very well, so we have to
     # install any hgext3rd.* extensions that we want in the final py2exe
     # image here. This is gross, but you gotta do what you gotta do.
     packages.extend(os.environ['HG_PY2EXE_EXTRA_INSTALL_PACKAGES'].split(' '))
 
 common_depends = [
     'mercurial/bitmanipulation.h',
     'mercurial/compat.h',
     'mercurial/cext/util.h',
 ]
 common_include_dirs = ['mercurial']
 
 common_cflags = []
 
 # MSVC 2008 still needs declarations at the top of the scope, but Python 3.9
 # makes declarations not at the top of a scope in the headers.
 if os.name != 'nt' and sys.version_info[1] < 9:
     common_cflags = ['-Werror=declaration-after-statement']
 
 osutil_cflags = []
 osutil_ldflags = []
 
 # platform specific macros
 for plat, func in [('bsd', 'setproctitle')]:
     if re.search(plat, sys.platform) and hasfunction(new_compiler(), func):
         osutil_cflags.append('-DHAVE_%s' % func.upper())
 
 for plat, macro, code in [
     (
         'bsd|darwin',
         'BSD_STATFS',
         '''
      #include <sys/param.h>
      #include <sys/mount.h>
      int main() { struct statfs s; return sizeof(s.f_fstypename); }
      ''',
     ),
     (
         'linux',
         'LINUX_STATFS',
         '''
      #include <linux/magic.h>
      #include <sys/vfs.h>
      int main() { struct statfs s; return sizeof(s.f_type); }
      ''',
     ),
 ]:
     if re.search(plat, sys.platform) and cancompile(new_compiler(), code):
         osutil_cflags.append('-DHAVE_%s' % macro)
 
 if sys.platform == 'darwin':
     osutil_ldflags += ['-framework', 'ApplicationServices']
 
 if sys.platform == 'sunos5':
     osutil_ldflags += ['-lsocket']
 
 xdiff_srcs = [
     'mercurial/thirdparty/xdiff/xdiffi.c',
     'mercurial/thirdparty/xdiff/xprepare.c',
     'mercurial/thirdparty/xdiff/xutils.c',
 ]
 
 xdiff_headers = [
     'mercurial/thirdparty/xdiff/xdiff.h',
     'mercurial/thirdparty/xdiff/xdiffi.h',
     'mercurial/thirdparty/xdiff/xinclude.h',
     'mercurial/thirdparty/xdiff/xmacros.h',
     'mercurial/thirdparty/xdiff/xprepare.h',
     'mercurial/thirdparty/xdiff/xtypes.h',
     'mercurial/thirdparty/xdiff/xutils.h',
 ]
 
 
 class RustCompilationError(CCompilerError):
     """Exception class for Rust compilation errors."""
 
 
 class RustExtension(Extension):
     """Base classes for concrete Rust Extension classes."""
 
     rusttargetdir = os.path.join('rust', 'target', 'release')
 
     def __init__(self, mpath, sources, rustlibname, subcrate, **kw):
         Extension.__init__(self, mpath, sources, **kw)
         srcdir = self.rustsrcdir = os.path.join('rust', subcrate)
 
         # adding Rust source and control files to depends so that the extension
         # gets rebuilt if they've changed
         self.depends.append(os.path.join(srcdir, 'Cargo.toml'))
         cargo_lock = os.path.join(srcdir, 'Cargo.lock')
         if os.path.exists(cargo_lock):
             self.depends.append(cargo_lock)
         for dirpath, subdir, fnames in os.walk(os.path.join(srcdir, 'src')):
             self.depends.extend(
                 os.path.join(dirpath, fname)
                 for fname in fnames
                 if os.path.splitext(fname)[1] == '.rs'
             )
 
     @staticmethod
     def rustdylibsuffix():
         """Return the suffix for shared libraries produced by rustc.
 
         See also: https://doc.rust-lang.org/reference/linkage.html
         """
         if sys.platform == 'darwin':
             return '.dylib'
         elif os.name == 'nt':
             return '.dll'
         else:
             return '.so'
 
     def rustbuild(self):
         env = os.environ.copy()
         if 'HGTEST_RESTOREENV' in env:
             # Mercurial tests change HOME to a temporary directory,
             # but, if installed with rustup, the Rust toolchain needs
             # HOME to be correct (otherwise the 'no default toolchain'
             # error message is issued and the build fails).
             # This happens currently with test-hghave.t, which does
             # invoke this build.
 
             # Unix only fix (os.path.expanduser not really reliable if
             # HOME is shadowed like this)
             import pwd
 
             env['HOME'] = pwd.getpwuid(os.getuid()).pw_dir
 
         cargocmd = ['cargo', 'rustc', '--release']
 
         rust_features = env.get("HG_RUST_FEATURES")
         if rust_features:
             cargocmd.extend(('--features', rust_features))
 
         cargocmd.append('--')
         if sys.platform == 'darwin':
             cargocmd.extend(
                 ("-C", "link-arg=-undefined", "-C", "link-arg=dynamic_lookup")
             )
         try:
             subprocess.check_call(cargocmd, env=env, cwd=self.rustsrcdir)
         except FileNotFoundError:
             raise RustCompilationError("Cargo not found")
         except PermissionError:
             raise RustCompilationError(
                 "Cargo found, but permission to execute it is denied"
             )
         except subprocess.CalledProcessError:
             raise RustCompilationError(
                 "Cargo failed. Working directory: %r, "
                 "command: %r, environment: %r"
                 % (self.rustsrcdir, cargocmd, env)
             )
 
 
 class RustStandaloneExtension(RustExtension):
     def __init__(self, pydottedname, rustcrate, dylibname, **kw):
         RustExtension.__init__(
             self, pydottedname, [], dylibname, rustcrate, **kw
         )
         self.dylibname = dylibname
 
     def build(self, target_dir):
         self.rustbuild()
         target = [target_dir]
         target.extend(self.name.split('.'))
         target[-1] += DYLIB_SUFFIX
         target = os.path.join(*target)
         os.makedirs(os.path.dirname(target), exist_ok=True)
         shutil.copy2(
             os.path.join(
                 self.rusttargetdir, self.dylibname + self.rustdylibsuffix()
             ),
             target,
         )
 
 
 extmodules = [
     Extension(
         'mercurial.cext.base85',
         ['mercurial/cext/base85.c'],
         include_dirs=common_include_dirs,
         extra_compile_args=common_cflags,
         depends=common_depends,
     ),
     Extension(
         'mercurial.cext.bdiff',
         ['mercurial/bdiff.c', 'mercurial/cext/bdiff.c'] + xdiff_srcs,
         include_dirs=common_include_dirs,
         extra_compile_args=common_cflags,
         depends=common_depends + ['mercurial/bdiff.h'] + xdiff_headers,
     ),
     Extension(
         'mercurial.cext.mpatch',
         ['mercurial/mpatch.c', 'mercurial/cext/mpatch.c'],
         include_dirs=common_include_dirs,
         extra_compile_args=common_cflags,
         depends=common_depends,
     ),
     Extension(
         'mercurial.cext.parsers',
         [
             'mercurial/cext/charencode.c',
             'mercurial/cext/dirs.c',
             'mercurial/cext/manifest.c',
             'mercurial/cext/parsers.c',
             'mercurial/cext/pathencode.c',
             'mercurial/cext/revlog.c',
         ],
         include_dirs=common_include_dirs,
         extra_compile_args=common_cflags,
         depends=common_depends
         + [
             'mercurial/cext/charencode.h',
             'mercurial/cext/revlog.h',
         ],
     ),
     Extension(
         'mercurial.cext.osutil',
         ['mercurial/cext/osutil.c'],
         include_dirs=common_include_dirs,
         extra_compile_args=common_cflags + osutil_cflags,
         extra_link_args=osutil_ldflags,
         depends=common_depends,
     ),
     Extension(
         'mercurial.thirdparty.zope.interface._zope_interface_coptimizations',
         [
             'mercurial/thirdparty/zope/interface/_zope_interface_coptimizations.c',
         ],
         extra_compile_args=common_cflags,
     ),
     Extension(
         'mercurial.thirdparty.sha1dc',
         [
             'mercurial/thirdparty/sha1dc/cext.c',
             'mercurial/thirdparty/sha1dc/lib/sha1.c',
             'mercurial/thirdparty/sha1dc/lib/ubc_check.c',
         ],
         extra_compile_args=common_cflags,
     ),
     Extension(
         'hgext.fsmonitor.pywatchman.bser',
         ['hgext/fsmonitor/pywatchman/bser.c'],
         extra_compile_args=common_cflags,
     ),
     RustStandaloneExtension(
         'mercurial.rustext',
         'hg-cpython',
         'librusthg',
     ),
 ]
 
 
 sys.path.insert(0, 'contrib/python-zstandard')
 import setup_zstd
 
 zstd = setup_zstd.get_c_extension(
     name='mercurial.zstd', root=os.path.abspath(os.path.dirname(__file__))
 )
 zstd.extra_compile_args += common_cflags
 extmodules.append(zstd)
 
 try:
     from distutils import cygwinccompiler
 
     # the -mno-cygwin option has been deprecated for years
     mingw32compilerclass = cygwinccompiler.Mingw32CCompiler
 
     class HackedMingw32CCompiler(cygwinccompiler.Mingw32CCompiler):
         def __init__(self, *args, **kwargs):
             mingw32compilerclass.__init__(self, *args, **kwargs)
             for i in 'compiler compiler_so linker_exe linker_so'.split():
                 try:
                     getattr(self, i).remove('-mno-cygwin')
                 except ValueError:
                     pass
 
     cygwinccompiler.Mingw32CCompiler = HackedMingw32CCompiler
 except ImportError:
     # the cygwinccompiler package is not available on some Python
     # distributions like the ones from the optware project for Synology
     # DiskStation boxes
     class HackedMingw32CCompiler:
         pass
 
 
 if os.name == 'nt':
     # Allow compiler/linker flags to be added to Visual Studio builds.  Passing
     # extra_link_args to distutils.extensions.Extension() doesn't have any
     # effect.
     from distutils import msvccompiler
 
     msvccompilerclass = msvccompiler.MSVCCompiler
 
     class HackedMSVCCompiler(msvccompiler.MSVCCompiler):
         def initialize(self):
             msvccompilerclass.initialize(self)
             # "warning LNK4197: export 'func' specified multiple times"
             self.ldflags_shared.append('/ignore:4197')
             self.ldflags_shared_debug.append('/ignore:4197')
 
     msvccompiler.MSVCCompiler = HackedMSVCCompiler
 
 packagedata = {
     'mercurial': [
         'locale/*/LC_MESSAGES/hg.mo',
         'dummycert.pem',
     ],
     'mercurial.defaultrc': [
         '*.rc',
     ],
     'mercurial.helptext': [
         '*.txt',
     ],
     'mercurial.helptext.internals': [
         '*.txt',
     ],
     'mercurial.thirdparty.attr': [
         '*.pyi',
         'py.typed',
     ],
 }
 
 
 def ordinarypath(p):
     return p and p[0] != '.' and p[-1] != '~'
 
 
 for root in ('templates',):
     for curdir, dirs, files in os.walk(os.path.join('mercurial', root)):
         packagename = curdir.replace(os.sep, '.')
         packagedata[packagename] = list(filter(ordinarypath, files))
 
 datafiles = []
 
 # distutils expects version to be str/unicode. Converting it to
 # unicode on Python 2 still works because it won't contain any
 # non-ascii bytes and will be implicitly converted back to bytes
 # when operated on.
 assert isinstance(version, str)
 setupversion = version
 
 extra = {}
 
 py2exepackages = [
     'hgdemandimport',
     'hgext3rd',
     'hgext',
     'email',
     # implicitly imported per module policy
     # (cffi wouldn't be used as a frozen exe)
     'mercurial.cext',
     #'mercurial.cffi',
     'mercurial.pure',
 ]
 
 py2exe_includes = []
 
 py2exeexcludes = []
 py2exedllexcludes = ['crypt32.dll']
 
 if issetuptools:
     extra['python_requires'] = supportedpy
 
 if py2exeloaded:
     extra['console'] = [
         {
             'script': 'hg',
             'copyright': 'Copyright (C) 2005-2023 Olivia Mackall and others',
             'product_version': version,
         }
     ]
     # Sub command of 'build' because 'py2exe' does not handle sub_commands.
     # Need to override hgbuild because it has a private copy of
     # build.sub_commands.
     hgbuild.sub_commands.insert(0, ('build_hgextindex', None))
     # put dlls in sub directory so that they won't pollute PATH
     extra['zipfile'] = 'lib/library.zip'
 
     # We allow some configuration to be supplemented via environment
     # variables. This is better than setup.cfg files because it allows
     # supplementing configs instead of replacing them.
     extrapackages = os.environ.get('HG_PY2EXE_EXTRA_PACKAGES')
     if extrapackages:
         py2exepackages.extend(extrapackages.split(' '))
 
     extra_includes = os.environ.get('HG_PY2EXE_EXTRA_INCLUDES')
     if extra_includes:
         py2exe_includes.extend(extra_includes.split(' '))
 
     excludes = os.environ.get('HG_PY2EXE_EXTRA_EXCLUDES')
     if excludes:
         py2exeexcludes.extend(excludes.split(' '))
 
     dllexcludes = os.environ.get('HG_PY2EXE_EXTRA_DLL_EXCLUDES')
     if dllexcludes:
         py2exedllexcludes.extend(dllexcludes.split(' '))
 
 if os.environ.get('PYOXIDIZER'):
     hgbuild.sub_commands.insert(0, ('build_hgextindex', None))
 
 if os.name == 'nt':
     # Windows binary file versions for exe/dll files must have the
     # form W.X.Y.Z, where W,X,Y,Z are numbers in the range 0..65535
     setupversion = setupversion.split(r'+', 1)[0]
 
 setup(
     name='mercurial',
     version=setupversion,
     author='Olivia Mackall and many others',
     author_email='[e-mail]',
     url='https://mercurial-scm.org/',
     download_url='https://mercurial-scm.org/release/',
     description=(
         'Fast scalable distributed SCM (revision control, version '
         'control) system'
     ),
     long_description=(
         'Mercurial is a distributed SCM tool written in Python.'
         ' It is used by a number of large projects that require'
         ' fast, reliable distributed revision control, such as '
         'Mozilla.'
     ),
     license='GNU GPLv2 or any later version',
     classifiers=[
         'Development Status :: 6 - Mature',
         'Environment :: Console',
         'Intended Audience :: Developers',
         'Intended Audience :: System Administrators',
         'License :: OSI Approved :: GNU General Public License (GPL)',
         'Natural Language :: Danish',
         'Natural Language :: English',
         'Natural Language :: German',
         'Natural Language :: Italian',
         'Natural Language :: Japanese',
         'Natural Language :: Portuguese (Brazilian)',
         'Operating System :: Microsoft :: Windows',
         'Operating System :: OS Independent',
         'Operating System :: POSIX',
         'Programming Language :: C',
         'Programming Language :: Python',
         'Topic :: Software Development :: Version Control',
     ],
     scripts=scripts,
     packages=packages,
     ext_modules=extmodules,
     data_files=datafiles,
     package_data=packagedata,
     cmdclass=cmdclass,
     distclass=hgdist,
     options={
         'py2exe': {
             'bundle_files': 3,
             'dll_excludes': py2exedllexcludes,
             'includes': py2exe_includes,
             'excludes': py2exeexcludes,
             'packages': py2exepackages,
         },
         'bdist_mpkg': {
             'zipdist': False,
             'license': 'COPYING',
             'readme': 'contrib/packaging/macosx/Readme.html',
             'welcome': 'contrib/packaging/macosx/Welcome.html',
         },
     },
     **extra
 )

tests/test-completion.t

@@ -1,451 +1,453 b''
 Show all commands except debug commands
   $ hg debugcomplete
   abort
   add
   addremove
   annotate
   archive
   backout
   bisect
   bookmarks
   branch
   branches
   bundle
   cat
   clone
   commit
   config
   continue
   copy
   diff
   export
   files
   forget
   graft
   grep
   heads
   help
   identify
   import
   incoming
   init
   locate
   log
   manifest
   merge
   outgoing
   parents
   paths
   phase
   pull
   purge
   push
   recover
   remove
   rename
   resolve
   revert
   rollback
   root
   serve
   shelve
   status
   summary
   tag
   tags
   tip
   unbundle
   unshelve
   update
   verify
   version
 
 Show all commands that start with "a"
   $ hg debugcomplete a
   abort
   add
   addremove
   annotate
   archive
 
 Do not show debug commands if there are other candidates
   $ hg debugcomplete d
   diff
 
 Show debug commands if there are no other candidates
   $ hg debugcomplete debug
   debug-delta-find
   debug-repair-issue6528
   debug-revlog-index
   debug-revlog-stats
+  debug::stable-tail-sort
   debugancestor
   debugantivirusrunning
   debugapplystreamclonebundle
   debugbackupbundle
   debugbuilddag
   debugbundle
   debugcapabilities
   debugchangedfiles
   debugcheckstate
   debugcolor
   debugcommands
   debugcomplete
   debugconfig
   debugcreatestreamclonebundle
   debugdag
   debugdata
   debugdate
   debugdeltachain
   debugdirstate
   debugdirstateignorepatternshash
   debugdiscovery
   debugdownload
   debugextensions
   debugfileset
   debugformat
   debugfsinfo
   debuggetbundle
   debugignore
   debugindexdot
   debugindexstats
   debuginstall
   debugknown
   debuglabelcomplete
   debuglocks
   debugmanifestfulltextcache
   debugmergestate
   debugnamecomplete
   debugnodemap
   debugobsolete
   debugp1copies
   debugp2copies
   debugpathcomplete
   debugpathcopies
   debugpeer
   debugpickmergetool
   debugpushkey
   debugpvec
   debugrebuilddirstate
   debugrebuildfncache
   debugrename
   debugrequires
   debugrevlog
   debugrevlogindex
   debugrevspec
   debugserve
   debugsetparents
   debugshell
   debugsidedata
   debugssl
   debugstrip
   debugsub
   debugsuccessorssets
   debugtagscache
   debugtemplate
   debuguigetpass
   debuguiprompt
   debugupdatecaches
   debugupgraderepo
   debugwalk
   debugwhyunstable
   debugwireargs
   debugwireproto
 
 Do not show the alias of a debug command if there are other candidates
 (this should hide rawcommit)
   $ hg debugcomplete r
   recover
   remove
   rename
   resolve
   revert
   rollback
   root
 Show the alias of a debug command if there are no other candidates
   $ hg debugcomplete rawc
   
 
 Show the global options
   $ hg debugcomplete --options | sort
   --color
   --config
   --cwd
   --debug
   --debugger
   --encoding
   --encodingmode
   --help
   --hidden
   --noninteractive
   --pager
   --profile
   --quiet
   --repository
   --time
   --traceback
   --verbose
   --version
   -R
   -h
   -q
   -v
   -y
 
 Show the options for the "serve" command
   $ hg debugcomplete --options serve | sort
   --accesslog
   --address
   --certificate
   --cmdserver
   --color
   --config
   --cwd
   --daemon
   --daemon-postexec
   --debug
   --debugger
   --encoding
   --encodingmode
   --errorlog
   --help
   --hidden
   --ipv6
   --name
   --noninteractive
   --pager
   --pid-file
   --port
   --prefix
   --print-url
   --profile
   --quiet
   --repository
   --stdio
   --style
   --subrepos
   --templates
   --time
   --traceback
   --verbose
   --version
   --web-conf
   -6
   -A
   -E
   -R
   -S
   -a
   -d
   -h
   -n
   -p
   -q
   -t
   -v
   -y
 
 Show an error if we use --options with an ambiguous abbreviation
   $ hg debugcomplete --options s
   hg: command 's' is ambiguous:
       serve shelve showconfig status summary
   [10]
 
 Show all commands + options
   $ hg debugcommands
   abort: dry-run
   add: include, exclude, subrepos, dry-run
   addremove: similarity, subrepos, include, exclude, dry-run
   annotate: rev, follow, no-follow, text, user, file, date, number, changeset, line-number, skip, ignore-all-space, ignore-space-change, ignore-blank-lines, ignore-space-at-eol, include, exclude, template
   archive: no-decode, prefix, rev, type, subrepos, include, exclude
   backout: merge, commit, no-commit, parent, rev, edit, tool, include, exclude, message, logfile, date, user
   bisect: reset, good, bad, skip, extend, command, noupdate
   bookmarks: force, rev, delete, rename, inactive, list, template
   branch: force, clean, rev
   branches: active, closed, rev, template
   bundle: exact, force, rev, branch, base, all, type, ssh, remotecmd, insecure
   cat: output, rev, decode, include, exclude, template
   clone: noupdate, updaterev, rev, branch, pull, uncompressed, stream, ssh, remotecmd, insecure
   commit: addremove, close-branch, amend, secret, draft, edit, force-close-branch, interactive, include, exclude, message, logfile, date, user, subrepos
   config: untrusted, exp-all-known, edit, local, source, shared, non-shared, global, template
   continue: dry-run
   copy: forget, after, at-rev, force, include, exclude, dry-run
   debug-delta-find: changelog, manifest, dir, template, source
   debug-repair-issue6528: to-report, from-report, paranoid, dry-run
   debug-revlog-index: changelog, manifest, dir, template
   debug-revlog-stats: changelog, manifest, filelogs, template
+  debug::stable-tail-sort: template
   debugancestor: 
   debugantivirusrunning: 
   debugapplystreamclonebundle: 
   debugbackupbundle: recover, patch, git, limit, no-merges, stat, graph, style, template
   debugbuilddag: mergeable-file, overwritten-file, new-file, from-existing
   debugbundle: all, part-type, spec
   debugcapabilities: 
   debugchangedfiles: compute
   debugcheckstate: 
   debugcolor: style
   debugcommands: 
   debugcomplete: options
   debugcreatestreamclonebundle: 
   debugdag: tags, branches, dots, spaces
   debugdata: changelog, manifest, dir
   debugdate: extended
   debugdeltachain: changelog, manifest, dir, template
   debugdirstateignorepatternshash: 
   debugdirstate: nodates, dates, datesort, docket, all
   debugdiscovery: old, nonheads, rev, seed, local-as-revs, remote-as-revs, ssh, remotecmd, insecure, template
   debugdownload: output
   debugextensions: template
   debugfileset: rev, all-files, show-matcher, show-stage
   debugformat: template
   debugfsinfo: 
   debuggetbundle: head, common, type
   debugignore: 
   debugindexdot: changelog, manifest, dir
   debugindexstats: 
   debuginstall: template
   debugknown: 
   debuglabelcomplete: 
   debuglocks: force-free-lock, force-free-wlock, set-lock, set-wlock
   debugmanifestfulltextcache: clear, add
   debugmergestate: style, template
   debugnamecomplete: 
   debugnodemap: dump-new, dump-disk, check, metadata
   debugobsolete: flags, record-parents, rev, exclusive, index, delete, date, user, template
   debugp1copies: rev
   debugp2copies: rev
   debugpathcomplete: full, normal, added, removed
   debugpathcopies: include, exclude
   debugpeer: 
   debugpickmergetool: rev, changedelete, include, exclude, tool
   debugpushkey: 
   debugpvec: 
   debugrebuilddirstate: rev, minimal
   debugrebuildfncache: only-data
   debugrename: rev
   debugrequires: 
   debugrevlog: changelog, manifest, dir, dump
   debugrevlogindex: changelog, manifest, dir, format
   debugrevspec: optimize, show-revs, show-set, show-stage, no-optimized, verify-optimized
   debugserve: sshstdio, logiofd, logiofile
   debugsetparents: 
   debugshell: command
   debugsidedata: changelog, manifest, dir
   debugssl: 
   debugstrip: rev, force, no-backup, nobackup, , keep, bookmark, soft
   debugsub: rev
   debugsuccessorssets: closest
   debugtagscache: 
   debugtemplate: rev, define
   debuguigetpass: prompt
   debuguiprompt: prompt
   debugupdatecaches: 
   debugupgraderepo: optimize, run, backup, changelog, manifest, filelogs
   debugwalk: include, exclude
   debugwhyunstable: 
   debugwireargs: three, four, five, ssh, remotecmd, insecure
   debugwireproto: localssh, peer, noreadstderr, nologhandshake, ssh, remotecmd, insecure
   diff: rev, from, to, change, text, git, binary, nodates, noprefix, show-function, reverse, ignore-all-space, ignore-space-change, ignore-blank-lines, ignore-space-at-eol, unified, stat, root, include, exclude, subrepos
   export: bookmark, output, switch-parent, rev, text, git, binary, nodates, template
   files: rev, print0, include, exclude, template, subrepos
   forget: interactive, include, exclude, dry-run
   graft: rev, base, continue, stop, abort, edit, log, no-commit, force, currentdate, currentuser, date, user, tool, dry-run
   grep: print0, all, diff, text, follow, ignore-case, files-with-matches, line-number, rev, all-files, user, date, template, include, exclude
   heads: rev, topo, active, closed, style, template
   help: extension, command, keyword, system
   identify: rev, num, id, branch, tags, bookmarks, ssh, remotecmd, insecure, template
   import: strip, base, secret, edit, force, no-commit, bypass, partial, exact, prefix, import-branch, message, logfile, date, user, similarity
   incoming: force, newest-first, bundle, rev, bookmarks, branch, patch, git, limit, no-merges, stat, graph, style, template, ssh, remotecmd, insecure, subrepos
   init: ssh, remotecmd, insecure
   locate: rev, print0, fullpath, include, exclude
   log: follow, follow-first, date, copies, keyword, rev, line-range, removed, only-merges, user, only-branch, branch, bookmark, prune, patch, git, limit, no-merges, stat, graph, style, template, include, exclude
   manifest: rev, all, template
   merge: force, rev, preview, abort, tool
   outgoing: force, rev, newest-first, bookmarks, branch, patch, git, limit, no-merges, stat, graph, style, template, ssh, remotecmd, insecure, subrepos
   parents: rev, style, template
   paths: template
   phase: public, draft, secret, force, rev
   pull: update, force, confirm, rev, bookmark, branch, ssh, remotecmd, insecure
   purge: abort-on-err, all, ignored, dirs, files, print, print0, confirm, include, exclude
   push: force, rev, bookmark, all-bookmarks, branch, new-branch, pushvars, publish, ssh, remotecmd, insecure
   recover: verify
   remove: after, force, subrepos, include, exclude, dry-run
   rename: forget, after, at-rev, force, include, exclude, dry-run
   resolve: all, list, mark, unmark, no-status, re-merge, tool, include, exclude, template
   revert: all, date, rev, no-backup, interactive, include, exclude, dry-run
   rollback: dry-run, force
   root: template
   serve: accesslog, daemon, daemon-postexec, errorlog, port, address, prefix, name, web-conf, webdir-conf, pid-file, stdio, cmdserver, templates, style, ipv6, certificate, print-url, subrepos
   shelve: addremove, unknown, cleanup, date, delete, edit, keep, list, message, name, patch, interactive, stat, include, exclude
   status: all, modified, added, removed, deleted, clean, unknown, ignored, no-status, terse, copies, print0, rev, change, include, exclude, subrepos, template
   summary: remote
   tag: force, local, rev, remove, edit, message, date, user
   tags: template
   tip: patch, git, style, template
   unbundle: update
   unshelve: abort, continue, interactive, keep, name, tool, date
   update: clean, check, merge, date, rev, tool
   verify: full
   version: template
 
   $ hg init a
   $ cd a
   $ echo fee > fee
   $ hg ci -q -Amfee
   $ hg tag fee
   $ mkdir fie
   $ echo dead > fie/dead
   $ echo live > fie/live
   $ hg bookmark fo
   $ hg branch -q fie
   $ hg ci -q -Amfie
   $ echo fo > fo
   $ hg branch -qf default
   $ hg ci -q -Amfo
   $ echo Fum > Fum
   $ hg ci -q -AmFum
   $ hg bookmark Fum
 
 Test debugpathcomplete
 
   $ hg debugpathcomplete f
   fee
   fie
   fo
   $ hg debugpathcomplete -f f
   fee
   fie/dead
   fie/live
   fo
 
   $ hg rm Fum
   $ hg debugpathcomplete -r F
   Fum
 
 Test debugnamecomplete
 
   $ hg debugnamecomplete
   Fum
   default
   fee
   fie
   fo
   tip
   $ hg debugnamecomplete f
   fee
   fie
   fo
 
 Test debuglabelcomplete, a deprecated name for debugnamecomplete that is still
 used for completions in some shells.
 
   $ hg debuglabelcomplete
   Fum
   default
   fee
   fie
   fo
   tip
   $ hg debuglabelcomplete f
   fee
   fie
   fo

tests/test-help.t

@@ -1,4077 +1,4079 b''
 Short help:
 
   $ hg
   Mercurial Distributed SCM
   
   basic commands:
   
    add           add the specified files on the next commit
    annotate      show changeset information by line for each file
    clone         make a copy of an existing repository
    commit        commit the specified files or all outstanding changes
    diff          diff repository (or selected files)
    export        dump the header and diffs for one or more changesets
    forget        forget the specified files on the next commit
    init          create a new repository in the given directory
    log           show revision history of entire repository or files
    merge         merge another revision into working directory
    pull          pull changes from the specified source
    push          push changes to the specified destination
    remove        remove the specified files on the next commit
    serve         start stand-alone webserver
    status        show changed files in the working directory
    summary       summarize working directory state
    update        update working directory (or switch revisions)
   
   (use 'hg help' for the full list of commands or 'hg -v' for details)
 
   $ hg -q
    add           add the specified files on the next commit
    annotate      show changeset information by line for each file
    clone         make a copy of an existing repository
    commit        commit the specified files or all outstanding changes
    diff          diff repository (or selected files)
    export        dump the header and diffs for one or more changesets
    forget        forget the specified files on the next commit
    init          create a new repository in the given directory
    log           show revision history of entire repository or files
    merge         merge another revision into working directory
    pull          pull changes from the specified source
    push          push changes to the specified destination
    remove        remove the specified files on the next commit
    serve         start stand-alone webserver
    status        show changed files in the working directory
    summary       summarize working directory state
    update        update working directory (or switch revisions)
 
 Extra extensions will be printed in help output in a non-reliable order since
 the extension is unknown.
 #if no-extraextensions
 
   $ hg help
   Mercurial Distributed SCM
   
   list of commands:
   
   Repository creation:
   
    clone         make a copy of an existing repository
    init          create a new repository in the given directory
   
   Remote repository management:
   
    incoming      show new changesets found in source
    outgoing      show changesets not found in the destination
    paths         show aliases for remote repositories
    pull          pull changes from the specified source
    push          push changes to the specified destination
    serve         start stand-alone webserver
   
   Change creation:
   
    commit        commit the specified files or all outstanding changes
   
   Change manipulation:
   
    backout       reverse effect of earlier changeset
    graft         copy changes from other branches onto the current branch
    merge         merge another revision into working directory
   
   Change organization:
   
    bookmarks     create a new bookmark or list existing bookmarks
    branch        set or show the current branch name
    branches      list repository named branches
    phase         set or show the current phase name
    tag           add one or more tags for the current or given revision
    tags          list repository tags
   
   File content management:
   
    annotate      show changeset information by line for each file
    cat           output the current or given revision of files
    copy          mark files as copied for the next commit
    diff          diff repository (or selected files)
    grep          search for a pattern in specified files
   
   Change navigation:
   
    bisect        subdivision search of changesets
    heads         show branch heads
    identify      identify the working directory or specified revision
    log           show revision history of entire repository or files
   
   Working directory management:
   
    add           add the specified files on the next commit
    addremove     add all new files, delete all missing files
    files         list tracked files
    forget        forget the specified files on the next commit
    purge         removes files not tracked by Mercurial
    remove        remove the specified files on the next commit
    rename        rename files; equivalent of copy + remove
    resolve       redo merges or set/view the merge status of files
    revert        restore files to their checkout state
    root          print the root (top) of the current working directory
    shelve        save and set aside changes from the working directory
    status        show changed files in the working directory
    summary       summarize working directory state
    unshelve      restore a shelved change to the working directory
    update        update working directory (or switch revisions)
   
   Change import/export:
   
    archive       create an unversioned archive of a repository revision
    bundle        create a bundle file
    export        dump the header and diffs for one or more changesets
    import        import an ordered set of patches
    unbundle      apply one or more bundle files
   
   Repository maintenance:
   
    manifest      output the current or given revision of the project manifest
    recover       roll back an interrupted transaction
    verify        verify the integrity of the repository
   
   Help:
   
    config        show combined config settings from all hgrc files
    help          show help for a given topic or a help overview
    version       output version and copyright information
   
   additional help topics:
   
   Mercurial identifiers:
   
    filesets      Specifying File Sets
    hgignore      Syntax for Mercurial Ignore Files
    patterns      File Name Patterns
    revisions     Specifying Revisions
    urls          URL Paths
   
   Mercurial output:
   
    color         Colorizing Outputs
    dates         Date Formats
    diffs         Diff Formats
    templating    Template Usage
   
   Mercurial configuration:
   
    config        Configuration Files
    environment   Environment Variables
    extensions    Using Additional Features
    flags         Command-line flags
    hgweb         Configuring hgweb
    merge-tools   Merge Tools
    pager         Pager Support
    rust          Rust in Mercurial
   
   Concepts:
   
    bundlespec    Bundle File Formats
    evolution     Safely rewriting history (EXPERIMENTAL)
    glossary      Glossary
    phases        Working with Phases
    subrepos      Subrepositories
   
   Miscellaneous:
   
    deprecated    Deprecated Features
    internals     Technical implementation topics
    scripting     Using Mercurial from scripts and automation
   
   (use 'hg help -v' to show built-in aliases and global options)
 
   $ hg -q help
   Repository creation:
   
    clone         make a copy of an existing repository
    init          create a new repository in the given directory
   
   Remote repository management:
   
    incoming      show new changesets found in source
    outgoing      show changesets not found in the destination
    paths         show aliases for remote repositories
    pull          pull changes from the specified source
    push          push changes to the specified destination
    serve         start stand-alone webserver
   
   Change creation:
   
    commit        commit the specified files or all outstanding changes
   
   Change manipulation:
   
    backout       reverse effect of earlier changeset
    graft         copy changes from other branches onto the current branch
    merge         merge another revision into working directory
   
   Change organization:
   
    bookmarks     create a new bookmark or list existing bookmarks
    branch        set or show the current branch name
    branches      list repository named branches
    phase         set or show the current phase name
    tag           add one or more tags for the current or given revision
    tags          list repository tags
   
   File content management:
   
    annotate      show changeset information by line for each file
    cat           output the current or given revision of files
    copy          mark files as copied for the next commit
    diff          diff repository (or selected files)
    grep          search for a pattern in specified files
   
   Change navigation:
   
    bisect        subdivision search of changesets
    heads         show branch heads
    identify      identify the working directory or specified revision
    log           show revision history of entire repository or files
   
   Working directory management:
   
    add           add the specified files on the next commit
    addremove     add all new files, delete all missing files
    files         list tracked files
    forget        forget the specified files on the next commit
    purge         removes files not tracked by Mercurial
    remove        remove the specified files on the next commit
    rename        rename files; equivalent of copy + remove
    resolve       redo merges or set/view the merge status of files
    revert        restore files to their checkout state
    root          print the root (top) of the current working directory
    shelve        save and set aside changes from the working directory
    status        show changed files in the working directory
    summary       summarize working directory state
    unshelve      restore a shelved change to the working directory
    update        update working directory (or switch revisions)
   
   Change import/export:
   
    archive       create an unversioned archive of a repository revision
    bundle        create a bundle file
    export        dump the header and diffs for one or more changesets
    import        import an ordered set of patches
    unbundle      apply one or more bundle files
   
   Repository maintenance:
   
    manifest      output the current or given revision of the project manifest
    recover       roll back an interrupted transaction
    verify        verify the integrity of the repository
   
   Help:
   
    config        show combined config settings from all hgrc files
    help          show help for a given topic or a help overview
    version       output version and copyright information
   
   additional help topics:
   
   Mercurial identifiers:
   
    filesets      Specifying File Sets
    hgignore      Syntax for Mercurial Ignore Files
    patterns      File Name Patterns
    revisions     Specifying Revisions
    urls          URL Paths
   
   Mercurial output:
   
    color         Colorizing Outputs
    dates         Date Formats
    diffs         Diff Formats
    templating    Template Usage
   
   Mercurial configuration:
   
    config        Configuration Files
    environment   Environment Variables
    extensions    Using Additional Features
    flags         Command-line flags
    hgweb         Configuring hgweb
    merge-tools   Merge Tools
    pager         Pager Support
    rust          Rust in Mercurial
   
   Concepts:
   
    bundlespec    Bundle File Formats
    evolution     Safely rewriting history (EXPERIMENTAL)
    glossary      Glossary
    phases        Working with Phases
    subrepos      Subrepositories
   
   Miscellaneous:
   
    deprecated    Deprecated Features
    internals     Technical implementation topics
    scripting     Using Mercurial from scripts and automation
 
 Test extension help:
   $ hg help extensions --config extensions.rebase= --config extensions.children=
   Using Additional Features
   """""""""""""""""""""""""
   
       Mercurial has the ability to add new features through the use of
       extensions. Extensions may add new commands, add options to existing
       commands, change the default behavior of commands, or implement hooks.
   
       To enable the "foo" extension, either shipped with Mercurial or in the
       Python search path, create an entry for it in your configuration file,
       like this:
   
         [extensions]
         foo =
   
       You may also specify the full path to an extension:
   
         [extensions]
         myfeature = ~/.hgext/myfeature.py
   
       See 'hg help config' for more information on configuration files.
   
       Extensions are not loaded by default for a variety of reasons: they can
       increase startup overhead; they may be meant for advanced usage only; they
       may provide potentially dangerous abilities (such as letting you destroy
       or modify history); they might not be ready for prime time; or they may
       alter some usual behaviors of stock Mercurial. It is thus up to the user
       to activate extensions as needed.
   
       To explicitly disable an extension enabled in a configuration file of
       broader scope, prepend its path with !:
   
         [extensions]
         # disabling extension bar residing in /path/to/extension/bar.py
         bar = !/path/to/extension/bar.py
         # ditto, but no path was supplied for extension baz
         baz = !
   
       enabled extensions:
   
        children      command to display child changesets (DEPRECATED)
        rebase        command to move sets of revisions to a different ancestor
   
       disabled extensions:
   
        acl           hooks for controlling repository access
        blackbox      log repository events to a blackbox for debugging
        bugzilla      hooks for integrating with the Bugzilla bug tracker
        censor        erase file content at a given revision
        churn         command to display statistics about repository history
        clonebundles  advertise pre-generated bundles to seed clones
        closehead     close arbitrary heads without checking them out first
        convert       import revisions from foreign VCS repositories into
                      Mercurial
        eol           automatically manage newlines in repository files
        extdiff       command to allow external programs to compare revisions
        factotum      http authentication with factotum
        fastexport    export repositories as git fast-import stream
        githelp       try mapping git commands to Mercurial commands
        gpg           commands to sign and verify changesets
        hgk           browse the repository in a graphical way
        highlight     syntax highlighting for hgweb (requires Pygments)
        histedit      interactive history editing
        keyword       expand keywords in tracked files
        largefiles    track large binary files
        mq            manage a stack of patches
        notify        hooks for sending email push notifications
        patchbomb     command to send changesets as (a series of) patch emails
        relink        recreates hardlinks between repository clones
        schemes       extend schemes with shortcuts to repository swarms
        share         share a common history between several working directories
        transplant    command to transplant changesets from another branch
        win32mbcs     allow the use of MBCS paths with problematic encodings
        zeroconf      discover and advertise repositories on the local network
 
 #endif
 
 Verify that deprecated extensions are included if --verbose:
 
   $ hg -v help extensions | grep children
        children      command to display child changesets (DEPRECATED)
 
 Verify that extension keywords appear in help templates
 
   $ hg help --config extensions.transplant= templating|grep transplant > /dev/null
 
 Test short command list with verbose option
 
   $ hg -v help shortlist
   Mercurial Distributed SCM
   
   basic commands:
   
    abort         abort an unfinished operation (EXPERIMENTAL)
    add           add the specified files on the next commit
    annotate, blame
                  show changeset information by line for each file
    clone         make a copy of an existing repository
    commit, ci    commit the specified files or all outstanding changes
    continue      resumes an interrupted operation (EXPERIMENTAL)
    diff          diff repository (or selected files)
    export        dump the header and diffs for one or more changesets
    forget        forget the specified files on the next commit
    init          create a new repository in the given directory
    log, history  show revision history of entire repository or files
    merge         merge another revision into working directory
    pull          pull changes from the specified source
    push          push changes to the specified destination
    remove, rm    remove the specified files on the next commit
    serve         start stand-alone webserver
    status, st    show changed files in the working directory
    summary, sum  summarize working directory state
    update, up, checkout, co
                  update working directory (or switch revisions)
   
   global options ([+] can be repeated):
   
    -R --repository REPO   repository root directory or name of overlay bundle
                           file
       --cwd DIR           change working directory
    -y --noninteractive    do not prompt, automatically pick the first choice for
                           all prompts
    -q --quiet             suppress output
    -v --verbose           enable additional output
       --color TYPE        when to colorize (boolean, always, auto, never, or
                           debug)
       --config CONFIG [+] set/override config option (use 'section.name=value')
       --debug             enable debugging output
       --debugger          start debugger
       --encoding ENCODE   set the charset encoding (default: ascii)
       --encodingmode MODE set the charset encoding mode (default: strict)
       --traceback         always print a traceback on exception
       --time              time how long the command takes
       --profile           print command execution profile
       --version           output version information and exit
    -h --help              display help and exit
       --hidden            consider hidden changesets
       --pager TYPE        when to paginate (boolean, always, auto, or never)
                           (default: auto)
   
   (use 'hg help' for the full list of commands)
 
   $ hg add -h
   hg add [OPTION]... [FILE]...
   
   add the specified files on the next commit
   
       Schedule files to be version controlled and added to the repository.
   
       The files will be added to the repository at the next commit. To undo an
       add before that, see 'hg forget'.
   
       If no names are given, add all files to the repository (except files
       matching ".hgignore").
   
       Returns 0 if all files are successfully added.
   
   options ([+] can be repeated):
   
    -I --include PATTERN [+] include names matching the given patterns
    -X --exclude PATTERN [+] exclude names matching the given patterns
    -S --subrepos            recurse into subrepositories
    -n --dry-run             do not perform actions, just print output
   
   (some details hidden, use --verbose to show complete help)
 
 Verbose help for add
 
   $ hg add -hv
   hg add [OPTION]... [FILE]...
   
   add the specified files on the next commit
   
       Schedule files to be version controlled and added to the repository.
   
       The files will be added to the repository at the next commit. To undo an
       add before that, see 'hg forget'.
   
       If no names are given, add all files to the repository (except files
       matching ".hgignore").
   
       Examples:
   
         - New (unknown) files are added automatically by 'hg add':
   
             $ ls
             foo.c
             $ hg status
             ? foo.c
             $ hg add
             adding foo.c
             $ hg status
             A foo.c
   
         - Specific files to be added can be specified:
   
             $ ls
             bar.c  foo.c
             $ hg status
             ? bar.c
             ? foo.c
             $ hg add bar.c
             $ hg status
             A bar.c
             ? foo.c
   
       Returns 0 if all files are successfully added.
   
   options ([+] can be repeated):
   
    -I --include PATTERN [+] include names matching the given patterns
    -X --exclude PATTERN [+] exclude names matching the given patterns
    -S --subrepos            recurse into subrepositories
    -n --dry-run             do not perform actions, just print output
   
   global options ([+] can be repeated):
   
    -R --repository REPO   repository root directory or name of overlay bundle
                           file
       --cwd DIR           change working directory
    -y --noninteractive    do not prompt, automatically pick the first choice for
                           all prompts
    -q --quiet             suppress output
    -v --verbose           enable additional output
       --color TYPE        when to colorize (boolean, always, auto, never, or
                           debug)
       --config CONFIG [+] set/override config option (use 'section.name=value')
       --debug             enable debugging output
       --debugger          start debugger
       --encoding ENCODE   set the charset encoding (default: ascii)
       --encodingmode MODE set the charset encoding mode (default: strict)
       --traceback         always print a traceback on exception
       --time              time how long the command takes
       --profile           print command execution profile
       --version           output version information and exit
    -h --help              display help and exit
       --hidden            consider hidden changesets
       --pager TYPE        when to paginate (boolean, always, auto, or never)
                           (default: auto)
 
 Test the textwidth config option
 
   $ hg root -h  --config ui.textwidth=50
   hg root
   
   print the root (top) of the current working
   directory
   
       Print the root directory of the current
       repository.
   
       Returns 0 on success.
   
   options:
   
    -T --template TEMPLATE display with template
   
   (some details hidden, use --verbose to show
   complete help)
 
 Test help option with version option
 
   $ hg add -h --version
   Mercurial Distributed SCM (version *) (glob)
   (see https://mercurial-scm.org for more information)
   
   Copyright (C) 2005-* Olivia Mackall and others (glob)
   This is free software; see the source for copying conditions. There is NO
   warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
 
   $ hg add --skjdfks
   hg add: option --skjdfks not recognized
   hg add [OPTION]... [FILE]...
   
   add the specified files on the next commit
   
   options ([+] can be repeated):
   
    -I --include PATTERN [+] include names matching the given patterns
    -X --exclude PATTERN [+] exclude names matching the given patterns
    -S --subrepos            recurse into subrepositories
    -n --dry-run             do not perform actions, just print output
   
   (use 'hg add -h' to show more help)
   [10]
 
 Test ambiguous command help
 
   $ hg help ad
   list of commands:
   
    add           add the specified files on the next commit
    addremove     add all new files, delete all missing files
   
   (use 'hg help -v ad' to show built-in aliases and global options)
 
 Test command without options
 
   $ hg help verify
   hg verify
   
   verify the integrity of the repository
   
       Verify the integrity of the current repository.
   
       This will perform an extensive check of the repository's integrity,
       validating the hashes and checksums of each entry in the changelog,
       manifest, and tracked files, as well as the integrity of their crosslinks
       and indices.
   
       Please see https://mercurial-scm.org/wiki/RepositoryCorruption for more
       information about recovery from corruption of the repository.
   
       Returns 0 on success, 1 if errors are encountered.
   
   options:
   
   (some details hidden, use --verbose to show complete help)
 
   $ hg help diff
   hg diff [OPTION]... ([-c REV] | [--from REV1] [--to REV2]) [FILE]...
   
   diff repository (or selected files)
   
       Show differences between revisions for the specified files.
   
       Differences between files are shown using the unified diff format.
   
       Note:
          'hg diff' may generate unexpected results for merges, as it will
          default to comparing against the working directory's first parent
          changeset if no revisions are specified.  To diff against the conflict
          regions, you can use '--config diff.merge=yes'.
   
       By default, the working directory files are compared to its first parent.
       To see the differences from another revision, use --from. To see the
       difference to another revision, use --to. For example, 'hg diff --from .^'
       will show the differences from the working copy's grandparent to the
       working copy, 'hg diff --to .' will show the diff from the working copy to
       its parent (i.e. the reverse of the default), and 'hg diff --from 1.0 --to
       1.2' will show the diff between those two revisions.
   
       Alternatively you can specify -c/--change with a revision to see the
       changes in that changeset relative to its first parent (i.e. 'hg diff -c
       42' is equivalent to 'hg diff --from 42^ --to 42')
   
       Without the -a/--text option, diff will avoid generating diffs of files it
       detects as binary. With -a, diff will generate a diff anyway, probably
       with undesirable results.
   
       Use the -g/--git option to generate diffs in the git extended diff format.
       For more information, read 'hg help diffs'.
   
       Returns 0 on success.
   
   options ([+] can be repeated):
   
       --from REV1           revision to diff from
       --to REV2             revision to diff to
    -c --change REV          change made by revision
    -a --text                treat all files as text
    -g --git                 use git extended diff format
       --binary              generate binary diffs in git mode (default)
       --nodates             omit dates from diff headers
       --noprefix            omit a/ and b/ prefixes from filenames
    -p --show-function       show which function each change is in
       --reverse             produce a diff that undoes the changes
    -w --ignore-all-space    ignore white space when comparing lines
    -b --ignore-space-change ignore changes in the amount of white space
    -B --ignore-blank-lines  ignore changes whose lines are all blank
    -Z --ignore-space-at-eol ignore changes in whitespace at EOL
    -U --unified NUM         number of lines of context to show
       --stat                output diffstat-style summary of changes
       --root DIR            produce diffs relative to subdirectory
    -I --include PATTERN [+] include names matching the given patterns
    -X --exclude PATTERN [+] exclude names matching the given patterns
    -S --subrepos            recurse into subrepositories
   
   (some details hidden, use --verbose to show complete help)
 
   $ hg help status
   hg status [OPTION]... [FILE]...
   
   aliases: st
   
   show changed files in the working directory
   
       Show status of files in the repository. If names are given, only files
       that match are shown. Files that are clean or ignored or the source of a
       copy/move operation, are not listed unless -c/--clean, -i/--ignored,
       -C/--copies or -A/--all are given. Unless options described with "show
       only ..." are given, the options -mardu are used.
   
       Option -q/--quiet hides untracked (unknown and ignored) files unless
       explicitly requested with -u/--unknown or -i/--ignored.
   
       Note:
          'hg status' may appear to disagree with diff if permissions have
          changed or a merge has occurred. The standard diff format does not
          report permission changes and diff only reports changes relative to one
          merge parent.
   
       If one revision is given, it is used as the base revision. If two
       revisions are given, the differences between them are shown. The --change
       option can also be used as a shortcut to list the changed files of a
       revision from its first parent.
   
       The codes used to show the status of files are:
   
         M = modified
         A = added
         R = removed
         C = clean
         ! = missing (deleted by non-hg command, but still tracked)
         ? = not tracked
         I = ignored
           = origin of the previous file (with --copies)
   
       Returns 0 on success.
   
   options ([+] can be repeated):
   
    -A --all                 show status of all files
    -m --modified            show only modified files
    -a --added               show only added files
    -r --removed             show only removed files
    -d --deleted             show only missing files
    -c --clean               show only files without changes
    -u --unknown             show only unknown (not tracked) files
    -i --ignored             show only ignored files
    -n --no-status           hide status prefix
    -C --copies              show source of copied files
    -0 --print0              end filenames with NUL, for use with xargs
       --rev REV [+]         show difference from revision
       --change REV          list the changed files of a revision
    -I --include PATTERN [+] include names matching the given patterns
    -X --exclude PATTERN [+] exclude names matching the given patterns
    -S --subrepos            recurse into subrepositories
    -T --template TEMPLATE   display with template
   
   (some details hidden, use --verbose to show complete help)
 
   $ hg -q help status
   hg status [OPTION]... [FILE]...
   
   show changed files in the working directory
 
   $ hg help foo
   abort: no such help topic: foo
   (try 'hg help --keyword foo')
   [10]
 
   $ hg skjdfks
   hg: unknown command 'skjdfks'
   (use 'hg help' for a list of commands)
   [10]
 
 Typoed command gives suggestion
   $ hg puls
   hg: unknown command 'puls'
   (did you mean one of pull, push?)
   [10]
 
 Not enabled extension gets suggested
 
   $ hg rebase
   hg: unknown command 'rebase'
   'rebase' is provided by the following extension:
   
       rebase        command to move sets of revisions to a different ancestor
   
   (use 'hg help extensions' for information on enabling extensions)
   [10]
 
 Disabled extension gets suggested
   $ hg --config extensions.rebase=! rebase
   hg: unknown command 'rebase'
   'rebase' is provided by the following extension:
   
       rebase        command to move sets of revisions to a different ancestor
   
   (use 'hg help extensions' for information on enabling extensions)
   [10]
 
 Checking that help adapts based on the config:
 
   $ hg help diff --config ui.tweakdefaults=true | egrep -e '^ *(-g|config)'
    -g --[no-]git            use git extended diff format (default: on from
                             config)
 
 Make sure that we don't run afoul of the help system thinking that
 this is a section and erroring out weirdly.
 
   $ hg .log
   hg: unknown command '.log'
   (did you mean log?)
   [10]
 
   $ hg log.
   hg: unknown command 'log.'
   (did you mean log?)
   [10]
   $ hg pu.lh
   hg: unknown command 'pu.lh'
   (did you mean one of pull, push?)
   [10]
 
   $ cat > helpext.py <<EOF
   > import os
   > from mercurial import commands, fancyopts, registrar
   > 
   > def func(arg):
   >     return '%sfoo' % arg
   > class customopt(fancyopts.customopt):
   >     def newstate(self, oldstate, newparam, abort):
   >         return '%sbar' % oldstate
   > cmdtable = {}
   > command = registrar.command(cmdtable)
   > 
   > @command(b'nohelp',
   >     [(b'', b'longdesc', 3, b'x'*67),
   >     (b'n', b'', None, b'normal desc'),
   >     (b'', b'newline', b'', b'line1\nline2'),
   >     (b'', b'default-off', False, b'enable X'),
   >     (b'', b'default-on', True, b'enable Y'),
   >     (b'', b'callableopt', func, b'adds foo'),
   >     (b'', b'customopt', customopt(''), b'adds bar'),
   >     (b'', b'customopt-withdefault', customopt('foo'), b'adds bar')],
   >     b'hg nohelp',
   >     norepo=True)
   > @command(b'debugoptADV', [(b'', b'aopt', None, b'option is (ADVANCED)')])
   > @command(b'debugoptDEP', [(b'', b'dopt', None, b'option is (DEPRECATED)')])
   > @command(b'debugoptEXP', [(b'', b'eopt', None, b'option is (EXPERIMENTAL)')])
   > def nohelp(ui, *args, **kwargs):
   >     pass
   > 
   > @command(b'hashelp', [], b'hg hashelp', norepo=True)
   > def hashelp(ui, *args, **kwargs):
   >     """Extension command's help"""
   > 
   > def uisetup(ui):
   >     ui.setconfig(b'alias', b'shellalias', b'!echo hi', b'helpext')
   >     ui.setconfig(b'alias', b'hgalias', b'summary', b'helpext')
   >     ui.setconfig(b'alias', b'hgalias:doc', b'My doc', b'helpext')
   >     ui.setconfig(b'alias', b'hgalias:category', b'navigation', b'helpext')
   >     ui.setconfig(b'alias', b'hgaliasnodoc', b'summary', b'helpext')
   > 
   > EOF
   $ echo '[extensions]' >> $HGRCPATH
   $ echo "helpext = `pwd`/helpext.py" >> $HGRCPATH
 
 Test for aliases
 
   $ hg help | grep hgalias
    hgalias       My doc
 
   $ hg help hgalias
   hg hgalias [--remote]
   
   alias for: hg summary
   
   My doc
   
   defined by: helpext
   
   options:
   
     --remote check for push and pull
   
   (some details hidden, use --verbose to show complete help)
   $ hg help hgaliasnodoc
   hg hgaliasnodoc [--remote]
   
   alias for: hg summary
   
   summarize working directory state
   
       This generates a brief summary of the working directory state, including
       parents, branch, commit status, phase and available updates.
   
       With the --remote option, this will check the default paths for incoming
       and outgoing changes. This can be time-consuming.
   
       Returns 0 on success.
   
   defined by: helpext
   
   options:
   
     --remote check for push and pull
   
   (some details hidden, use --verbose to show complete help)
 
   $ hg help shellalias
   hg shellalias
   
   shell alias for: echo hi
   
   (no help text available)
   
   defined by: helpext
   
   (some details hidden, use --verbose to show complete help)
 
 Test command with no help text
 
   $ hg help nohelp
   hg nohelp
   
   (no help text available)
   
   options:
   
       --longdesc VALUE
                                     xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
                                     xxxxxxxxxxxxxxxxxxxxxxx (default: 3)
    -n --                            normal desc
       --newline VALUE               line1 line2
       --default-off                 enable X
       --[no-]default-on             enable Y (default: on)
       --callableopt VALUE           adds foo
       --customopt VALUE             adds bar
       --customopt-withdefault VALUE adds bar (default: foo)
   
   (some details hidden, use --verbose to show complete help)
 
 Test that default list of commands includes extension commands that have help,
 but not those that don't, except in verbose mode, when a keyword is passed, or
 when help about the extension is requested.
 
 #if no-extraextensions
 
   $ hg help | grep hashelp
    hashelp       Extension command's help
   $ hg help | grep nohelp
   [1]
   $ hg help -v | grep nohelp
    nohelp        (no help text available)
 
   $ hg help -k nohelp
   Commands:
   
    nohelp hg nohelp
   
   Extension Commands:
   
    nohelp (no help text available)
 
   $ hg help helpext
   helpext extension - no help text available
   
   list of commands:
   
    hashelp       Extension command's help
    nohelp        (no help text available)
   
   (use 'hg help -v helpext' to show built-in aliases and global options)
 
 #endif
 
 Test list of internal help commands
 
   $ hg help debug
   debug commands (internal and unsupported):
   
    debug-delta-find
                  display the computation to get to a valid delta for storing REV
    debug-repair-issue6528
                  find affected revisions and repair them. See issue6528 for more
                  details.
    debug-revlog-index
                  dump index data for a revlog
    debug-revlog-stats
                  display statistics about revlogs in the store
+   debug::stable-tail-sort
+                 display the stable-tail sort of the ancestors of a given node
    debugancestor
                  find the ancestor revision of two revisions in a given index
    debugantivirusrunning
                  attempt to trigger an antivirus scanner to see if one is active
    debugapplystreamclonebundle
                  apply a stream clone bundle file
    debugbackupbundle
                  lists the changesets available in backup bundles
    debugbuilddag
                  builds a repo with a given DAG from scratch in the current
                  empty repo
    debugbundle   lists the contents of a bundle
    debugcapabilities
                  lists the capabilities of a remote peer
    debugchangedfiles
                  list the stored files changes for a revision
    debugcheckstate
                  validate the correctness of the current dirstate
    debugcolor    show available color, effects or style
    debugcommands
                  list all available commands and options
    debugcomplete
                  returns the completion list associated with the given command
    debugcreatestreamclonebundle
                  create a stream clone bundle file
    debugdag      format the changelog or an index DAG as a concise textual
                  description
    debugdata     dump the contents of a data file revision
    debugdate     parse and display a date
    debugdeltachain
                  dump information about delta chains in a revlog
    debugdirstate
                  show the contents of the current dirstate
    debugdirstateignorepatternshash
                  show the hash of ignore patterns stored in dirstate if v2,
    debugdiscovery
                  runs the changeset discovery protocol in isolation
    debugdownload
                  download a resource using Mercurial logic and config
    debugextensions
                  show information about active extensions
    debugfileset  parse and apply a fileset specification
    debugformat   display format information about the current repository
    debugfsinfo   show information detected about current filesystem
    debuggetbundle
                  retrieves a bundle from a repo
    debugignore   display the combined ignore pattern and information about
                  ignored files
    debugindexdot
                  dump an index DAG as a graphviz dot file
    debugindexstats
                  show stats related to the changelog index
    debuginstall  test Mercurial installation
    debugknown    test whether node ids are known to a repo
    debuglocks    show or modify state of locks
    debugmanifestfulltextcache
                  show, clear or amend the contents of the manifest fulltext
                  cache
    debugmergestate
                  print merge state
    debugnamecomplete
                  complete "names" - tags, open branch names, bookmark names
    debugnodemap  write and inspect on disk nodemap
    debugobsolete
                  create arbitrary obsolete marker
    debugoptADV   (no help text available)
    debugoptDEP   (no help text available)
    debugoptEXP   (no help text available)
    debugp1copies
                  dump copy information compared to p1
    debugp2copies
                  dump copy information compared to p2
    debugpathcomplete
                  complete part or all of a tracked path
    debugpathcopies
                  show copies between two revisions
    debugpeer     establish a connection to a peer repository
    debugpickmergetool
                  examine which merge tool is chosen for specified file
    debugpushkey  access the pushkey key/value protocol
    debugpvec     (no help text available)
    debugrebuilddirstate
                  rebuild the dirstate as it would look like for the given
                  revision
    debugrebuildfncache
                  rebuild the fncache file
    debugrename   dump rename information
    debugrequires
                  print the current repo requirements
    debugrevlog   show data and statistics about a revlog
    debugrevlogindex
                  dump the contents of a revlog index
    debugrevspec  parse and apply a revision specification
    debugserve    run a server with advanced settings
    debugsetparents
                  manually set the parents of the current working directory
                  (DANGEROUS)
    debugshell    run an interactive Python interpreter
    debugsidedata
                  dump the side data for a cl/manifest/file revision
    debugssl      test a secure connection to a server
    debugstrip    strip changesets and all their descendants from the repository
    debugsub      (no help text available)
    debugsuccessorssets
                  show set of successors for revision
    debugtagscache
                  display the contents of .hg/cache/hgtagsfnodes1
    debugtemplate
                  parse and apply a template
    debuguigetpass
                  show prompt to type password
    debuguiprompt
                  show plain prompt
    debugupdatecaches
                  warm all known caches in the repository
    debugupgraderepo
                  upgrade a repository to use different features
    debugwalk     show how files match on given patterns
    debugwhyunstable
                  explain instabilities of a changeset
    debugwireargs
                  (no help text available)
    debugwireproto
                  send wire protocol commands to a server
   
   (use 'hg help -v debug' to show built-in aliases and global options)
 
 internals topic renders index of available sub-topics
 
   $ hg help internals
   Technical implementation topics
   """""""""""""""""""""""""""""""
   
       To access a subtopic, use "hg help internals.{subtopic-name}"
   
        bid-merge     Bid Merge Algorithm
        bundle2       Bundle2
        bundles       Bundles
        cbor          CBOR
        censor        Censor
        changegroups  Changegroups
        config        Config Registrar
        dirstate-v2   dirstate-v2 file format
        extensions    Extension API
        mergestate    Mergestate
        requirements  Repository Requirements
        revlogs       Revision Logs
        wireprotocol  Wire Protocol
        wireprotocolrpc
                      Wire Protocol RPC
        wireprotocolv2
                      Wire Protocol Version 2
 
 sub-topics can be accessed
 
   $ hg help internals.changegroups
   Changegroups
   """"""""""""
   
       Changegroups are representations of repository revlog data, specifically
       the changelog data, root/flat manifest data, treemanifest data, and
       filelogs.
   
       There are 4 versions of changegroups: "1", "2", "3" and "4". From a high-
       level, versions "1" and "2" are almost exactly the same, with the only
       difference being an additional item in the *delta header*. Version "3"
       adds support for storage flags in the *delta header* and optionally
       exchanging treemanifests (enabled by setting an option on the
       "changegroup" part in the bundle2). Version "4" adds support for
       exchanging sidedata (additional revision metadata not part of the digest).
   
       Changegroups when not exchanging treemanifests consist of 3 logical
       segments:
   
         +---------------------------------+
         |           |          |          |
         | changeset | manifest | filelogs |
         |           |          |          |
         |           |          |          |
         +---------------------------------+
   
       When exchanging treemanifests, there are 4 logical segments:
   
         +-------------------------------------------------+
         |           |          |               |          |
         | changeset |   root   | treemanifests | filelogs |
         |           | manifest |               |          |
         |           |          |               |          |
         +-------------------------------------------------+
   
       The principle building block of each segment is a *chunk*. A *chunk* is a
       framed piece of data:
   
         +---------------------------------------+
         |           |                           |
         |  length   |           data            |
         | (4 bytes) |   (<length - 4> bytes)    |
         |           |                           |
         +---------------------------------------+
   
       All integers are big-endian signed integers. Each chunk starts with a
       32-bit integer indicating the length of the entire chunk (including the
       length field itself).
   
       There is a special case chunk that has a value of 0 for the length
       ("0x00000000"). We call this an *empty chunk*.
   
       Delta Groups
       ============
   
       A *delta group* expresses the content of a revlog as a series of deltas,
       or patches against previous revisions.
   
       Delta groups consist of 0 or more *chunks* followed by the *empty chunk*
       to signal the end of the delta group:
   
         +------------------------------------------------------------------------+
         |                |             |               |             |           |
         | chunk0 length  | chunk0 data | chunk1 length | chunk1 data |    0x0    |
         |   (4 bytes)    |  (various)  |   (4 bytes)   |  (various)  | (4 bytes) |
         |                |             |               |             |           |
         +------------------------------------------------------------------------+
   
       Each *chunk*'s data consists of the following:
   
         +---------------------------------------+
         |                        |              |
         |     delta header       |  delta data  |
         |  (various by version)  |  (various)   |
         |                        |              |
         +---------------------------------------+
   
       The *delta data* is a series of *delta*s that describe a diff from an
       existing entry (either that the recipient already has, or previously
       specified in the bundle/changegroup).
   
       The *delta header* is different between versions "1", "2", "3" and "4" of
       the changegroup format.
   
       Version 1 (headerlen=80):
   
         +------------------------------------------------------+
         |            |             |             |             |
         |    node    |   p1 node   |   p2 node   |  link node  |
         | (20 bytes) |  (20 bytes) |  (20 bytes) |  (20 bytes) |
         |            |             |             |             |
         +------------------------------------------------------+
   
       Version 2 (headerlen=100):
   
         +------------------------------------------------------------------+
         |            |             |             |            |            |
         |    node    |   p1 node   |   p2 node   | base node  | link node  |
         | (20 bytes) |  (20 bytes) |  (20 bytes) | (20 bytes) | (20 bytes) |
         |            |             |             |            |            |
         +------------------------------------------------------------------+
   
       Version 3 (headerlen=102):
   
         +------------------------------------------------------------------------------+
         |            |             |             |            |            |           |
         |    node    |   p1 node   |   p2 node   | base node  | link node  |   flags   |
         | (20 bytes) |  (20 bytes) |  (20 bytes) | (20 bytes) | (20 bytes) | (2 bytes) |
         |            |             |             |            |            |           |
         +------------------------------------------------------------------------------+
   
       Version 4 (headerlen=103):
   
         +------------------------------------------------------------------------------+----------+
         |            |             |             |            |            |           |          |
         |    node    |   p1 node   |   p2 node   | base node  | link node  |   flags   |  pflags  |
         | (20 bytes) |  (20 bytes) |  (20 bytes) | (20 bytes) | (20 bytes) | (2 bytes) | (1 byte) |
         |            |             |             |            |            |           |          |
         +------------------------------------------------------------------------------+----------+
   
       The *delta data* consists of "chunklen - 4 - headerlen" bytes, which
       contain a series of *delta*s, densely packed (no separators). These deltas
       describe a diff from an existing entry (either that the recipient already
       has, or previously specified in the bundle/changegroup). The format is
       described more fully in "hg help internals.bdiff", but briefly:
   
         +---------------------------------------------------------------+
         |              |            |            |                      |
         | start offset | end offset | new length |        content       |
         |  (4 bytes)   |  (4 bytes) |  (4 bytes) | (<new length> bytes) |
         |              |            |            |                      |
         +---------------------------------------------------------------+
   
       Please note that the length field in the delta data does *not* include
       itself.
   
       In version 1, the delta is always applied against the previous node from
       the changegroup or the first parent if this is the first entry in the
       changegroup.
   
       In version 2 and up, the delta base node is encoded in the entry in the
       changegroup. This allows the delta to be expressed against any parent,
       which can result in smaller deltas and more efficient encoding of data.
   
       The *flags* field holds bitwise flags affecting the processing of revision
       data. The following flags are defined:
   
       32768
          Censored revision. The revision's fulltext has been replaced by censor
          metadata. May only occur on file revisions.
   
       16384
          Ellipsis revision. Revision hash does not match data (likely due to
          rewritten parents).
   
       8192
          Externally stored. The revision fulltext contains "key:value" "\n"
          delimited metadata defining an object stored elsewhere. Used by the LFS
          extension.
   
       4096
          Contains copy information. This revision changes files in a way that
          could affect copy tracing. This does *not* affect changegroup handling,
          but is relevant for other parts of Mercurial.
   
       For historical reasons, the integer values are identical to revlog version
       1 per-revision storage flags and correspond to bits being set in this
       2-byte field. Bits were allocated starting from the most-significant bit,
       hence the reverse ordering and allocation of these flags.
   
       The *pflags* (protocol flags) field holds bitwise flags affecting the
       protocol itself. They are first in the header since they may affect the
       handling of the rest of the fields in a future version. They are defined
       as such:
   
       1 indicates whether to read a chunk of sidedata (of variable length) right
         after the revision flags.
   
       Changeset Segment
       =================
   
       The *changeset segment* consists of a single *delta group* holding
       changelog data. The *empty chunk* at the end of the *delta group* denotes
       the boundary to the *manifest segment*.
   
       Manifest Segment
       ================
   
       The *manifest segment* consists of a single *delta group* holding manifest
       data. If treemanifests are in use, it contains only the manifest for the
       root directory of the repository. Otherwise, it contains the entire
       manifest data. The *empty chunk* at the end of the *delta group* denotes
       the boundary to the next segment (either the *treemanifests segment* or
       the *filelogs segment*, depending on version and the request options).
   
       Treemanifests Segment
       ---------------------
   
       The *treemanifests segment* only exists in changegroup version "3" and
       "4", and only if the 'treemanifest' param is part of the bundle2
       changegroup part (it is not possible to use changegroup version 3 or 4
       outside of bundle2). Aside from the filenames in the *treemanifests
       segment* containing a trailing "/" character, it behaves identically to
       the *filelogs segment* (see below). The final sub-segment is followed by
       an *empty chunk* (logically, a sub-segment with filename size 0). This
       denotes the boundary to the *filelogs segment*.
   
       Filelogs Segment
       ================
   
       The *filelogs segment* consists of multiple sub-segments, each
       corresponding to an individual file whose data is being described:
   
         +--------------------------------------------------+
         |          |          |          |     |           |
         | filelog0 | filelog1 | filelog2 | ... |    0x0    |
         |          |          |          |     | (4 bytes) |
         |          |          |          |     |           |
         +--------------------------------------------------+
   
       The final filelog sub-segment is followed by an *empty chunk* (logically,
       a sub-segment with filename size 0). This denotes the end of the segment
       and of the overall changegroup.
   
       Each filelog sub-segment consists of the following:
   
         +------------------------------------------------------+
         |                 |                      |             |
         | filename length |       filename       | delta group |
         |    (4 bytes)    | (<length - 4> bytes) |  (various)  |
         |                 |                      |             |
         +------------------------------------------------------+
   
       That is, a *chunk* consisting of the filename (not terminated or padded)
       followed by N chunks constituting the *delta group* for this file. The
       *empty chunk* at the end of each *delta group* denotes the boundary to the
       next filelog sub-segment.
 
 non-existent subtopics print an error
 
   $ hg help internals.foo
   abort: no such help topic: internals.foo
   (try 'hg help --keyword foo')
   [10]
 
 test advanced, deprecated and experimental options are hidden in command help
   $ hg help debugoptADV
   hg debugoptADV
   
   (no help text available)
   
   options:
   
   (some details hidden, use --verbose to show complete help)
   $ hg help debugoptDEP
   hg debugoptDEP
   
   (no help text available)
   
   options:
   
   (some details hidden, use --verbose to show complete help)
 
   $ hg help debugoptEXP
   hg debugoptEXP
   
   (no help text available)
   
   options:
   
   (some details hidden, use --verbose to show complete help)
 
 test advanced, deprecated and experimental options are shown with -v
   $ hg help -v debugoptADV | grep aopt
     --aopt option is (ADVANCED)
   $ hg help -v debugoptDEP | grep dopt
     --dopt option is (DEPRECATED)
   $ hg help -v debugoptEXP | grep eopt
     --eopt option is (EXPERIMENTAL)
 
 #if gettext
 test deprecated option is hidden with translation with untranslated description
 (use many globy for not failing on changed transaction)
   $ LANGUAGE=sv hg help debugoptDEP
   hg debugoptDEP
   
   (*) (glob)
   
   options:
   
   (some details hidden, use --verbose to show complete help)
 #endif
 
 Test commands that collide with topics (issue4240)
 
   $ hg config -hq
   hg config [-u] [NAME]...
   
   show combined config settings from all hgrc files
   $ hg showconfig -hq
   hg config [-u] [NAME]...
   
   show combined config settings from all hgrc files
 
 Test a help topic
 
   $ hg help dates
   Date Formats
   """"""""""""
   
       Some commands allow the user to specify a date, e.g.:
   
       - backout, commit, import, tag: Specify the commit date.
       - log, revert, update: Select revision(s) by date.
   
       Many date formats are valid. Here are some examples:
   
       - "Wed Dec 6 13:18:29 2006" (local timezone assumed)
       - "Dec 6 13:18 -0600" (year assumed, time offset provided)
       - "Dec 6 13:18 UTC" (UTC and GMT are aliases for +0000)
       - "Dec 6" (midnight)
       - "13:18" (today assumed)
       - "3:39" (3:39AM assumed)
       - "3:39pm" (15:39)
       - "2006-12-06 13:18:29" (ISO 8601 format)
       - "2006-12-6 13:18"
       - "2006-12-6"
       - "12-6"
       - "12/6"
       - "12/6/6" (Dec 6 2006)
       - "today" (midnight)
       - "yesterday" (midnight)
       - "now" - right now
   
       Lastly, there is Mercurial's internal format:
   
       - "1165411109 0" (Wed Dec 6 13:18:29 2006 UTC)
   
       This is the internal representation format for dates. The first number is
       the number of seconds since the epoch (1970-01-01 00:00 UTC). The second
       is the offset of the local timezone, in seconds west of UTC (negative if
       the timezone is east of UTC).
   
       The log command also accepts date ranges:
   
       - "<DATE" - at or before a given date/time
       - ">DATE" - on or after a given date/time
       - "DATE to DATE" - a date range, inclusive
       - "-DAYS" - within a given number of days from today
 
 Test repeated config section name
 
   $ hg help config.host
       "http_proxy.host"
           Host name and (optional) port of the proxy server, for example
           "myproxy:8000".
   
       "smtp.host"
           Host name of mail server, e.g. "mail.example.com".
   
 
 Test section name with dot
 
   $ hg help config.ui.username
       "ui.username"
           The committer of a changeset created when running "commit". Typically
           a person's name and email address, e.g. "Fred Widget
           <[e-mail]>". Environment variables in the username are
           expanded.
   
           (default: "$EMAIL" or "username@hostname". If the username in hgrc is
           empty, e.g. if the system admin set "username =" in the system hgrc,
           it has to be specified manually or in a different hgrc file)
   
 
   $ hg help config.annotate.git
   abort: help section not found: config.annotate.git
   [10]
 
   $ hg help config.update.check
       "commands.update.check"
           Determines what level of checking 'hg update' will perform before
           moving to a destination revision. Valid values are "abort", "none",
           "linear", and "noconflict".
   
           - "abort" always fails if the working directory has uncommitted
             changes.
           - "none" performs no checking, and may result in a merge with
             uncommitted changes.
           - "linear" allows any update as long as it follows a straight line in
             the revision history, and may trigger a merge with uncommitted
             changes.
           - "noconflict" will allow any update which would not trigger a merge
             with uncommitted changes, if any are present.
   
           (default: "linear")
   
 
   $ hg help config.commands.update.check
       "commands.update.check"
           Determines what level of checking 'hg update' will perform before
           moving to a destination revision. Valid values are "abort", "none",
           "linear", and "noconflict".
   
           - "abort" always fails if the working directory has uncommitted
             changes.
           - "none" performs no checking, and may result in a merge with
             uncommitted changes.
           - "linear" allows any update as long as it follows a straight line in
             the revision history, and may trigger a merge with uncommitted
             changes.
           - "noconflict" will allow any update which would not trigger a merge
             with uncommitted changes, if any are present.
   
           (default: "linear")
   
 
   $ hg help config.ommands.update.check
   abort: help section not found: config.ommands.update.check
   [10]
 
 Unrelated trailing paragraphs shouldn't be included
 
   $ hg help config.extramsg | grep '^$'
   
 
 Test capitalized section name
 
   $ hg help scripting.HGPLAIN > /dev/null
 
 Help subsection:
 
   $ hg help config.charsets |grep "Email example:" > /dev/null
   [1]
 
 Show nested definitions
 ("profiling.type"[break]"ls"[break]"stat"[break])
 
   $ hg help config.type | egrep '^$'|wc -l
   \s*3 (re)
 
   $ hg help config.profiling.type.ls
           "profiling.type.ls"
             Use Python's built-in instrumenting profiler. This profiler works on
             all platforms, but each line number it reports is the first line of
             a function. This restriction makes it difficult to identify the
             expensive parts of a non-trivial function.
   
 
 Separate sections from subsections
 
   $ hg help config.format | egrep '^    ("|-)|^\s*$' | uniq
       "format"
       --------
   
       "usegeneraldelta"
   
       "dotencode"
   
       "usefncache"
   
       "use-dirstate-v2"
   
       "use-dirstate-v2.automatic-upgrade-of-mismatching-repositories"
   
       "use-dirstate-v2.automatic-upgrade-of-mismatching-repositories:quiet"
   
       "use-dirstate-tracked-hint"
   
       "use-dirstate-tracked-hint.automatic-upgrade-of-mismatching-repositories"
   
       "use-dirstate-tracked-hint.automatic-upgrade-of-mismatching-repositories:quiet"
   
       "use-persistent-nodemap"
   
       "use-share-safe"
   
       "use-share-safe.automatic-upgrade-of-mismatching-repositories"
   
       "use-share-safe.automatic-upgrade-of-mismatching-repositories:quiet"
   
       "usestore"
   
       "sparse-revlog"
   
       "revlog-compression"
   
       "bookmarks-in-store"
   
       "profiling"
       -----------
   
       "format"
   
       "progress"
       ----------
   
       "format"
   
 
 Last item in help config.*:
 
   $ hg help config.`hg help config|grep '^    "'| \
   >       tail -1|sed 's![ "]*!!g'`| \
   >   grep 'hg help -c config' > /dev/null
   [1]
 
 note to use help -c for general hg help config:
 
   $ hg help config |grep 'hg help -c config' > /dev/null
 
 Test templating help
 
   $ hg help templating | egrep '(desc|diffstat|firstline|nonempty)  '
       desc          String. The text of the changeset description.
       diffstat      String. Statistics of changes with the following format:
       firstline     Any text. Returns the first line of text.
       nonempty      Any text. Returns '(none)' if the string is empty.
 
 Test deprecated items
 
   $ hg help -v templating | grep currentbookmark
       currentbookmark
   $ hg help templating | (grep currentbookmark || true)
 
 Test help hooks
 
   $ cat > helphook1.py <<EOF
   > from mercurial import help
   > 
   > def rewrite(ui, topic, doc):
   >     return doc + b'\nhelphook1\n'
   > 
   > def extsetup(ui):
   >     help.addtopichook(b'revisions', rewrite)
   > EOF
   $ cat > helphook2.py <<EOF
   > from mercurial import help
   > 
   > def rewrite(ui, topic, doc):
   >     return doc + b'\nhelphook2\n'
   > 
   > def extsetup(ui):
   >     help.addtopichook(b'revisions', rewrite)
   > EOF
   $ echo '[extensions]' >> $HGRCPATH
   $ echo "helphook1 = `pwd`/helphook1.py" >> $HGRCPATH
   $ echo "helphook2 = `pwd`/helphook2.py" >> $HGRCPATH
   $ hg help revsets | grep helphook
       helphook1
       helphook2
 
 help -c should only show debug --debug
 
   $ hg help -c --debug|egrep debug|wc -l|egrep '^\s*0\s*$'
   [1]
 
 help -c should only show deprecated for -v
 
   $ hg help -c -v|egrep DEPRECATED|wc -l|egrep '^\s*0\s*$'
   [1]
 
 Test -s / --system
 
   $ hg help config.files -s windows |grep 'etc/mercurial' | \
   > wc -l | sed -e 's/ //g'
   0
   $ hg help config.files --system unix | grep 'USER' | \
   > wc -l | sed -e 's/ //g'
   0
 
 Test -e / -c / -k combinations
 
   $ hg help -c|egrep '^[A-Z].*:|^ debug'
   Commands:
   $ hg help -e|egrep '^[A-Z].*:|^ debug'
   Extensions:
   $ hg help -k|egrep '^[A-Z].*:|^ debug'
   Topics:
   Commands:
   Extensions:
   Extension Commands:
   $ hg help -c schemes
   abort: no such help topic: schemes
   (try 'hg help --keyword schemes')
   [10]
   $ hg help -e schemes |head -1
   schemes extension - extend schemes with shortcuts to repository swarms
   $ hg help -c -k dates |egrep '^(Topics|Extensions|Commands):'
   Commands:
   $ hg help -e -k a |egrep '^(Topics|Extensions|Commands):'
   Extensions:
   $ hg help -e -c -k date |egrep '^(Topics|Extensions|Commands):'
   Extensions:
   Commands:
   $ hg help -c commit > /dev/null
   $ hg help -e -c commit > /dev/null
   $ hg help -e commit
   abort: no such help topic: commit
   (try 'hg help --keyword commit')
   [10]
 
 Test keyword search help
 
   $ cat > prefixedname.py <<EOF
   > '''matched against word "clone"
   > '''
   > EOF
   $ echo '[extensions]' >> $HGRCPATH
   $ echo "dot.dot.prefixedname = `pwd`/prefixedname.py" >> $HGRCPATH
   $ hg help -k clone
   Topics:
   
    config     Configuration Files
    extensions Using Additional Features
    glossary   Glossary
    phases     Working with Phases
    subrepos   Subrepositories
    urls       URL Paths
   
   Commands:
   
    bookmarks create a new bookmark or list existing bookmarks
    clone     make a copy of an existing repository
    paths     show aliases for remote repositories
    pull      pull changes from the specified source
    update    update working directory (or switch revisions)
   
   Extensions:
   
    clonebundles advertise pre-generated bundles to seed clones
    narrow       create clones which fetch history data for subset of files
                 (EXPERIMENTAL)
    prefixedname matched against word "clone"
    relink       recreates hardlinks between repository clones
   
   Extension Commands:
   
    qclone clone main and patch repository at same time
 
 Test unfound topic
 
   $ hg help nonexistingtopicthatwillneverexisteverever
   abort: no such help topic: nonexistingtopicthatwillneverexisteverever
   (try 'hg help --keyword nonexistingtopicthatwillneverexisteverever')
   [10]
 
 Test unfound keyword
 
   $ hg help --keyword nonexistingwordthatwillneverexisteverever
   abort: no matches
   (try 'hg help' for a list of topics)
   [10]
 
 Test omit indicating for help
 
   $ cat > addverboseitems.py <<EOF
   > r'''extension to test omit indicating.
   > 
   > This paragraph is never omitted (for extension)
   > 
   > .. container:: verbose
   > 
   >   This paragraph is omitted,
   >   if :hg:\`help\` is invoked without \`\`-v\`\` (for extension)
   > 
   > This paragraph is never omitted, too (for extension)
   > '''
   > from mercurial import commands, help
   > testtopic = br"""This paragraph is never omitted (for topic).
   > 
   > .. container:: verbose
   > 
   >   This paragraph is omitted,
   >   if :hg:\`help\` is invoked without \`\`-v\`\` (for topic)
   > 
   > This paragraph is never omitted, too (for topic)
   > """
   > def extsetup(ui):
   >     help.helptable.append(([b"topic-containing-verbose"],
   >                            b"This is the topic to test omit indicating.",
   >                            lambda ui: testtopic))
   > EOF
   $ echo '[extensions]' >> $HGRCPATH
   $ echo "addverboseitems = `pwd`/addverboseitems.py" >> $HGRCPATH
   $ hg help addverboseitems
   addverboseitems extension - extension to test omit indicating.
   
   This paragraph is never omitted (for extension)
   
   This paragraph is never omitted, too (for extension)
   
   (some details hidden, use --verbose to show complete help)
   
   no commands defined
   $ hg help -v addverboseitems
   addverboseitems extension - extension to test omit indicating.
   
   This paragraph is never omitted (for extension)
   
   This paragraph is omitted, if 'hg help' is invoked without "-v" (for
   extension)
   
   This paragraph is never omitted, too (for extension)
   
   no commands defined
   $ hg help topic-containing-verbose
   This is the topic to test omit indicating.
   """"""""""""""""""""""""""""""""""""""""""
   
       This paragraph is never omitted (for topic).
   
       This paragraph is never omitted, too (for topic)
   
   (some details hidden, use --verbose to show complete help)
   $ hg help -v topic-containing-verbose
   This is the topic to test omit indicating.
   """"""""""""""""""""""""""""""""""""""""""
   
       This paragraph is never omitted (for topic).
   
       This paragraph is omitted, if 'hg help' is invoked without "-v" (for
       topic)
   
       This paragraph is never omitted, too (for topic)
 
 Test section lookup
 
   $ hg help revset.merge
       "merge()"
         Changeset is a merge changeset.
   
   $ hg help glossary.dag
       DAG
           The repository of changesets of a distributed version control system
           (DVCS) can be described as a directed acyclic graph (DAG), consisting
           of nodes and edges, where nodes correspond to changesets and edges
           imply a parent -> child relation. This graph can be visualized by
           graphical tools such as 'hg log --graph'. In Mercurial, the DAG is
           limited by the requirement for children to have at most two parents.
   
 
   $ hg help hgrc.paths
       "paths"
       -------
   
       Assigns symbolic names and behavior to repositories.
   
       Options are symbolic names defining the URL or directory that is the
       location of the repository. Example:
   
         [paths]
         my_server = https://example.com/my_repo
         local_path = /home/me/repo
   
       These symbolic names can be used from the command line. To pull from
       "my_server": 'hg pull my_server'. To push to "local_path": 'hg push
       local_path'. You can check 'hg help urls' for details about valid URLs.
   
       Options containing colons (":") denote sub-options that can influence
       behavior for that specific path. Example:
   
         [paths]
         my_server = https://example.com/my_path
         my_server:pushurl = ssh://example.com/my_path
   
       Paths using the 'path://otherpath' scheme will inherit the sub-options
       value from the path they point to.
   
       The following sub-options can be defined:
   
       "multi-urls"
          A boolean option. When enabled the value of the '[paths]' entry will be
          parsed as a list and the alias will resolve to multiple destination. If
          some of the list entry use the 'path://' syntax, the suboption will be
          inherited individually.
   
       "pushurl"
          The URL to use for push operations. If not defined, the location
          defined by the path's main entry is used.
   
       "pushrev"
          A revset defining which revisions to push by default.
   
          When 'hg push' is executed without a "-r" argument, the revset defined
          by this sub-option is evaluated to determine what to push.
   
          For example, a value of "." will push the working directory's revision
          by default.
   
          Revsets specifying bookmarks will not result in the bookmark being
          pushed.
   
       "bookmarks.mode"
         How bookmark will be dealt during the exchange. It support the following
         value
   
         - "default": the default behavior, local and remote bookmarks are
           "merged" on push/pull.
         - "mirror": when pulling, replace local bookmarks by remote bookmarks.
           This is useful to replicate a repository, or as an optimization.
         - "ignore": ignore bookmarks during exchange. (This currently only
           affect pulling)
   
       The following special named paths exist:
   
       "default"
          The URL or directory to use when no source or remote is specified.
   
          'hg clone' will automatically define this path to the location the
          repository was cloned from.
   
       "default-push"
          (deprecated) The URL or directory for the default 'hg push' location.
          "default:pushurl" should be used instead.
   
   $ hg help glossary.mcguffin
   abort: help section not found: glossary.mcguffin
   [10]
 
   $ hg help glossary.mc.guffin
   abort: help section not found: glossary.mc.guffin
   [10]
 
   $ hg help template.files
       files         List of strings. All files modified, added, or removed by
                     this changeset.
       files(pattern)
                     All files of the current changeset matching the pattern. See
                     'hg help patterns'.
 
 Test section lookup by translated message
 
 str.lower() instead of encoding.lower(str) on translated message might
 make message meaningless, because some encoding uses 0x41(A) - 0x5a(Z)
 as the second or later byte of multi-byte character.
 
 For example, "\x8bL\x98^" (translation of "record" in ja_JP.cp932)
 contains 0x4c (L). str.lower() replaces 0x4c(L) by 0x6c(l) and this
 replacement makes message meaningless.
 
 This tests that section lookup by translated string isn't broken by
 such str.lower().
 
   $ "$PYTHON" <<EOF
   > def escape(s):
   >     return b''.join(br'\\u%x' % ord(uc) for uc in s.decode('cp932'))
   > # translation of "record" in ja_JP.cp932
   > upper = b"\x8bL\x98^"
   > # str.lower()-ed section name should be treated as different one
   > lower = b"\x8bl\x98^"
   > with open('ambiguous.py', 'wb') as fp:
   >     fp.write(b"""# ambiguous section names in ja_JP.cp932
   > u'''summary of extension
   > 
   > %s
   > ----
   > 
   > Upper name should show only this message
   > 
   > %s
   > ----
   > 
   > Lower name should show only this message
   > 
   > subsequent section
   > ------------------
   > 
   > This should be hidden at 'hg help ambiguous' with section name.
   > '''
   > """ % (escape(upper), escape(lower)))
   > EOF
 
   $ cat >> $HGRCPATH <<EOF
   > [extensions]
   > ambiguous = ./ambiguous.py
   > EOF
 
   $ "$PYTHON" <<EOF | sh
   > from mercurial.utils import procutil
   > upper = b"\x8bL\x98^"
   > procutil.stdout.write(b"hg --encoding cp932 help -e ambiguous.%s\n" % upper)
   > EOF
   \x8bL\x98^ (esc)
   ----
   
   Upper name should show only this message
   
 
   $ "$PYTHON" <<EOF | sh
   > from mercurial.utils import procutil
   > lower = b"\x8bl\x98^"
   > procutil.stdout.write(b"hg --encoding cp932 help -e ambiguous.%s\n" % lower)
   > EOF
   \x8bl\x98^ (esc)
   ----
   
   Lower name should show only this message
   
 
   $ cat >> $HGRCPATH <<EOF
   > [extensions]
   > ambiguous = !
   > EOF
 
 Show help content of disabled extensions
 
   $ cat >> $HGRCPATH <<EOF
   > [extensions]
   > ambiguous = !./ambiguous.py
   > EOF
   $ hg help -e ambiguous
   ambiguous extension - (no help text available)
   
   (use 'hg help extensions' for information on enabling extensions)
 
 Test dynamic list of merge tools only shows up once
   $ hg help merge-tools
   Merge Tools
   """""""""""
   
       To merge files Mercurial uses merge tools.
   
       A merge tool combines two different versions of a file into a merged file.
       Merge tools are given the two files and the greatest common ancestor of
       the two file versions, so they can determine the changes made on both
       branches.
   
       Merge tools are used both for 'hg resolve', 'hg merge', 'hg update', 'hg
       backout' and in several extensions.
   
       Usually, the merge tool tries to automatically reconcile the files by
       combining all non-overlapping changes that occurred separately in the two
       different evolutions of the same initial base file. Furthermore, some
       interactive merge programs make it easier to manually resolve conflicting
       merges, either in a graphical way, or by inserting some conflict markers.
       Mercurial does not include any interactive merge programs but relies on
       external tools for that.
   
       Available merge tools
       =====================
   
       External merge tools and their properties are configured in the merge-
       tools configuration section - see hgrc(5) - but they can often just be
       named by their executable.
   
       A merge tool is generally usable if its executable can be found on the
       system and if it can handle the merge. The executable is found if it is an
       absolute or relative executable path or the name of an application in the
       executable search path. The tool is assumed to be able to handle the merge
       if it can handle symlinks if the file is a symlink, if it can handle
       binary files if the file is binary, and if a GUI is available if the tool
       requires a GUI.
   
       There are some internal merge tools which can be used. The internal merge
       tools are:
   
       ":dump"
         Creates three versions of the files to merge, containing the contents of
         local, other and base. These files can then be used to perform a merge
         manually. If the file to be merged is named "a.txt", these files will
         accordingly be named "a.txt.local", "a.txt.other" and "a.txt.base" and
         they will be placed in the same directory as "a.txt".
   
         This implies premerge. Therefore, files aren't dumped, if premerge runs
         successfully. Use :forcedump to forcibly write files out.
   
         (actual capabilities: binary, symlink)
   
       ":fail"
         Rather than attempting to merge files that were modified on both
         branches, it marks them as unresolved. The resolve command must be used
         to resolve these conflicts.
   
         (actual capabilities: binary, symlink)
   
       ":forcedump"
         Creates three versions of the files as same as :dump, but omits
         premerge.
   
         (actual capabilities: binary, symlink)
   
       ":local"
         Uses the local 'p1()' version of files as the merged version.
   
         (actual capabilities: binary, symlink)
   
       ":merge"
         Uses the internal non-interactive simple merge algorithm for merging
         files. It will fail if there are any conflicts and leave markers in the
         partially merged file. Markers will have two sections, one for each side
         of merge.
   
       ":merge-local"
         Like :merge, but resolve all conflicts non-interactively in favor of the
         local 'p1()' changes.
   
       ":merge-other"
         Like :merge, but resolve all conflicts non-interactively in favor of the
         other 'p2()' changes.
   
       ":merge3"
         Uses the internal non-interactive simple merge algorithm for merging
         files. It will fail if there are any conflicts and leave markers in the
         partially merged file. Marker will have three sections, one from each
         side of the merge and one for the base content.
   
       ":mergediff"
         Uses the internal non-interactive simple merge algorithm for merging
         files. It will fail if there are any conflicts and leave markers in the
         partially merged file. The marker will have two sections, one with the
         content from one side of the merge, and one with a diff from the base
         content to the content on the other side. (experimental)
   
       ":other"
         Uses the other 'p2()' version of files as the merged version.
   
         (actual capabilities: binary, symlink)
   
       ":prompt"
         Asks the user which of the local 'p1()' or the other 'p2()' version to
         keep as the merged version.
   
         (actual capabilities: binary, symlink)
   
       ":tagmerge"
         Uses the internal tag merge algorithm (experimental).
   
       ":union"
         Uses the internal non-interactive simple merge algorithm for merging
         files. It will use both local and other sides for conflict regions by
         adding local on top of other. No markers are inserted.
   
       ":union-other-first"
         Like :union, but add other on top of local.
   
       Internal tools are always available and do not require a GUI but will by
       default not handle symlinks or binary files. See next section for detail
       about "actual capabilities" described above.
   
       Choosing a merge tool
       =====================
   
       Mercurial uses these rules when deciding which merge tool to use:
   
       1. If a tool has been specified with the --tool option to merge or
          resolve, it is used.  If it is the name of a tool in the merge-tools
          configuration, its configuration is used. Otherwise the specified tool
          must be executable by the shell.
       2. If the "HGMERGE" environment variable is present, its value is used and
          must be executable by the shell.
       3. If the filename of the file to be merged matches any of the patterns in
          the merge-patterns configuration section, the first usable merge tool
          corresponding to a matching pattern is used.
       4. If ui.merge is set it will be considered next. If the value is not the
          name of a configured tool, the specified value is used and must be
          executable by the shell. Otherwise the named tool is used if it is
          usable.
       5. If any usable merge tools are present in the merge-tools configuration
          section, the one with the highest priority is used.
       6. If a program named "hgmerge" can be found on the system, it is used -
          but it will by default not be used for symlinks and binary files.
       7. If the file to be merged is not binary and is not a symlink, then
          internal ":merge" is used.
       8. Otherwise, ":prompt" is used.
   
       For historical reason, Mercurial treats merge tools as below while
       examining rules above.
   
       step specified via  binary symlink
       ----------------------------------
       1.   --tool         o/o    o/o
       2.   HGMERGE        o/o    o/o
       3.   merge-patterns o/o(*) x/?(*)
       4.   ui.merge       x/?(*) x/?(*)
   
       Each capability column indicates Mercurial behavior for internal/external
       merge tools at examining each rule.
   
       - "o": "assume that a tool has capability"
       - "x": "assume that a tool does not have capability"
       - "?": "check actual capability of a tool"
   
       If "merge.strict-capability-check" configuration is true, Mercurial checks
       capabilities of merge tools strictly in (*) cases above (= each capability
       column becomes "?/?"). It is false by default for backward compatibility.
   
       Note:
          After selecting a merge program, Mercurial will by default attempt to
          merge the files using a simple merge algorithm first. Only if it
          doesn't succeed because of conflicting changes will Mercurial actually
          execute the merge program. Whether to use the simple merge algorithm
          first can be controlled by the premerge setting of the merge tool.
          Premerge is enabled by default unless the file is binary or a symlink.
   
       See the merge-tools and ui sections of hgrc(5) for details on the
       configuration of merge tools.
 
 Compression engines listed in `hg help bundlespec`
 
   $ hg help bundlespec | grep gzip
           "v1" bundles can only use the "gzip", "bzip2", and "none" compression
         An algorithm that produces smaller bundles than "gzip".
         This engine will likely produce smaller bundles than "gzip" but will be
       "gzip"
         better compression than "gzip". It also frequently yields better (?)
 
 Test usage of section marks in help documents
 
   $ cd "$TESTDIR"/../doc
   $ "$PYTHON" check-seclevel.py
   $ cd $TESTTMP
 
 #if serve
 
 Test the help pages in hgweb.
 
 Dish up an empty repo; serve it cold.
 
   $ hg init "$TESTTMP/test"
   $ hg serve -R "$TESTTMP/test" -n test -p $HGPORT -d --pid-file=hg.pid
   $ cat hg.pid >> $DAEMON_PIDS
 
   $ get-with-headers.py $LOCALIP:$HGPORT "help"
   200 Script output follows
   
   <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.1//EN" "http://www.w3.org/TR/xhtml11/DTD/xhtml11.dtd">
   <html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en-US">
   <head>
   <link rel="icon" href="/static/hgicon.png" type="image/png" />
   <meta name="robots" content="index, nofollow" />
   <link rel="stylesheet" href="/static/style-paper.css" type="text/css" />
   <script type="text/javascript" src="/static/mercurial.js"></script>
   
   <title>Help: Index</title>
   </head>
   <body>
   
   <div class="container">
   <div class="menu">
   <div class="logo">
   <a href="https://mercurial-scm.org/">
   <img src="/static/hglogo.png" alt="mercurial" /></a>
   </div>
   <ul>
   <li><a href="/shortlog">log</a></li>
   <li><a href="/graph">graph</a></li>
   <li><a href="/tags">tags</a></li>
   <li><a href="/bookmarks">bookmarks</a></li>
   <li><a href="/branches">branches</a></li>
   </ul>
   <ul>
   <li class="active">help</li>
   </ul>
   </div>
   
   <div class="main">
   <h2 class="breadcrumb"><a href="/">Mercurial</a> </h2>
   
   <form class="search" action="/log">
   
   <p><input name="rev" id="search1" type="text" size="30" value="" /></p>
   <div id="hint">Find changesets by keywords (author, files, the commit message), revision
   number or hash, or <a href="/help/revsets">revset expression</a>.</div>
   </form>
   <table class="bigtable">
   <tr><td colspan="2"><h2><a name="topics" href="#topics">Topics</a></h2></td></tr>
   
   <tr><td>
   <a href="/help/bundlespec">
   bundlespec
   </a>
   </td><td>
   Bundle File Formats
   </td></tr>
   <tr><td>
   <a href="/help/color">
   color
   </a>
   </td><td>
   Colorizing Outputs
   </td></tr>
   <tr><td>
   <a href="/help/config">
   config
   </a>
   </td><td>
   Configuration Files
   </td></tr>
   <tr><td>
   <a href="/help/dates">
   dates
   </a>
   </td><td>
   Date Formats
   </td></tr>
   <tr><td>
   <a href="/help/deprecated">
   deprecated
   </a>
   </td><td>
   Deprecated Features
   </td></tr>
   <tr><td>
   <a href="/help/diffs">
   diffs
   </a>
   </td><td>
   Diff Formats
   </td></tr>
   <tr><td>
   <a href="/help/environment">
   environment
   </a>
   </td><td>
   Environment Variables
   </td></tr>
   <tr><td>
   <a href="/help/evolution">
   evolution
   </a>
   </td><td>
   Safely rewriting history (EXPERIMENTAL)
   </td></tr>
   <tr><td>
   <a href="/help/extensions">
   extensions
   </a>
   </td><td>
   Using Additional Features
   </td></tr>
   <tr><td>
   <a href="/help/filesets">
   filesets
   </a>
   </td><td>
   Specifying File Sets
   </td></tr>
   <tr><td>
   <a href="/help/flags">
   flags
   </a>
   </td><td>
   Command-line flags
   </td></tr>
   <tr><td>
   <a href="/help/glossary">
   glossary
   </a>
   </td><td>
   Glossary
   </td></tr>
   <tr><td>
   <a href="/help/hgignore">
   hgignore
   </a>
   </td><td>
   Syntax for Mercurial Ignore Files
   </td></tr>
   <tr><td>
   <a href="/help/hgweb">
   hgweb
   </a>
   </td><td>
   Configuring hgweb
   </td></tr>
   <tr><td>
   <a href="/help/internals">
   internals
   </a>
   </td><td>
   Technical implementation topics
   </td></tr>
   <tr><td>
   <a href="/help/merge-tools">
   merge-tools
   </a>
   </td><td>
   Merge Tools
   </td></tr>
   <tr><td>
   <a href="/help/pager">
   pager
   </a>
   </td><td>
   Pager Support
   </td></tr>
   <tr><td>
   <a href="/help/patterns">
   patterns
   </a>
   </td><td>
   File Name Patterns
   </td></tr>
   <tr><td>
   <a href="/help/phases">
   phases
   </a>
   </td><td>
   Working with Phases
   </td></tr>
   <tr><td>
   <a href="/help/revisions">
   revisions
   </a>
   </td><td>
   Specifying Revisions
   </td></tr>
   <tr><td>
   <a href="/help/rust">
   rust
   </a>
   </td><td>
   Rust in Mercurial
   </td></tr>
   <tr><td>
   <a href="/help/scripting">
   scripting
   </a>
   </td><td>
   Using Mercurial from scripts and automation
   </td></tr>
   <tr><td>
   <a href="/help/subrepos">
   subrepos
   </a>
   </td><td>
   Subrepositories
   </td></tr>
   <tr><td>
   <a href="/help/templating">
   templating
   </a>
   </td><td>
   Template Usage
   </td></tr>
   <tr><td>
   <a href="/help/urls">
   urls
   </a>
   </td><td>
   URL Paths
   </td></tr>
   <tr><td>
   <a href="/help/topic-containing-verbose">
   topic-containing-verbose
   </a>
   </td><td>
   This is the topic to test omit indicating.
   </td></tr>
   
   
   <tr><td colspan="2"><h2><a name="main" href="#main">Main Commands</a></h2></td></tr>
   
   <tr><td>
   <a href="/help/abort">
   abort
   </a>
   </td><td>
   abort an unfinished operation (EXPERIMENTAL)
   </td></tr>
   <tr><td>
   <a href="/help/add">
   add
   </a>
   </td><td>
   add the specified files on the next commit
   </td></tr>
   <tr><td>
   <a href="/help/annotate">
   annotate
   </a>
   </td><td>
   show changeset information by line for each file
   </td></tr>
   <tr><td>
   <a href="/help/clone">
   clone
   </a>
   </td><td>
   make a copy of an existing repository
   </td></tr>
   <tr><td>
   <a href="/help/commit">
   commit
   </a>
   </td><td>
   commit the specified files or all outstanding changes
   </td></tr>
   <tr><td>
   <a href="/help/continue">
   continue
   </a>
   </td><td>
   resumes an interrupted operation (EXPERIMENTAL)
   </td></tr>
   <tr><td>
   <a href="/help/diff">
   diff
   </a>
   </td><td>
   diff repository (or selected files)
   </td></tr>
   <tr><td>
   <a href="/help/export">
   export
   </a>
   </td><td>
   dump the header and diffs for one or more changesets
   </td></tr>
   <tr><td>
   <a href="/help/forget">
   forget
   </a>
   </td><td>
   forget the specified files on the next commit
   </td></tr>
   <tr><td>
   <a href="/help/init">
   init
   </a>
   </td><td>
   create a new repository in the given directory
   </td></tr>
   <tr><td>
   <a href="/help/log">
   log
   </a>
   </td><td>
   show revision history of entire repository or files
   </td></tr>
   <tr><td>
   <a href="/help/merge">
   merge
   </a>
   </td><td>
   merge another revision into working directory
   </td></tr>
   <tr><td>
   <a href="/help/pull">
   pull
   </a>
   </td><td>
   pull changes from the specified source
   </td></tr>
   <tr><td>
   <a href="/help/push">
   push
   </a>
   </td><td>
   push changes to the specified destination
   </td></tr>
   <tr><td>
   <a href="/help/remove">
   remove
   </a>
   </td><td>
   remove the specified files on the next commit
   </td></tr>
   <tr><td>
   <a href="/help/serve">
   serve
   </a>
   </td><td>
   start stand-alone webserver
   </td></tr>
   <tr><td>
   <a href="/help/status">
   status
   </a>
   </td><td>
   show changed files in the working directory
   </td></tr>
   <tr><td>
   <a href="/help/summary">
   summary
   </a>
   </td><td>
   summarize working directory state
   </td></tr>
   <tr><td>
   <a href="/help/update">
   update
   </a>
   </td><td>
   update working directory (or switch revisions)
   </td></tr>
   
   
   
   <tr><td colspan="2"><h2><a name="other" href="#other">Other Commands</a></h2></td></tr>
   
   <tr><td>
   <a href="/help/addremove">
   addremove
   </a>
   </td><td>
   add all new files, delete all missing files
   </td></tr>
   <tr><td>
   <a href="/help/archive">
   archive
   </a>
   </td><td>
   create an unversioned archive of a repository revision
   </td></tr>
   <tr><td>
   <a href="/help/backout">
   backout
   </a>
   </td><td>
   reverse effect of earlier changeset
   </td></tr>
   <tr><td>
   <a href="/help/bisect">
   bisect
   </a>
   </td><td>
   subdivision search of changesets
   </td></tr>
   <tr><td>
   <a href="/help/bookmarks">
   bookmarks
   </a>
   </td><td>
   create a new bookmark or list existing bookmarks
   </td></tr>
   <tr><td>
   <a href="/help/branch">
   branch
   </a>
   </td><td>
   set or show the current branch name
   </td></tr>
   <tr><td>
   <a href="/help/branches">
   branches
   </a>
   </td><td>
   list repository named branches
   </td></tr>
   <tr><td>
   <a href="/help/bundle">
   bundle
   </a>
   </td><td>
   create a bundle file
   </td></tr>
   <tr><td>
   <a href="/help/cat">
   cat
   </a>
   </td><td>
   output the current or given revision of files
   </td></tr>
   <tr><td>
   <a href="/help/config">
   config
   </a>
   </td><td>
   show combined config settings from all hgrc files
   </td></tr>
   <tr><td>
   <a href="/help/copy">
   copy
   </a>
   </td><td>
   mark files as copied for the next commit
   </td></tr>
   <tr><td>
   <a href="/help/files">
   files
   </a>
   </td><td>
   list tracked files
   </td></tr>
   <tr><td>
   <a href="/help/graft">
   graft
   </a>
   </td><td>
   copy changes from other branches onto the current branch
   </td></tr>
   <tr><td>
   <a href="/help/grep">
   grep
   </a>
   </td><td>
   search for a pattern in specified files
   </td></tr>
   <tr><td>
   <a href="/help/hashelp">
   hashelp
   </a>
   </td><td>
   Extension command's help
   </td></tr>
   <tr><td>
   <a href="/help/heads">
   heads
   </a>
   </td><td>
   show branch heads
   </td></tr>
   <tr><td>
   <a href="/help/help">
   help
   </a>
   </td><td>
   show help for a given topic or a help overview
   </td></tr>
   <tr><td>
   <a href="/help/hgalias">
   hgalias
   </a>
   </td><td>
   My doc
   </td></tr>
   <tr><td>
   <a href="/help/hgaliasnodoc">
   hgaliasnodoc
   </a>
   </td><td>
   summarize working directory state
   </td></tr>
   <tr><td>
   <a href="/help/identify">
   identify
   </a>
   </td><td>
   identify the working directory or specified revision
   </td></tr>
   <tr><td>
   <a href="/help/import">
   import
   </a>
   </td><td>
   import an ordered set of patches
   </td></tr>
   <tr><td>
   <a href="/help/incoming">
   incoming
   </a>
   </td><td>
   show new changesets found in source
   </td></tr>
   <tr><td>
   <a href="/help/manifest">
   manifest
   </a>
   </td><td>
   output the current or given revision of the project manifest
   </td></tr>
   <tr><td>
   <a href="/help/nohelp">
   nohelp
   </a>
   </td><td>
   (no help text available)
   </td></tr>
   <tr><td>
   <a href="/help/outgoing">
   outgoing
   </a>
   </td><td>
   show changesets not found in the destination
   </td></tr>
   <tr><td>
   <a href="/help/paths">
   paths
   </a>
   </td><td>
   show aliases for remote repositories
   </td></tr>
   <tr><td>
   <a href="/help/phase">
   phase
   </a>
   </td><td>
   set or show the current phase name
   </td></tr>
   <tr><td>
   <a href="/help/purge">
   purge
   </a>
   </td><td>
   removes files not tracked by Mercurial
   </td></tr>
   <tr><td>
   <a href="/help/recover">
   recover
   </a>
   </td><td>
   roll back an interrupted transaction
   </td></tr>
   <tr><td>
   <a href="/help/rename">
   rename
   </a>
   </td><td>
   rename files; equivalent of copy + remove
   </td></tr>
   <tr><td>
   <a href="/help/resolve">
   resolve
   </a>
   </td><td>
   redo merges or set/view the merge status of files
   </td></tr>
   <tr><td>
   <a href="/help/revert">
   revert
   </a>
   </td><td>
   restore files to their checkout state
   </td></tr>
   <tr><td>
   <a href="/help/root">
   root
   </a>
   </td><td>
   print the root (top) of the current working directory
   </td></tr>
   <tr><td>
   <a href="/help/shellalias">
   shellalias
   </a>
   </td><td>
   (no help text available)
   </td></tr>
   <tr><td>
   <a href="/help/shelve">
   shelve
   </a>
   </td><td>
   save and set aside changes from the working directory
   </td></tr>
   <tr><td>
   <a href="/help/tag">
   tag
   </a>
   </td><td>
   add one or more tags for the current or given revision
   </td></tr>
   <tr><td>
   <a href="/help/tags">
   tags
   </a>
   </td><td>
   list repository tags
   </td></tr>
   <tr><td>
   <a href="/help/unbundle">
   unbundle
   </a>
   </td><td>
   apply one or more bundle files
   </td></tr>
   <tr><td>
   <a href="/help/unshelve">
   unshelve
   </a>
   </td><td>
   restore a shelved change to the working directory
   </td></tr>
   <tr><td>
   <a href="/help/verify">
   verify
   </a>
   </td><td>
   verify the integrity of the repository
   </td></tr>
   <tr><td>
   <a href="/help/version">
   version
   </a>
   </td><td>
   output version and copyright information
   </td></tr>
   
   
   </table>
   </div>
   </div>
   
   
   
   </body>
   </html>
   
 
   $ get-with-headers.py $LOCALIP:$HGPORT "help/add"
   200 Script output follows
   
   <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.1//EN" "http://www.w3.org/TR/xhtml11/DTD/xhtml11.dtd">
   <html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en-US">
   <head>
   <link rel="icon" href="/static/hgicon.png" type="image/png" />
   <meta name="robots" content="index, nofollow" />
   <link rel="stylesheet" href="/static/style-paper.css" type="text/css" />
   <script type="text/javascript" src="/static/mercurial.js"></script>
   
   <title>Help: add</title>
   </head>
   <body>
   
   <div class="container">
   <div class="menu">
   <div class="logo">
   <a href="https://mercurial-scm.org/">
   <img src="/static/hglogo.png" alt="mercurial" /></a>
   </div>
   <ul>
   <li><a href="/shortlog">log</a></li>
   <li><a href="/graph">graph</a></li>
   <li><a href="/tags">tags</a></li>
   <li><a href="/bookmarks">bookmarks</a></li>
   <li><a href="/branches">branches</a></li>
   </ul>
   <ul>
    <li class="active"><a href="/help">help</a></li>
   </ul>
   </div>
   
   <div class="main">
   <h2 class="breadcrumb"><a href="/">Mercurial</a> </h2>
   <h3>Help: add</h3>
   
   <form class="search" action="/log">
   
   <p><input name="rev" id="search1" type="text" size="30" value="" /></p>
   <div id="hint">Find changesets by keywords (author, files, the commit message), revision
   number or hash, or <a href="/help/revsets">revset expression</a>.</div>
   </form>
   <div id="doc">
   <p>
   hg add [OPTION]... [FILE]...
   </p>
   <p>
   add the specified files on the next commit
   </p>
   <p>
   Schedule files to be version controlled and added to the
   repository.
   </p>
   <p>
   The files will be added to the repository at the next commit. To
   undo an add before that, see 'hg forget'.
   </p>
   <p>
   If no names are given, add all files to the repository (except
   files matching &quot;.hgignore&quot;).
   </p>
   <p>
   Examples:
   </p>
   <ul>
    <li> New (unknown) files are added   automatically by 'hg add':
   <pre>
   \$ ls (re)
   foo.c
   \$ hg status (re)
   ? foo.c
   \$ hg add (re)
   adding foo.c
   \$ hg status (re)
   A foo.c
   </pre>
    <li> Specific files to be added can be specified:
   <pre>
   \$ ls (re)
   bar.c  foo.c
   \$ hg status (re)
   ? bar.c
   ? foo.c
   \$ hg add bar.c (re)
   \$ hg status (re)
   A bar.c
   ? foo.c
   </pre>
   </ul>
   <p>
   Returns 0 if all files are successfully added.
   </p>
   <p>
   options ([+] can be repeated):
   </p>
   <table>
   <tr><td>-I</td>
   <td>--include PATTERN [+]</td>
   <td>include names matching the given patterns</td></tr>
   <tr><td>-X</td>
   <td>--exclude PATTERN [+]</td>
   <td>exclude names matching the given patterns</td></tr>
   <tr><td>-S</td>
   <td>--subrepos</td>
   <td>recurse into subrepositories</td></tr>
   <tr><td>-n</td>
   <td>--dry-run</td>
   <td>do not perform actions, just print output</td></tr>
   </table>
   <p>
   global options ([+] can be repeated):
   </p>
   <table>
   <tr><td>-R</td>
   <td>--repository REPO</td>
   <td>repository root directory or name of overlay bundle file</td></tr>
   <tr><td></td>
   <td>--cwd DIR</td>
   <td>change working directory</td></tr>
   <tr><td>-y</td>
   <td>--noninteractive</td>
   <td>do not prompt, automatically pick the first choice for all prompts</td></tr>
   <tr><td>-q</td>
   <td>--quiet</td>
   <td>suppress output</td></tr>
   <tr><td>-v</td>
   <td>--verbose</td>
   <td>enable additional output</td></tr>
   <tr><td></td>
   <td>--color TYPE</td>
   <td>when to colorize (boolean, always, auto, never, or debug)</td></tr>
   <tr><td></td>
   <td>--config CONFIG [+]</td>
   <td>set/override config option (use 'section.name=value')</td></tr>
   <tr><td></td>
   <td>--debug</td>
   <td>enable debugging output</td></tr>
   <tr><td></td>
   <td>--debugger</td>
   <td>start debugger</td></tr>
   <tr><td></td>
   <td>--encoding ENCODE</td>
   <td>set the charset encoding (default: ascii)</td></tr>
   <tr><td></td>
   <td>--encodingmode MODE</td>
   <td>set the charset encoding mode (default: strict)</td></tr>
   <tr><td></td>
   <td>--traceback</td>
   <td>always print a traceback on exception</td></tr>
   <tr><td></td>
   <td>--time</td>
   <td>time how long the command takes</td></tr>
   <tr><td></td>
   <td>--profile</td>
   <td>print command execution profile</td></tr>
   <tr><td></td>
   <td>--version</td>
   <td>output version information and exit</td></tr>
   <tr><td>-h</td>
   <td>--help</td>
   <td>display help and exit</td></tr>
   <tr><td></td>
   <td>--hidden</td>
   <td>consider hidden changesets</td></tr>
   <tr><td></td>
   <td>--pager TYPE</td>
   <td>when to paginate (boolean, always, auto, or never) (default: auto)</td></tr>
   </table>
   
   </div>
   </div>
   </div>
   
   
   
   </body>
   </html>
   
 
   $ get-with-headers.py $LOCALIP:$HGPORT "help/remove"
   200 Script output follows
   
   <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.1//EN" "http://www.w3.org/TR/xhtml11/DTD/xhtml11.dtd">
   <html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en-US">
   <head>
   <link rel="icon" href="/static/hgicon.png" type="image/png" />
   <meta name="robots" content="index, nofollow" />
   <link rel="stylesheet" href="/static/style-paper.css" type="text/css" />
   <script type="text/javascript" src="/static/mercurial.js"></script>
   
   <title>Help: remove</title>
   </head>
   <body>
   
   <div class="container">
   <div class="menu">
   <div class="logo">
   <a href="https://mercurial-scm.org/">
   <img src="/static/hglogo.png" alt="mercurial" /></a>
   </div>
   <ul>
   <li><a href="/shortlog">log</a></li>
   <li><a href="/graph">graph</a></li>
   <li><a href="/tags">tags</a></li>
   <li><a href="/bookmarks">bookmarks</a></li>
   <li><a href="/branches">branches</a></li>
   </ul>
   <ul>
    <li class="active"><a href="/help">help</a></li>
   </ul>
   </div>
   
   <div class="main">
   <h2 class="breadcrumb"><a href="/">Mercurial</a> </h2>
   <h3>Help: remove</h3>
   
   <form class="search" action="/log">
   
   <p><input name="rev" id="search1" type="text" size="30" value="" /></p>
   <div id="hint">Find changesets by keywords (author, files, the commit message), revision
   number or hash, or <a href="/help/revsets">revset expression</a>.</div>
   </form>
   <div id="doc">
   <p>
   hg remove [OPTION]... FILE...
   </p>
   <p>
   aliases: rm
   </p>
   <p>
   remove the specified files on the next commit
   </p>
   <p>
   Schedule the indicated files for removal from the current branch.
   </p>
   <p>
   This command schedules the files to be removed at the next commit.
   To undo a remove before that, see 'hg revert'. To undo added
   files, see 'hg forget'.
   </p>
   <p>
   -A/--after can be used to remove only files that have already
   been deleted, -f/--force can be used to force deletion, and -Af
   can be used to remove files from the next revision without
   deleting them from the working directory.
   </p>
   <p>
   The following table details the behavior of remove for different
   file states (columns) and option combinations (rows). The file
   states are Added [A], Clean [C], Modified [M] and Missing [!]
   (as reported by 'hg status'). The actions are Warn, Remove
   (from branch) and Delete (from disk):
   </p>
   <table>
   <tr><td>opt/state</td>
   <td>A</td>
   <td>C</td>
   <td>M</td>
   <td>!</td></tr>
   <tr><td>none</td>
   <td>W</td>
   <td>RD</td>
   <td>W</td>
   <td>R</td></tr>
   <tr><td>-f</td>
   <td>R</td>
   <td>RD</td>
   <td>RD</td>
   <td>R</td></tr>
   <tr><td>-A</td>
   <td>W</td>
   <td>W</td>
   <td>W</td>
   <td>R</td></tr>
   <tr><td>-Af</td>
   <td>R</td>
   <td>R</td>
   <td>R</td>
   <td>R</td></tr>
   </table>
   <p>
   <b>Note:</b> 
   </p>
   <p>
   'hg remove' never deletes files in Added [A] state from the
   working directory, not even if &quot;--force&quot; is specified.
   </p>
   <p>
   Returns 0 on success, 1 if any warnings encountered.
   </p>
   <p>
   options ([+] can be repeated):
   </p>
   <table>
   <tr><td>-A</td>
   <td>--after</td>
   <td>record delete for missing files</td></tr>
   <tr><td>-f</td>
   <td>--force</td>
   <td>forget added files, delete modified files</td></tr>
   <tr><td>-S</td>
   <td>--subrepos</td>
   <td>recurse into subrepositories</td></tr>
   <tr><td>-I</td>
   <td>--include PATTERN [+]</td>
   <td>include names matching the given patterns</td></tr>
   <tr><td>-X</td>
   <td>--exclude PATTERN [+]</td>
   <td>exclude names matching the given patterns</td></tr>
   <tr><td>-n</td>
   <td>--dry-run</td>
   <td>do not perform actions, just print output</td></tr>
   </table>
   <p>
   global options ([+] can be repeated):
   </p>
   <table>
   <tr><td>-R</td>
   <td>--repository REPO</td>
   <td>repository root directory or name of overlay bundle file</td></tr>
   <tr><td></td>
   <td>--cwd DIR</td>
   <td>change working directory</td></tr>
   <tr><td>-y</td>
   <td>--noninteractive</td>
   <td>do not prompt, automatically pick the first choice for all prompts</td></tr>
   <tr><td>-q</td>
   <td>--quiet</td>
   <td>suppress output</td></tr>
   <tr><td>-v</td>
   <td>--verbose</td>
   <td>enable additional output</td></tr>
   <tr><td></td>
   <td>--color TYPE</td>
   <td>when to colorize (boolean, always, auto, never, or debug)</td></tr>
   <tr><td></td>
   <td>--config CONFIG [+]</td>
   <td>set/override config option (use 'section.name=value')</td></tr>
   <tr><td></td>
   <td>--debug</td>
   <td>enable debugging output</td></tr>
   <tr><td></td>
   <td>--debugger</td>
   <td>start debugger</td></tr>
   <tr><td></td>
   <td>--encoding ENCODE</td>
   <td>set the charset encoding (default: ascii)</td></tr>
   <tr><td></td>
   <td>--encodingmode MODE</td>
   <td>set the charset encoding mode (default: strict)</td></tr>
   <tr><td></td>
   <td>--traceback</td>
   <td>always print a traceback on exception</td></tr>
   <tr><td></td>
   <td>--time</td>
   <td>time how long the command takes</td></tr>
   <tr><td></td>
   <td>--profile</td>
   <td>print command execution profile</td></tr>
   <tr><td></td>
   <td>--version</td>
   <td>output version information and exit</td></tr>
   <tr><td>-h</td>
   <td>--help</td>
   <td>display help and exit</td></tr>
   <tr><td></td>
   <td>--hidden</td>
   <td>consider hidden changesets</td></tr>
   <tr><td></td>
   <td>--pager TYPE</td>
   <td>when to paginate (boolean, always, auto, or never) (default: auto)</td></tr>
   </table>
   
   </div>
   </div>
   </div>
   
   
   
   </body>
   </html>
   
 
   $ get-with-headers.py $LOCALIP:$HGPORT "help/dates"
   200 Script output follows
   
   <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.1//EN" "http://www.w3.org/TR/xhtml11/DTD/xhtml11.dtd">
   <html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en-US">
   <head>
   <link rel="icon" href="/static/hgicon.png" type="image/png" />
   <meta name="robots" content="index, nofollow" />
   <link rel="stylesheet" href="/static/style-paper.css" type="text/css" />
   <script type="text/javascript" src="/static/mercurial.js"></script>
   
   <title>Help: dates</title>
   </head>
   <body>
   
   <div class="container">
   <div class="menu">
   <div class="logo">
   <a href="https://mercurial-scm.org/">
   <img src="/static/hglogo.png" alt="mercurial" /></a>
   </div>
   <ul>
   <li><a href="/shortlog">log</a></li>
   <li><a href="/graph">graph</a></li>
   <li><a href="/tags">tags</a></li>
   <li><a href="/bookmarks">bookmarks</a></li>
   <li><a href="/branches">branches</a></li>
   </ul>
   <ul>
    <li class="active"><a href="/help">help</a></li>
   </ul>
   </div>
   
   <div class="main">
   <h2 class="breadcrumb"><a href="/">Mercurial</a> </h2>
   <h3>Help: dates</h3>
   
   <form class="search" action="/log">
   
   <p><input name="rev" id="search1" type="text" size="30" value="" /></p>
   <div id="hint">Find changesets by keywords (author, files, the commit message), revision
   number or hash, or <a href="/help/revsets">revset expression</a>.</div>
   </form>
   <div id="doc">
   <h1>Date Formats</h1>
   <p>
   Some commands allow the user to specify a date, e.g.:
   </p>
   <ul>
    <li> backout, commit, import, tag: Specify the commit date.
    <li> log, revert, update: Select revision(s) by date.
   </ul>
   <p>
   Many date formats are valid. Here are some examples:
   </p>
   <ul>
    <li> &quot;Wed Dec 6 13:18:29 2006&quot; (local timezone assumed)
    <li> &quot;Dec 6 13:18 -0600&quot; (year assumed, time offset provided)
    <li> &quot;Dec 6 13:18 UTC&quot; (UTC and GMT are aliases for +0000)
    <li> &quot;Dec 6&quot; (midnight)
    <li> &quot;13:18&quot; (today assumed)
    <li> &quot;3:39&quot; (3:39AM assumed)
    <li> &quot;3:39pm&quot; (15:39)
    <li> &quot;2006-12-06 13:18:29&quot; (ISO 8601 format)
    <li> &quot;2006-12-6 13:18&quot;
    <li> &quot;2006-12-6&quot;
    <li> &quot;12-6&quot;
    <li> &quot;12/6&quot;
    <li> &quot;12/6/6&quot; (Dec 6 2006)
    <li> &quot;today&quot; (midnight)
    <li> &quot;yesterday&quot; (midnight)
    <li> &quot;now&quot; - right now
   </ul>
   <p>
   Lastly, there is Mercurial's internal format:
   </p>
   <ul>
    <li> &quot;1165411109 0&quot; (Wed Dec 6 13:18:29 2006 UTC)
   </ul>
   <p>
   This is the internal representation format for dates. The first number
   is the number of seconds since the epoch (1970-01-01 00:00 UTC). The
   second is the offset of the local timezone, in seconds west of UTC
   (negative if the timezone is east of UTC).
   </p>
   <p>
   The log command also accepts date ranges:
   </p>
   <ul>
    <li> &quot;&lt;DATE&quot; - at or before a given date/time
    <li> &quot;&gt;DATE&quot; - on or after a given date/time
    <li> &quot;DATE to DATE&quot; - a date range, inclusive
    <li> &quot;-DAYS&quot; - within a given number of days from today
   </ul>
   
   </div>
   </div>
   </div>
   
   
   
   </body>
   </html>
   
 
   $ get-with-headers.py $LOCALIP:$HGPORT "help/pager"
   200 Script output follows
   
   <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.1//EN" "http://www.w3.org/TR/xhtml11/DTD/xhtml11.dtd">
   <html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en-US">
   <head>
   <link rel="icon" href="/static/hgicon.png" type="image/png" />
   <meta name="robots" content="index, nofollow" />
   <link rel="stylesheet" href="/static/style-paper.css" type="text/css" />
   <script type="text/javascript" src="/static/mercurial.js"></script>
   
   <title>Help: pager</title>
   </head>
   <body>
   
   <div class="container">
   <div class="menu">
   <div class="logo">
   <a href="https://mercurial-scm.org/">
   <img src="/static/hglogo.png" alt="mercurial" /></a>
   </div>
   <ul>
   <li><a href="/shortlog">log</a></li>
   <li><a href="/graph">graph</a></li>
   <li><a href="/tags">tags</a></li>
   <li><a href="/bookmarks">bookmarks</a></li>
   <li><a href="/branches">branches</a></li>
   </ul>
   <ul>
    <li class="active"><a href="/help">help</a></li>
   </ul>
   </div>
   
   <div class="main">
   <h2 class="breadcrumb"><a href="/">Mercurial</a> </h2>
   <h3>Help: pager</h3>
   
   <form class="search" action="/log">
   
   <p><input name="rev" id="search1" type="text" size="30" value="" /></p>
   <div id="hint">Find changesets by keywords (author, files, the commit message), revision
   number or hash, or <a href="/help/revsets">revset expression</a>.</div>
   </form>
   <div id="doc">
   <h1>Pager Support</h1>
   <p>
   Some Mercurial commands can produce a lot of output, and Mercurial will
   attempt to use a pager to make those commands more pleasant.
   </p>
   <p>
   To set the pager that should be used, set the application variable:
   </p>
   <pre>
   [pager]
   pager = less -FRX
   </pre>
   <p>
   If no pager is set in the user or repository configuration, Mercurial uses the
   environment variable $PAGER. If $PAGER is not set, pager.pager from the default
   or system configuration is used. If none of these are set, a default pager will
   be used, typically 'less' on Unix and 'more' on Windows.
   </p>
   <p>
   You can disable the pager for certain commands by adding them to the
   pager.ignore list:
   </p>
   <pre>
   [pager]
   ignore = version, help, update
   </pre>
   <p>
   To ignore global commands like 'hg version' or 'hg help', you have
   to specify them in your user configuration file.
   </p>
   <p>
   To control whether the pager is used at all for an individual command,
   you can use --pager=&lt;value&gt;:
   </p>
   <ul>
    <li> use as needed: 'auto'.
    <li> require the pager: 'yes' or 'on'.
    <li> suppress the pager: 'no' or 'off' (any unrecognized value   will also work).
   </ul>
   <p>
   To globally turn off all attempts to use a pager, set:
   </p>
   <pre>
   [ui]
   paginate = never
   </pre>
   <p>
   which will prevent the pager from running.
   </p>
   
   </div>
   </div>
   </div>
   
   
   
   </body>
   </html>
   
 
 Sub-topic indexes rendered properly
 
   $ get-with-headers.py $LOCALIP:$HGPORT "help/internals"
   200 Script output follows
   
   <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.1//EN" "http://www.w3.org/TR/xhtml11/DTD/xhtml11.dtd">
   <html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en-US">
   <head>
   <link rel="icon" href="/static/hgicon.png" type="image/png" />
   <meta name="robots" content="index, nofollow" />
   <link rel="stylesheet" href="/static/style-paper.css" type="text/css" />
   <script type="text/javascript" src="/static/mercurial.js"></script>
   
   <title>Help: internals</title>
   </head>
   <body>
   
   <div class="container">
   <div class="menu">
   <div class="logo">
   <a href="https://mercurial-scm.org/">
   <img src="/static/hglogo.png" alt="mercurial" /></a>
   </div>
   <ul>
   <li><a href="/shortlog">log</a></li>
   <li><a href="/graph">graph</a></li>
   <li><a href="/tags">tags</a></li>
   <li><a href="/bookmarks">bookmarks</a></li>
   <li><a href="/branches">branches</a></li>
   </ul>
   <ul>
   <li><a href="/help">help</a></li>
   </ul>
   </div>
   
   <div class="main">
   <h2 class="breadcrumb"><a href="/">Mercurial</a> </h2>
   
   <form class="search" action="/log">
   
   <p><input name="rev" id="search1" type="text" size="30" value="" /></p>
   <div id="hint">Find changesets by keywords (author, files, the commit message), revision
   number or hash, or <a href="/help/revsets">revset expression</a>.</div>
   </form>
   <table class="bigtable">
   <tr><td colspan="2"><h2><a name="topics" href="#topics">Topics</a></h2></td></tr>
   
   <tr><td>
   <a href="/help/internals.bid-merge">
   bid-merge
   </a>
   </td><td>
   Bid Merge Algorithm
   </td></tr>
   <tr><td>
   <a href="/help/internals.bundle2">
   bundle2
   </a>
   </td><td>
   Bundle2
   </td></tr>
   <tr><td>
   <a href="/help/internals.bundles">
   bundles
   </a>
   </td><td>
   Bundles
   </td></tr>
   <tr><td>
   <a href="/help/internals.cbor">
   cbor
   </a>
   </td><td>
   CBOR
   </td></tr>
   <tr><td>
   <a href="/help/internals.censor">
   censor
   </a>
   </td><td>
   Censor
   </td></tr>
   <tr><td>
   <a href="/help/internals.changegroups">
   changegroups
   </a>
   </td><td>
   Changegroups
   </td></tr>
   <tr><td>
   <a href="/help/internals.config">
   config
   </a>
   </td><td>
   Config Registrar
   </td></tr>
   <tr><td>
   <a href="/help/internals.dirstate-v2">
   dirstate-v2
   </a>
   </td><td>
   dirstate-v2 file format
   </td></tr>
   <tr><td>
   <a href="/help/internals.extensions">
   extensions
   </a>
   </td><td>
   Extension API
   </td></tr>
   <tr><td>
   <a href="/help/internals.mergestate">
   mergestate
   </a>
   </td><td>
   Mergestate
   </td></tr>
   <tr><td>
   <a href="/help/internals.requirements">
   requirements
   </a>
   </td><td>
   Repository Requirements
   </td></tr>
   <tr><td>
   <a href="/help/internals.revlogs">
   revlogs
   </a>
   </td><td>
   Revision Logs
   </td></tr>
   <tr><td>
   <a href="/help/internals.wireprotocol">
   wireprotocol
   </a>
   </td><td>
   Wire Protocol
   </td></tr>
   <tr><td>
   <a href="/help/internals.wireprotocolrpc">
   wireprotocolrpc
   </a>
   </td><td>
   Wire Protocol RPC
   </td></tr>
   <tr><td>
   <a href="/help/internals.wireprotocolv2">
   wireprotocolv2
   </a>
   </td><td>
   Wire Protocol Version 2
   </td></tr>
   
   
   
   
   
   </table>
   </div>
   </div>
   
   
   
   </body>
   </html>
   
 
 Sub-topic topics rendered properly
 
   $ get-with-headers.py $LOCALIP:$HGPORT "help/internals.changegroups"
   200 Script output follows
   
   <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.1//EN" "http://www.w3.org/TR/xhtml11/DTD/xhtml11.dtd">
   <html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en-US">
   <head>
   <link rel="icon" href="/static/hgicon.png" type="image/png" />
   <meta name="robots" content="index, nofollow" />
   <link rel="stylesheet" href="/static/style-paper.css" type="text/css" />
   <script type="text/javascript" src="/static/mercurial.js"></script>
   
   <title>Help: internals.changegroups</title>
   </head>
   <body>
   
   <div class="container">
   <div class="menu">
   <div class="logo">
   <a href="https://mercurial-scm.org/">
   <img src="/static/hglogo.png" alt="mercurial" /></a>
   </div>
   <ul>
   <li><a href="/shortlog">log</a></li>
   <li><a href="/graph">graph</a></li>
   <li><a href="/tags">tags</a></li>
   <li><a href="/bookmarks">bookmarks</a></li>
   <li><a href="/branches">branches</a></li>
   </ul>
   <ul>
    <li class="active"><a href="/help">help</a></li>
   </ul>
   </div>
   
   <div class="main">
   <h2 class="breadcrumb"><a href="/">Mercurial</a> </h2>
   <h3>Help: internals.changegroups</h3>
   
   <form class="search" action="/log">
   
   <p><input name="rev" id="search1" type="text" size="30" value="" /></p>
   <div id="hint">Find changesets by keywords (author, files, the commit message), revision
   number or hash, or <a href="/help/revsets">revset expression</a>.</div>
   </form>
   <div id="doc">
   <h1>Changegroups</h1>
   <p>
   Changegroups are representations of repository revlog data, specifically
   the changelog data, root/flat manifest data, treemanifest data, and
   filelogs.
   </p>
   <p>
   There are 4 versions of changegroups: &quot;1&quot;, &quot;2&quot;, &quot;3&quot; and &quot;4&quot;. From a
   high-level, versions &quot;1&quot; and &quot;2&quot; are almost exactly the same, with the
   only difference being an additional item in the *delta header*. Version
   &quot;3&quot; adds support for storage flags in the *delta header* and optionally
   exchanging treemanifests (enabled by setting an option on the
   &quot;changegroup&quot; part in the bundle2). Version &quot;4&quot; adds support for exchanging
   sidedata (additional revision metadata not part of the digest).
   </p>
   <p>
   Changegroups when not exchanging treemanifests consist of 3 logical
   segments:
   </p>
   <pre>
   +---------------------------------+
   |           |          |          |
   | changeset | manifest | filelogs |
   |           |          |          |
   |           |          |          |
   +---------------------------------+
   </pre>
   <p>
   When exchanging treemanifests, there are 4 logical segments:
   </p>
   <pre>
   +-------------------------------------------------+
   |           |          |               |          |
   | changeset |   root   | treemanifests | filelogs |
   |           | manifest |               |          |
   |           |          |               |          |
   +-------------------------------------------------+
   </pre>
   <p>
   The principle building block of each segment is a *chunk*. A *chunk*
   is a framed piece of data:
   </p>
   <pre>
   +---------------------------------------+
   |           |                           |
   |  length   |           data            |
   | (4 bytes) |   (&lt;length - 4&gt; bytes)    |
   |           |                           |
   +---------------------------------------+
   </pre>
   <p>
   All integers are big-endian signed integers. Each chunk starts with a 32-bit
   integer indicating the length of the entire chunk (including the length field
   itself).
   </p>
   <p>
   There is a special case chunk that has a value of 0 for the length
   (&quot;0x00000000&quot;). We call this an *empty chunk*.
   </p>
   <h2>Delta Groups</h2>
   <p>
   A *delta group* expresses the content of a revlog as a series of deltas,
   or patches against previous revisions.
   </p>
   <p>
   Delta groups consist of 0 or more *chunks* followed by the *empty chunk*
   to signal the end of the delta group:
   </p>
   <pre>
   +------------------------------------------------------------------------+
   |                |             |               |             |           |
   | chunk0 length  | chunk0 data | chunk1 length | chunk1 data |    0x0    |
   |   (4 bytes)    |  (various)  |   (4 bytes)   |  (various)  | (4 bytes) |
   |                |             |               |             |           |
   +------------------------------------------------------------------------+
   </pre>
   <p>
   Each *chunk*'s data consists of the following:
   </p>
   <pre>
   +---------------------------------------+
   |                        |              |
   |     delta header       |  delta data  |
   |  (various by version)  |  (various)   |
   |                        |              |
   +---------------------------------------+
   </pre>
   <p>
   The *delta data* is a series of *delta*s that describe a diff from an existing
   entry (either that the recipient already has, or previously specified in the
   bundle/changegroup).
   </p>
   <p>
   The *delta header* is different between versions &quot;1&quot;, &quot;2&quot;, &quot;3&quot; and &quot;4&quot;
   of the changegroup format.
   </p>
   <p>
   Version 1 (headerlen=80):
   </p>
   <pre>
   +------------------------------------------------------+
   |            |             |             |             |
   |    node    |   p1 node   |   p2 node   |  link node  |
   | (20 bytes) |  (20 bytes) |  (20 bytes) |  (20 bytes) |
   |            |             |             |             |
   +------------------------------------------------------+
   </pre>
   <p>
   Version 2 (headerlen=100):
   </p>
   <pre>
   +------------------------------------------------------------------+
   |            |             |             |            |            |
   |    node    |   p1 node   |   p2 node   | base node  | link node  |
   | (20 bytes) |  (20 bytes) |  (20 bytes) | (20 bytes) | (20 bytes) |
   |            |             |             |            |            |
   +------------------------------------------------------------------+
   </pre>
   <p>
   Version 3 (headerlen=102):
   </p>
   <pre>
   +------------------------------------------------------------------------------+
   |            |             |             |            |            |           |
   |    node    |   p1 node   |   p2 node   | base node  | link node  |   flags   |
   | (20 bytes) |  (20 bytes) |  (20 bytes) | (20 bytes) | (20 bytes) | (2 bytes) |
   |            |             |             |            |            |           |
   +------------------------------------------------------------------------------+
   </pre>
   <p>
   Version 4 (headerlen=103):
   </p>
   <pre>
   +------------------------------------------------------------------------------+----------+
   |            |             |             |            |            |           |          |
   |    node    |   p1 node   |   p2 node   | base node  | link node  |   flags   |  pflags  |
   | (20 bytes) |  (20 bytes) |  (20 bytes) | (20 bytes) | (20 bytes) | (2 bytes) | (1 byte) |
   |            |             |             |            |            |           |          |
   +------------------------------------------------------------------------------+----------+
   </pre>
   <p>
   The *delta data* consists of &quot;chunklen - 4 - headerlen&quot; bytes, which contain a
   series of *delta*s, densely packed (no separators). These deltas describe a diff
   from an existing entry (either that the recipient already has, or previously
   specified in the bundle/changegroup). The format is described more fully in
   &quot;hg help internals.bdiff&quot;, but briefly:
   </p>
   <pre>
   +---------------------------------------------------------------+
   |              |            |            |                      |
   | start offset | end offset | new length |        content       |
   |  (4 bytes)   |  (4 bytes) |  (4 bytes) | (&lt;new length&gt; bytes) |
   |              |            |            |                      |
   +---------------------------------------------------------------+
   </pre>
   <p>
   Please note that the length field in the delta data does *not* include itself.
   </p>
   <p>
   In version 1, the delta is always applied against the previous node from
   the changegroup or the first parent if this is the first entry in the
   changegroup.
   </p>
   <p>
   In version 2 and up, the delta base node is encoded in the entry in the
   changegroup. This allows the delta to be expressed against any parent,
   which can result in smaller deltas and more efficient encoding of data.
   </p>
   <p>
   The *flags* field holds bitwise flags affecting the processing of revision
   data. The following flags are defined:
   </p>
   <dl>
    <dt>32768
    <dd>Censored revision. The revision's fulltext has been replaced by censor metadata. May only occur on file revisions.
    <dt>16384
    <dd>Ellipsis revision. Revision hash does not match data (likely due to rewritten parents).
    <dt>8192
    <dd>Externally stored. The revision fulltext contains &quot;key:value&quot; &quot;\n&quot; delimited metadata defining an object stored elsewhere. Used by the LFS extension.
    <dt>4096
    <dd>Contains copy information. This revision changes files in a way that could affect copy tracing. This does *not* affect changegroup handling, but is relevant for other parts of Mercurial.
   </dl>
   <p>
   For historical reasons, the integer values are identical to revlog version 1
   per-revision storage flags and correspond to bits being set in this 2-byte
   field. Bits were allocated starting from the most-significant bit, hence the
   reverse ordering and allocation of these flags.
   </p>
   <p>
   The *pflags* (protocol flags) field holds bitwise flags affecting the protocol
   itself. They are first in the header since they may affect the handling of the
   rest of the fields in a future version. They are defined as such:
   </p>
   <dl>
    <dt>1 indicates whether to read a chunk of sidedata (of variable length) right
    <dd>after the revision flags.
   </dl>
   <h2>Changeset Segment</h2>
   <p>
   The *changeset segment* consists of a single *delta group* holding
   changelog data. The *empty chunk* at the end of the *delta group* denotes
   the boundary to the *manifest segment*.
   </p>
   <h2>Manifest Segment</h2>
   <p>
   The *manifest segment* consists of a single *delta group* holding manifest
   data. If treemanifests are in use, it contains only the manifest for the
   root directory of the repository. Otherwise, it contains the entire
   manifest data. The *empty chunk* at the end of the *delta group* denotes
   the boundary to the next segment (either the *treemanifests segment* or the
   *filelogs segment*, depending on version and the request options).
   </p>
   <h3>Treemanifests Segment</h3>
   <p>
   The *treemanifests segment* only exists in changegroup version &quot;3&quot; and &quot;4&quot;,
   and only if the 'treemanifest' param is part of the bundle2 changegroup part
   (it is not possible to use changegroup version 3 or 4 outside of bundle2).
   Aside from the filenames in the *treemanifests segment* containing a
   trailing &quot;/&quot; character, it behaves identically to the *filelogs segment*
   (see below). The final sub-segment is followed by an *empty chunk* (logically,
   a sub-segment with filename size 0). This denotes the boundary to the
   *filelogs segment*.
   </p>
   <h2>Filelogs Segment</h2>
   <p>
   The *filelogs segment* consists of multiple sub-segments, each
   corresponding to an individual file whose data is being described:
   </p>
   <pre>
   +--------------------------------------------------+
   |          |          |          |     |           |
   | filelog0 | filelog1 | filelog2 | ... |    0x0    |
   |          |          |          |     | (4 bytes) |
   |          |          |          |     |           |
   +--------------------------------------------------+
   </pre>
   <p>
   The final filelog sub-segment is followed by an *empty chunk* (logically,
   a sub-segment with filename size 0). This denotes the end of the segment
   and of the overall changegroup.
   </p>
   <p>
   Each filelog sub-segment consists of the following:
   </p>
   <pre>
   +------------------------------------------------------+
   |                 |                      |             |
   | filename length |       filename       | delta group |
   |    (4 bytes)    | (&lt;length - 4&gt; bytes) |  (various)  |
   |                 |                      |             |
   +------------------------------------------------------+
   </pre>
   <p>
   That is, a *chunk* consisting of the filename (not terminated or padded)
   followed by N chunks constituting the *delta group* for this file. The
   *empty chunk* at the end of each *delta group* denotes the boundary to the
   next filelog sub-segment.
   </p>
   
   </div>
   </div>
   </div>
   
   
   
   </body>
   </html>
   
 
   $ get-with-headers.py 127.0.0.1:$HGPORT "help/unknowntopic"
   404 Not Found
   
   <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.1//EN" "http://www.w3.org/TR/xhtml11/DTD/xhtml11.dtd">
   <html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en-US">
   <head>
   <link rel="icon" href="/static/hgicon.png" type="image/png" />
   <meta name="robots" content="index, nofollow" />
   <link rel="stylesheet" href="/static/style-paper.css" type="text/css" />
   <script type="text/javascript" src="/static/mercurial.js"></script>
   
   <title>test: error</title>
   </head>
   <body>
   
   <div class="container">
   <div class="menu">
   <div class="logo">
   <a href="https://mercurial-scm.org/">
   <img src="/static/hglogo.png" width=75 height=90 border=0 alt="mercurial" /></a>
   </div>
   <ul>
   <li><a href="/shortlog">log</a></li>
   <li><a href="/graph">graph</a></li>
   <li><a href="/tags">tags</a></li>
   <li><a href="/bookmarks">bookmarks</a></li>
   <li><a href="/branches">branches</a></li>
   </ul>
   <ul>
   <li><a href="/help">help</a></li>
   </ul>
   </div>
   
   <div class="main">
   
   <h2 class="breadcrumb"><a href="/">Mercurial</a> </h2>
   <h3>error</h3>
   
   
   <form class="search" action="/log">
   
   <p><input name="rev" id="search1" type="text" size="30" value="" /></p>
   <div id="hint">Find changesets by keywords (author, files, the commit message), revision
   number or hash, or <a href="/help/revsets">revset expression</a>.</div>
   </form>
   
   <div class="description">
   <p>
   An error occurred while processing your request:
   </p>
   <p>
   Not Found
   </p>
   </div>
   </div>
   </div>
   
   
   
   </body>
   </html>
   
   [1]
 
   $ killdaemons.py
 
 #endif