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# copies.py - copy detection for Mercurial
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#
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# Copyright 2008 Matt Mackall <mpm@selenic.com>
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#
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# This software may be used and distributed according to the terms of the
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# GNU General Public License version 2 or any later version.
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from __future__ import absolute_import
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import heapq
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from . import (
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node,
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pathutil,
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scmutil,
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util,
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)
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def _findlimit(repo, a, b):
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"""
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Find the last revision that needs to be checked to ensure that a full
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transitive closure for file copies can be properly calculated.
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Generally, this means finding the earliest revision number that's an
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ancestor of a or b but not both, except when a or b is a direct descendent
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of the other, in which case we can return the minimum revnum of a and b.
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None if no such revision exists.
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"""
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# basic idea:
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# - mark a and b with different sides
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# - if a parent's children are all on the same side, the parent is
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# on that side, otherwise it is on no side
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# - walk the graph in topological order with the help of a heap;
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# - add unseen parents to side map
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# - clear side of any parent that has children on different sides
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# - track number of interesting revs that might still be on a side
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# - track the lowest interesting rev seen
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# - quit when interesting revs is zero
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cl = repo.changelog
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working = len(cl) # pseudo rev for the working directory
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if a is None:
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a = working
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if b is None:
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b = working
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side = {a: -1, b: 1}
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visit = [-a, -b]
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heapq.heapify(visit)
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interesting = len(visit)
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hascommonancestor = False
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limit = working
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while interesting:
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r = -heapq.heappop(visit)
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if r == working:
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parents = [cl.rev(p) for p in repo.dirstate.parents()]
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else:
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parents = cl.parentrevs(r)
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for p in parents:
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if p < 0:
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continue
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if p not in side:
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# first time we see p; add it to visit
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side[p] = side[r]
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if side[p]:
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interesting += 1
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heapq.heappush(visit, -p)
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elif side[p] and side[p] != side[r]:
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# p was interesting but now we know better
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side[p] = 0
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interesting -= 1
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hascommonancestor = True
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if side[r]:
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limit = r # lowest rev visited
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interesting -= 1
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if not hascommonancestor:
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return None
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# Consider the following flow (see test-commit-amend.t under issue4405):
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# 1/ File 'a0' committed
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# 2/ File renamed from 'a0' to 'a1' in a new commit (call it 'a1')
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# 3/ Move back to first commit
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# 4/ Create a new commit via revert to contents of 'a1' (call it 'a1-amend')
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# 5/ Rename file from 'a1' to 'a2' and commit --amend 'a1-msg'
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#
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# During the amend in step five, we will be in this state:
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#
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# @ 3 temporary amend commit for a1-amend
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# |
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# o 2 a1-amend
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# |
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# | o 1 a1
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# |/
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# o 0 a0
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#
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# When _findlimit is called, a and b are revs 3 and 0, so limit will be 2,
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# yet the filelog has the copy information in rev 1 and we will not look
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# back far enough unless we also look at the a and b as candidates.
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# This only occurs when a is a descendent of b or visa-versa.
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return min(limit, a, b)
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def _chain(src, dst, a, b):
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'''chain two sets of copies a->b'''
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t = a.copy()
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for k, v in b.iteritems():
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if v in t:
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# found a chain
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if t[v] != k:
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# file wasn't renamed back to itself
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t[k] = t[v]
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if v not in dst:
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# chain was a rename, not a copy
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del t[v]
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if v in src:
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# file is a copy of an existing file
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t[k] = v
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# remove criss-crossed copies
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for k, v in t.items():
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if k in src and v in dst:
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del t[k]
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return t
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def _tracefile(fctx, am, limit=-1):
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'''return file context that is the ancestor of fctx present in ancestor
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manifest am, stopping after the first ancestor lower than limit'''
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for f in fctx.ancestors():
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if am.get(f.path(), None) == f.filenode():
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return f
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if limit >= 0 and f.linkrev() < limit and f.rev() < limit:
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return None
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def _dirstatecopies(d):
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ds = d._repo.dirstate
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c = ds.copies().copy()
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for k in c.keys():
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if ds[k] not in 'anm':
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del c[k]
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return c
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def _computeforwardmissing(a, b, match=None):
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"""Computes which files are in b but not a.
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This is its own function so extensions can easily wrap this call to see what
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files _forwardcopies is about to process.
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"""
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ma = a.manifest()
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mb = b.manifest()
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if match:
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ma = ma.matches(match)
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mb = mb.matches(match)
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return mb.filesnotin(ma)
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def _forwardcopies(a, b, match=None):
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'''find {dst@b: src@a} copy mapping where a is an ancestor of b'''
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# check for working copy
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w = None
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if b.rev() is None:
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w = b
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b = w.p1()
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if a == b:
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# short-circuit to avoid issues with merge states
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return _dirstatecopies(w)
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# files might have to be traced back to the fctx parent of the last
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# one-side-only changeset, but not further back than that
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limit = _findlimit(a._repo, a.rev(), b.rev())
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if limit is None:
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limit = -1
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am = a.manifest()
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# find where new files came from
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# we currently don't try to find where old files went, too expensive
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# this means we can miss a case like 'hg rm b; hg cp a b'
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cm = {}
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# Computing the forward missing is quite expensive on large manifests, since
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# it compares the entire manifests. We can optimize it in the common use
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# case of computing what copies are in a commit versus its parent (like
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# during a rebase or histedit). Note, we exclude merge commits from this
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# optimization, since the ctx.files() for a merge commit is not correct for
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# this comparison.
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forwardmissingmatch = match
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if not match and b.p1() == a and b.p2().node() == node.nullid:
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forwardmissingmatch = scmutil.matchfiles(a._repo, b.files())
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missing = _computeforwardmissing(a, b, match=forwardmissingmatch)
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ancestrycontext = a._repo.changelog.ancestors([b.rev()], inclusive=True)
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for f in missing:
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fctx = b[f]
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fctx._ancestrycontext = ancestrycontext
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ofctx = _tracefile(fctx, am, limit)
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if ofctx:
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cm[f] = ofctx.path()
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# combine copies from dirstate if necessary
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if w is not None:
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cm = _chain(a, w, cm, _dirstatecopies(w))
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return cm
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def _backwardrenames(a, b):
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if a._repo.ui.configbool('experimental', 'disablecopytrace'):
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return {}
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# Even though we're not taking copies into account, 1:n rename situations
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# can still exist (e.g. hg cp a b; hg mv a c). In those cases we
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# arbitrarily pick one of the renames.
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f = _forwardcopies(b, a)
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r = {}
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for k, v in sorted(f.iteritems()):
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# remove copies
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if v in a:
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continue
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r[v] = k
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return r
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def pathcopies(x, y, match=None):
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'''find {dst@y: src@x} copy mapping for directed compare'''
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if x == y or not x or not y:
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return {}
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a = y.ancestor(x)
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if a == x:
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return _forwardcopies(x, y, match=match)
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if a == y:
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return _backwardrenames(x, y)
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return _chain(x, y, _backwardrenames(x, a),
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_forwardcopies(a, y, match=match))
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def _computenonoverlap(repo, c1, c2, addedinm1, addedinm2):
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"""Computes, based on addedinm1 and addedinm2, the files exclusive to c1
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and c2. This is its own function so extensions can easily wrap this call
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to see what files mergecopies is about to process.
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Even though c1 and c2 are not used in this function, they are useful in
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other extensions for being able to read the file nodes of the changed files.
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"""
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u1 = sorted(addedinm1 - addedinm2)
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u2 = sorted(addedinm2 - addedinm1)
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if u1:
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repo.ui.debug(" unmatched files in local:\n %s\n"
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% "\n ".join(u1))
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if u2:
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repo.ui.debug(" unmatched files in other:\n %s\n"
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% "\n ".join(u2))
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return u1, u2
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def _makegetfctx(ctx):
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"""return a 'getfctx' function suitable for checkcopies usage
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We have to re-setup the function building 'filectx' for each
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'checkcopies' to ensure the linkrev adjustment is properly setup for
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each. Linkrev adjustment is important to avoid bug in rename
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detection. Moreover, having a proper '_ancestrycontext' setup ensures
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the performance impact of this adjustment is kept limited. Without it,
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each file could do a full dag traversal making the time complexity of
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the operation explode (see issue4537).
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This function exists here mostly to limit the impact on stable. Feel
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free to refactor on default.
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"""
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rev = ctx.rev()
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repo = ctx._repo
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ac = getattr(ctx, '_ancestrycontext', None)
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if ac is None:
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revs = [rev]
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if rev is None:
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revs = [p.rev() for p in ctx.parents()]
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ac = repo.changelog.ancestors(revs, inclusive=True)
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ctx._ancestrycontext = ac
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def makectx(f, n):
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if len(n) != 20: # in a working context?
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if ctx.rev() is None:
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return ctx.filectx(f)
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return repo[None][f]
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fctx = repo.filectx(f, fileid=n)
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# setup only needed for filectx not create from a changectx
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fctx._ancestrycontext = ac
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fctx._descendantrev = rev
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return fctx
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return util.lrucachefunc(makectx)
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def mergecopies(repo, c1, c2, ca):
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"""
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Find moves and copies between context c1 and c2 that are relevant
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for merging.
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Returns four dicts: "copy", "movewithdir", "diverge", and
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"renamedelete".
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"copy" is a mapping from destination name -> source name,
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where source is in c1 and destination is in c2 or vice-versa.
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"movewithdir" is a mapping from source name -> destination name,
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where the file at source present in one context but not the other
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needs to be moved to destination by the merge process, because the
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other context moved the directory it is in.
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"diverge" is a mapping of source name -> list of destination names
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for divergent renames.
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"renamedelete" is a mapping of source name -> list of destination
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names for files deleted in c1 that were renamed in c2 or vice-versa.
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"""
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# avoid silly behavior for update from empty dir
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if not c1 or not c2 or c1 == c2:
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return {}, {}, {}, {}
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# avoid silly behavior for parent -> working dir
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if c2.node() is None and c1.node() == repo.dirstate.p1():
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return repo.dirstate.copies(), {}, {}, {}
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# Copy trace disabling is explicitly below the node == p1 logic above
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# because the logic above is required for a simple copy to be kept across a
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# rebase.
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if repo.ui.configbool('experimental', 'disablecopytrace'):
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return {}, {}, {}, {}
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limit = _findlimit(repo, c1.rev(), c2.rev())
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if limit is None:
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# no common ancestor, no copies
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return {}, {}, {}, {}
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repo.ui.debug(" searching for copies back to rev %d\n" % limit)
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m1 = c1.manifest()
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m2 = c2.manifest()
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ma = ca.manifest()
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copy1, copy2, = {}, {}
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movewithdir1, movewithdir2 = {}, {}
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fullcopy1, fullcopy2 = {}, {}
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diverge = {}
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# find interesting file sets from manifests
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addedinm1 = m1.filesnotin(ma)
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addedinm2 = m2.filesnotin(ma)
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u1, u2 = _computenonoverlap(repo, c1, c2, addedinm1, addedinm2)
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bothnew = sorted(addedinm1 & addedinm2)
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for f in u1:
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checkcopies(c1, f, m1, m2, ca, limit, diverge, copy1, fullcopy1)
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for f in u2:
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checkcopies(c2, f, m2, m1, ca, limit, diverge, copy2, fullcopy2)
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copy = dict(copy1.items() + copy2.items())
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movewithdir = dict(movewithdir1.items() + movewithdir2.items())
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fullcopy = dict(fullcopy1.items() + fullcopy2.items())
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renamedelete = {}
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renamedeleteset = set()
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divergeset = set()
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for of, fl in diverge.items():
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if len(fl) == 1 or of in c1 or of in c2:
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del diverge[of] # not actually divergent, or not a rename
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if of not in c1 and of not in c2:
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# renamed on one side, deleted on the other side, but filter
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# out files that have been renamed and then deleted
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renamedelete[of] = [f for f in fl if f in c1 or f in c2]
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renamedeleteset.update(fl) # reverse map for below
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else:
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divergeset.update(fl) # reverse map for below
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if bothnew:
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repo.ui.debug(" unmatched files new in both:\n %s\n"
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% "\n ".join(bothnew))
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bothdiverge, _copy, _fullcopy = {}, {}, {}
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for f in bothnew:
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checkcopies(c1, f, m1, m2, ca, limit, bothdiverge, _copy, _fullcopy)
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checkcopies(c2, f, m2, m1, ca, limit, bothdiverge, _copy, _fullcopy)
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for of, fl in bothdiverge.items():
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if len(fl) == 2 and fl[0] == fl[1]:
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copy[fl[0]] = of # not actually divergent, just matching renames
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if fullcopy and repo.ui.debugflag:
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repo.ui.debug(" all copies found (* = to merge, ! = divergent, "
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"% = renamed and deleted):\n")
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for f in sorted(fullcopy):
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note = ""
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if f in copy:
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note += "*"
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if f in divergeset:
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note += "!"
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if f in renamedeleteset:
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note += "%"
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repo.ui.debug(" src: '%s' -> dst: '%s' %s\n" % (fullcopy[f], f,
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note))
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del divergeset
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if not fullcopy:
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return copy, movewithdir, diverge, renamedelete
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repo.ui.debug(" checking for directory renames\n")
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# generate a directory move map
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d1, d2 = c1.dirs(), c2.dirs()
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# Hack for adding '', which is not otherwise added, to d1 and d2
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d1.addpath('/')
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d2.addpath('/')
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invalid = set()
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dirmove = {}
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# examine each file copy for a potential directory move, which is
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# when all the files in a directory are moved to a new directory
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for dst, src in fullcopy.iteritems():
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dsrc, ddst = pathutil.dirname(src), pathutil.dirname(dst)
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if dsrc in invalid:
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# already seen to be uninteresting
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continue
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elif dsrc in d1 and ddst in d1:
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# directory wasn't entirely moved locally
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invalid.add(dsrc + "/")
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elif dsrc in d2 and ddst in d2:
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|
# directory wasn't entirely moved remotely
|
|
|
invalid.add(dsrc + "/")
|
|
|
elif dsrc + "/" in dirmove and dirmove[dsrc + "/"] != ddst + "/":
|
|
|
# files from the same directory moved to two different places
|
|
|
invalid.add(dsrc + "/")
|
|
|
else:
|
|
|
# looks good so far
|
|
|
dirmove[dsrc + "/"] = ddst + "/"
|
|
|
|
|
|
for i in invalid:
|
|
|
if i in dirmove:
|
|
|
del dirmove[i]
|
|
|
del d1, d2, invalid
|
|
|
|
|
|
if not dirmove:
|
|
|
return copy, movewithdir, diverge, renamedelete
|
|
|
|
|
|
for d in dirmove:
|
|
|
repo.ui.debug(" discovered dir src: '%s' -> dst: '%s'\n" %
|
|
|
(d, dirmove[d]))
|
|
|
|
|
|
# check unaccounted nonoverlapping files against directory moves
|
|
|
for f in u1 + u2:
|
|
|
if f not in fullcopy:
|
|
|
for d in dirmove:
|
|
|
if f.startswith(d):
|
|
|
# new file added in a directory that was moved, move it
|
|
|
df = dirmove[d] + f[len(d):]
|
|
|
if df not in copy:
|
|
|
movewithdir[f] = df
|
|
|
repo.ui.debug((" pending file src: '%s' -> "
|
|
|
"dst: '%s'\n") % (f, df))
|
|
|
break
|
|
|
|
|
|
return copy, movewithdir, diverge, renamedelete
|
|
|
|
|
|
def checkcopies(ctx, f, m1, m2, ca, limit, diverge, copy, fullcopy):
|
|
|
"""
|
|
|
check possible copies of f from m1 to m2
|
|
|
|
|
|
ctx = starting context for f in m1
|
|
|
f = the filename to check
|
|
|
m1 = the source manifest
|
|
|
m2 = the destination manifest
|
|
|
ca = the changectx of the common ancestor
|
|
|
limit = the rev number to not search beyond
|
|
|
diverge = record all diverges in this dict
|
|
|
copy = record all non-divergent copies in this dict
|
|
|
fullcopy = record all copies in this dict
|
|
|
"""
|
|
|
|
|
|
ma = ca.manifest()
|
|
|
getfctx = _makegetfctx(ctx)
|
|
|
|
|
|
def _related(f1, f2, limit):
|
|
|
# Walk back to common ancestor to see if the two files originate
|
|
|
# from the same file. Since workingfilectx's rev() is None it messes
|
|
|
# up the integer comparison logic, hence the pre-step check for
|
|
|
# None (f1 and f2 can only be workingfilectx's initially).
|
|
|
|
|
|
if f1 == f2:
|
|
|
return f1 # a match
|
|
|
|
|
|
g1, g2 = f1.ancestors(), f2.ancestors()
|
|
|
try:
|
|
|
f1r, f2r = f1.linkrev(), f2.linkrev()
|
|
|
|
|
|
if f1r is None:
|
|
|
f1 = g1.next()
|
|
|
if f2r is None:
|
|
|
f2 = g2.next()
|
|
|
|
|
|
while True:
|
|
|
f1r, f2r = f1.linkrev(), f2.linkrev()
|
|
|
if f1r > f2r:
|
|
|
f1 = g1.next()
|
|
|
elif f2r > f1r:
|
|
|
f2 = g2.next()
|
|
|
elif f1 == f2:
|
|
|
return f1 # a match
|
|
|
elif f1r == f2r or f1r < limit or f2r < limit:
|
|
|
return False # copy no longer relevant
|
|
|
except StopIteration:
|
|
|
return False
|
|
|
|
|
|
of = None
|
|
|
seen = set([f])
|
|
|
for oc in getfctx(f, m1[f]).ancestors():
|
|
|
ocr = oc.linkrev()
|
|
|
of = oc.path()
|
|
|
if of in seen:
|
|
|
# check limit late - grab last rename before
|
|
|
if ocr < limit:
|
|
|
break
|
|
|
continue
|
|
|
seen.add(of)
|
|
|
|
|
|
fullcopy[f] = of # remember for dir rename detection
|
|
|
if of not in m2:
|
|
|
continue # no match, keep looking
|
|
|
if m2[of] == ma.get(of):
|
|
|
break # no merge needed, quit early
|
|
|
c2 = getfctx(of, m2[of])
|
|
|
cr = _related(oc, c2, ca.rev())
|
|
|
if cr and (of == f or of == c2.path()): # non-divergent
|
|
|
copy[f] = of
|
|
|
of = None
|
|
|
break
|
|
|
|
|
|
if of in ma:
|
|
|
diverge.setdefault(of, []).append(f)
|
|
|
|
|
|
def duplicatecopies(repo, rev, fromrev, skiprev=None):
|
|
|
'''reproduce copies from fromrev to rev in the dirstate
|
|
|
|
|
|
If skiprev is specified, it's a revision that should be used to
|
|
|
filter copy records. Any copies that occur between fromrev and
|
|
|
skiprev will not be duplicated, even if they appear in the set of
|
|
|
copies between fromrev and rev.
|
|
|
'''
|
|
|
exclude = {}
|
|
|
if (skiprev is not None and
|
|
|
not repo.ui.configbool('experimental', 'disablecopytrace')):
|
|
|
# disablecopytrace skips this line, but not the entire function because
|
|
|
# the line below is O(size of the repo) during a rebase, while the rest
|
|
|
# of the function is much faster (and is required for carrying copy
|
|
|
# metadata across the rebase anyway).
|
|
|
exclude = pathcopies(repo[fromrev], repo[skiprev])
|
|
|
for dst, src in pathcopies(repo[fromrev], repo[rev]).iteritems():
|
|
|
# copies.pathcopies returns backward renames, so dst might not
|
|
|
# actually be in the dirstate
|
|
|
if dst in exclude:
|
|
|
continue
|
|
|
if repo.dirstate[dst] in "nma":
|
|
|
repo.dirstate.copy(src, dst)
|
|
|
|
