git: initialize `extra` to have at least the branch name for nullid

Otherwise, this crashes trying to convert to local encoding:

    ...
      File "/mnt/c/Users/Matt/hg/mercurial/logcmdutil.py", line 333, in _show
        branch = ctx.branch()
      File "/mnt/c/Users/Matt/hg/mercurial/context.py", line 675, in branch
        return encoding.tolocal(self._changeset.extra.get(b"branch"))
      File "/mnt/c/Users/Matt/hg/mercurial/encoding.py", line 181, in tolocal
        if isasciistr(s):
    TypeError: a bytes-like object is required, not 'NoneType'

This was originally reported to the thg bug tracker.

https://foss.heptapod.net/mercurial/tortoisehg/thg/-/issues/5629

Differential Revision: https://phab.mercurial-scm.org/D10528

hgext/git/gitlog.py

@@ -1,548 +1,549 b''
 from __future__ import absolute_import
 
 from mercurial.i18n import _
 
 from mercurial.node import (
     bin,
     hex,
     nullhex,
     nullid,
     nullrev,
     sha1nodeconstants,
     wdirhex,
 )
 from mercurial import (
     ancestor,
     changelog as hgchangelog,
     dagop,
     encoding,
     error,
     manifest,
     pycompat,
 )
 from mercurial.interfaces import (
     repository,
     util as interfaceutil,
 )
 from mercurial.utils import stringutil
 from . import (
     gitutil,
     index,
     manifest as gitmanifest,
 )
 
 pygit2 = gitutil.get_pygit2()
 
 
 class baselog(object):  # revlog.revlog):
     """Common implementations between changelog and manifestlog."""
 
     def __init__(self, gr, db):
         self.gitrepo = gr
         self._db = db
 
     def __len__(self):
         return int(
             self._db.execute('SELECT COUNT(*) FROM changelog').fetchone()[0]
         )
 
     def rev(self, n):
         if n == nullid:
             return -1
         t = self._db.execute(
             'SELECT rev FROM changelog WHERE node = ?', (gitutil.togitnode(n),)
         ).fetchone()
         if t is None:
             raise error.LookupError(n, b'00changelog.i', _(b'no node %d'))
         return t[0]
 
     def node(self, r):
         if r == nullrev:
             return nullid
         t = self._db.execute(
             'SELECT node FROM changelog WHERE rev = ?', (r,)
         ).fetchone()
         if t is None:
             raise error.LookupError(r, b'00changelog.i', _(b'no node'))
         return bin(t[0])
 
     def hasnode(self, n):
         t = self._db.execute(
             'SELECT node FROM changelog WHERE node = ?',
             (pycompat.sysstr(n),),
         ).fetchone()
         return t is not None
 
 
 class baselogindex(object):
     def __init__(self, log):
         self._log = log
 
     def has_node(self, n):
         return self._log.rev(n) != -1
 
     def __len__(self):
         return len(self._log)
 
     def __getitem__(self, idx):
         p1rev, p2rev = self._log.parentrevs(idx)
         # TODO: it's messy that the index leaks so far out of the
         # storage layer that we have to implement things like reading
         # this raw tuple, which exposes revlog internals.
         return (
             # Pretend offset is just the index, since we don't really care.
             idx,
             # Same with lengths
             idx,  # length
             idx,  # rawsize
             -1,  # delta base
             idx,  # linkrev TODO is this right?
             p1rev,
             p2rev,
             self._log.node(idx),
         )
 
 
 # TODO: an interface for the changelog type?
 class changelog(baselog):
     # TODO: this appears to be an enumerated type, and should probably
     # be part of the public changelog interface
     _copiesstorage = b'extra'
 
     def __contains__(self, rev):
         try:
             self.node(rev)
             return True
         except error.LookupError:
             return False
 
     def __iter__(self):
         return iter(pycompat.xrange(len(self)))
 
     @property
     def filteredrevs(self):
         # TODO: we should probably add a refs/hg/ namespace for hidden
         # heads etc, but that's an idea for later.
         return set()
 
     @property
     def index(self):
         return baselogindex(self)
 
     @property
     def nodemap(self):
         r = {
             bin(v[0]): v[1]
             for v in self._db.execute('SELECT node, rev FROM changelog')
         }
         r[nullid] = nullrev
         return r
 
     def tip(self):
         t = self._db.execute(
             'SELECT node FROM changelog ORDER BY rev DESC LIMIT 1'
         ).fetchone()
         if t:
             return bin(t[0])
         return nullid
 
     def revs(self, start=0, stop=None):
         if stop is None:
             stop = self.tiprev()
         t = self._db.execute(
             'SELECT rev FROM changelog '
             'WHERE rev >= ? AND rev <= ? '
             'ORDER BY REV ASC',
             (start, stop),
         )
         return (int(r[0]) for r in t)
 
     def tiprev(self):
         t = self._db.execute(
             'SELECT rev FROM changelog ' 'ORDER BY REV DESC ' 'LIMIT 1'
         ).fetchone()
 
         if t is not None:
             return t[0]
         return -1
 
     def _partialmatch(self, id):
         if wdirhex.startswith(id):
             raise error.WdirUnsupported
         candidates = [
             bin(x[0])
             for x in self._db.execute(
                 'SELECT node FROM changelog WHERE node LIKE ?',
                 (pycompat.sysstr(id + b'%'),),
             )
         ]
         if nullhex.startswith(id):
             candidates.append(nullid)
         if len(candidates) > 1:
             raise error.AmbiguousPrefixLookupError(
                 id, b'00changelog.i', _(b'ambiguous identifier')
             )
         if candidates:
             return candidates[0]
         return None
 
     def flags(self, rev):
         return 0
 
     def shortest(self, node, minlength=1):
         nodehex = hex(node)
         for attempt in pycompat.xrange(minlength, len(nodehex) + 1):
             candidate = nodehex[:attempt]
             matches = int(
                 self._db.execute(
                     'SELECT COUNT(*) FROM changelog WHERE node LIKE ?',
                     (pycompat.sysstr(candidate + b'%'),),
                 ).fetchone()[0]
             )
             if matches == 1:
                 return candidate
         return nodehex
 
     def headrevs(self, revs=None):
         realheads = [
             int(x[0])
             for x in self._db.execute(
                 'SELECT rev FROM changelog '
                 'INNER JOIN heads ON changelog.node = heads.node'
             )
         ]
         if revs:
             return sorted([r for r in revs if r in realheads])
         return sorted(realheads)
 
     def changelogrevision(self, nodeorrev):
         # Ensure we have a node id
         if isinstance(nodeorrev, int):
             n = self.node(nodeorrev)
         else:
             n = nodeorrev
+        extra = {b'branch': b'default'}
         # handle looking up nullid
         if n == nullid:
-            return hgchangelog._changelogrevision(extra={}, manifest=nullid)
+            return hgchangelog._changelogrevision(extra=extra, manifest=nullid)
         hn = gitutil.togitnode(n)
         # We've got a real commit!
         files = [
             r[0]
             for r in self._db.execute(
                 'SELECT filename FROM changedfiles '
                 'WHERE node = ? and filenode != ?',
                 (hn, gitutil.nullgit),
             )
         ]
         filesremoved = [
             r[0]
             for r in self._db.execute(
                 'SELECT filename FROM changedfiles '
                 'WHERE node = ? and filenode = ?',
                 (hn, gitutil.nullgit),
             )
         ]
         c = self.gitrepo[hn]
         return hgchangelog._changelogrevision(
             manifest=n,  # pretend manifest the same as the commit node
             user=b'%s <%s>'
             % (c.author.name.encode('utf8'), c.author.email.encode('utf8')),
             date=(c.author.time, -c.author.offset * 60),
             files=files,
             # TODO filesadded in the index
             filesremoved=filesremoved,
             description=c.message.encode('utf8'),
             # TODO do we want to handle extra? how?
-            extra={b'branch': b'default'},
+            extra=extra,
         )
 
     def ancestors(self, revs, stoprev=0, inclusive=False):
         revs = list(revs)
         tip = self.rev(self.tip())
         for r in revs:
             if r > tip:
                 raise IndexError(b'Invalid rev %r' % r)
         return ancestor.lazyancestors(
             self.parentrevs, revs, stoprev=stoprev, inclusive=inclusive
         )
 
     # Cleanup opportunity: this is *identical* to the revlog.py version
     def descendants(self, revs):
         return dagop.descendantrevs(revs, self.revs, self.parentrevs)
 
     def incrementalmissingrevs(self, common=None):
         """Return an object that can be used to incrementally compute the
         revision numbers of the ancestors of arbitrary sets that are not
         ancestors of common. This is an ancestor.incrementalmissingancestors
         object.
 
         'common' is a list of revision numbers. If common is not supplied, uses
         nullrev.
         """
         if common is None:
             common = [nullrev]
 
         return ancestor.incrementalmissingancestors(self.parentrevs, common)
 
     def findmissing(self, common=None, heads=None):
         """Return the ancestors of heads that are not ancestors of common.
 
         More specifically, return a list of nodes N such that every N
         satisfies the following constraints:
 
           1. N is an ancestor of some node in 'heads'
           2. N is not an ancestor of any node in 'common'
 
         The list is sorted by revision number, meaning it is
         topologically sorted.
 
         'heads' and 'common' are both lists of node IDs.  If heads is
         not supplied, uses all of the revlog's heads.  If common is not
         supplied, uses nullid."""
         if common is None:
             common = [nullid]
         if heads is None:
             heads = self.heads()
 
         common = [self.rev(n) for n in common]
         heads = [self.rev(n) for n in heads]
 
         inc = self.incrementalmissingrevs(common=common)
         return [self.node(r) for r in inc.missingancestors(heads)]
 
     def children(self, node):
         """find the children of a given node"""
         c = []
         p = self.rev(node)
         for r in self.revs(start=p + 1):
             prevs = [pr for pr in self.parentrevs(r) if pr != nullrev]
             if prevs:
                 for pr in prevs:
                     if pr == p:
                         c.append(self.node(r))
             elif p == nullrev:
                 c.append(self.node(r))
         return c
 
     def reachableroots(self, minroot, heads, roots, includepath=False):
         return dagop._reachablerootspure(
             self.parentrevs, minroot, roots, heads, includepath
         )
 
     # Cleanup opportunity: this is *identical* to the revlog.py version
     def isancestor(self, a, b):
         a, b = self.rev(a), self.rev(b)
         return self.isancestorrev(a, b)
 
     # Cleanup opportunity: this is *identical* to the revlog.py version
     def isancestorrev(self, a, b):
         if a == nullrev:
             return True
         elif a == b:
             return True
         elif a > b:
             return False
         return bool(self.reachableroots(a, [b], [a], includepath=False))
 
     def parentrevs(self, rev):
         n = self.node(rev)
         hn = gitutil.togitnode(n)
         if hn != gitutil.nullgit:
             c = self.gitrepo[hn]
         else:
             return nullrev, nullrev
         p1 = p2 = nullrev
         if c.parents:
             p1 = self.rev(c.parents[0].id.raw)
             if len(c.parents) > 2:
                 raise error.Abort(b'TODO octopus merge handling')
             if len(c.parents) == 2:
                 p2 = self.rev(c.parents[1].id.raw)
         return p1, p2
 
     # Private method is used at least by the tags code.
     _uncheckedparentrevs = parentrevs
 
     def commonancestorsheads(self, a, b):
         # TODO the revlog verson of this has a C path, so we probably
         # need to optimize this...
         a, b = self.rev(a), self.rev(b)
         return [
             self.node(n)
             for n in ancestor.commonancestorsheads(self.parentrevs, a, b)
         ]
 
     def branchinfo(self, rev):
         """Git doesn't do named branches, so just put everything on default."""
         return b'default', False
 
     def delayupdate(self, tr):
         # TODO: I think we can elide this because we're just dropping
         # an object in the git repo?
         pass
 
     def add(
         self,
         manifest,
         files,
         desc,
         transaction,
         p1,
         p2,
         user,
         date=None,
         extra=None,
         p1copies=None,
         p2copies=None,
         filesadded=None,
         filesremoved=None,
     ):
         parents = []
         hp1, hp2 = gitutil.togitnode(p1), gitutil.togitnode(p2)
         if p1 != nullid:
             parents.append(hp1)
         if p2 and p2 != nullid:
             parents.append(hp2)
         assert date is not None
         timestamp, tz = date
         sig = pygit2.Signature(
             encoding.unifromlocal(stringutil.person(user)),
             encoding.unifromlocal(stringutil.email(user)),
             int(timestamp),
             -int(tz // 60),
         )
         oid = self.gitrepo.create_commit(
             None, sig, sig, desc, gitutil.togitnode(manifest), parents
         )
         # Set up an internal reference to force the commit into the
         # changelog. Hypothetically, we could even use this refs/hg/
         # namespace to allow for anonymous heads on git repos, which
         # would be neat.
         self.gitrepo.references.create(
             'refs/hg/internal/latest-commit', oid, force=True
         )
         # Reindex now to pick up changes. We omit the progress
         # and log callbacks because this will be very quick.
         index._index_repo(self.gitrepo, self._db)
         return oid.raw
 
 
 class manifestlog(baselog):
     nodeconstants = sha1nodeconstants
 
     def __getitem__(self, node):
         return self.get(b'', node)
 
     def get(self, relpath, node):
         if node == nullid:
             # TODO: this should almost certainly be a memgittreemanifestctx
             return manifest.memtreemanifestctx(self, relpath)
         commit = self.gitrepo[gitutil.togitnode(node)]
         t = commit.tree
         if relpath:
             parts = relpath.split(b'/')
             for p in parts:
                 te = t[p]
                 t = self.gitrepo[te.id]
         return gitmanifest.gittreemanifestctx(self.gitrepo, t)
 
 
 @interfaceutil.implementer(repository.ifilestorage)
 class filelog(baselog):
     def __init__(self, gr, db, path):
         super(filelog, self).__init__(gr, db)
         assert isinstance(path, bytes)
         self.path = path
 
     def read(self, node):
         if node == nullid:
             return b''
         return self.gitrepo[gitutil.togitnode(node)].data
 
     def lookup(self, node):
         if len(node) not in (20, 40):
             node = int(node)
         if isinstance(node, int):
             assert False, b'todo revnums for nodes'
         if len(node) == 40:
             node = bin(node)
         hnode = gitutil.togitnode(node)
         if hnode in self.gitrepo:
             return node
         raise error.LookupError(self.path, node, _(b'no match found'))
 
     def cmp(self, node, text):
         """Returns True if text is different than content at `node`."""
         return self.read(node) != text
 
     def add(self, text, meta, transaction, link, p1=None, p2=None):
         assert not meta  # Should we even try to handle this?
         return self.gitrepo.create_blob(text).raw
 
     def __iter__(self):
         for clrev in self._db.execute(
             '''
 SELECT rev FROM changelog
 INNER JOIN changedfiles ON changelog.node = changedfiles.node
 WHERE changedfiles.filename = ? AND changedfiles.filenode != ?
         ''',
             (pycompat.fsdecode(self.path), gitutil.nullgit),
         ):
             yield clrev[0]
 
     def linkrev(self, fr):
         return fr
 
     def rev(self, node):
         row = self._db.execute(
             '''
 SELECT rev FROM changelog
 INNER JOIN changedfiles ON changelog.node = changedfiles.node
 WHERE changedfiles.filename = ? AND changedfiles.filenode = ?''',
             (pycompat.fsdecode(self.path), gitutil.togitnode(node)),
         ).fetchone()
         if row is None:
             raise error.LookupError(self.path, node, _(b'no such node'))
         return int(row[0])
 
     def node(self, rev):
         maybe = self._db.execute(
             '''SELECT filenode FROM changedfiles
 INNER JOIN changelog ON changelog.node = changedfiles.node
 WHERE changelog.rev = ? AND filename = ?
 ''',
             (rev, pycompat.fsdecode(self.path)),
         ).fetchone()
         if maybe is None:
             raise IndexError('gitlog %r out of range %d' % (self.path, rev))
         return bin(maybe[0])
 
     def parents(self, node):
         gn = gitutil.togitnode(node)
         gp = pycompat.fsdecode(self.path)
         ps = []
         for p in self._db.execute(
             '''SELECT p1filenode, p2filenode FROM changedfiles
 WHERE filenode = ? AND filename = ?
 ''',
             (gn, gp),
         ).fetchone():
             if p is None:
                 commit = self._db.execute(
                     "SELECT node FROM changedfiles "
                     "WHERE filenode = ? AND filename = ?",
                     (gn, gp),
                 ).fetchone()[0]
                 # This filelog is missing some data. Build the
                 # filelog, then recurse (which will always find data).
                 if pycompat.ispy3:
                     commit = commit.decode('ascii')
                 index.fill_in_filelog(self.gitrepo, self._db, commit, gp, gn)
                 return self.parents(node)
             else:
                 ps.append(bin(p))
         return ps
 
     def renamed(self, node):
         # TODO: renames/copies
         return False

tests/test-git-interop.t

@@ -1,418 +1,424 b''
 #require pygit2 no-windows
 
 Setup:
   $ GIT_AUTHOR_NAME='test'; export GIT_AUTHOR_NAME
   > GIT_AUTHOR_EMAIL='[e-mail]'; export GIT_AUTHOR_EMAIL
   > GIT_AUTHOR_DATE="2007-01-01 00:00:00 +0000"; export GIT_AUTHOR_DATE
   > GIT_COMMITTER_NAME="$GIT_AUTHOR_NAME"; export GIT_COMMITTER_NAME
   > GIT_COMMITTER_EMAIL="$GIT_AUTHOR_EMAIL"; export GIT_COMMITTER_EMAIL
   > GIT_COMMITTER_DATE="$GIT_AUTHOR_DATE"; export GIT_COMMITTER_DATE
   > count=10
   > gitcommit() {
   >    GIT_AUTHOR_DATE="2007-01-01 00:00:$count +0000";
   >    GIT_COMMITTER_DATE="$GIT_AUTHOR_DATE"
   >    git commit "$@" >/dev/null 2>/dev/null || echo "git commit error"
   >    count=`expr $count + 1`
   >  }
   $ git config --global init.defaultBranch master
 
 
   $ hg version -v --config extensions.git= | grep '^[E ]'
   Enabled extensions:
     git  internal  (pygit2 *) (glob)
 
 Test auto-loading extension works:
   $ mkdir nogit
   $ cd nogit
   $ mkdir .hg
   $ echo git >> .hg/requires
   $ hg status
   abort: repository specified git format in .hg/requires but has no .git directory
   [255]
   $ git config --global init.defaultBranch master
   $ git init
   Initialized empty Git repository in $TESTTMP/nogit/.git/
 This status invocation shows some hg gunk because we didn't use
 `hg init --git`, which fixes up .git/info/exclude for us.
   $ hg status
   ? .hg/cache/git-commits.sqlite
   ? .hg/cache/git-commits.sqlite-shm
   ? .hg/cache/git-commits.sqlite-wal
   ? .hg/requires
   $ cd ..
 
 Now globally enable extension for the rest of the test:
   $ cat <<EOF >> $HGRCPATH
   > [extensions]
   > git=
   > [git]
   > log-index-cache-miss = yes
   > EOF
 
 Test some edge cases around a commitless repo first
   $ mkdir empty
   $ cd empty
   $ git init
   Initialized empty Git repository in $TESTTMP/empty/.git/
   $ hg init --git
   $ hg heads
   [1]
+  $ hg tip
+  changeset:   -1:000000000000
+  tag:         tip
+  user:        
+  date:        Thu Jan 01 00:00:00 1970 +0000
+  
   $ cd ..
 
 Make a new repo with git:
   $ mkdir foo
   $ cd foo
   $ git init
   Initialized empty Git repository in $TESTTMP/foo/.git/
 Ignore the .hg directory within git:
   $ echo .hg >> .git/info/exclude
   $ echo alpha > alpha
   $ git add alpha
   $ gitcommit -am 'Add alpha'
   $ echo beta > beta
   $ git add beta
   $ gitcommit -am 'Add beta'
   $ echo gamma > gamma
   $ git status
   On branch master
   Untracked files:
     (use "git add <file>..." to include in what will be committed)
    (?)
   	gamma
   
   nothing added to commit but untracked files present (use "git add" to track)
 
 Without creating the .hg, hg status fails:
   $ hg status
   abort: no repository found in '$TESTTMP/foo' (.hg not found)
   [10]
 But if you run hg init --git, it works:
   $ hg init --git
   $ hg id --traceback
   heads mismatch, rebuilding dagcache
   3d9be8deba43 tip master
   $ hg status
   ? gamma
 Log works too:
   $ hg log
   changeset:   1:3d9be8deba43
   bookmark:    master
   tag:         tip
   user:        test <[e-mail]>
   date:        Mon Jan 01 00:00:11 2007 +0000
   summary:     Add beta
   
   changeset:   0:c5864c9d16fb
   user:        test <[e-mail]>
   date:        Mon Jan 01 00:00:10 2007 +0000
   summary:     Add alpha
   
 
 
 and bookmarks:
   $ hg bookmarks
    * master                    1:3d9be8deba43
 
 diff even works transparently in both systems:
   $ echo blah >> alpha
   $ git diff
   diff --git a/alpha b/alpha
   index 4a58007..faed1b7 100644
   --- a/alpha
   +++ b/alpha
   @@ -1* +1,2 @@ (glob)
    alpha
   +blah
   $ hg diff --git
   diff --git a/alpha b/alpha
   --- a/alpha
   +++ b/alpha
   @@ -1,1 +1,2 @@
    alpha
   +blah
 
 Remove a file, it shows as such:
   $ rm alpha
   $ hg status
   ! alpha
   ? gamma
 
 Revert works:
   $ hg revert alpha --traceback
   $ hg status
   ? gamma
   $ git status
   On branch master
   Untracked files:
     (use "git add <file>..." to include in what will be committed)
    (?)
   	gamma
   
   nothing added to commit but untracked files present (use "git add" to track)
 
 Add shows sanely in both:
   $ hg add gamma
   $ hg status
   A gamma
   $ hg files
   alpha
   beta
   gamma
   $ git ls-files
   alpha
   beta
   gamma
   $ git status
   On branch master
   Changes to be committed:
     (use "git restore --staged <file>..." to unstage) (?)
     (use "git reset HEAD <file>..." to unstage) (?)
    (?)
   	new file:   gamma
   
 
 forget does what it should as well:
   $ hg forget gamma
   $ hg status
   ? gamma
   $ git status
   On branch master
   Untracked files:
     (use "git add <file>..." to include in what will be committed)
    (?)
   	gamma
   
   nothing added to commit but untracked files present (use "git add" to track)
 
 clean up untracked file
   $ rm gamma
 
 hg log FILE
 
   $ echo a >> alpha
   $ hg ci -m 'more alpha' --traceback --date '1583522787 18000'
   $ echo b >> beta
   $ hg ci -m 'more beta'
   heads mismatch, rebuilding dagcache
   $ echo a >> alpha
   $ hg ci -m 'even more alpha'
   heads mismatch, rebuilding dagcache
   $ hg log -G alpha
   heads mismatch, rebuilding dagcache
   @  changeset:   4:6626247b7dc8
   :  bookmark:    master
   :  tag:         tip
   :  user:        test <test>
   :  date:        Thu Jan 01 00:00:00 1970 +0000
   :  summary:     even more alpha
   :
   o  changeset:   2:a1983dd7fb19
   :  user:        test <test>
   :  date:        Fri Mar 06 14:26:27 2020 -0500
   :  summary:     more alpha
   :
   o  changeset:   0:c5864c9d16fb
      user:        test <[e-mail]>
      date:        Mon Jan 01 00:00:10 2007 +0000
      summary:     Add alpha
   
   $ hg log -G beta
   o  changeset:   3:d8ee22687733
   :  user:        test <test>
   :  date:        Thu Jan 01 00:00:00 1970 +0000
   :  summary:     more beta
   :
   o  changeset:   1:3d9be8deba43
   |  user:        test <[e-mail]>
   ~  date:        Mon Jan 01 00:00:11 2007 +0000
      summary:     Add beta
   
 
   $ hg log -r "children(3d9be8deba43)" -T"{node|short} {children}\n"
   a1983dd7fb19 3:d8ee22687733
 
 hg annotate
 
   $ hg annotate alpha
   0: alpha
   2: a
   4: a
   $ hg annotate beta
   1: beta
   3: b
 
 
 Files in subdirectories. TODO: case-folding support, make this `A`
 instead of `a`.
 
   $ mkdir a
   $ echo "This is file mu." > a/mu
   $ hg ci -A -m 'Introduce file a/mu'
   adding a/mu
 
 Both hg and git agree a/mu is part of the repo
 
   $ git ls-files
   a/mu
   alpha
   beta
   $ hg files
   a/mu
   alpha
   beta
 
 hg and git status both clean
 
   $ git status
   On branch master
   nothing to commit, working tree clean
   $ hg status
   heads mismatch, rebuilding dagcache
 
 
 node|shortest works correctly
   $ hg log -T '{node}\n' | sort
   3d9be8deba43482be2c81a4cb4be1f10d85fa8bc
   6626247b7dc8f231b183b8a4761c89139baca2ad
   a1983dd7fb19cbd83ad5a1c2fc8bf3d775dea12f
   ae1ab744f95bfd5b07cf573baef98a778058537b
   c5864c9d16fb3431fe2c175ff84dc6accdbb2c18
   d8ee22687733a1991813560b15128cd9734f4b48
   $ hg log -r ae1ab744f95bfd5b07cf573baef98a778058537b --template "{shortest(node,1)}\n"
   ae
 
 This covers gitlog._partialmatch()
   $ hg log -r a
   abort: ambiguous revision identifier: a
   [10]
   $ hg log -r a1
   changeset:   2:a1983dd7fb19
   user:        test <test>
   date:        Fri Mar 06 14:26:27 2020 -0500
   summary:     more alpha
   
   $ hg log -r dead
   abort: unknown revision 'dead'
   [255]
 
 This coveres changelog.findmissing()
   $ hg merge --preview 3d9be8deba43
 
 This covers manifest.diff()
   $ hg diff -c 3d9be8deba43
   diff -r c5864c9d16fb -r 3d9be8deba43 beta
   --- /dev/null	Thu Jan 01 00:00:00 1970 +0000
   +++ b/beta	Mon Jan 01 00:00:11 2007 +0000
   @@ -0,0 +1,1 @@
   +beta
 
 
 Interactive commit should work as expected
 
   $ echo bar >> alpha
   $ echo bar >> beta
   $ hg commit -m "test interactive commit" -i --config ui.interactive=true --config ui.interface=text << EOF
   > y
   > y
   > n
   > EOF
   diff --git a/alpha b/alpha
   1 hunks, 1 lines changed
   examine changes to 'alpha'?
   (enter ? for help) [Ynesfdaq?] y
   
   @@ -1,3 +1,4 @@
    alpha
    a
    a
   +bar
   record change 1/2 to 'alpha'?
   (enter ? for help) [Ynesfdaq?] y
   
   diff --git a/beta b/beta
   1 hunks, 1 lines changed
   examine changes to 'beta'?
   (enter ? for help) [Ynesfdaq?] n
   
 Status should be consistent for both systems
 
   $ hg status
   heads mismatch, rebuilding dagcache
   M beta
   $ git status | egrep -v '^$|^  \(use '
   On branch master
   Changes not staged for commit:
   	modified:   beta
   no changes added to commit (use "git add" and/or "git commit -a")
 
 Contents of each commit should be the same
 
   $ hg ex -r .
   # HG changeset patch
   # User test <test>
   # Date 0 0
   #      Thu Jan 01 00:00:00 1970 +0000
   # Node ID 80adc61cf57e99f6a412d83fee6239d1556cefcf
   # Parent  ae1ab744f95bfd5b07cf573baef98a778058537b
   test interactive commit
   
   diff -r ae1ab744f95b -r 80adc61cf57e alpha
   --- a/alpha	Thu Jan 01 00:00:00 1970 +0000
   +++ b/alpha	Thu Jan 01 00:00:00 1970 +0000
   @@ -1,3 +1,4 @@
    alpha
    a
    a
   +bar
   $ git show
   commit 80adc61cf57e99f6a412d83fee6239d1556cefcf
   Author: test <test>
   Date:   Thu Jan 1 00:00:00 1970 +0000
   
       test interactive commit
   
   diff --git a/alpha b/alpha
   index d112a75..d2a2e9a 100644
   --- a/alpha
   +++ b/alpha
   @@ -1,3 +1,4 @@
    alpha
    a
    a
   +bar
 
 Deleting files should also work (this was issue6398)
   $ hg revert -r . --all
   reverting beta
   $ hg rm beta
   $ hg ci -m 'remove beta'
 
 This covers changelog.tiprev() (issue6510)
   $ hg log -r '(.^^):'
   heads mismatch, rebuilding dagcache
   changeset:   5:ae1ab744f95b
   user:        test <test>
   date:        Thu Jan 01 00:00:00 1970 +0000
   summary:     Introduce file a/mu
   
   changeset:   6:80adc61cf57e
   user:        test <test>
   date:        Thu Jan 01 00:00:00 1970 +0000
   summary:     test interactive commit
   
   changeset:   7:116aee5ecdff
   bookmark:    master
   tag:         tip
   user:        test <test>
   date:        Thu Jan 01 00:00:00 1970 +0000
   summary:     remove beta
   
 This covers changelog.headrevs() with a non-None arg
 
 TODO: Fix the user name.  The stray > char also break `hg ci --amend`.
   $ hg log -r 'heads(.)' -Tcompact
   7[tip][master]   116aee5ecdff   1970-01-01 00:00 +0000   test>
     remove beta