[Bug 6500] New: KeyError in hg fold

[mercurial-bugs at mercurial-scm.org]

https://bz.mercurial-scm.org/show_bug.cgi?id=6500

            Bug ID: 6500
           Summary: KeyError in hg fold
           Product: Mercurial
           Version: 5.7
          Hardware: PC
                OS: Linux
            Status: UNCONFIRMED
          Severity: bug
          Priority: normal
         Component: evolution
          Assignee: bugzilla at mercurial-scm.org
          Reporter: zash at zash.se
                CC: mercurial-devel at mercurial-scm.org,
                    pierre-yves.david at ens-lyon.org
    Python Version: 3.7

Not quite sure how I got here, but tip is an almost empty commit that adds a
blank line for some reason.
It may have been created when attempting to fold pair of commits via histedit,
which somehow ended up creating some left-over temporary commit, and also this
duplicate commit.
Wasn't able to reproduce this in a smaller repo so I'm just dropping the
traceback here in the hopes that it makes sense to someone.


@  1d3e   tip no-topic
| o  5701   topic
|/
o  f15d   topic



$ hg fold -r .+.^ --exact
transaction abort!
rollback completed
** unknown exception encountered, please report by visiting
** https://mercurial-scm.org/wiki/BugTracker
** Python 3.7.3 (default, Jul 25 2020, 13:03:44) [GCC 8.3.0]
** Mercurial Distributed SCM (version 5.7)
** Extensions loaded: absorb, evolve 10.2.0, extdiff, fastannotate, fix,
githelp, histedit, patchbomb, purge, rebase, releasenotes, relink, schemes,
show, topic 0.21.0, transplant
Traceback (most recent call last):
  File "/usr/lib/python3/dist-packages/mercurial/commandserver.py", line 499,
in _serverequest
    sv.serve()
  File "/usr/lib/python3/dist-packages/mercurial/commandserver.py", line 403,
in serve
    while self.serveone():
  File "/usr/lib/python3/dist-packages/mercurial/commandserver.py", line 377,
in serveone
    handler(self)
  File "/usr/lib/python3/dist-packages/mercurial/chgserver.py", line 585, in
runcommand
    return super(chgcmdserver, self).runcommand()
  File "/usr/lib/python3/dist-packages/mercurial/commandserver.py", line 358,
in runcommand
    ret = self._dispatchcommand(req) & 255
  File "/usr/lib/python3/dist-packages/mercurial/commandserver.py", line 297,
in _dispatchcommand
    return dispatch.dispatch(req)
  File "/usr/lib/python3/dist-packages/mercurial/dispatch.py", line 245, in
dispatch
    status = _rundispatch(req)
  File "/usr/lib/python3/dist-packages/mercurial/dispatch.py", line 289, in
_rundispatch
    ret = _runcatch(req) or 0
  File "/usr/lib/python3/dist-packages/mercurial/dispatch.py", line 465, in
_runcatch
    return _callcatch(ui, _runcatchfunc)
  File "/usr/lib/python3/dist-packages/mercurial/dispatch.py", line 475, in
_callcatch
    return scmutil.callcatch(ui, func)
  File "/usr/lib/python3/dist-packages/mercurial/scmutil.py", line 155, in
callcatch
    return func()
  File "/usr/lib/python3/dist-packages/mercurial/dispatch.py", line 455, in
_runcatchfunc
    return _dispatch(req)
  File "/usr/lib/python3/dist-packages/mercurial/dispatch.py", line 1259, in
_dispatch
    lui, repo, cmd, fullargs, ui, options, d, cmdpats, cmdoptions
  File "/usr/lib/python3/dist-packages/mercurial/dispatch.py", line 913, in
runcommand
    ret = _runcommand(ui, options, cmd, d)
  File "/usr/lib/python3/dist-packages/mercurial/dispatch.py", line 1270, in
_runcommand
    return cmdfunc()
  File "/usr/lib/python3/dist-packages/mercurial/dispatch.py", line 1256, in
<lambda>
    d = lambda: util.checksignature(func)(ui, *args, **strcmdopt)
  File "/usr/lib/python3/dist-packages/mercurial/util.py", line 1867, in check
    return func(*args, **kwargs)
  File "/usr/lib/python3/dist-packages/hgext3rd/evolve/cmdrewrite.py", line
745, in fold
    commitopts=commitopts)
  File "/usr/lib/python3/dist-packages/hgext3rd/evolve/rewriteutil.py", line
279, in rewrite
    newid = repo.commitctx(new)
  File "/usr/lib/python3/dist-packages/hgext3rd/topic/__init__.py", line 502,
in commitctx
    del ctx.extra()[constants.extrakey]
KeyError: b'topic'

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