https://bz.mercurial-scm.org/show_bug.cgi?id=6648
Bug ID: 6648
Summary: list index out of range when running `hg evolve` on
obsolete commit with no successors
Product: Mercurial
Version: unspecified
Hardware: PC
OS: Linux
Status: UNCONFIRMED
Severity: bug
Priority: wish
Component: evolution
Assignee: bugzi...@mercurial-scm.org
Reporter: h...@pewpew.net
CC: mercurial-devel@mercurial-scm.org,
pierre-yves.da...@ens-lyon.org
Python Version: ---
If I create a chain of commits (let's call this revisions 0-1-2), split 1,
prune 2, and then update to 2 and try to run `hg evolve`, it crashes with `list
index out of range` as of change 431bf23d.
Reproduction steps:
```
$ hg init
$ echo hi > foo && hg commit -qAm 'r0'
$ echo -e "hi_r3\nhi_r4" >> foo && hg commit -qm 'r1_splitme'
$ echo bar > bar && hg commit -qAm 'r2_obsoleteme'
# This is just so that we don't have to use --hidden below.
$ hg tag --local -r 2 bar
$ hg prune -r 2
$ hg split
# Split r1_splitme into two revisions, whatever way you want
$ hg update -r 2 --hidden
2 files updated, 0 files merged, 0 files removed, 0 files unresolved
working directory parent is obsolete! (82259e31ec1f)
(use 'hg evolve' to update to its parent successor)
# When using evolve from 46858e6f (aka 431bf23d^)
$ hg evolve
parent is obsolete with multiple successors:
3 75ce52d1 "hi_r3"
4 749ae671 tip "hi_r4"
# When using evolve from 431bf23d
hg evolve --config extensions.evolve=
** unknown exception encountered, please report by visiting
** https://mercurial-scm.org/wiki/BugTracker
** Python 3.9.9 (main, Jan 12 2022, 16:10:51) [GCC 11.2.0]
** Mercurial Distributed SCM (version 6.0.2+hg355.02e9ad08999b)
** Extensions loaded: evolve 10.5.0.dev
Traceback (most recent call last):
File "/usr/lib/python3/dist-packages/hgext3rd/evolve/evolvecmd.py", line
1822, in solveobswdp
ctx = repo[utility._singlesuccessor(repo, oldctx)]
File "/usr/lib/python3/dist-packages/hgext3rd/evolve/utility.py", line 127,
in _singlesuccessor
raise MultipleSuccessorsError(newer)
hgext3rd.evolve.utility.MultipleSuccessorsError:
[[b'u\xceR\xd1\xe8#\xb7M\x16\x96YWZz\xb6\xfc*\xbfQ\xb9',
b't\x9a\xe6qM>\xcf\xab\x8b\x07\xabD\xfei\xfd=\x00\x1e\x9f\xb0']]
During handling of the above exception, another exception occurred:
Traceback (most recent call last):
File "/usr/bin/hg", line 61, in <module>
dispatch.run()
File "/usr/lib/python3/dist-packages/mercurial/dispatch.py", line 144, in run
status = dispatch(req)
File "/usr/lib/python3/dist-packages/mercurial/dispatch.py", line 250, in
dispatch
status = _rundispatch(req)
File "/usr/lib/python3/dist-packages/mercurial/dispatch.py", line 299, in
_rundispatch
ret = _runcatch(req) or 0
File "/usr/lib/python3/dist-packages/mercurial/dispatch.py", line 487, in
_runcatch
return _callcatch(ui, _runcatchfunc)
File "/usr/lib/python3/dist-packages/mercurial/dispatch.py", line 497, in
_callcatch
return scmutil.callcatch(ui, func)
File "/usr/lib/python3/dist-packages/mercurial/scmutil.py", line 153, in
callcatch
return func()
File "/usr/lib/python3/dist-packages/mercurial/dispatch.py", line 474, in
_runcatchfunc
return _dispatch(req)
File "/usr/lib/python3/dist-packages/mercurial/dispatch.py", line 1290, in
_dispatch
return runcommand(
File "/usr/lib/python3/dist-packages/mercurial/dispatch.py", line 935, in
runcommand
ret = _runcommand(ui, options, cmd, d)
File "/usr/lib/python3/dist-packages/mercurial/dispatch.py", line 1302, in
_runcommand
return cmdfunc()
File "/usr/lib/python3/dist-packages/mercurial/dispatch.py", line 1288, in
<lambda>
d = lambda: util.checksignature(func)(ui, *args, **strcmdopt)
File "/usr/lib/python3/dist-packages/mercurial/util.py", line 1887, in check
return func(*args, **kwargs)
File "/usr/lib/python3/dist-packages/hgext3rd/evolve/evolvecmd.py", line
1638, in evolve
return _performevolve(ui, repo, **opts)
File "/usr/lib/python3/dist-packages/hgext3rd/evolve/evolvecmd.py", line
1726, in _performevolve
result = solveobswdp(ui, repo, opts)
File "/usr/lib/python3/dist-packages/hgext3rd/evolve/evolvecmd.py", line
1825, in solveobswdp
splitsucc = utility.select_split_successor(ui, repo, oldctx)
File "/usr/lib/python3/dist-packages/hgext3rd/evolve/utility.py", line 139,
in select_split_successor
targets = obsutil.successorssets(repo, ctx.node())[0]
IndexError: list index out of range
```
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