( )⚙ D12087 unamend: error out when running on merge commit

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Differential D12087

unamend: error out when running on merge commit
ClosedPublic

Authored by martinvonz on Jan 25 2022, 12:17 AM.

Details

Reviewers
Alphare
Group Reviewers
hg-reviewers
Commits
rHG4f01821fa0ec: unamend: error out when running on merge commit
Summary

It's better to error out than to produce a bad commit. We do that same
in hg uncommit. I haven't looked into how much work it is to make
them work instead.

Diff Detail

Repository
rHG Mercurial
Lint
Automatic diff as part of commit; lint not applicable.
Unit
Automatic diff as part of commit; unit tests not applicable.

Event Timeline

martinvonz created this revision.Jan 25 2022, 12:17 AM
Alphare accepted this revision.Jan 25 2022, 4:49 AM
Alphare added a subscriber: Alphare.

Agreed that this is strictly better. I'll queue both for stable

This revision is now accepted and ready to land.Jan 25 2022, 4:49 AM
martinvonz added a commit: rHG4f01821fa0ec: unamend: error out when running on merge commit.Jan 25 2022, 4:53 AM
Closed by commit rHG4f01821fa0ec: unamend: error out when running on merge commit (authored by martinvonz). · Explain Why
This revision was automatically updated to reflect the committed changes.

Revision Contents
Changeset List

PathPackages
Mhgext/uncommit.py (2 lines)
Mtests/test-unamend.t (7 lines)

Diff 31978

hgext/uncommit.py

unfi = repo.unfiltered() unfi = repo.unfiltered()
with repo.wlock(), repo.lock(), repo.transaction(b'unamend'): with repo.wlock(), repo.lock(), repo.transaction(b'unamend'):
# identify the commit from which to unamend # identify the commit from which to unamend
curctx = repo[b'.'] curctx = repo[b'.']
rewriteutil.precheck(repo, [curctx.rev()], b'unamend') rewriteutil.precheck(repo, [curctx.rev()], b'unamend')
if len(curctx.parents()) > 1:
raise error.InputError(_(b"cannot unamend merge changeset"))
# identify the commit to which to unamend # identify the commit to which to unamend
markers = list(predecessormarkers(curctx)) markers = list(predecessormarkers(curctx))
if len(markers) != 1: if len(markers) != 1:
e = _(b"changeset must have one predecessor, found %i predecessors") e = _(b"changeset must have one predecessor, found %i predecessors")
raise error.InputError(e % len(markers)) raise error.InputError(e % len(markers))
prednode = markers[0].prednode() prednode = markers[0].prednode()

tests/test-unamend.t

$ hg ci -m merge $ hg ci -m merge
$ echo accidental > initial $ echo accidental > initial
$ hg st --rev 1 --rev . $ hg st --rev 1 --rev .
A right A right
$ hg st --rev 2 --rev . $ hg st --rev 2 --rev .
A left A left
$ hg amend $ hg amend
$ hg unamend $ hg unamend
$ hg st --rev 1 --rev . abort: cannot unamend merge changeset
A right [10]
R left (known-bad-output !)
$ hg st --rev 2 --rev .
A left (missing-correct-output !)