| commit | 24ba8b70c9965ea40fc1192cf17cd09394cb8350 | [log] [tgz] |
|---|---|---|
| author | Elijah Newren <newren@gmail.com> | Sat Jul 23 01:53:12 2022 +0000 |
| committer | Junio C Hamano <gitster@pobox.com> | Fri Jul 22 21:45:22 2022 -0700 |
| tree | ca60fcda995150a2452b4680136cac83e4a4f57b | |
| parent | 11f4290001989fcd071e59382be0574a87be68fe [diff] |
merge-resolve: abort if index does not match HEAD
As noted in commit 9822175d2b ("Ensure index matches head before
invoking merge machinery, round N", 2019-08-17), we have had a very
long history of problems with failing to enforce the requirement that
index matches HEAD when starting a merge. One of the commits
referenced in the long tale of issues arising from lax enforcement of
this requirement was commit 55f39cf755 ("merge: fix misleading
pre-merge check documentation", 2018-06-30), which tried to document
the requirement and noted there were some exceptions. As mentioned in
that commit message, the `resolve` strategy was the one strategy that
did not have an explicit index matching HEAD check, and the reason it
didn't was that I wasn't able to discover any cases where the
implementation would fail to catch the problem and abort, and didn't
want to introduce unnecessary performance overhead of adding another
check.
Well, today I discovered a testcase where the implementation does not
catch the problem and so an explicit check is needed. Add a testcase
that previously would have failed, and update git-merge-resolve.sh to
have an explicit check. Note that the code is copied from 3ec62ad9ff
("merge-octopus: abort if index does not match HEAD", 2016-04-09), so
that we reuse the same message and avoid making translators need to
translate some new message.
Signed-off-by: Elijah Newren <newren@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
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