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pretty: add abbrev option to %(describe)

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The %(describe) placeholder by default, like `git describe`, uses a
seven-character abbreviated commit object name. This may not be
sufficient to fully describe all commits in a given repository,
resulting in a placeholder replacement changing its length because the
repository grew in size.  This could cause the output of git-archive to
change.

Add the --abbrev option to `git describe` to the placeholder interface
in order to provide tools to the user for fine-tuning project defaults
and ensure reproducible archives.

One alternative would be to just always specify --abbrev=40 but this may
be a bit too biased...

Signed-off-by: Eli Schwartz <eschwartz@archlinux.org>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
This commit is contained in:
Eli Schwartz
2021-10-31 13:15:10 -04:00
committed by Junio C Hamano
parent 1d517ceab9
commit eccd97d0b0
3 changed files with 27 additions and 0 deletions
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8
t/t4205-log-pretty-formats.sh
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@ -1010,4 +1010,12 @@ test_expect_success '%(describe:tags) vs git describe --tags' '
test_cmp expect actual
'
test_expect_success '%(describe:abbrev=...) vs git describe --abbrev=...' '
test_when_finished "git tag -d tagname" &&
git tag -a -m tagged tagname &&
git describe --abbrev=15 >expect &&
git log -1 --format="%(describe:abbrev=15)" >actual &&
test_cmp expect actual
'
test_done