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branch tests: test for errno propagating on failing read

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Add a test for "git branch" to cover the case where .git/refs is
symlinked. To check availability, refs_verify_refname_available() will
run refs_read_raw_ref() on each prefix, leading to a read() from
.git/refs (which is a directory).

It would probably be more robust to re-issue the lstat() as a normal
stat(), in which case, we would fall back to the directory case, but
for now let's just test for the existing behavior as-is. This test
covers a regression in a commit that only ever made it to "next", see
[1].

1. http://lore.kernel.org/git/pull.1068.git.git.1629203489546.gitgitgadget@gmail.com

Signed-off-by: Han-Wen Nienhuys <hanwen@google.com>
Signed-off-by: Ævar Arnfjörð Bjarmason <avarab@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
This commit is contained in:
Han-Wen Nienhuys 2021-10-16 11:39:07 +02:00 committed by Junio C Hamano
parent f443b226ca
commit aa30fe1481
1 changed files with 22 additions and 0 deletions
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22
t/t3200-branch.sh
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@ -731,6 +731,28 @@ test_expect_success SYMLINKS 'git branch -m u v should fail when the reflog for
test_must_fail git branch -m u v
'
test_expect_success SYMLINKS 'git branch -m with symlinked .git/refs' '
test_when_finished "rm -rf subdir" &&
git init --bare subdir &&
rm -rfv subdir/refs subdir/objects subdir/packed-refs &&
ln -s ../.git/refs subdir/refs &&
ln -s ../.git/objects subdir/objects &&
ln -s ../.git/packed-refs subdir/packed-refs &&
git -C subdir rev-parse --absolute-git-dir >subdir.dir &&
git rev-parse --absolute-git-dir >our.dir &&
! test_cmp subdir.dir our.dir &&
git -C subdir log &&
git -C subdir branch rename-src &&
git rev-parse rename-src >expect &&
git -C subdir branch -m rename-src rename-dest &&
git rev-parse rename-dest >actual &&
test_cmp expect actual &&
git branch -D rename-dest
'
test_expect_success 'test tracking setup via --track' '
git config remote.local.url . &&
git config remote.local.fetch refs/heads/*:refs/remotes/local/* &&