clone: test for our behavior on odd objects/* content

Add tests for what happens when we perform a local clone on a repo
containing odd files at .git/object directory, such as symlinks to other
dirs, or unknown files.

I'm bending over backwards here to avoid a SHA-1 dependency. See [1]
for an earlier and simpler version that hardcoded SHA-1s.

This behavior has been the same for a *long* time, but hasn't been
tested for.

There's a good post-hoc argument to be made for copying over unknown
things, e.g. I'd like a git version that doesn't know about the
commit-graph to copy it under "clone --local" so a newer git version
can make use of it.

In follow-up commits we'll look at changing some of this behavior, but
for now, let's just assert it as-is so we'll notice what we'll change
later.

1. https://public-inbox.org/git/20190226002625.13022-5-avarab@gmail.com/

Signed-off-by: Ævar Arnfjörð Bjarmason <avarab@gmail.com>
[matheus.bernardino: improved and split tests in more than one patch]
Helped-by: Matheus Tavares <matheus.bernardino@usp.br>
Signed-off-by: Matheus Tavares <matheus.bernardino@usp.br>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

diff --git a/t/t5604-clone-reference.sh b/t/t5604-clone-reference.sh
index 4320082b1b8fe709e9462f84d15fec63c54a94d4..11250cab40ad4573b46b1584df413cb4c5e7b357 100755 (executable)
--- a/t/t5604-clone-reference.sh
+++ b/t/t5604-clone-reference.sh
@@ -221,4 +221,115 @@ test_expect_success 'clone, dissociate from alternates' '
        ( cd C && git fsck )
 '
 
+test_expect_success 'setup repo with garbage in objects/*' '
+       git init S &&
+       (
+               cd S &&
+               test_commit A &&
+
+               cd .git/objects &&
+               >.some-hidden-file &&
+               >some-file &&
+               mkdir .some-hidden-dir &&
+               >.some-hidden-dir/some-file &&
+               >.some-hidden-dir/.some-dot-file &&
+               mkdir some-dir &&
+               >some-dir/some-file &&
+               >some-dir/.some-dot-file
+       )
+'
+
+test_expect_success 'clone a repo with garbage in objects/*' '
+       for option in --local --no-hardlinks --shared --dissociate
+       do
+               git clone $option S S$option || return 1 &&
+               git -C S$option fsck || return 1
+       done &&
+       find S-* -name "*some*" | sort >actual &&
+       cat >expected <<-EOF &&
+       S--dissociate/.git/objects/.some-hidden-file
+       S--dissociate/.git/objects/some-dir
+       S--dissociate/.git/objects/some-dir/.some-dot-file
+       S--dissociate/.git/objects/some-dir/some-file
+       S--dissociate/.git/objects/some-file
+       S--local/.git/objects/.some-hidden-file
+       S--local/.git/objects/some-dir
+       S--local/.git/objects/some-dir/.some-dot-file
+       S--local/.git/objects/some-dir/some-file
+       S--local/.git/objects/some-file
+       S--no-hardlinks/.git/objects/.some-hidden-file
+       S--no-hardlinks/.git/objects/some-dir
+       S--no-hardlinks/.git/objects/some-dir/.some-dot-file
+       S--no-hardlinks/.git/objects/some-dir/some-file
+       S--no-hardlinks/.git/objects/some-file
+       EOF
+       test_cmp expected actual
+'
+
+test_expect_success SYMLINKS 'setup repo with manually symlinked dirs and unknown files at objects/' '
+       git init T &&
+       (
+               cd T &&
+               git config gc.auto 0 &&
+               test_commit A &&
+               git gc &&
+               test_commit B &&
+
+               cd .git/objects &&
+               mv pack packs &&
+               ln -s packs pack &&
+               find ?? -type d >loose-dirs &&
+               last_loose=$(tail -n 1 loose-dirs) &&
+               rm -f loose-dirs &&
+               mv $last_loose a-loose-dir &&
+               ln -s a-loose-dir $last_loose &&
+               find . -type f | sort >../../../T.objects-files.raw &&
+               echo unknown_content >unknown_file
+       ) &&
+       git -C T fsck &&
+       git -C T rev-list --all --objects >T.objects
+'
+
+
+test_expect_success SYMLINKS 'clone repo with symlinked dirs and unknown files at objects/' '
+       for option in --local --no-hardlinks --shared --dissociate
+       do
+               git clone $option T T$option || return 1 &&
+               git -C T$option fsck || return 1 &&
+               git -C T$option rev-list --all --objects >T$option.objects &&
+               test_cmp T.objects T$option.objects &&
+               (
+                       cd T$option/.git/objects &&
+                       find . -type f | sort >../../../T$option.objects-files.raw
+               )
+       done &&
+
+       for raw in $(ls T*.raw)
+       do
+               sed -e "s!/../!/Y/!; s![0-9a-f]\{38,\}!Z!" -e "/commit-graph/d" \
+                   -e "/multi-pack-index/d" <$raw >$raw.de-sha || return 1
+       done &&
+
+       cat >expected-files <<-EOF &&
+       ./Y/Z
+       ./Y/Z
+       ./a-loose-dir/Z
+       ./Y/Z
+       ./info/packs
+       ./pack/pack-Z.idx
+       ./pack/pack-Z.pack
+       ./packs/pack-Z.idx
+       ./packs/pack-Z.pack
+       ./unknown_file
+       EOF
+
+       for option in --local --dissociate --no-hardlinks
+       do
+               test_cmp expected-files T$option.objects-files.raw.de-sha || return 1
+       done &&
+
+       echo ./info/alternates >expected-files &&
+       test_cmp expected-files T--shared.objects-files.raw
+'
+
 test_done