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t5510-fetch.sh: demonstrate fetch.writeCommitGraph bug

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While dogfooding, Johannes found a bug in the fetch.writeCommitGraph
config behavior. His example initially happened during a clone with
--recurse-submodules, we found that this happens with the first fetch
after cloning a repository that contains a submodule:

	$ git clone <url> test
	$ cd test
	$ git -c fetch.writeCommitGraph=true fetch origin
	Computing commit graph generation numbers: 100% (12/12), done.
	BUG: commit-graph.c:886: missing parent <hash1> for commit <hash2>
	Aborted (core dumped)

In the repo I had cloned, there were really 60 commits to scan, but
only 12 were in the list to write when calling
compute_generation_numbers(). A commit in the list expects to see a
parent, but that parent is not in the list.

A follow-up will fix the bug, but first we create a test that
demonstrates the problem. This test must be careful about an existing
commit-graph file, since GIT_TEST_COMMIT_GRAPH=1 will cause the repo we
are cloning to already have one. This then prevents the incremtnal
commit-graph write during the first 'git fetch'.

Helped-by: Jeff King <peff@peff.net>
Helped-by: Johannes Schindelin <johannes.schindelin@gmx.de>
Helped-by: Szeder Gábor <szeder.dev@gmail.com>
Signed-off-by: Derrick Stolee <dstolee@microsoft.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
This commit is contained in:
Derrick Stolee 2019-10-24 13:40:41 +00:00 committed by Junio C Hamano
parent 50f26bd035
commit e88aab917e
1 changed files with 16 additions and 0 deletions
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16
t/t5510-fetch.sh
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@ -583,6 +583,22 @@ test_expect_success 'fetch.writeCommitGraph' '
)
'
test_expect_failure 'fetch.writeCommitGraph with submodules' '
git clone dups super &&
(
cd super &&
git submodule add "file://$TRASH_DIRECTORY/three" &&
git commit -m "add submodule"
) &&
git clone "super" super-clone &&
(
cd super-clone &&
rm -rf .git/objects/info &&
git -c fetch.writeCommitGraph=true fetch origin &&
test_path_is_file .git/objects/info/commit-graphs/commit-graph-chain
)
'
# configured prune tests
set_config_tristate () {