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Re: [PATCH] t5310-pack-bitmaps: make JGit tests work with GIT_TEST_SPLIT_INDEX

On Thu, May 10, 2018 at 03:58:52PM +0200, SZEDER Gábor wrote:

> The two JGit tests 'we can read jgit bitmaps' and 'jgit can read our
> bitmaps' in 't5310-pack-bitmaps.sh' fail when run with
> GIT_TEST_SPLIT_INDEX=YesPlease.  Both tests create a clone of the test
> repository to check bitmap interoperability with JGit.  With split
> indexes enabled the index in the clone repositories contains the
> 'link' extension, which JGit doesn't support and, consequently, an
> exception aborts it:
>   <...>
>   org.eclipse.jgit.api.errors.JGitInternalException: DIRC extension 'link' not supported by this version.
>           at org.eclipse.jgit.dircache.DirCache.readFrom(DirCache.java:562)
>   <...>
> Since testing bitmaps doesn't need a worktree in the first place,
> let's just create bare clones for the two JGit tests, so the cloned
> won't have an index, and these two tests can be executed even with
> split index enabled.

Nice, this seems like a clever workaround.

Reviewed-by: Jeff King <peff@xxxxxxxx>

The more heavy-handed approach would be to just disable the JGIT prereq
when GIT_TEST_SPLIT_INDEX is in use, which would cover this and
potentially any other cases. This is nicer because it lets us continue
using the test. And it's not like we have a ton of jgit dependencies,
such that dealing with each individually would be a burden.