On Tue, Aug 14, 2018 at 01:47:21PM +0200, SZEDER Gábor wrote:
> The test 'pack-objects to file can use bitmap' added in 645c432d61
> (pack-objects: use reachability bitmap index when generating
> non-stdout pack, 2016-09-10) is silently buggy and doesn't check what
> it's supposed to.
>
> In 't5310-pack-bitmaps.sh', the 'list_packed_objects' helper function
> does what its name implies by running:
>
> git show-index <"$1" | cut -d' ' -f2
>
> The test in question invokes this function like this:
>
> list_packed_objects <packa-$packasha1.idx >packa.objects &&
> list_packed_objects <packb-$packbsha1.idx >packb.objects &&
> test_cmp packa.objects packb.objects
>
> Note how these two callsites don't specify the name of the pack index
> file as the function's parameter, but redirect the function's standard
> input from it. This triggers an error message from the shell, as it
> has no filename to redirect from in the function, but this error is
> ignored, because it happens upstream of a pipe. Consequently, both
> invocations produce empty 'pack{a,b}.objects' files, and the
> subsequent 'test_cmp' happily finds those two empty files identical.
>
> Fix these two 'list_packed_objects' invocations by specifying the pack
> index files as parameters. Furthermore, eliminate the pipe in that
> function by replacing it with an &&-chained pair of commands using an
> intermediate file, so a failure of 'git show-index' or the shell
> redirection will fail the test.
Good catch, and nicely explained. The patch itself looks obviously
correct.
-Peff
