midx: add test that 'expire' respects .keep files

The 'git multi-pack-index expire' subcommand may delete packs that
are not needed from the perspective of the multi-pack-index. If
a pack has a .keep file, then we should not delete that pack. Add
a test that ensures we preserve a pack that would otherwise be
expired. First, create a new pack that contains every object in
the repo, then add it to the multi-pack-index. Then create a .keep
file for a pack starting with "a-pack" that was added in the
previous test. Finally, expire and verify that the pack remains
and the other packs were expired.

Signed-off-by: Derrick Stolee <dstolee@microsoft.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

diff --git a/t/t5319-multi-pack-index.sh b/t/t5319-multi-pack-index.sh
index 8e04ce2821dbd666b07811cbc39b52165e90082b..c2889014010bc6a7b12b1f33a7769e7f1b0c59f4 100755 (executable)
--- a/t/t5319-multi-pack-index.sh
+++ b/t/t5319-multi-pack-index.sh
@@ -510,4 +510,22 @@ test_expect_success 'expire works when adding new packs' '
        )
 '
 
+test_expect_success 'expire respects .keep files' '
+       (
+               cd dup &&
+               git pack-objects --revs .git/objects/pack/pack-all <<-EOF &&
+               refs/heads/A
+               EOF
+               git multi-pack-index write &&
+               PACKA=$(ls .git/objects/pack/a-pack*\.pack | sed s/\.pack\$//) &&
+               touch $PACKA.keep &&
+               git multi-pack-index expire &&
+               ls -S .git/objects/pack/a-pack* | grep $PACKA >a-pack-files &&
+               test_line_count = 3 a-pack-files &&
+               test-tool read-midx .git/objects | grep idx >midx-list &&
+               test_line_count = 2 midx-list
+       )
+'
+
+
 test_done