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multi-pack-index: prepare for 'expire' subcommand

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The multi-pack-index tracks objects in a collection of pack-files.
Only one copy of each object is indexed, using the modified time
of the pack-files to determine tie-breakers. It is possible to
have a pack-file with no referenced objects because all objects
have a duplicate in a newer pack-file.

Introduce a new 'expire' subcommand to the multi-pack-index builtin.
This subcommand will delete these unused pack-files and rewrite the
multi-pack-index to no longer refer to those files. More details
about the specifics will follow as the method is implemented.

Add a test that verifies the 'expire' subcommand is correctly wired,
but will still be valid when the verb is implemented. Specifically,
create a set of packs that should all have referenced objects and
should not be removed during an 'expire' operation. The packs are
created carefully to ensure they have a specific order when sorted
by size. This will be important in a later test.

Signed-off-by: Derrick Stolee <dstolee@microsoft.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
This commit is contained in:
Derrick Stolee
2019-06-10 16:35:23 -07:00
committed by Junio C Hamano
parent 81efa16154
commit cff9711616
5 changed files with 63 additions and 1 deletions
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midx.h
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@@ -50,6 +50,7 @@ int prepare_multi_pack_index_one(struct repository *r, const char *object_dir, i
int write_midx_file(const char *object_dir);
void clear_midx_file(struct repository *r);
int verify_midx_file(struct repository *r, const char *object_dir);
int expire_midx_packs(struct repository *r, const char *object_dir);
void close_midx(struct multi_pack_index *m);