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>
verify::
Verify the contents of the MIDX file.
+expire::
+ Delete the pack-files that are tracked by the MIDX file, but
+ have no objects referenced by the MIDX. Rewrite the MIDX file
+ afterward to remove all references to these pack-files.
+
EXAMPLES
--------
#include "trace2.h"
static char const * const builtin_multi_pack_index_usage[] = {
- N_("git multi-pack-index [--object-dir=<dir>] (write|verify)"),
+ N_("git multi-pack-index [--object-dir=<dir>] (write|verify|expire)"),
NULL
};
return write_midx_file(opts.object_dir);
if (!strcmp(argv[0], "verify"))
return verify_midx_file(the_repository, opts.object_dir);
+ if (!strcmp(argv[0], "expire"))
+ return expire_midx_packs(the_repository, opts.object_dir);
die(_("unrecognized verb: %s"), argv[0]);
}
return verify_midx_error;
}
+
+int expire_midx_packs(struct repository *r, const char *object_dir)
+{
+ return 0;
+}
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);
"incorrect object offset"
'
+test_expect_success 'setup expire tests' '
+ mkdir dup &&
+ (
+ cd dup &&
+ git init &&
+ test-tool genrandom "data" 4096 >large_file.txt &&
+ git update-index --add large_file.txt &&
+ for i in $(test_seq 1 20)
+ do
+ test_commit $i
+ done &&
+ git branch A HEAD &&
+ git branch B HEAD~8 &&
+ git branch C HEAD~13 &&
+ git branch D HEAD~16 &&
+ git branch E HEAD~18 &&
+ git pack-objects --revs .git/objects/pack/pack-A <<-EOF &&
+ refs/heads/A
+ ^refs/heads/B
+ EOF
+ git pack-objects --revs .git/objects/pack/pack-B <<-EOF &&
+ refs/heads/B
+ ^refs/heads/C
+ EOF
+ git pack-objects --revs .git/objects/pack/pack-C <<-EOF &&
+ refs/heads/C
+ ^refs/heads/D
+ EOF
+ git pack-objects --revs .git/objects/pack/pack-D <<-EOF &&
+ refs/heads/D
+ ^refs/heads/E
+ EOF
+ git pack-objects --revs .git/objects/pack/pack-E <<-EOF &&
+ refs/heads/E
+ EOF
+ git multi-pack-index write
+ )
+'
+
+test_expect_success 'expire does not remove any packs' '
+ (
+ cd dup &&
+ ls .git/objects/pack >expect &&
+ git multi-pack-index expire &&
+ ls .git/objects/pack >actual &&
+ test_cmp expect actual
+ )
+'
+
test_done