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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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5
Documentation/git-multi-pack-index.txt
View file

@ -31,6 +31,11 @@ write::
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
--------

4
builtin/multi-pack-index.c
View file

@ -6,7 +6,7 @@
#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
};
@ -47,6 +47,8 @@ int cmd_multi_pack_index(int argc, const char **argv,
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]);
}

5
midx.c
View file

@ -1140,3 +1140,8 @@ int verify_midx_file(struct repository *r, const char *object_dir)
return verify_midx_error;
}
int expire_midx_packs(struct repository *r, const char *object_dir)
{
return 0;
}

1
midx.h
View file

@ -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);

49
t/t5319-multi-pack-index.sh
View file

@ -363,4 +363,53 @@ test_expect_success 'verify incorrect 64-bit offset' '
"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