mirror of
https://github.com/git/git
synced 2024-08-25 02:35:46 +00:00
multi-pack-index: implement 'expire' subcommand
The 'git multi-pack-index expire' subcommand looks at the existing mult-pack-index, counts the number of objects referenced in each pack-file, deletes the pack-fils with no referenced objects, and rewrites the multi-pack-index to no longer reference those packs. Refactor the write_midx_file() method to call write_midx_internal() which now takes an existing 'struct multi_pack_index' and a list of pack-files to drop (as specified by the names of their pack- indexes). As we write the new multi-pack-index, we drop those file names from the list of known pack-files. The expire_midx_packs() method removes the unreferenced pack-files after carefully closing the packs to avoid open handles. Test that a new pack-file that covers the contents of two other pack-files leads to those pack-files being deleted during the expire subcommand. Be sure to read the multi-pack-index to ensure it no longer references those packs. Signed-off-by: Derrick Stolee <dstolee@microsoft.com> Signed-off-by: Junio C Hamano <gitster@pobox.com>
This commit is contained in:
parent
d01bf2e609
commit
19575c7c8e
119
midx.c
119
midx.c
|
@ -34,6 +34,8 @@
|
|||
#define MIDX_CHUNK_LARGE_OFFSET_WIDTH (sizeof(uint64_t))
|
||||
#define MIDX_LARGE_OFFSET_NEEDED 0x80000000
|
||||
|
||||
#define PACK_EXPIRED UINT_MAX
|
||||
|
||||
static char *get_midx_filename(const char *object_dir)
|
||||
{
|
||||
return xstrfmt("%s/pack/multi-pack-index", object_dir);
|
||||
|
@ -431,6 +433,7 @@ struct pack_info {
|
|||
uint32_t orig_pack_int_id;
|
||||
char *pack_name;
|
||||
struct packed_git *p;
|
||||
unsigned expired : 1;
|
||||
};
|
||||
|
||||
static int pack_info_compare(const void *_a, const void *_b)
|
||||
|
@ -478,6 +481,7 @@ static void add_pack_to_midx(const char *full_path, size_t full_path_len,
|
|||
|
||||
packs->info[packs->nr].pack_name = xstrdup(file_name);
|
||||
packs->info[packs->nr].orig_pack_int_id = packs->nr;
|
||||
packs->info[packs->nr].expired = 0;
|
||||
packs->nr++;
|
||||
}
|
||||
}
|
||||
|
@ -637,13 +641,17 @@ static size_t write_midx_pack_names(struct hashfile *f,
|
|||
size_t written = 0;
|
||||
|
||||
for (i = 0; i < num_packs; i++) {
|
||||
size_t writelen = strlen(info[i].pack_name) + 1;
|
||||
size_t writelen;
|
||||
|
||||
if (info[i].expired)
|
||||
continue;
|
||||
|
||||
if (i && strcmp(info[i].pack_name, info[i - 1].pack_name) <= 0)
|
||||
BUG("incorrect pack-file order: %s before %s",
|
||||
info[i - 1].pack_name,
|
||||
info[i].pack_name);
|
||||
|
||||
writelen = strlen(info[i].pack_name) + 1;
|
||||
hashwrite(f, info[i].pack_name, writelen);
|
||||
written += writelen;
|
||||
}
|
||||
|
@ -725,6 +733,11 @@ static size_t write_midx_object_offsets(struct hashfile *f, int large_offset_nee
|
|||
for (i = 0; i < nr_objects; i++) {
|
||||
struct pack_midx_entry *obj = list++;
|
||||
|
||||
if (perm[obj->pack_int_id] == PACK_EXPIRED)
|
||||
BUG("object %s is in an expired pack with int-id %d",
|
||||
oid_to_hex(&obj->oid),
|
||||
obj->pack_int_id);
|
||||
|
||||
hashwrite_be32(f, perm[obj->pack_int_id]);
|
||||
|
||||
if (large_offset_needed && obj->offset >> 31)
|
||||
|
@ -771,7 +784,8 @@ static size_t write_midx_large_offsets(struct hashfile *f, uint32_t nr_large_off
|
|||
return written;
|
||||
}
|
||||
|
||||
int write_midx_file(const char *object_dir)
|
||||
static int write_midx_internal(const char *object_dir, struct multi_pack_index *m,
|
||||
struct string_list *packs_to_drop)
|
||||
{
|
||||
unsigned char cur_chunk, num_chunks = 0;
|
||||
char *midx_name;
|
||||
|
@ -787,6 +801,8 @@ int write_midx_file(const char *object_dir)
|
|||
struct pack_midx_entry *entries = NULL;
|
||||
int large_offsets_needed = 0;
|
||||
int pack_name_concat_len = 0;
|
||||
int dropped_packs = 0;
|
||||
int result = 0;
|
||||
|
||||
midx_name = get_midx_filename(object_dir);
|
||||
if (safe_create_leading_directories(midx_name)) {
|
||||
|
@ -795,7 +811,10 @@ int write_midx_file(const char *object_dir)
|
|||
midx_name);
|
||||
}
|
||||
|
||||
packs.m = load_multi_pack_index(object_dir, 1);
|
||||
if (m)
|
||||
packs.m = m;
|
||||
else
|
||||
packs.m = load_multi_pack_index(object_dir, 1);
|
||||
|
||||
packs.nr = 0;
|
||||
packs.alloc = packs.m ? packs.m->num_packs : 16;
|
||||
|
@ -809,13 +828,14 @@ int write_midx_file(const char *object_dir)
|
|||
packs.info[packs.nr].orig_pack_int_id = i;
|
||||
packs.info[packs.nr].pack_name = xstrdup(packs.m->pack_names[i]);
|
||||
packs.info[packs.nr].p = NULL;
|
||||
packs.info[packs.nr].expired = 0;
|
||||
packs.nr++;
|
||||
}
|
||||
}
|
||||
|
||||
for_each_file_in_pack_dir(object_dir, add_pack_to_midx, &packs);
|
||||
|
||||
if (packs.m && packs.nr == packs.m->num_packs)
|
||||
if (packs.m && packs.nr == packs.m->num_packs && !packs_to_drop)
|
||||
goto cleanup;
|
||||
|
||||
entries = get_sorted_entries(packs.m, packs.info, packs.nr, &nr_entries);
|
||||
|
@ -829,6 +849,34 @@ int write_midx_file(const char *object_dir)
|
|||
|
||||
QSORT(packs.info, packs.nr, pack_info_compare);
|
||||
|
||||
if (packs_to_drop && packs_to_drop->nr) {
|
||||
int drop_index = 0;
|
||||
int missing_drops = 0;
|
||||
|
||||
for (i = 0; i < packs.nr && drop_index < packs_to_drop->nr; i++) {
|
||||
int cmp = strcmp(packs.info[i].pack_name,
|
||||
packs_to_drop->items[drop_index].string);
|
||||
|
||||
if (!cmp) {
|
||||
drop_index++;
|
||||
packs.info[i].expired = 1;
|
||||
} else if (cmp > 0) {
|
||||
error(_("did not see pack-file %s to drop"),
|
||||
packs_to_drop->items[drop_index].string);
|
||||
drop_index++;
|
||||
missing_drops++;
|
||||
i--;
|
||||
} else {
|
||||
packs.info[i].expired = 0;
|
||||
}
|
||||
}
|
||||
|
||||
if (missing_drops) {
|
||||
result = 1;
|
||||
goto cleanup;
|
||||
}
|
||||
}
|
||||
|
||||
/*
|
||||
* pack_perm stores a permutation between pack-int-ids from the
|
||||
* previous multi-pack-index to the new one we are writing:
|
||||
|
@ -837,11 +885,18 @@ int write_midx_file(const char *object_dir)
|
|||
*/
|
||||
ALLOC_ARRAY(pack_perm, packs.nr);
|
||||
for (i = 0; i < packs.nr; i++) {
|
||||
pack_perm[packs.info[i].orig_pack_int_id] = i;
|
||||
if (packs.info[i].expired) {
|
||||
dropped_packs++;
|
||||
pack_perm[packs.info[i].orig_pack_int_id] = PACK_EXPIRED;
|
||||
} else {
|
||||
pack_perm[packs.info[i].orig_pack_int_id] = i - dropped_packs;
|
||||
}
|
||||
}
|
||||
|
||||
for (i = 0; i < packs.nr; i++)
|
||||
pack_name_concat_len += strlen(packs.info[i].pack_name) + 1;
|
||||
for (i = 0; i < packs.nr; i++) {
|
||||
if (!packs.info[i].expired)
|
||||
pack_name_concat_len += strlen(packs.info[i].pack_name) + 1;
|
||||
}
|
||||
|
||||
if (pack_name_concat_len % MIDX_CHUNK_ALIGNMENT)
|
||||
pack_name_concat_len += MIDX_CHUNK_ALIGNMENT -
|
||||
|
@ -857,7 +912,7 @@ int write_midx_file(const char *object_dir)
|
|||
cur_chunk = 0;
|
||||
num_chunks = large_offsets_needed ? 5 : 4;
|
||||
|
||||
written = write_midx_header(f, num_chunks, packs.nr);
|
||||
written = write_midx_header(f, num_chunks, packs.nr - dropped_packs);
|
||||
|
||||
chunk_ids[cur_chunk] = MIDX_CHUNKID_PACKNAMES;
|
||||
chunk_offsets[cur_chunk] = written + (num_chunks + 1) * MIDX_CHUNKLOOKUP_WIDTH;
|
||||
|
@ -958,7 +1013,12 @@ int write_midx_file(const char *object_dir)
|
|||
free(entries);
|
||||
free(pack_perm);
|
||||
free(midx_name);
|
||||
return 0;
|
||||
return result;
|
||||
}
|
||||
|
||||
int write_midx_file(const char *object_dir)
|
||||
{
|
||||
return write_midx_internal(object_dir, NULL, NULL);
|
||||
}
|
||||
|
||||
void clear_midx_file(struct repository *r)
|
||||
|
@ -1125,5 +1185,44 @@ int verify_midx_file(struct repository *r, const char *object_dir)
|
|||
|
||||
int expire_midx_packs(struct repository *r, const char *object_dir)
|
||||
{
|
||||
return 0;
|
||||
uint32_t i, *count, result = 0;
|
||||
struct string_list packs_to_drop = STRING_LIST_INIT_DUP;
|
||||
struct multi_pack_index *m = load_multi_pack_index(object_dir, 1);
|
||||
|
||||
if (!m)
|
||||
return 0;
|
||||
|
||||
count = xcalloc(m->num_packs, sizeof(uint32_t));
|
||||
for (i = 0; i < m->num_objects; i++) {
|
||||
int pack_int_id = nth_midxed_pack_int_id(m, i);
|
||||
count[pack_int_id]++;
|
||||
}
|
||||
|
||||
for (i = 0; i < m->num_packs; i++) {
|
||||
char *pack_name;
|
||||
|
||||
if (count[i])
|
||||
continue;
|
||||
|
||||
if (prepare_midx_pack(r, m, i))
|
||||
continue;
|
||||
|
||||
if (m->packs[i]->pack_keep)
|
||||
continue;
|
||||
|
||||
pack_name = xstrdup(m->packs[i]->pack_name);
|
||||
close_pack(m->packs[i]);
|
||||
|
||||
string_list_insert(&packs_to_drop, m->pack_names[i]);
|
||||
unlink_pack_path(pack_name, 0);
|
||||
free(pack_name);
|
||||
}
|
||||
|
||||
free(count);
|
||||
|
||||
if (packs_to_drop.nr)
|
||||
result = write_midx_internal(object_dir, m, &packs_to_drop);
|
||||
|
||||
string_list_clear(&packs_to_drop, 0);
|
||||
return result;
|
||||
}
|
||||
|
|
|
@ -412,4 +412,24 @@ test_expect_success 'expire does not remove any packs' '
|
|||
)
|
||||
'
|
||||
|
||||
test_expect_success 'expire removes unreferenced packs' '
|
||||
(
|
||||
cd dup &&
|
||||
git pack-objects --revs .git/objects/pack/pack-combined <<-EOF &&
|
||||
refs/heads/A
|
||||
^refs/heads/C
|
||||
EOF
|
||||
git multi-pack-index write &&
|
||||
ls .git/objects/pack | grep -v -e pack-[AB] >expect &&
|
||||
git multi-pack-index expire &&
|
||||
ls .git/objects/pack >actual &&
|
||||
test_cmp expect actual &&
|
||||
ls .git/objects/pack/ | grep idx >expect-idx &&
|
||||
test-tool read-midx .git/objects | grep idx >actual-midx &&
|
||||
test_cmp expect-idx actual-midx &&
|
||||
git multi-pack-index verify &&
|
||||
git fsck
|
||||
)
|
||||
'
|
||||
|
||||
test_done
|
||||
|
|
Loading…
Reference in a new issue