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Merge branch 'tb/midx-race-in-pack-objects'

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The multi-pack-index code did not protect the packfile it is going
to depend on from getting removed while in use, which has been
corrected.

* tb/midx-race-in-pack-objects:
  builtin/pack-objects.c: ensure pack validity from MIDX bitmap objects
  builtin/pack-objects.c: ensure included `--stdin-packs` exist
  builtin/pack-objects.c: avoid redundant NULL check
  pack-bitmap.c: check preferred pack validity when opening MIDX bitmap
This commit is contained in:
Junio C Hamano 2022-06-03 14:30:35 -07:00
commit 091680472d
2 changed files with 42 additions and 19 deletions
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43
builtin/pack-objects.c
View File

@ -1357,6 +1357,9 @@ static int want_found_object(const struct object_id *oid, int exclude,
if (incremental)
return 0;
if (!is_pack_valid(p))
return -1;
/*
* When asked to do --local (do not include an object that appears in a
* pack we borrow from elsewhere) or --honor-pack-keep (do not include
@ -1472,6 +1475,9 @@ static int want_object_in_pack(const struct object_id *oid,
want = want_found_object(oid, exclude, *found_pack);
if (want != -1)
return want;
*found_pack = NULL;
*found_offset = 0;
}
for (m = get_multi_pack_index(the_repository); m; m = m->next) {
@ -3201,10 +3207,8 @@ static int add_object_entry_from_pack(const struct object_id *oid,
uint32_t pos,
void *_data)
{
struct rev_info *revs = _data;
struct object_info oi = OBJECT_INFO_INIT;
off_t ofs;
enum object_type type;
enum object_type type = OBJ_NONE;
display_progress(progress_state, ++nr_seen);
@ -3215,19 +3219,24 @@ static int add_object_entry_from_pack(const struct object_id *oid,
if (!want_object_in_pack(oid, 0, &p, &ofs))
return 0;
oi.typep = &type;
if (packed_object_info(the_repository, p, ofs, &oi) < 0)
die(_("could not get type of object %s in pack %s"),
oid_to_hex(oid), p->pack_name);
else if (type == OBJ_COMMIT) {
/*
* commits in included packs are used as starting points for the
* subsequent revision walk
*/
add_pending_oid(revs, NULL, oid, 0);
}
if (p) {
struct rev_info *revs = _data;
struct object_info oi = OBJECT_INFO_INIT;
stdin_packs_found_nr++;
oi.typep = &type;
if (packed_object_info(the_repository, p, ofs, &oi) < 0) {
die(_("could not get type of object %s in pack %s"),
oid_to_hex(oid), p->pack_name);
} else if (type == OBJ_COMMIT) {
/*
* commits in included packs are used as starting points for the
* subsequent revision walk
*/
add_pending_oid(revs, NULL, oid, 0);
}
stdin_packs_found_nr++;
}
create_object_entry(oid, type, 0, 0, 0, p, ofs);
@ -3346,6 +3355,8 @@ static void read_packs_list_from_stdin(void)
struct packed_git *p = item->util;
if (!p)
die(_("could not find pack '%s'"), item->string);
if (!is_pack_valid(p))
die(_("packfile %s cannot be accessed"), p->pack_name);
}
/*
@ -3369,8 +3380,6 @@ static void read_packs_list_from_stdin(void)
for_each_string_list_item(item, &include_packs) {
struct packed_git *p = item->util;
if (!p)
die(_("could not find pack '%s'"), item->string);
for_each_object_in_pack(p,
add_object_entry_from_pack,
&revs,

18
pack-bitmap.c
View File

@ -315,6 +315,8 @@ static int open_midx_bitmap_1(struct bitmap_index *bitmap_git,
struct stat st;
char *idx_name = midx_bitmap_filename(midx);
int fd = git_open(idx_name);
uint32_t i;
struct packed_git *preferred;
free(idx_name);
@ -353,6 +355,20 @@ static int open_midx_bitmap_1(struct bitmap_index *bitmap_git,
warning(_("multi-pack bitmap is missing required reverse index"));
goto cleanup;
}
for (i = 0; i < bitmap_git->midx->num_packs; i++) {
if (prepare_midx_pack(the_repository, bitmap_git->midx, i))
die(_("could not open pack %s"),
bitmap_git->midx->pack_names[i]);
}
preferred = bitmap_git->midx->packs[midx_preferred_pack(bitmap_git)];
if (!is_pack_valid(preferred)) {
warning(_("preferred pack (%s) is invalid"),
preferred->pack_name);
goto cleanup;
}
return 0;
cleanup:
@ -429,8 +445,6 @@ static int load_reverse_index(struct bitmap_index *bitmap_git)
* since we will need to make use of them in pack-objects.
*/
for (i = 0; i < bitmap_git->midx->num_packs; i++) {
if (prepare_midx_pack(the_repository, bitmap_git->midx, i))
die(_("load_reverse_index: could not open pack"));
ret = load_pack_revindex(bitmap_git->midx->packs[i]);
if (ret)
return ret;