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repack: respect --keep-pack with geometric repack 

Update 'repack' to ignore packs named on the command line with the
'--keep-pack' option. Specifically, modify 'init_pack_geometry()' to treat
command line-kept packs the same way it treats packs with an on-disk '.keep'
file (that is, skip the pack and do not include it in the 'geometry'
structure).

Without this handling, a '--keep-pack' pack would be included in the
'geometry' structure. If the pack is *before* the geometry split line (with
at least one other pack and/or loose objects present), 'repack' assumes the
pack's contents are "rolled up" into another pack via 'pack-objects'.
However, because the internally-invoked 'pack-objects' properly excludes
'--keep-pack' objects, any new pack it creates will not contain the kept
objects. Finally, 'repack' deletes the '--keep-pack' as "redundant" (since
it assumes 'pack-objects' created a new pack with its contents), resulting
in possible object loss and repository corruption.

Add a test ensuring that '--keep-pack' packs are now appropriately handled.

Co-authored-by: Taylor Blau <me@ttaylorr.com>
Signed-off-by: Victoria Dye <vdye@github.com>
Signed-off-by: Taylor Blau <me@ttaylorr.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
This commit is contained in:
Victoria Dye 2022-05-20 15:01:45 -04:00 committed by Junio C Hamano
parent e54793a95a
commit 4b5a808bb9
2 changed files with 65 additions and 13 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

50
builtin/repack.c
View File

@ -137,6 +137,8 @@ static void collect_pack_filenames(struct string_list *fname_nonkept_list,
string_list_append_nodup(fname_nonkept_list, fname);
}
closedir(dir);
string_list_sort(fname_kept_list);
}
static void remove_redundant_pack(const char *dir_name, const char *base_name)
@ -332,17 +334,38 @@ static int geometry_cmp(const void *va, const void *vb)
return 0;
}
static void init_pack_geometry(struct pack_geometry **geometry_p)
static void init_pack_geometry(struct pack_geometry **geometry_p,
struct string_list *existing_kept_packs)
{
struct packed_git *p;
struct pack_geometry *geometry;
struct strbuf buf = STRBUF_INIT;
*geometry_p = xcalloc(1, sizeof(struct pack_geometry));
geometry = *geometry_p;
for (p = get_all_packs(the_repository); p; p = p->next) {
if (!pack_kept_objects && p->pack_keep)
continue;
if (!pack_kept_objects) {
/*
* Any pack that has its pack_keep bit set will appear
* in existing_kept_packs below, but this saves us from
* doing a more expensive check.
*/
if (p->pack_keep)
continue;
/*
* The pack may be kept via the --keep-pack option;
* check 'existing_kept_packs' to determine whether to
* ignore it.
*/
strbuf_reset(&buf);
strbuf_addstr(&buf, pack_basename(p));
strbuf_strip_suffix(&buf, ".pack");
if (string_list_has_string(existing_kept_packs, buf.buf))
continue;
}
ALLOC_GROW(geometry->pack,
geometry->pack_nr + 1,
@ -353,6 +376,7 @@ static void init_pack_geometry(struct pack_geometry **geometry_p)
}
QSORT(geometry->pack, geometry->pack_nr, geometry_cmp);
strbuf_release(&buf);
}
static void split_pack_geometry(struct pack_geometry *geometry, int factor)
@ -714,17 +738,20 @@ int cmd_repack(int argc, const char **argv, const char *prefix)
strbuf_release(&path);
}
if (geometric_factor) {
if (pack_everything)
die(_("options '%s' and '%s' cannot be used together"), "--geometric", "-A/-a");
init_pack_geometry(&geometry);
split_pack_geometry(geometry, geometric_factor);
}
packdir = mkpathdup("%s/pack", get_object_directory());
packtmp_name = xstrfmt(".tmp-%d-pack", (int)getpid());
packtmp = mkpathdup("%s/%s", packdir, packtmp_name);
collect_pack_filenames(&existing_nonkept_packs, &existing_kept_packs,
&keep_pack_list);
if (geometric_factor) {
if (pack_everything)
die(_("options '%s' and '%s' cannot be used together"), "--geometric", "-A/-a");
init_pack_geometry(&geometry, &existing_kept_packs);
split_pack_geometry(geometry, geometric_factor);
}
sigchain_push_common(remove_pack_on_signal);
prepare_pack_objects(&cmd, &po_args);
@ -764,9 +791,6 @@ int cmd_repack(int argc, const char **argv, const char *prefix)
if (use_delta_islands)
strvec_push(&cmd.args, "--delta-islands");
collect_pack_filenames(&existing_nonkept_packs, &existing_kept_packs,
&keep_pack_list);
if (pack_everything & ALL_INTO_ONE) {
repack_promisor_objects(&po_args, &names);

28
t/t7703-repack-geometric.sh
View File

@ -180,6 +180,34 @@ test_expect_success '--geometric ignores kept packs' '
)
'
test_expect_success '--geometric ignores --keep-pack packs' '
git init geometric &&
test_when_finished "rm -fr geometric" &&
(
cd geometric &&
# Create two equal-sized packs
test_commit kept && # 3 objects
git repack -d &&
test_commit pack && # 3 objects
git repack -d &&
find $objdir/pack -type f -name "*.pack" | sort >packs.before &&
git repack --geometric 2 -dm \
--keep-pack="$(basename "$(head -n 1 packs.before)")" >out &&
find $objdir/pack -type f -name "*.pack" | sort >packs.after &&
# Packs should not have changed (only one non-kept pack, no
# loose objects), but $midx should now exist.
grep "Nothing new to pack" out &&
test_path_is_file $midx &&
test_cmp packs.before packs.after &&
git fsck
)
'
test_expect_success '--geometric chooses largest MIDX preferred pack' '
git init geometric &&
test_when_finished "rm -fr geometric" &&