[PATCH 1/3] repack: respect --keep-pack with geometric repack
From: Victoria Dye <vdye@github.com>
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>
---
builtin/repack.c | 46 ++++++++++++++++++++++++++++---------
t/t7703-repack-geometric.sh | 28 ++++++++++++++++++++++
2 files changed, 63 insertions(+), 11 deletions(-)
Show changes to 2 files +63 −11
builtin/repack.c, t/t7703-repack-geometric.sh
diff --git a/builtin/repack.c b/builtin/repack.c
index d1a563d5b6..ea56e92ad5 100644
--- a/builtin/repack.c
+++ b/builtin/repack.c
@@ -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);
}
+ 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);
+ init_pack_geometry(&geometry, &existing_kept_packs);
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);
-
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);
diff --git a/t/t7703-repack-geometric.sh b/t/t7703-repack-geometric.sh
index bdbbcbf1ec..91bb2b37a8 100755
--- a/t/t7703-repack-geometric.sh
+++ b/t/t7703-repack-geometric.sh
@@ -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" &&
--
2.36.1.94.gb0d54bedca
Taylor Blau
