packfile: refactor get_packed_git() to work on packfile store

The `get_packed_git()` function prepares the packfile store and then
returns its packfiles. Refactor it to accept a packfile store instead of
a repository to clarify its scope.

Signed-off-by: Patrick Steinhardt <ps@pks.im>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

Author: pks-t

builtin/gc.c

@@ -1423,7 +1423,7 @@ static int incremental_repack_auto_condition(struct gc_config *cfg UNUSED)
 	if (incremental_repack_auto_limit < 0)
 		return 1;
 
-	for (p = get_packed_git(the_repository);
+	for (p = packfile_store_get_packs(the_repository->objects->packfiles);
 	     count < incremental_repack_auto_limit && p;
 	     p = p->next) {
 		if (!p->multi_pack_index)

builtin/grep.c

@@ -1214,7 +1214,7 @@ int cmd_grep(int argc,
 		if (recurse_submodules)
 			repo_read_gitmodules(the_repository, 1);
 		if (startup_info->have_repository)
-			(void)get_packed_git(the_repository);
+			(void)packfile_store_get_packs(the_repository->objects->packfiles);
 
 		start_threads(&opt);
 	} else {

object-name.c

@@ -213,7 +213,7 @@ static void find_short_packed_object(struct disambiguate_state *ds)
 			unique_in_midx(m, ds);
 	}
 
-	for (p = get_packed_git(ds->repo); p && !ds->ambiguous;
+	for (p = packfile_store_get_packs(ds->repo->objects->packfiles); p && !ds->ambiguous;
 	     p = p->next)
 		unique_in_pack(p, ds);
 }
@@ -806,7 +806,7 @@ static void find_abbrev_len_packed(struct min_abbrev_data *mad)
 			find_abbrev_len_for_midx(m, mad);
 	}
 
-	for (p = get_packed_git(mad->repo); p; p = p->next)
+	for (p = packfile_store_get_packs(mad->repo->objects->packfiles); p; p = p->next)
 		find_abbrev_len_for_pack(p, mad);
 }
 

packfile.c

@@ -1027,10 +1027,10 @@ void packfile_store_reprepare(struct packfile_store *store)
 	packfile_store_prepare(store);
 }
 
-struct packed_git *get_packed_git(struct repository *r)
+struct packed_git *packfile_store_get_packs(struct packfile_store *store)
 {
-	packfile_store_prepare(r->objects->packfiles);
-	return r->objects->packfiles->packs;
+	packfile_store_prepare(store);
+	return store->packs;
 }
 
 struct packed_git *get_all_packs(struct repository *r)

packfile.h

@@ -136,6 +136,12 @@ void packfile_store_reprepare(struct packfile_store *store);
 void packfile_store_add_pack(struct packfile_store *store,
 			     struct packed_git *pack);
 
+/*
+ * Get packs managed by the given store. Does not load the MIDX or any packs
+ * referenced by it.
+ */
+struct packed_git *packfile_store_get_packs(struct packfile_store *store);
+
 /*
  * Open the packfile and add it to the store if it isn't yet known. Returns
  * either the newly opened packfile or the preexisting packfile. Returns a
@@ -220,7 +226,6 @@ int for_each_packed_object(struct repository *repo, each_packed_object_fn cb,
 #define PACKDIR_FILE_GARBAGE 4
 extern void (*report_garbage)(unsigned seen_bits, const char *path);
 
-struct packed_git *get_packed_git(struct repository *r);
 struct list_head *get_packed_git_mru(struct repository *r);
 struct packed_git *get_all_packs(struct repository *r);