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submodule: fix latent check_has_commit() bug 

When check_has_commit() is called on a missing submodule, initialization
of the struct repository fails, but it attempts to clear the struct
anyway (which is a fatal error). This bug is masked by its only caller,
submodule_has_commits(), first calling add_submodule_odb(). The latter
fails if the submodule does not exist, making submodule_has_commits()
exit early and not invoke check_has_commit().

Fix this bug, and because calling add_submodule_odb() is no longer
necessary as of 13a2f620b2 (submodule: pass repo to
check_has_commit(), 2021-10-08), remove that call too.

This is the last caller of add_submodule_odb(), so remove that
function. (Submodule ODBs are still added as alternates via
add_submodule_odb_by_path().)

Signed-off-by: Glen Choo <chooglen@google.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
This commit is contained in:
Glen Choo 2022-03-07 16:14:33 -08:00 committed by Junio C Hamano
parent b90d9f7632
commit 5fff35d880
2 changed files with 6 additions and 38 deletions
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35
submodule.c
View File

@ -167,26 +167,6 @@ void stage_updated_gitmodules(struct index_state *istate)
static struct string_list added_submodule_odb_paths = STRING_LIST_INIT_NODUP;
/* TODO: remove this function, use repo_submodule_init instead. */
int add_submodule_odb(const char *path)
{
struct strbuf objects_directory = STRBUF_INIT;
int ret = 0;
ret = strbuf_git_path_submodule(&objects_directory, path, "objects/");
if (ret)
goto done;
if (!is_directory(objects_directory.buf)) {
ret = -1;
goto done;
}
string_list_insert(&added_submodule_odb_paths,
strbuf_detach(&objects_directory, NULL));
done:
strbuf_release(&objects_directory);
return ret;
}
void add_submodule_odb_by_path(const char *path)
{
string_list_insert(&added_submodule_odb_paths, xstrdup(path));
@ -986,7 +966,8 @@ static int check_has_commit(const struct object_id *oid, void *data)
if (repo_submodule_init(&subrepo, cb->repo, cb->path, cb->super_oid)) {
cb->result = 0;
goto cleanup;
/* subrepo failed to init, so don't clean it up. */
return 0;
}
type = oid_object_info(&subrepo, oid, NULL);
@ -1022,18 +1003,6 @@ static int submodule_has_commits(struct repository *r,
.super_oid = super_oid
};
/*
* Perform a cheap, but incorrect check for the existence of 'commits'.
* This is done by adding the submodule's object store to the in-core
* object store, and then querying for each commit's existence. If we
* do not have the commit object anywhere, there is no chance we have
* it in the object store of the correct submodule and have it
* reachable from a ref, so we can fail early without spawning rev-list
* which is expensive.
*/
if (add_submodule_odb(path))
return 0;
oid_array_for_each_unique(commits, check_has_commit, &has_commit);
if (has_commit.result) {

9
submodule.h
View File

@ -103,12 +103,11 @@ int submodule_uses_gitfile(const char *path);
int bad_to_remove_submodule(const char *path, unsigned flags);
/*
* Call add_submodule_odb() to add the submodule at the given path to a list.
* When register_all_submodule_odb_as_alternates() is called, the object stores
* of all submodules in that list will be added as alternates in
* the_repository.
* Call add_submodule_odb_by_path() to add the submodule at the given
* path to a list. When register_all_submodule_odb_as_alternates() is
* called, the object stores of all submodules in that list will be
* added as alternates in the_repository.
*/
int add_submodule_odb(const char *path);
void add_submodule_odb_by_path(const char *path);
int register_all_submodule_odb_as_alternates(void);