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hash: provide per-algorithm null OIDs

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Up until recently, object IDs did not have an algorithm member, only a
hash.  Consequently, it was possible to share one null (all-zeros)
object ID among all hash algorithms.  Now that we're going to be
handling objects from multiple hash algorithms, it's important to make
sure that all object IDs have a correct algorithm field.

Introduce a per-algorithm null OID, and add it to struct hash_algo.
Introduce a wrapper function as well, and use it everywhere we used to
use the null_oid constant.

Signed-off-by: brian m. carlson <sandals@crustytoothpaste.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
This commit is contained in:
brian m. carlson
2021-04-26 01:02:56 +00:00
committed by Junio C Hamano
parent 5a6dce70d7
commit 14228447c9
42 changed files with 119 additions and 95 deletions
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26
submodule.c
View File

@ -113,7 +113,7 @@ int update_path_in_gitmodules(const char *oldpath, const char *newpath)
if (is_gitmodules_unmerged(the_repository->index))
die(_("Cannot change unmerged .gitmodules, resolve merge conflicts first"));
submodule = submodule_from_path(the_repository, &null_oid, oldpath);
submodule = submodule_from_path(the_repository, null_oid(), oldpath);
if (!submodule || !submodule->name) {
warning(_("Could not find section in .gitmodules where path=%s"), oldpath);
return -1;
@ -142,7 +142,7 @@ int remove_path_from_gitmodules(const char *path)
if (is_gitmodules_unmerged(the_repository->index))
die(_("Cannot change unmerged .gitmodules, resolve merge conflicts first"));
submodule = submodule_from_path(the_repository, &null_oid, path);
submodule = submodule_from_path(the_repository, null_oid(), path);
if (!submodule || !submodule->name) {
warning(_("Could not find section in .gitmodules where path=%s"), path);
return -1;
@ -188,7 +188,8 @@ void set_diffopt_flags_from_submodule_config(struct diff_options *diffopt,
const char *path)
{
const struct submodule *submodule = submodule_from_path(the_repository,
&null_oid, path);
null_oid(),
path);
if (submodule) {
const char *ignore;
char *key;
@ -244,7 +245,7 @@ int is_submodule_active(struct repository *repo, const char *path)
const struct string_list *sl;
const struct submodule *module;
module = submodule_from_path(repo, &null_oid, path);
module = submodule_from_path(repo, null_oid(), path);
/* early return if there isn't a path->module mapping */
if (!module)
@ -745,7 +746,7 @@ const struct submodule *submodule_from_ce(const struct cache_entry *ce)
if (!should_update_submodules())
return NULL;
return submodule_from_path(the_repository, &null_oid, ce->name);
return submodule_from_path(the_repository, null_oid(), ce->name);
}
static struct oid_array *submodule_commits(struct string_list *submodules,
@ -1037,7 +1038,7 @@ int find_unpushed_submodules(struct repository *r,
const struct submodule *submodule;
const char *path = NULL;
submodule = submodule_from_name(r, &null_oid, name->string);
submodule = submodule_from_name(r, null_oid(), name->string);
if (submodule)
path = submodule->path;
else
@ -1224,7 +1225,7 @@ static void calculate_changed_submodule_paths(struct repository *r,
const struct submodule *submodule;
const char *path = NULL;
submodule = submodule_from_name(r, &null_oid, name->string);
submodule = submodule_from_name(r, null_oid(), name->string);
if (submodule)
path = submodule->path;
else
@ -1361,7 +1362,7 @@ static struct fetch_task *fetch_task_create(struct repository *r,
struct fetch_task *task = xmalloc(sizeof(*task));
memset(task, 0, sizeof(*task));
task->sub = submodule_from_path(r, &null_oid, path);
task->sub = submodule_from_path(r, null_oid(), path);
if (!task->sub) {
/*
* No entry in .gitmodules? Technically not a submodule,
@ -1917,7 +1918,7 @@ int submodule_move_head(const char *path,
if (old_head && !is_submodule_populated_gently(path, error_code_ptr))
return 0;
sub = submodule_from_path(the_repository, &null_oid, path);
sub = submodule_from_path(the_repository, null_oid(), path);
if (!sub)
BUG("could not get submodule information for '%s'", path);
@ -2076,7 +2077,7 @@ static void relocate_single_git_dir_into_superproject(const char *path)
real_old_git_dir = real_pathdup(old_git_dir, 1);
sub = submodule_from_path(the_repository, &null_oid, path);
sub = submodule_from_path(the_repository, null_oid(), path);
if (!sub)
die(_("could not lookup name for submodule '%s'"), path);
@ -2135,7 +2136,7 @@ void absorb_git_dir_into_superproject(const char *path,
* superproject did not rewrite the git file links yet,
* fix it now.
*/
sub = submodule_from_path(the_repository, &null_oid, path);
sub = submodule_from_path(the_repository, null_oid(), path);
if (!sub)
die(_("could not lookup name for submodule '%s'"), path);
connect_work_tree_and_git_dir(path,
@ -2283,7 +2284,8 @@ int submodule_to_gitdir(struct strbuf *buf, const char *submodule)
strbuf_addstr(buf, git_dir);
}
if (!is_git_directory(buf->buf)) {
sub = submodule_from_path(the_repository, &null_oid, submodule);
sub = submodule_from_path(the_repository, null_oid(),
submodule);
if (!sub) {
ret = -1;
goto cleanup;