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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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2
t/helper/test-submodule-nested-repo-config.c
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@ -18,7 +18,7 @@ int cmd__submodule_nested_repo_config(int argc, const char **argv)
setup_git_directory();
sub = submodule_from_path(the_repository, &null_oid, argv[1]);
sub = submodule_from_path(the_repository, null_oid(), argv[1]);
if (repo_submodule_init(&subrepo, the_repository, sub)) {
die_usage(argv, "Submodule not found.");
}