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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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10
builtin/fast-export.c
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@ -870,7 +870,7 @@ static void handle_tag(const char *name, struct tag *tag)
p = rewrite_commit((struct commit *)tagged);
if (!p) {
printf("reset %s\nfrom %s\n\n",
name, oid_to_hex(&null_oid));
name, oid_to_hex(null_oid()));
free(buf);
return;
}
@ -884,7 +884,7 @@ static void handle_tag(const char *name, struct tag *tag)
if (tagged->type == OBJ_TAG) {
printf("reset %s\nfrom %s\n\n",
name, oid_to_hex(&null_oid));
name, oid_to_hex(null_oid()));
}
skip_prefix(name, "refs/tags/", &name);
printf("tag %s\n", name);
@ -1016,7 +1016,7 @@ static void handle_tags_and_duplicates(struct string_list *extras)
* it.
*/
printf("reset %s\nfrom %s\n\n",
name, oid_to_hex(&null_oid));
name, oid_to_hex(null_oid()));
continue;
}
@ -1035,7 +1035,7 @@ static void handle_tags_and_duplicates(struct string_list *extras)
if (!reference_excluded_commits) {
/* delete the ref */
printf("reset %s\nfrom %s\n\n",
name, oid_to_hex(&null_oid));
name, oid_to_hex(null_oid()));
continue;
}
/* set ref to commit using oid, not mark */
@ -1146,7 +1146,7 @@ static void handle_deletes(void)
continue;
printf("reset %s\nfrom %s\n\n",
refspec->dst, oid_to_hex(&null_oid));
refspec->dst, oid_to_hex(null_oid()));
}
}