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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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4
builtin/worktree.c
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@ -331,7 +331,7 @@ static int add_worktree(const char *path, const char *refname,
*/
strbuf_reset(&sb);
strbuf_addf(&sb, "%s/HEAD", sb_repo.buf);
write_file(sb.buf, "%s", oid_to_hex(&null_oid));
write_file(sb.buf, "%s", oid_to_hex(null_oid()));
strbuf_reset(&sb);
strbuf_addf(&sb, "%s/commondir", sb_repo.buf);
write_file(sb.buf, "../..");
@ -394,7 +394,7 @@ done:
cp.argv = NULL;
cp.trace2_hook_name = "post-checkout";
strvec_pushl(&cp.args, absolute_path(hook),
oid_to_hex(&null_oid),
oid_to_hex(null_oid()),
oid_to_hex(&commit->object.oid),
"1", NULL);
ret = run_command(&cp);