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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
archive.c
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@ -275,9 +275,11 @@ int write_archive_entries(struct archiver_args *args,
int err;
struct strbuf path_in_archive = STRBUF_INIT;
struct strbuf content = STRBUF_INIT;
struct object_id fake_oid = null_oid;
struct object_id fake_oid;
int i;
oidcpy(&fake_oid, null_oid());
if (args->baselen > 0 && args->base[args->baselen - 1] == '/') {
size_t len = args->baselen;