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midx: keep track of the checksum

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write_midx_internal() uses a hashfile to write the multi-pack index, but
discards its checksum. This makes sense, since nothing that takes place
after writing the MIDX cares about its checksum.

That is about to change in a subsequent patch, when the optional
reverse index corresponding to the MIDX will want to include the MIDX's
checksum.

Store the checksum of the MIDX in preparation for that.

Signed-off-by: Taylor Blau <me@ttaylorr.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
This commit is contained in:
Taylor Blau 2021-03-30 11:04:17 -04:00 committed by Junio C Hamano
parent 7240cc4b65
commit 9f19161172
1 changed files with 2 additions and 1 deletions
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3
midx.c
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@ -811,6 +811,7 @@ static int write_midx_internal(const char *object_dir, struct multi_pack_index *
unsigned flags)
{
char *midx_name;
unsigned char midx_hash[GIT_MAX_RAWSZ];
uint32_t i;
struct hashfile *f = NULL;
struct lock_file lk;
@ -987,7 +988,7 @@ static int write_midx_internal(const char *object_dir, struct multi_pack_index *
write_midx_header(f, get_num_chunks(cf), ctx.nr - dropped_packs);
write_chunkfile(cf, &ctx);
finalize_hashfile(f, NULL, CSUM_FSYNC | CSUM_HASH_IN_STREAM);
finalize_hashfile(f, midx_hash, CSUM_FSYNC | CSUM_HASH_IN_STREAM);
free_chunkfile(cf);
commit_lock_file(&lk);