pack-write: pass hash_algo to `write_rev_file()`

The `write_rev_file()` function uses the global `the_hash_algo` variable
to access the repository's hash_algo. To avoid global variable usage,
pass a hash_algo from the layers above. Also modify children functions
`write_rev_file_order()` and `write_rev_header()` to accept
'the_hash_algo'.

Altough the layers above could have access to the hash_algo internally,
simply pass in `the_hash_algo`. This avoids any compatibility issues and
bubbles up global variable usage to upper layers which can be eventually
resolved.

However, in `midx-write.c`, since all usage of global variables is
removed, don't reintroduce them and instead use the `repo` available in
the context.

Signed-off-by: Karthik Nayak <karthik.188@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

1 files changed, 2 insertions, 2 deletions

diff --git a/midx-write.c b/midx-write.c
index 0066594fa6..633fa16773 100644
--- a/midx-write.c
+++ b/midx-write.c
@@ -658,8 +658,8 @@ static void write_midx_reverse_index(char *midx_name, unsigned char *midx_hash,
 	strbuf_addf(&buf, "%s-%s.rev", midx_name, hash_to_hex_algop(midx_hash,
 								    ctx->repo->hash_algo));
 
-	tmp_file = write_rev_file_order(NULL, ctx->pack_order, ctx->entries_nr,
-					midx_hash, WRITE_REV);
+	tmp_file = write_rev_file_order(ctx->repo->hash_algo, NULL, ctx->pack_order,
+					ctx->entries_nr, midx_hash, WRITE_REV);
 
 	if (finalize_object_file(tmp_file, buf.buf))
 		die(_("cannot store reverse index file"));