merge(3p/git): Merge git subtree at v2.29.2 r/1890

This also bumps the stable nixpkgs to 20.09 as of 2020-11-21, because
there is some breakage in the git build related to the netrc
credentials helper which someone has taken care of in nixpkgs.

The stable channel is not used for anything other than git, so this
should be fine.

Change-Id: I3575a19dab09e1e9556cf8231d717de9890484fb

1 files changed, 15 insertions, 17 deletions

diff --git a/third_party/git/pack-check.c b/third_party/git/pack-check.c
index 2cc3603189..dad6d8ae7f 100644
--- a/third_party/git/pack-check.c
+++ b/third_party/git/pack-check.c
@@ -8,10 +8,6 @@
 
 struct idx_entry {
 	off_t                offset;
-	union idx_entry_object {
-		const unsigned char *hash;
-		struct object_id *oid;
-	} oid;
 	unsigned int nr;
 };
 
@@ -67,23 +63,23 @@ static int verify_packfile(struct repository *r,
 	if (!is_pack_valid(p))
 		return error("packfile %s cannot be accessed", p->pack_name);
 
-	the_hash_algo->init_fn(&ctx);
+	r->hash_algo->init_fn(&ctx);
 	do {
 		unsigned long remaining;
 		unsigned char *in = use_pack(p, w_curs, offset, &remaining);
 		offset += remaining;
 		if (!pack_sig_ofs)
-			pack_sig_ofs = p->pack_size - the_hash_algo->rawsz;
+			pack_sig_ofs = p->pack_size - r->hash_algo->rawsz;
 		if (offset > pack_sig_ofs)
 			remaining -= (unsigned int)(offset - pack_sig_ofs);
-		the_hash_algo->update_fn(&ctx, in, remaining);
+		r->hash_algo->update_fn(&ctx, in, remaining);
 	} while (offset < pack_sig_ofs);
-	the_hash_algo->final_fn(hash, &ctx);
+	r->hash_algo->final_fn(hash, &ctx);
 	pack_sig = use_pack(p, w_curs, pack_sig_ofs, NULL);
 	if (!hasheq(hash, pack_sig))
 		err = error("%s pack checksum mismatch",
 			    p->pack_name);
-	if (!hasheq(index_base + index_size - the_hash_algo->hexsz, pack_sig))
+	if (!hasheq(index_base + index_size - r->hash_algo->hexsz, pack_sig))
 		err = error("%s pack checksum does not match its index",
 			    p->pack_name);
 	unuse_pack(w_curs);
@@ -97,9 +93,6 @@ static int verify_packfile(struct repository *r,
 	entries[nr_objects].offset = pack_sig_ofs;
 	/* first sort entries by pack offset, since unpacking them is more efficient that way */
 	for (i = 0; i < nr_objects; i++) {
-		entries[i].oid.hash = nth_packed_object_sha1(p, i);
-		if (!entries[i].oid.hash)
-			die("internal error pack-check nth-packed-object");
 		entries[i].offset = nth_packed_object_offset(p, i);
 		entries[i].nr = i;
 	}
@@ -107,11 +100,16 @@ static int verify_packfile(struct repository *r,
 
 	for (i = 0; i < nr_objects; i++) {
 		void *data;
+		struct object_id oid;
 		enum object_type type;
 		unsigned long size;
 		off_t curpos;
 		int data_valid;
 
+		if (nth_packed_object_id(&oid, p, entries[i].nr) < 0)
+			BUG("unable to get oid of object %lu from %s",
+			    (unsigned long)entries[i].nr, p->pack_name);
+
 		if (p->index_version > 1) {
 			off_t offset = entries[i].offset;
 			off_t len = entries[i+1].offset - offset;
@@ -119,7 +117,7 @@ static int verify_packfile(struct repository *r,
 			if (check_pack_crc(p, w_curs, offset, len, nr))
 				err = error("index CRC mismatch for object %s "
 					    "from %s at offset %"PRIuMAX"",
-					    oid_to_hex(entries[i].oid.oid),
+					    oid_to_hex(&oid),
 					    p->pack_name, (uintmax_t)offset);
 		}
 
@@ -142,14 +140,14 @@ static int verify_packfile(struct repository *r,
 
 		if (data_valid && !data)
 			err = error("cannot unpack %s from %s at offset %"PRIuMAX"",
-				    oid_to_hex(entries[i].oid.oid), p->pack_name,
+				    oid_to_hex(&oid), p->pack_name,
 				    (uintmax_t)entries[i].offset);
-		else if (check_object_signature(entries[i].oid.oid, data, size, type_name(type)))
+		else if (check_object_signature(r, &oid, data, size, type_name(type)))
 			err = error("packed %s from %s is corrupt",
-				    oid_to_hex(entries[i].oid.oid), p->pack_name);
+				    oid_to_hex(&oid), p->pack_name);
 		else if (fn) {
 			int eaten = 0;
-			err |= fn(entries[i].oid.oid, type, size, data, &eaten);
+			err |= fn(&oid, type, size, data, &eaten);
 			if (eaten)
 				data = NULL;
 		}