oid_object_info(): drop type_name strbuf

We provide a mechanism for callers to get the object type as a raw
string, rather than an object_type enum. This was in theory useful for
returning types that are not representable in the enum, but we consider
any such type to be an error, and there are no callers that use the
strbuf anymore.

Let's drop support to simplify the code a bit.

Signed-off-by: Jeff King <peff@peff.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

Author: peff

object-file.c

@@ -403,8 +403,6 @@ int parse_loose_header(const char *hdr, struct object_info *oi)
 	}
 
 	type = type_from_string_gently(type_buf, type_len, 1);
-	if (oi->type_name)
-		strbuf_add(oi->type_name, type_buf, type_len);
 	if (oi->typep)
 		*oi->typep = type;
 
@@ -466,7 +464,7 @@ int loose_object_info(struct repository *r,
 	 * return value implicitly indicates whether the
 	 * object even exists.
 	 */
-	if (!oi->typep && !oi->type_name && !oi->sizep && !oi->contentp) {
+	if (!oi->typep && !oi->sizep && !oi->contentp) {
 		struct stat st;
 		if (!oi->disk_sizep && (flags & OBJECT_INFO_QUICK))
 			return quick_has_loose(r, oid) ? 0 : -1;

object-store.c

@@ -646,8 +646,6 @@ static int do_oid_object_info_extended(struct repository *r,
 			*(oi->disk_sizep) = 0;
 		if (oi->delta_base_oid)
 			oidclr(oi->delta_base_oid, the_repository->hash_algo);
-		if (oi->type_name)
-			strbuf_addstr(oi->type_name, type_name(co->type));
 		if (oi->contentp)
 			*oi->contentp = xmemdupz(co->buf, co->size);
 		oi->whence = OI_CACHED;

object-store.h

@@ -205,7 +205,6 @@ struct object_info {
 	unsigned long *sizep;
 	off_t *disk_sizep;
 	struct object_id *delta_base_oid;
-	struct strbuf *type_name;
 	void **contentp;
 
 	/* Response */

packfile.c

@@ -1598,17 +1598,12 @@ int packed_object_info(struct repository *r, struct packed_git *p,
 		*oi->disk_sizep = pack_pos_to_offset(p, pos + 1) - obj_offset;
 	}
 
-	if (oi->typep || oi->type_name) {
+	if (oi->typep) {
 		enum object_type ptot;
 		ptot = packed_to_object_type(r, p, obj_offset,
 					     type, &w_curs, curpos);
 		if (oi->typep)
 			*oi->typep = ptot;
-		if (oi->type_name) {
-			const char *tn = type_name(ptot);
-			if (tn)
-				strbuf_addstr(oi->type_name, tn);
-		}
 		if (ptot < 0) {
 			type = OBJ_BAD;
 			goto out;