Merge branch 'bc/object-id'

Conversion from uchar[20] to struct object_id continues.

* bc/object-id: (53 commits)
  object: convert parse_object* to take struct object_id
  tree: convert parse_tree_indirect to struct object_id
  sequencer: convert do_recursive_merge to struct object_id
  diff-lib: convert do_diff_cache to struct object_id
  builtin/ls-tree: convert to struct object_id
  merge: convert checkout_fast_forward to struct object_id
  sequencer: convert fast_forward_to to struct object_id
  builtin/ls-files: convert overlay_tree_on_cache to object_id
  builtin/read-tree: convert to struct object_id
  sha1_name: convert internals of peel_onion to object_id
  upload-pack: convert remaining parse_object callers to object_id
  revision: convert remaining parse_object callers to object_id
  revision: rename add_pending_sha1 to add_pending_oid
  http-push: convert process_ls_object and descendants to object_id
  refs/files-backend: convert many internals to struct object_id
  refs: convert struct ref_update to use struct object_id
  ref-filter: convert some static functions to struct object_id
  Convert struct ref_array_item to struct object_id
  Convert the verify_pack callback to struct object_id
  Convert lookup_tag to struct object_id
  ...

4 files changed, 79 insertions, 87 deletions

diff --git a/refs/files-backend.c b/refs/files-backend.c
index 4925e698d8..cb1f528cbe 100644
--- a/refs/files-backend.c
+++ b/refs/files-backend.c
@@ -195,27 +195,15 @@ static const char PACKED_REFS_HEADER[] =
  * Return a pointer to the refname within the line (null-terminated),
  * or NULL if there was a problem.
  */
-static const char *parse_ref_line(struct strbuf *line, unsigned char *sha1)
+static const char *parse_ref_line(struct strbuf *line, struct object_id *oid)
 {
 	const char *ref;
 
-	/*
-	 * 42: the answer to everything.
-	 *
-	 * In this case, it happens to be the answer to
-	 *  40 (length of sha1 hex representation)
-	 *  +1 (space in between hex and name)
-	 *  +1 (newline at the end of the line)
-	 */
-	if (line->len <= 42)
+	if (parse_oid_hex(line->buf, oid, &ref) < 0)
 		return NULL;
-
-	if (get_sha1_hex(line->buf, sha1) < 0)
-		return NULL;
-	if (!isspace(line->buf[40]))
+	if (!isspace(*ref++))
 		return NULL;
 
-	ref = line->buf + 41;
 	if (isspace(*ref))
 		return NULL;
 
@@ -260,7 +248,7 @@ static void read_packed_refs(FILE *f, struct ref_dir *dir)
 	enum { PEELED_NONE, PEELED_TAGS, PEELED_FULLY } peeled = PEELED_NONE;
 
 	while (strbuf_getwholeline(&line, f, '\n') != EOF) {
-		unsigned char sha1[20];
+		struct object_id oid;
 		const char *refname;
 		const char *traits;
 
@@ -273,17 +261,17 @@ static void read_packed_refs(FILE *f, struct ref_dir *dir)
 			continue;
 		}
 
-		refname = parse_ref_line(&line, sha1);
+		refname = parse_ref_line(&line, &oid);
 		if (refname) {
 			int flag = REF_ISPACKED;
 
 			if (check_refname_format(refname, REFNAME_ALLOW_ONELEVEL)) {
 				if (!refname_is_safe(refname))
 					die("packed refname is dangerous: %s", refname);
-				hashclr(sha1);
+				oidclr(&oid);
 				flag |= REF_BAD_NAME | REF_ISBROKEN;
 			}
-			last = create_ref_entry(refname, sha1, flag, 0);
+			last = create_ref_entry(refname, &oid, flag, 0);
 			if (peeled == PEELED_FULLY ||
 			    (peeled == PEELED_TAGS && starts_with(refname, "refs/tags/")))
 				last->flag |= REF_KNOWS_PEELED;
@@ -294,8 +282,8 @@ static void read_packed_refs(FILE *f, struct ref_dir *dir)
 		    line.buf[0] == '^' &&
 		    line.len == PEELED_LINE_LENGTH &&
 		    line.buf[PEELED_LINE_LENGTH - 1] == '\n' &&
-		    !get_sha1_hex(line.buf + 1, sha1)) {
-			hashcpy(last->u.value.peeled.hash, sha1);
+		    !get_oid_hex(line.buf + 1, &oid)) {
+			oidcpy(&last->u.value.peeled, &oid);
 			/*
 			 * Regardless of what the file header said,
 			 * we definitely know the value of *this*
@@ -404,14 +392,14 @@ static struct ref_dir *get_packed_refs(struct files_ref_store *refs)
  * commit_packed_refs().
  */
 static void add_packed_ref(struct files_ref_store *refs,
-			   const char *refname, const unsigned char *sha1)
+			   const char *refname, const struct object_id *oid)
 {
 	struct packed_ref_cache *packed_ref_cache = get_packed_ref_cache(refs);
 
 	if (!packed_ref_cache->lock)
 		die("internal error: packed refs not locked");
 	add_ref_entry(get_packed_ref_dir(packed_ref_cache),
-		      create_ref_entry(refname, sha1, REF_ISPACKED, 1));
+		      create_ref_entry(refname, oid, REF_ISPACKED, 1));
 }
 
 /*
@@ -444,7 +432,7 @@ static void loose_fill_ref_dir(struct ref_store *ref_store,
 	strbuf_add(&refname, dirname, dirnamelen);
 
 	while ((de = readdir(d)) != NULL) {
-		unsigned char sha1[20];
+		struct object_id oid;
 		struct stat st;
 		int flag;
 
@@ -465,10 +453,10 @@ static void loose_fill_ref_dir(struct ref_store *ref_store,
 			if (!refs_resolve_ref_unsafe(&refs->base,
 						     refname.buf,
 						     RESOLVE_REF_READING,
-						     sha1, &flag)) {
-				hashclr(sha1);
+						     oid.hash, &flag)) {
+				oidclr(&oid);
 				flag |= REF_ISBROKEN;
-			} else if (is_null_sha1(sha1)) {
+			} else if (is_null_oid(&oid)) {
 				/*
 				 * It is so astronomically unlikely
 				 * that NULL_SHA1 is the SHA-1 of an
@@ -484,11 +472,11 @@ static void loose_fill_ref_dir(struct ref_store *ref_store,
 						 REFNAME_ALLOW_ONELEVEL)) {
 				if (!refname_is_safe(refname.buf))
 					die("loose refname is dangerous: %s", refname.buf);
-				hashclr(sha1);
+				oidclr(&oid);
 				flag |= REF_BAD_NAME | REF_ISBROKEN;
 			}
 			add_entry_to_dir(dir,
-					 create_ref_entry(refname.buf, sha1, flag, 0));
+					 create_ref_entry(refname.buf, &oid, flag, 0));
 		}
 		strbuf_setlen(&refname, dirnamelen);
 		strbuf_setlen(&path, path_baselen);
@@ -1526,7 +1514,7 @@ static int files_pack_refs(struct ref_store *ref_store, unsigned int flags)
 			packed_entry->flag = REF_ISPACKED;
 			oidcpy(&packed_entry->u.value.oid, iter->oid);
 		} else {
-			packed_entry = create_ref_entry(iter->refname, iter->oid->hash,
+			packed_entry = create_ref_entry(iter->refname, iter->oid,
 							REF_ISPACKED, 0);
 			add_ref_entry(packed_refs, packed_entry);
 		}
@@ -1709,10 +1697,10 @@ static int rename_tmp_log(struct files_ref_store *refs, const char *newrefname)
 }
 
 static int write_ref_to_lockfile(struct ref_lock *lock,
-				 const unsigned char *sha1, struct strbuf *err);
+				 const struct object_id *oid, struct strbuf *err);
 static int commit_ref_update(struct files_ref_store *refs,
 			     struct ref_lock *lock,
-			     const unsigned char *sha1, const char *logmsg,
+			     const struct object_id *oid, const char *logmsg,
 			     struct strbuf *err);
 
 static int files_rename_ref(struct ref_store *ref_store,
@@ -1721,7 +1709,7 @@ static int files_rename_ref(struct ref_store *ref_store,
 {
 	struct files_ref_store *refs =
 		files_downcast(ref_store, REF_STORE_WRITE, "rename_ref");
-	unsigned char sha1[20], orig_sha1[20];
+	struct object_id oid, orig_oid;
 	int flag = 0, logmoved = 0;
 	struct ref_lock *lock;
 	struct stat loginfo;
@@ -1743,7 +1731,7 @@ static int files_rename_ref(struct ref_store *ref_store,
 
 	if (!refs_resolve_ref_unsafe(&refs->base, oldrefname,
 				     RESOLVE_REF_READING | RESOLVE_REF_NO_RECURSE,
-				orig_sha1, &flag)) {
+				orig_oid.hash, &flag)) {
 		ret = error("refname %s not found", oldrefname);
 		goto out;
 	}
@@ -1765,21 +1753,21 @@ static int files_rename_ref(struct ref_store *ref_store,
 	}
 
 	if (refs_delete_ref(&refs->base, logmsg, oldrefname,
-			    orig_sha1, REF_NODEREF)) {
+			    orig_oid.hash, REF_NODEREF)) {
 		error("unable to delete old %s", oldrefname);
 		goto rollback;
 	}
 
 	/*
-	 * Since we are doing a shallow lookup, sha1 is not the
-	 * correct value to pass to delete_ref as old_sha1. But that
-	 * doesn't matter, because an old_sha1 check wouldn't add to
+	 * Since we are doing a shallow lookup, oid is not the
+	 * correct value to pass to delete_ref as old_oid. But that
+	 * doesn't matter, because an old_oid check wouldn't add to
 	 * the safety anyway; we want to delete the reference whatever
 	 * its current value.
 	 */
 	if (!refs_read_ref_full(&refs->base, newrefname,
 				RESOLVE_REF_READING | RESOLVE_REF_NO_RECURSE,
-				sha1, NULL) &&
+				oid.hash, NULL) &&
 	    refs_delete_ref(&refs->base, NULL, newrefname,
 			    NULL, REF_NODEREF)) {
 		if (errno == EISDIR) {
@@ -1812,10 +1800,10 @@ static int files_rename_ref(struct ref_store *ref_store,
 		strbuf_release(&err);
 		goto rollback;
 	}
-	hashcpy(lock->old_oid.hash, orig_sha1);
+	oidcpy(&lock->old_oid, &orig_oid);
 
-	if (write_ref_to_lockfile(lock, orig_sha1, &err) ||
-	    commit_ref_update(refs, lock, orig_sha1, logmsg, &err)) {
+	if (write_ref_to_lockfile(lock, &orig_oid, &err) ||
+	    commit_ref_update(refs, lock, &orig_oid, logmsg, &err)) {
 		error("unable to write current sha1 into %s: %s", newrefname, err.buf);
 		strbuf_release(&err);
 		goto rollback;
@@ -1835,8 +1823,8 @@ static int files_rename_ref(struct ref_store *ref_store,
 
 	flag = log_all_ref_updates;
 	log_all_ref_updates = LOG_REFS_NONE;
-	if (write_ref_to_lockfile(lock, orig_sha1, &err) ||
-	    commit_ref_update(refs, lock, orig_sha1, NULL, &err)) {
+	if (write_ref_to_lockfile(lock, &orig_oid, &err) ||
+	    commit_ref_update(refs, lock, &orig_oid, NULL, &err)) {
 		error("unable to write current sha1 into %s: %s", oldrefname, err.buf);
 		strbuf_release(&err);
 	}
@@ -1986,8 +1974,8 @@ static int files_create_reflog(struct ref_store *ref_store,
 	return 0;
 }
 
-static int log_ref_write_fd(int fd, const unsigned char *old_sha1,
-			    const unsigned char *new_sha1,
+static int log_ref_write_fd(int fd, const struct object_id *old_oid,
+			    const struct object_id *new_oid,
 			    const char *committer, const char *msg)
 {
 	int msglen, written;
@@ -1998,8 +1986,8 @@ static int log_ref_write_fd(int fd, const unsigned char *old_sha1,
 	maxlen = strlen(committer) + msglen + 100;
 	logrec = xmalloc(maxlen);
 	len = xsnprintf(logrec, maxlen, "%s %s %s\n",
-			sha1_to_hex(old_sha1),
-			sha1_to_hex(new_sha1),
+			oid_to_hex(old_oid),
+			oid_to_hex(new_oid),
 			committer);
 	if (msglen)
 		len += copy_reflog_msg(logrec + len - 1, msg) - 1;
@@ -2013,8 +2001,8 @@ static int log_ref_write_fd(int fd, const unsigned char *old_sha1,
 }
 
 static int files_log_ref_write(struct files_ref_store *refs,
-			       const char *refname, const unsigned char *old_sha1,
-			       const unsigned char *new_sha1, const char *msg,
+			       const char *refname, const struct object_id *old_oid,
+			       const struct object_id *new_oid, const char *msg,
 			       int flags, struct strbuf *err)
 {
 	int logfd, result;
@@ -2031,7 +2019,7 @@ static int files_log_ref_write(struct files_ref_store *refs,
 
 	if (logfd < 0)
 		return 0;
-	result = log_ref_write_fd(logfd, old_sha1, new_sha1,
+	result = log_ref_write_fd(logfd, old_oid, new_oid,
 				  git_committer_info(0), msg);
 	if (result) {
 		struct strbuf sb = STRBUF_INIT;
@@ -2063,29 +2051,29 @@ static int files_log_ref_write(struct files_ref_store *refs,
  * return -1.
  */
 static int write_ref_to_lockfile(struct ref_lock *lock,
-				 const unsigned char *sha1, struct strbuf *err)
+				 const struct object_id *oid, struct strbuf *err)
 {
 	static char term = '\n';
 	struct object *o;
 	int fd;
 
-	o = parse_object(sha1);
+	o = parse_object(oid);
 	if (!o) {
 		strbuf_addf(err,
 			    "trying to write ref '%s' with nonexistent object %s",
-			    lock->ref_name, sha1_to_hex(sha1));
+			    lock->ref_name, oid_to_hex(oid));
 		unlock_ref(lock);
 		return -1;
 	}
 	if (o->type != OBJ_COMMIT && is_branch(lock->ref_name)) {
 		strbuf_addf(err,
 			    "trying to write non-commit object %s to branch '%s'",
-			    sha1_to_hex(sha1), lock->ref_name);
+			    oid_to_hex(oid), lock->ref_name);
 		unlock_ref(lock);
 		return -1;
 	}
 	fd = get_lock_file_fd(lock->lk);
-	if (write_in_full(fd, sha1_to_hex(sha1), 40) != 40 ||
+	if (write_in_full(fd, oid_to_hex(oid), GIT_SHA1_HEXSZ) != GIT_SHA1_HEXSZ ||
 	    write_in_full(fd, &term, 1) != 1 ||
 	    close_ref(lock) < 0) {
 		strbuf_addf(err,
@@ -2103,14 +2091,14 @@ static int write_ref_to_lockfile(struct ref_lock *lock,
  */
 static int commit_ref_update(struct files_ref_store *refs,
 			     struct ref_lock *lock,
-			     const unsigned char *sha1, const char *logmsg,
+			     const struct object_id *oid, const char *logmsg,
 			     struct strbuf *err)
 {
 	files_assert_main_repository(refs, "commit_ref_update");
 
 	clear_loose_ref_cache(refs);
 	if (files_log_ref_write(refs, lock->ref_name,
-				lock->old_oid.hash, sha1,
+				&lock->old_oid, oid,
 				logmsg, 0, err)) {
 		char *old_msg = strbuf_detach(err, NULL);
 		strbuf_addf(err, "cannot update the ref '%s': %s",
@@ -2133,18 +2121,18 @@ static int commit_ref_update(struct files_ref_store *refs,
 		 * check with HEAD only which should cover 99% of all usage
 		 * scenarios (even 100% of the default ones).
 		 */
-		unsigned char head_sha1[20];
+		struct object_id head_oid;
 		int head_flag;
 		const char *head_ref;
 
 		head_ref = refs_resolve_ref_unsafe(&refs->base, "HEAD",
 						   RESOLVE_REF_READING,
-						   head_sha1, &head_flag);
+						   head_oid.hash, &head_flag);
 		if (head_ref && (head_flag & REF_ISSYMREF) &&
 		    !strcmp(head_ref, lock->ref_name)) {
 			struct strbuf log_err = STRBUF_INIT;
 			if (files_log_ref_write(refs, "HEAD",
-						lock->old_oid.hash, sha1,
+						&lock->old_oid, oid,
 						logmsg, 0, &log_err)) {
 				error("%s", log_err.buf);
 				strbuf_release(&log_err);
@@ -2182,12 +2170,12 @@ static void update_symref_reflog(struct files_ref_store *refs,
 				 const char *target, const char *logmsg)
 {
 	struct strbuf err = STRBUF_INIT;
-	unsigned char new_sha1[20];
+	struct object_id new_oid;
 	if (logmsg &&
 	    !refs_read_ref_full(&refs->base, target,
-				RESOLVE_REF_READING, new_sha1, NULL) &&
-	    files_log_ref_write(refs, refname, lock->old_oid.hash,
-				new_sha1, logmsg, 0, &err)) {
+				RESOLVE_REF_READING, new_oid.hash, NULL) &&
+	    files_log_ref_write(refs, refname, &lock->old_oid,
+				&new_oid, logmsg, 0, &err)) {
 		error("%s", err.buf);
 		strbuf_release(&err);
 	}
@@ -2589,7 +2577,7 @@ static int split_head_update(struct ref_update *update,
 	new_update = ref_transaction_add_update(
 			transaction, "HEAD",
 			update->flags | REF_LOG_ONLY | REF_NODEREF,
-			update->new_sha1, update->old_sha1,
+			update->new_oid.hash, update->old_oid.hash,
 			update->msg);
 
 	item->util = new_update;
@@ -2646,7 +2634,7 @@ static int split_symref_update(struct files_ref_store *refs,
 
 	new_update = ref_transaction_add_update(
 			transaction, referent, new_flags,
-			update->new_sha1, update->old_sha1,
+			update->new_oid.hash, update->old_oid.hash,
 			update->msg);
 
 	new_update->parent_update = update;
@@ -2685,10 +2673,10 @@ static int check_old_oid(struct ref_update *update, struct object_id *oid,
 			 struct strbuf *err)
 {
 	if (!(update->flags & REF_HAVE_OLD) ||
-		   !hashcmp(oid->hash, update->old_sha1))
+		   !oidcmp(oid, &update->old_oid))
 		return 0;
 
-	if (is_null_sha1(update->old_sha1))
+	if (is_null_oid(&update->old_oid))
 		strbuf_addf(err, "cannot lock ref '%s': "
 			    "reference already exists",
 			    original_update_refname(update));
@@ -2696,13 +2684,13 @@ static int check_old_oid(struct ref_update *update, struct object_id *oid,
 		strbuf_addf(err, "cannot lock ref '%s': "
 			    "reference is missing but expected %s",
 			    original_update_refname(update),
-			    sha1_to_hex(update->old_sha1));
+			    oid_to_hex(&update->old_oid));
 	else
 		strbuf_addf(err, "cannot lock ref '%s': "
 			    "is at %s but expected %s",
 			    original_update_refname(update),
 			    oid_to_hex(oid),
-			    sha1_to_hex(update->old_sha1));
+			    oid_to_hex(&update->old_oid));
 
 	return -1;
 }
@@ -2729,13 +2717,13 @@ static int lock_ref_for_update(struct files_ref_store *refs,
 {
 	struct strbuf referent = STRBUF_INIT;
 	int mustexist = (update->flags & REF_HAVE_OLD) &&
-		!is_null_sha1(update->old_sha1);
+		!is_null_oid(&update->old_oid);
 	int ret;
 	struct ref_lock *lock;
 
 	files_assert_main_repository(refs, "lock_ref_for_update");
 
-	if ((update->flags & REF_HAVE_NEW) && is_null_sha1(update->new_sha1))
+	if ((update->flags & REF_HAVE_NEW) && is_null_oid(&update->new_oid))
 		update->flags |= REF_DELETING;
 
 	if (head_ref) {
@@ -2817,12 +2805,12 @@ static int lock_ref_for_update(struct files_ref_store *refs,
 	    !(update->flags & REF_DELETING) &&
 	    !(update->flags & REF_LOG_ONLY)) {
 		if (!(update->type & REF_ISSYMREF) &&
-		    !hashcmp(lock->old_oid.hash, update->new_sha1)) {
+		    !oidcmp(&lock->old_oid, &update->new_oid)) {
 			/*
 			 * The reference already has the desired
 			 * value, so we don't need to write it.
 			 */
-		} else if (write_ref_to_lockfile(lock, update->new_sha1,
+		} else if (write_ref_to_lockfile(lock, &update->new_oid,
 						 err)) {
 			char *write_err = strbuf_detach(err, NULL);
 
@@ -2957,8 +2945,8 @@ static int files_transaction_commit(struct ref_store *ref_store,
 		    update->flags & REF_LOG_ONLY) {
 			if (files_log_ref_write(refs,
 						lock->ref_name,
-						lock->old_oid.hash,
-						update->new_sha1,
+						&lock->old_oid,
+						&update->new_oid,
 						update->msg, update->flags,
 						err)) {
 				char *old_msg = strbuf_detach(err, NULL);
@@ -3107,7 +3095,7 @@ static int files_initial_transaction_commit(struct ref_store *ref_store,
 		struct ref_update *update = transaction->updates[i];
 
 		if ((update->flags & REF_HAVE_OLD) &&
-		    !is_null_sha1(update->old_sha1))
+		    !is_null_oid(&update->old_oid))
 			die("BUG: initial ref transaction with old_sha1 set");
 		if (refs_verify_refname_available(&refs->base, update->refname,
 						  &affected_refnames, NULL,
@@ -3128,8 +3116,9 @@ static int files_initial_transaction_commit(struct ref_store *ref_store,
 		struct ref_update *update = transaction->updates[i];
 
 		if ((update->flags & REF_HAVE_NEW) &&
-		    !is_null_sha1(update->new_sha1))
-			add_packed_ref(refs, update->refname, update->new_sha1);
+		    !is_null_oid(&update->new_oid))
+			add_packed_ref(refs, update->refname,
+				       &update->new_oid);
 	}
 
 	if (commit_packed_refs(refs)) {
@@ -3163,7 +3152,7 @@ static int expire_reflog_ent(struct object_id *ooid, struct object_id *noid,
 	if (cb->flags & EXPIRE_REFLOGS_REWRITE)
 		ooid = &cb->last_kept_oid;
 
-	if ((*cb->should_prune_fn)(ooid->hash, noid->hash, email, timestamp, tz,
+	if ((*cb->should_prune_fn)(ooid, noid, email, timestamp, tz,
 				   message, policy_cb)) {
 		if (!cb->newlog)
 			printf("would prune %s", message);
@@ -3200,6 +3189,7 @@ static int files_reflog_expire(struct ref_store *ref_store,
 	int status = 0;
 	int type;
 	struct strbuf err = STRBUF_INIT;
+	struct object_id oid;
 
 	memset(&cb, 0, sizeof(cb));
 	cb.flags = flags;
@@ -3249,7 +3239,9 @@ static int files_reflog_expire(struct ref_store *ref_store,
 		}
 	}
 
-	(*prepare_fn)(refname, sha1, cb.policy_cb);
+	hashcpy(oid.hash, sha1);
+
+	(*prepare_fn)(refname, &oid, cb.policy_cb);
 	refs_for_each_reflog_ent(ref_store, refname, expire_reflog_ent, &cb);
 	(*cleanup_fn)(cb.policy_cb);
 
diff --git a/refs/ref-cache.c b/refs/ref-cache.c
index 6059362f1d..6b11d9cd12 100644
--- a/refs/ref-cache.c
+++ b/refs/ref-cache.c
@@ -32,7 +32,7 @@ struct ref_dir *get_ref_dir(struct ref_entry *entry)
 }
 
 struct ref_entry *create_ref_entry(const char *refname,
-				   const unsigned char *sha1, int flag,
+				   const struct object_id *oid, int flag,
 				   int check_name)
 {
 	struct ref_entry *ref;
@@ -41,7 +41,7 @@ struct ref_entry *create_ref_entry(const char *refname,
 	    check_refname_format(refname, REFNAME_ALLOW_ONELEVEL))
 		die("Reference has invalid format: '%s'", refname);
 	FLEX_ALLOC_STR(ref, name, refname);
-	hashcpy(ref->u.value.oid.hash, sha1);
+	oidcpy(&ref->u.value.oid, oid);
 	oidclr(&ref->u.value.peeled);
 	ref->flag = flag;
 	return ref;
diff --git a/refs/ref-cache.h b/refs/ref-cache.h
index ffdc54f3f0..1f65e2f9ed 100644
--- a/refs/ref-cache.h
+++ b/refs/ref-cache.h
@@ -185,7 +185,7 @@ struct ref_entry *create_dir_entry(struct ref_cache *cache,
 				   int incomplete);
 
 struct ref_entry *create_ref_entry(const char *refname,
-				   const unsigned char *sha1, int flag,
+				   const struct object_id *oid, int flag,
 				   int check_name);
 
 /*
diff --git a/refs/refs-internal.h b/refs/refs-internal.h
index 12cf4e4718..b6b291cf00 100644
--- a/refs/refs-internal.h
+++ b/refs/refs-internal.h
@@ -130,13 +130,13 @@ struct ref_update {
 	/*
 	 * If (flags & REF_HAVE_NEW), set the reference to this value:
 	 */
-	unsigned char new_sha1[20];
+	struct object_id new_oid;
 
 	/*
 	 * If (flags & REF_HAVE_OLD), check that the reference
 	 * previously had this value:
 	 */
-	unsigned char old_sha1[20];
+	struct object_id old_oid;
 
 	/*
 	 * One or more of REF_HAVE_NEW, REF_HAVE_OLD, REF_NODEREF,