Convert remaining callers of resolve_refdup to object_id

There are a few leaf functions in various files that call
resolve_refdup.  Convert these functions to use struct object_id
internally to prepare for transitioning resolve_refdup itself.

Signed-off-by: brian m. carlson <sandals@crustytoothpaste.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
diff --git a/builtin/notes.c b/builtin/notes.c
index 5248a9b..8c569a4 100644
--- a/builtin/notes.c
+++ b/builtin/notes.c
@@ -693,7 +693,7 @@ static int merge_abort(struct notes_merge_options *o)
 static int merge_commit(struct notes_merge_options *o)
 {
 	struct strbuf msg = STRBUF_INIT;
-	unsigned char sha1[20], parent_sha1[20];
+	struct object_id oid, parent_oid;
 	struct notes_tree *t;
 	struct commit *partial;
 	struct pretty_print_context pretty_ctx;
@@ -705,27 +705,27 @@ static int merge_commit(struct notes_merge_options *o)
 	 * and target notes ref from .git/NOTES_MERGE_REF.
 	 */
 
-	if (get_sha1("NOTES_MERGE_PARTIAL", sha1))
+	if (get_oid("NOTES_MERGE_PARTIAL", &oid))
 		die(_("failed to read ref NOTES_MERGE_PARTIAL"));
-	else if (!(partial = lookup_commit_reference(sha1)))
+	else if (!(partial = lookup_commit_reference(oid.hash)))
 		die(_("could not find commit from NOTES_MERGE_PARTIAL."));
 	else if (parse_commit(partial))
 		die(_("could not parse commit from NOTES_MERGE_PARTIAL."));
 
 	if (partial->parents)
-		hashcpy(parent_sha1, partial->parents->item->object.oid.hash);
+		oidcpy(&parent_oid, &partial->parents->item->object.oid);
 	else
-		hashclr(parent_sha1);
+		oidclr(&parent_oid);
 
 	t = xcalloc(1, sizeof(struct notes_tree));
 	init_notes(t, "NOTES_MERGE_PARTIAL", combine_notes_overwrite, 0);
 
 	o->local_ref = local_ref_to_free =
-		resolve_refdup("NOTES_MERGE_REF", 0, sha1, NULL);
+		resolve_refdup("NOTES_MERGE_REF", 0, oid.hash, NULL);
 	if (!o->local_ref)
 		die(_("failed to resolve NOTES_MERGE_REF"));
 
-	if (notes_merge_commit(o, t, partial, sha1))
+	if (notes_merge_commit(o, t, partial, oid.hash))
 		die(_("failed to finalize notes merge"));
 
 	/* Reuse existing commit message in reflog message */
@@ -733,8 +733,8 @@ static int merge_commit(struct notes_merge_options *o)
 	format_commit_message(partial, "%s", &msg, &pretty_ctx);
 	strbuf_trim(&msg);
 	strbuf_insert(&msg, 0, "notes: ", 7);
-	update_ref(msg.buf, o->local_ref, sha1,
-		   is_null_sha1(parent_sha1) ? NULL : parent_sha1,
+	update_ref(msg.buf, o->local_ref, oid.hash,
+		   is_null_oid(&parent_oid) ? NULL : parent_oid.hash,
 		   0, UPDATE_REFS_DIE_ON_ERR);
 
 	free_notes(t);