X-Git-Url: https://git.verplant.org/?a=blobdiff_plain;f=commit.c;h=e83056406f54495fe8a1090a816c425375858d4d;hb=de809dbbce497e0d107562615c1d85ff35b4e0c5;hp=706c7cba08ebc2100c2dbf63ed1238f39324f750;hpb=bd2c39f58f915af532b488c5bda753314f0db603;p=git.git

diff --git a/commit.c b/commit.c
index 706c7cba..e8305640 100644
--- a/commit.c
+++ b/commit.c
@@ -1,3 +1,4 @@
+#include "tag.h"
 #include "commit.h"
 #include "cache.h"
 #include <string.h>
@@ -5,6 +6,27 @@
 
 const char *commit_type = "commit";
 
+static struct commit *check_commit(struct object *obj, unsigned char *sha1)
+{
+	if (obj->type != commit_type) {
+		error("Object %s is a %s, not a commit", 
+		      sha1_to_hex(sha1), obj->type);
+		return NULL;
+	}
+	return (struct commit *) obj;
+}
+
+struct commit *lookup_commit_reference(unsigned char *sha1)
+{
+	struct object *obj = parse_object(sha1);
+
+	if (!obj)
+		return NULL;
+	if (obj->type == tag_type)
+		obj = ((struct tag *)obj)->tagged;
+	return check_commit(obj, sha1);
+}
+
 struct commit *lookup_commit(unsigned char *sha1)
 {
 	struct object *obj = lookup_object(sha1);
@@ -15,12 +37,7 @@ struct commit *lookup_commit(unsigned char *sha1)
 		ret->object.type = commit_type;
 		return ret;
 	}
-	if (obj->type != commit_type) {
-		error("Object %s is a %s, not a commit", 
-		      sha1_to_hex(sha1), obj->type);
-		return NULL;
-	}
-	return (struct commit *) obj;
+	return check_commit(obj, sha1);
 }
 
 static unsigned long parse_commit_date(const char *buf)