[PATCH 2/4] Generic support for pulling refs

@@ -98,6 +98,11 @@
 	return 0;
 }
 
+int fetch_ref(char *dir, char *name, unsigned char *sha1)
+{
+	return -1;
+}
+
 int main(int argc, char **argv)
 {
 	char *commit_id;

@@ -18,6 +18,11 @@
 
 static char *path;
 
+int fetch_ref(char *dir, char *name, unsigned char *sha1)
+{
+	return -1;
+}
+
 int fetch(unsigned char *sha1)
 {
 	static int object_name_start = -1;

@@ -3,6 +3,12 @@
 #include "cache.h"
 #include "commit.h"
 #include "tree.h"
+#include "tag.h"
+
+#include "refs.h"
+
+char *write_ref_dir = NULL;
+char *write_ref_name = NULL;
 
 int get_tree = 0;
 int get_history = 0;

@@ -98,16 +104,52 @@
 	return 0;
 }
 
+static int process_tag(unsigned char *sha1)
+{
+	return 0;
+}
+
+static int process_unknown(unsigned char *sha1)
+{
+	struct object *obj;
+	if (make_sure_we_have_it(NULL, sha1))
+		return -1;
+	obj = parse_object(sha1);
+	if (obj->type == commit_type) {
+		memcpy(current_commit_sha1, sha1, 20);
+		return process_commit(sha1);
+	} else if (obj->type == tag_type)
+		return process_tag(sha1);
+	return error("Cannot pull a %s object", obj->type);
+}
+
+static int interpret_target(char *target, unsigned char *sha1)
+{
+	char *dir, *name;
+	if (!get_sha1_hex(target, sha1))
+		return 0;
+	if (!split_ref(&dir, &name, target)) {
+		if (!fetch_ref(dir, name, sha1)) {
+			return 0;
+		}
+	}
+	return -1;
+}
+
 int pull(char *target)
 {
 	int retval;
 	unsigned char sha1[20];
-	retval = get_sha1_hex(target, sha1);
-	if (retval)
-		return retval;
-	retval = make_sure_we_have_it(commitS, sha1);
+	retval = interpret_target(target, sha1);
+	if (retval) {
+		return error("Could not interpret %s as something to pull",
+			     target);
+	}
+	retval = process_unknown(sha1);
 	if (retval)
 		return retval;
-	memcpy(current_commit_sha1, sha1, 20);
-	return process_commit(sha1);
+
+	if (write_ref_dir && write_ref_name)
+		write_split_ref_sha1(write_ref_dir, write_ref_name, sha1);
+	return 0;
 }

@@ -4,6 +4,12 @@
 /** To be provided by the particular implementation. **/
 extern int fetch(unsigned char *sha1);
 
+extern int fetch_ref(char *dir, char *name, unsigned char *sha1);
+
+/** Ref filename to write target to. **/
+extern char *write_ref_dir;
+extern char *write_ref_name;
+
 /** Set to fetch the target tree. */
 extern int get_tree;
 

@@ -22,6 +22,11 @@
 	return ret;
 }
 
+int fetch_ref(char *dir, char *name, unsigned char *sha1)
+{
+	return -1;
+}
+
 int main(int argc, char **argv)
 {
 	char *commit_id;