git-send-pack: add "--all" option to send all refs to the other side

This affects only refs that the other side doesn't already have. The
ones it has are still filtered by the ref selection.

send-pack.c

@@ -5,6 +5,7 @@
 static const char send_pack_usage[] =
 "git-send-pack [--exec=git-receive-pack] [host:]directory [heads]*";
 static const char *exec = "git-receive-pack";
+static int send_all = 0;
 
 struct ref {
 	struct ref *next;
@@ -137,15 +138,24 @@ static int ref_newer(const unsigned char *new_sha1, const unsigned char *old_sha
 
 static int local_ref_nr_match;
 static char **local_ref_match;
-static struct ref **local_ref_list;
+static struct ref *local_ref_list;
+static struct ref **local_last_ref;
 
 static int try_to_match(const char *refname, const unsigned char *sha1)
 {
 	struct ref *ref;
 	int len;
 
-	if (!path_match(refname, local_ref_nr_match, local_ref_match))
-		return 0;
+	if (!path_match(refname, local_ref_nr_match, local_ref_match)) {
+		if (!send_all)
+			return 0;
+
+		/* If we have it listed already, skip it */
+		for (ref = local_ref_list ; ref ; ref = ref->next) {
+			if (!strcmp(ref->name, refname))
+				return 0;
+		}
+	}
 
 	len = strlen(refname)+1;
 	ref = xmalloc(sizeof(*ref) + len);
@@ -153,8 +163,8 @@ static int try_to_match(const char *refname, const unsigned char *sha1)
 	memcpy(ref->new_sha1, sha1, 20);
 	memcpy(ref->name, refname, len);
 	ref->next = NULL;
-	*local_ref_list = ref;
-	local_ref_list = &ref->next;
+	*local_last_ref = ref;
+	local_last_ref = &ref->next;
 	return 0;
 }
 
@@ -225,7 +235,8 @@ static int send_pack(int in, int out, int nr_match, char **match)
 	if (nr_match) {
 		local_ref_nr_match = nr_match;
 		local_ref_match = match;
-		local_ref_list = last_ref;
+		local_ref_list = ref_list;
+		local_last_ref = last_ref;
 		for_each_ref(try_to_match);
 	}
 
@@ -260,19 +271,26 @@ int main(int argc, char **argv)
 	pid_t pid;
 
 	argv++;
-	for (i = 1; i < argc; i++) {
-		char *arg = *argv++;
+	for (i = 1; i < argc; i++, argv++) {
+		char *arg = *argv;
 
 		if (*arg == '-') {
 			if (!strncmp(arg, "--exec=", 7)) {
 				exec = arg + 7;
 				continue;
 			}
+			if (!strcmp(arg, "--all")) {
+				send_all = 1;
+				continue;
+			}
 			usage(send_pack_usage);
 		}
-		dest = arg;
+		if (!dest) {
+			dest = arg;
+			continue;
+		}
 		heads = argv;
-		nr_heads = argc - i -1;
+		nr_heads = argc - i;
 		break;
 	}
 	if (!dest)