Make pull() support fetching multiple targets at once

pull() now takes an array of arguments instead of just one of each kind.
Currently, no users use the new capability, but that'll change.

Signed-off-by: Petr Baudis <pasky@suse.cz>
Signed-off-by: Junio C Hamano <junkio@cox.net>

fetch.c

@@ -210,55 +210,67 @@ static int mark_complete(const char *path, const unsigned char *sha1)
 	return 0;
 }
 
-int pull(char *target, const char *write_ref,
+int pull(int targets, char **target, const char **write_ref,
          const char *write_ref_log_details)
 {
-	struct ref_lock *lock = NULL;
-	unsigned char sha1[20];
+	struct ref_lock **lock = xcalloc(targets, sizeof(struct ref_lock *));
+	unsigned char *sha1 = xmalloc(targets * 20);
 	char *msg;
 	int ret;
+	int i;
 
 	save_commit_buffer = 0;
 	track_object_refs = 0;
-	if (write_ref) {
-		lock = lock_ref_sha1(write_ref, NULL, 0);
-		if (!lock) {
-			error("Can't lock ref %s", write_ref);
-			return -1;
+
+	for (i = 0; i < targets; i++) {
+		if (!write_ref[i])
+			continue;
+
+		lock[i] = lock_ref_sha1(write_ref[i], NULL, 0);
+		if (!lock[i]) {
+			error("Can't lock ref %s", write_ref[i]);
+			goto unlock_and_fail;
 		}
 	}
 
 	if (!get_recover)
 		for_each_ref(mark_complete);
 
-	if (interpret_target(target, sha1)) {
-		error("Could not interpret %s as something to pull", target);
-		if (lock)
-			unlock_ref(lock);
-		return -1;
+	for (i = 0; i < targets; i++) {
+		if (interpret_target(target[i], &sha1[20 * i])) {
+			error("Could not interpret %s as something to pull", target[i]);
+			goto unlock_and_fail;
+		}
+		if (process(lookup_unknown_object(&sha1[20 * i])))
+			goto unlock_and_fail;
 	}
-	if (process(lookup_unknown_object(sha1))) {
-		if (lock)
-			unlock_ref(lock);
-		return -1;
+
+	if (loop())
+		goto unlock_and_fail;
+
+	if (write_ref_log_details) {
+		msg = xmalloc(strlen(write_ref_log_details) + 12);
+		sprintf(msg, "fetch from %s", write_ref_log_details);
+	} else {
+		msg = NULL;
 	}
-	if (loop()) {
-		if (lock)
-			unlock_ref(lock);
-		return -1;
+	for (i = 0; i < targets; i++) {
+		if (!write_ref[i])
+			continue;
+		ret = write_ref_sha1(lock[i], &sha1[20 * i], msg ? msg : "fetch (unknown)");
+		lock[i] = NULL;
+		if (ret)
+			goto unlock_and_fail;
 	}
+	if (msg)
+		free(msg);
 
-	if (write_ref) {
-		if (write_ref_log_details) {
-			msg = xmalloc(strlen(write_ref_log_details) + 12);
-			sprintf(msg, "fetch from %s", write_ref_log_details);
-		}
-		else
-			msg = NULL;
-		ret = write_ref_sha1(lock, sha1, msg ? msg : "fetch (unknown)");
-		if (msg)
-			free(msg);
-		return ret;
-	}
 	return 0;
+
+
+unlock_and_fail:
+	for (i = 0; i < targets; i++)
+		if (lock[i])
+			unlock_ref(lock[i]);
+	return -1;
 }

fetch.h

@@ -42,7 +42,7 @@ extern void pull_say(const char *, const char *);
 
 /* If write_ref is set, the ref filename to write the target value to. */
 /* If write_ref_log_details is set, additional text will appear in the ref log. */
-extern int pull(char *target, const char *write_ref,
+extern int pull(int targets, char **target, const char **write_ref,
 		const char *write_ref_log_details);
 
 #endif /* PULL_H */

http-fetch.c

@@ -1268,7 +1268,7 @@ int main(int argc, char **argv)
 			alt->path_len = strlen(path);
 	}
 
-	if (pull(commit_id, write_ref, url))
+	if (pull(1, &commit_id, &write_ref, url))
 		rc = 1;
 
 	http_cleanup();

local-fetch.c

@@ -242,7 +242,7 @@ int main(int argc, char **argv)
 	commit_id = argv[arg];
 	path = argv[arg + 1];
 
-	if (pull(commit_id, write_ref, path))
+	if (pull(1, &commit_id, &write_ref, path))
 		return 1;
 
 	return 0;

ssh-fetch.c

@@ -167,7 +167,7 @@ int main(int argc, char **argv)
 	if (get_version())
 		return 1;
 
-	if (pull(commit_id, write_ref, url))
+	if (pull(1, &commit_id, &write_ref, url))
 		return 1;
 
 	return 0;