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>

5 files changed, 49 insertions, 37 deletions

diff --git a/fetch.c b/fetch.c
index 3255cc625..281df61e7 100644
--- a/fetch.c
+++ b/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;
 }
diff --git a/fetch.h b/fetch.h
index 7bda355bc..75e48af78 100644
--- a/fetch.h
+++ b/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 */
diff --git a/http-fetch.c b/http-fetch.c
index 963d439f8..bc67db1ad 100644
--- a/http-fetch.c
+++ b/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();
diff --git a/local-fetch.c b/local-fetch.c
index 452b83396..1be73904f 100644
--- a/local-fetch.c
+++ b/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;
diff --git a/ssh-fetch.c b/ssh-fetch.c
index aef3aa4a0..6e16568f8 100644
--- a/ssh-fetch.c
+++ b/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;