[PATCH] clone-pack.c:write_one_ref() - Create leading directories.

The function write_one_ref() is passed the list of refs received
from the other end, which was obtained by directory traversal
under $GIT_DIR/refs; this can contain paths other than what
git-init-db prepares and would fail to clone when there is
such.

Signed-off-by: Junio C Hamano <junkio@cox.net>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

cache.h

@@ -161,6 +161,8 @@ extern void rollback_index_file(struct cache_file *);
 extern char *git_path(const char *fmt, ...);
 extern char *sha1_file_name(const unsigned char *sha1);
 
+int safe_create_leading_directories(char *path);
+
 /* Read and unpack a sha1 file into memory, write memory to a sha1 file */
 extern void * map_sha1_file(const unsigned char *sha1, unsigned long *size);
 extern int unpack_sha1_header(z_stream *stream, void *map, unsigned long mapsize, void *buffer, unsigned long size);

clone-pack.c

@@ -68,9 +68,12 @@ static int is_master(struct ref *ref)
 static void write_one_ref(struct ref *ref)
 {
 	char *path = git_path(ref->name);
-	int fd = open(path, O_CREAT | O_EXCL | O_WRONLY, 0666);
+	int fd;
 	char *hex;
 
+	if (safe_create_leading_directories(path))
+		die("unable to create leading directory for %s", ref->name);
+	fd = open(path, O_CREAT | O_EXCL | O_WRONLY, 0666);
 	if (fd < 0)
 		die("unable to create ref %s", ref->name);
 	hex = sha1_to_hex(ref->sha1);

sha1_file.c

@@ -130,6 +130,25 @@ char *git_path(const char *fmt, ...)
 	return ret;
 }
 
+int safe_create_leading_directories(char *path)
+{
+	char *pos = path;
+
+	while (pos) {
+		pos = strchr(pos, '/');
+		if (!pos)
+			break;
+		*pos = 0;
+		if (mkdir(path, 0777) < 0)
+			if (errno != EEXIST) {
+				*pos = '/';
+				return -1;
+			}
+		*pos++ = '/';
+	}
+	return 0;
+}
+
 int get_sha1(const char *str, unsigned char *sha1)
 {
 	static const char *prefix[] = {