storage: add lxc_storage_get_path()

src/lxc/bdev/bdev.c

@@ -609,3 +609,14 @@ bool rootfs_is_blockdev(struct lxc_conf *conf)
 
 	return false;
 }
+
+char *lxc_storage_get_path(char *src, const char *prefix)
+{
+	size_t prefix_len;
+
+	prefix_len = strlen(prefix);
+	if (!strncmp(src, prefix, prefix_len) && (*(src + prefix_len) == ':'))
+		return (src + prefix_len + 1);
+
+	return src;
+}

src/lxc/bdev/bdev.h

@@ -125,5 +125,6 @@ bool bdev_destroy(struct lxc_conf *conf);
 /* callback function to be used with userns_exec_1() */
 int bdev_destroy_wrapper(void *data);
 extern bool rootfs_is_blockdev(struct lxc_conf *conf);
+extern char *lxc_storage_get_path(char *src, const char *prefix);
 
 #endif // __LXC_BDEV_H