fstools: allow to stack another overlay on top of existing one

`mount_root ram' will pivot existing root to ram even if it was
overlayfs already. Useful when playing with new configurations
as it allows to preserve existing/stable configuration.

Signed-off-by: Roman Yeryomin <roman@advem.lv>

diff --git a/mount_root.c b/mount_root.c
index 7b69c7f..bf70265 100644 (file)
--- a/mount_root.c
+++ b/mount_root.c
@@ -117,6 +117,8 @@ int main(int argc, char **argv)
 {
        if (argc < 2)
                return start(argc, argv);
+       if (!strcmp(argv[1], "ram"))
+               return ramoverlay();
        if (!strcmp(argv[1], "stop"))
                return stop(argc, argv);
        if (!strcmp(argv[1], "done"))