run-init: if doing dry run, do not require pid==1

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>

diff --git a/util-linux/switch_root.c b/util-linux/switch_root.c
index 16abcb634fe60d92670a3961acde603a7ebd036e..080b05e45a327eb7d0c7a44d45e3c2a75fbe286d 100644 (file)
--- a/util-linux/switch_root.c
+++ b/util-linux/switch_root.c
@@ -227,9 +227,12 @@ int switch_root_main(int argc UNUSED_PARAM, char **argv)
        xstat("/", &st);
        rootdev = st.st_dev;
        xstat(".", &st);
-       if (st.st_dev == rootdev || getpid() != 1) {
+       if (st.st_dev == rootdev) {
                // Show usage, it says new root must be a mountpoint
-               // and we must be PID 1
+               bb_show_usage();
+       }
+       if (!dry_run && getpid() != 1) {
+               // Show usage, it says we must be PID 1
                bb_show_usage();
        }