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

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

1 files changed, 5 insertions, 2 deletions

diff --git a/util-linux/switch_root.c b/util-linux/switch_root.c
index 16abcb634..080b05e45 100644
--- 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();
         }