From 986d1b87acc98649003051116b77a19493ab34d7 Mon Sep 17 00:00:00 2001
From: unknown author <cooker@mandrivalinux.org>
Date: Mon, 15 Jun 2009 17:35:40 +0200
Subject: [PATCH] checkroot

---
 nash/nash.c |    9 +++++++++
 1 files changed, 9 insertions(+), 0 deletions(-)

diff --git a/nash/nash.c b/nash/nash.c
index 3aab14c..aec04e9 100644
--- a/nash/nash.c
+++ b/nash/nash.c
@@ -1205,6 +1205,7 @@ switchrootCommand(char * cmd, char * end)
                                 "/bin/init", "/bin/sh", NULL };
     const char *ignoreargs[] = { "console=", "BOOT_IMAGE=", NULL };
     char *init, **initargs;
+    char *newdev;
     char *cmdline = NULL;
     char *new = NULL, *arg;
     int fd, i = 0, j = 0;
@@ -1225,6 +1226,14 @@ switchrootCommand(char * cmd, char * end)
     if (new == NULL)
         new = "/sysroot";
 
+    asprintf(&newdev, "%s/dev", new);
+    if (access(newdev, R_OK)) {
+        free(newdev);
+        eprintf("switchroot: /dev does not exist in new root\n");
+        return 1;
+    }
+    free(newdev);
+
     /* this has to happen before we unmount /proc */
     init = getKernelArg("init");
     if (init == NULL)
-- 
1.7.1