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diff -wur busybox-1.11.0/util-linux/switch_root.c busybox-1.11.0-patched/util-linux/switch_root.c
--- busybox-1.11.0/util-linux/switch_root.c 2008-06-25 14:51:38.000000000 +0200
+++ busybox-1.11.0-patched/util-linux/switch_root.c 2008-07-10 17:54:56.000000000 +0200
@@ -105,6 +105,10 @@
// Overmount / with newdir and chroot into it. The chdir is needed to
// recalculate "." and ".." links.
+ if ( !lstat("/rorootfs", &st1 ) )
+ if ( mount("/rorootfs", "/", NULL, MS_MOVE, NULL) )
+ bb_error_msg_and_die("moving rorootfs");
+
if (mount(".", "/", NULL, MS_MOVE, NULL))
bb_error_msg_and_die("error moving root");
xchroot(".");
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