blob: 9bdae506cffed8615fdaf424fe1a0379477e3492 [file] [log] [blame]
/* vi: set sw=4 ts=4: */
* pivot_root.c - Change root file system. Based on util-linux 2.10s
* busyboxed by Evin Robertson
* pivot_root syscall stubbed by Erik Andersen, so it will compile
* regardless of the kernel being used.
* Licensed under GPLv2, see file LICENSE in this source tree.
//config:config PIVOT_ROOT
//config: bool "pivot_root"
//config: default y
//config: select PLATFORM_LINUX
//config: help
//config: The pivot_root utility swaps the mount points for the root filesystem
//config: with some other mounted filesystem. This allows you to do all sorts
//config: of wild and crazy things with your Linux system and is far more
//config: powerful than 'chroot'.
//config: Note: This is for initrd in linux 2.4. Under initramfs (introduced
//config: in linux 2.6) use switch_root instead.
//kbuild:lib-$(CONFIG_PIVOT_ROOT) += pivot_root.o
//usage:#define pivot_root_trivial_usage
//usage: "NEW_ROOT PUT_OLD"
//usage:#define pivot_root_full_usage "\n\n"
//usage: "Move the current root file system to PUT_OLD and make NEW_ROOT\n"
//usage: "the new root file system"
#include "libbb.h"
extern int pivot_root(const char * new_root,const char * put_old);
int pivot_root_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
int pivot_root_main(int argc, char **argv)
if (argc != 3)
if (pivot_root(argv[1], argv[2]) < 0) {
/* prints "pivot_root: <strerror text>" */