mirror of
https://git.busybox.net/busybox.git
synced 2024-11-27 07:33:26 +08:00
52 lines
1.6 KiB
C
52 lines
1.6 KiB
C
/* 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 (1.4 kb)"
|
|
//config: default y
|
|
//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:
|
|
//config: Note: This is for initrd in linux 2.4. Under initramfs (introduced
|
|
//config: in linux 2.6) use switch_root instead.
|
|
|
|
//applet:IF_PIVOT_ROOT(APPLET_NOFORK(pivot_root, pivot_root, BB_DIR_SBIN, BB_SUID_DROP, pivot_root))
|
|
|
|
//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)
|
|
bb_show_usage();
|
|
|
|
/* NOFORK applet. Hardly matters wrt performance, but code is trivial */
|
|
|
|
if (pivot_root(argv[1], argv[2]) < 0) {
|
|
/* prints "pivot_root: <strerror text>" */
|
|
bb_perror_nomsg_and_die();
|
|
}
|
|
|
|
return EXIT_SUCCESS;
|
|
}
|