LXR busybox/coreutils/chroot.c

   1/* vi: set sw=4 ts=4: */
   2/*
   3 * Mini chroot implementation for busybox
   4 *
   5 * Copyright (C) 1999-2004 by Erik Andersen <andersen@codepoet.org>
   6 *
   7 * Licensed under GPLv2 or later, see file LICENSE in this source tree.
   8 */
   9
  10/* BB_AUDIT SUSv3 N/A -- Matches GNU behavior. */
  11
  12//usage:#define chroot_trivial_usage
  13//usage:       "NEWROOT [PROG ARGS]"
  14//usage:#define chroot_full_usage "\n\n"
  15//usage:       "Run PROG with root directory set to NEWROOT"
  16//usage:
  17//usage:#define chroot_example_usage
  18//usage:       "$ ls -l /bin/ls\n"
  19//usage:       "lrwxrwxrwx    1 root     root          12 Apr 13 00:46 /bin/ls -> /BusyBox\n"
  20//usage:       "# mount /dev/hdc1 /mnt -t minix\n"
  21//usage:       "# chroot /mnt\n"
  22//usage:       "# ls -l /bin/ls\n"
  23//usage:       "-rwxr-xr-x    1 root     root        40816 Feb  5 07:45 /bin/ls*\n"
  24
  25#include "libbb.h"
  26
  27int chroot_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
  28int chroot_main(int argc UNUSED_PARAM, char **argv)
  29{
  30        ++argv;
  31        if (!*argv)
  32                bb_show_usage();
  33        xchroot(*argv);
  34
  35        ++argv;
  36        if (!*argv) { /* no 2nd param (PROG), use shell */
  37                argv -= 2;
  38                argv[0] = (char *) get_shell_name();
  39                argv[1] = (char *) "-i"; /* GNU coreutils 8.4 compat */
  40                /*argv[2] = NULL; - already is */
  41        }
  42
  43        BB_EXECVP_or_die(argv);
  44}
  45