release/src/router/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
  27 int chroot_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
  28 int 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 }