Update menuconfig items with approximate applet sizes

[oweals/busybox.git] / coreutils / chroot.c

diff --git a/coreutils/chroot.c b/coreutils/chroot.c
index eeed01302d54afec6aa6df423dd38e272c5f48b8..6fa3a3f271487c31b22c498ee289b1af09690aed 100644 (file)
--- a/coreutils/chroot.c
+++ b/coreutils/chroot.c
@@ -2,52 +2,53 @@
 /*
  * Mini chroot implementation for busybox
  *
- * Copyright (C) 1999-2003 by Erik Andersen <andersen@codepoet.org>
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program; if not, write to the Free Software
- * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+ * Copyright (C) 1999-2004 by Erik Andersen <andersen@codepoet.org>
  *
+ * Licensed under GPLv2 or later, see file LICENSE in this source tree.
  */
+//config:config CHROOT
+//config:      bool "chroot (3.7 kb)"
+//config:      default y
+//config:      help
+//config:        chroot is used to change the root directory and run a command.
+//config:        The default command is `/bin/sh'.
+
+//applet:IF_CHROOT(APPLET(chroot, BB_DIR_USR_SBIN, BB_SUID_DROP))
+
+//kbuild:lib-$(CONFIG_CHROOT) += chroot.o
 
 /* BB_AUDIT SUSv3 N/A -- Matches GNU behavior. */
 
-#include <stdlib.h>
-#include <stdio.h>
-#include <unistd.h>
-#include <errno.h>
-#include "busybox.h"
+//usage:#define chroot_trivial_usage
+//usage:       "NEWROOT [PROG ARGS]"
+//usage:#define chroot_full_usage "\n\n"
+//usage:       "Run PROG with root directory set to NEWROOT"
+//usage:
+//usage:#define chroot_example_usage
+//usage:       "$ ls -l /bin/ls\n"
+//usage:       "lrwxrwxrwx    1 root     root          12 Apr 13 00:46 /bin/ls -> /BusyBox\n"
+//usage:       "# mount /dev/hdc1 /mnt -t minix\n"
+//usage:       "# chroot /mnt\n"
+//usage:       "# ls -l /bin/ls\n"
+//usage:       "-rwxr-xr-x    1 root     root        40816 Feb  5 07:45 /bin/ls*\n"
 
-int chroot_main(int argc, char **argv)
-{
-       if (argc < 2) {
-               bb_show_usage();
-       }
+#include "libbb.h"
 
+int chroot_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
+int chroot_main(int argc UNUSED_PARAM, char **argv)
+{
        ++argv;
-       if (chroot(*argv) || (chdir("/"))) {
-               bb_perror_msg_and_die("cannot change root directory to %s", *argv);
-       }
+       if (!*argv)
+               bb_show_usage();
+       xchroot(*argv);
 
        ++argv;
-       if (argc == 2) {
+       if (!*argv) { /* no 2nd param (PROG), use shell */
                argv -= 2;
-               if (!(*argv = getenv("SHELL"))) {
-                       *argv = (char *) DEFAULT_SHELL;
-               }
-               argv[1] = (char *) "-i";
+               argv[0] = (char *) get_shell_name();
+               argv[1] = (char *) "-i"; /* GNU coreutils 8.4 compat */
+               /*argv[2] = NULL; - already is */
        }
 
-       execvp(*argv, argv);
-       bb_perror_msg_and_die("cannot execute %s", *argv);
+       BB_EXECVP_or_die(argv);
 }