/*
* Mini chroot implementation for busybox
*
+ * Copyright (C) 1999-2004 by Erik Andersen <andersen@codepoet.org>
*
- * Copyright (C) 1999,2000,2001 by Lineo, inc.
- * Written by Erik Andersen <andersen@lineo.com>, <andersee@debian.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
- *
+ * Licensed under GPLv2 or later, see file LICENSE in this source tree.
*/
-
-#include <stdlib.h>
-#include <stdio.h>
-#include <unistd.h>
-#include <errno.h>
-#include "busybox.h"
-
-int chroot_main(int argc, char **argv)
+//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_NOEXEC(chroot, chroot, BB_DIR_USR_SBIN, BB_SUID_DROP, chroot))
+
+//kbuild:lib-$(CONFIG_CHROOT) += chroot.o
+
+/* BB_AUDIT SUSv3 N/A -- Matches GNU behavior. */
+
+//usage:#define chroot_trivial_usage
+//usage: "NEWROOT [PROG ARGS]"
+//usage:#define chroot_full_usage "\n\n"
+//usage: "Run PROG with root directory set to NEWROOT"
+//usage:
+//usage:#define chroot_example_usage
+//usage: "$ 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"
+
+#include "libbb.h"
+
+int chroot_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
+int chroot_main(int argc UNUSED_PARAM, char **argv)
{
- char *prog;
-
- if ((argc < 2) || (**(argv + 1) == '-')) {
- show_usage();
+ ++argv;
+ if (!*argv)
+ bb_show_usage();
+
+ xchroot(*argv);
+
+ ++argv;
+ if (!*argv) { /* no 2nd param (PROG), use shell */
+ argv -= 2;
+ argv[0] = (char *) get_shell_name();
+ argv[1] = (char *) "-i"; /* GNU coreutils 8.4 compat */
+ /*argv[2] = NULL; - already is */
}
- argc--;
- argv++;
-
- if (chroot(*argv) || (chdir("/"))) {
- perror_msg_and_die("cannot change root directory to %s", *argv);
- }
-
- argc--;
- argv++;
- if (argc >= 1) {
- prog = *argv;
- execvp(*argv, argv);
- } else {
-#if defined shell_main && defined BB_FEATURE_SH_STANDALONE_SHELL
- char shell[] = "/bin/sh";
- char *shell_argv[2] = { shell, NULL };
- applet_name = shell;
- shell_main(1, shell_argv);
- return EXIT_SUCCESS;
-#else
- prog = getenv("SHELL");
- if (!prog)
- prog = "/bin/sh";
- execlp(prog, prog, NULL);
-#endif
- }
- perror_msg_and_die("cannot execute %s", prog);
+ BB_EXECVP_or_die(argv);
}
-
-
-/*
-Local Variables:
-c-file-style: "linux"
-c-basic-offset: 4
-tab-width: 4
-End:
-*/