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/* chroot -- run command or shell with special root directory
Copyright (C) 95, 96, 1997, 1999-2004 Free Software Foundation, Inc.
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, 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. */
/* Written by Roland McGrath. */
#include <config.h>
#include <stdio.h>
#include <sys/types.h>
#include "system.h"
#include "error.h"
#include "long-options.h"
#include "quote.h"
/* The official name of this program (e.g., no `g' prefix). */
#define PROGRAM_NAME "chroot"
#define AUTHORS "Roland McGrath"
/* Exit statuses. */
enum
{
/* found the specified command but failed to invoke it. */
CHROOT_FOUND_BUT_CANNOT_INVOKE = 126,
/* `chroot' itself failed, or did not find the specified command. */
CHROOT_FAILURE = 127
};
/* The name this program was run with, for error messages. */
char *program_name;
void
usage (int status)
{
if (status != 0)
fprintf (stderr, _("Try `%s --help' for more information.\n"),
program_name);
else
{
printf (_("\
Usage: %s NEWROOT [COMMAND...]\n\
or: %s OPTION\n\
"), program_name, program_name);
fputs (_("\
Run COMMAND with root directory set to NEWROOT.\n\
\n\
"), stdout);
fputs (HELP_OPTION_DESCRIPTION, stdout);
fputs (VERSION_OPTION_DESCRIPTION, stdout);
fputs (_("\
\n\
If no command is given, run ``${SHELL} -i'' (default: /bin/sh).\n\
"), stdout);
printf (_("\nReport bugs to <%s>.\n"), PACKAGE_BUGREPORT);
}
exit (status);
}
int
main (int argc, char **argv)
{
initialize_main (&argc, &argv);
program_name = argv[0];
setlocale (LC_ALL, "");
bindtextdomain (PACKAGE, LOCALEDIR);
textdomain (PACKAGE);
atexit (close_stdout);
parse_long_options (argc, argv, PROGRAM_NAME, GNU_PACKAGE, VERSION,
usage, AUTHORS, (char const *) NULL);
if (argc <= 1)
{
error (0, 0, _("too few arguments"));
usage (CHROOT_FAILURE);
}
if (chroot (argv[1]))
error (CHROOT_FAILURE, errno,
_("cannot change root directory to %s"), argv[1]);
if (chdir ("/"))
error (CHROOT_FAILURE, errno, _("cannot chdir to root directory"));
if (argc == 2)
{
/* No command. Run an interactive shell. */
char *shell = getenv ("SHELL");
if (shell == NULL)
shell = "/bin/sh";
argv[0] = shell;
argv[1] = "-i";
}
else
{
/* The following arguments give the command. */
argv += 2;
}
/* Execute the given command. */
execvp (argv[0], argv);
{
int exit_status = (errno == ENOENT
? CHROOT_FAILURE
: CHROOT_FOUND_BUT_CANNOT_INVOKE);
error (0, errno, _("cannot run command %s"), quote (argv[0]));
exit (exit_status);
}
}
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