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/* chroot -- run command or shell with special root directory
Copyright (C) 1995, 96 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 "long-options.h"
#include "error.h"
/* The name this program was run with, for error messages. */
char *program_name;
static void
usage (int status)
{
if (status != 0)
fprintf (stderr, _("Try `%s --help' for more information.\n"),
program_name);
else
{
printf (_("\
Usage: %s [OPTION] NEWROOT [COMMAND...]\n\
or: %s OPTION\n\
"), program_name, program_name);
printf (_("\
Run COMMAND with root directory set to NEWROOT.\n\
\n\
--help display this help and exit\n\
--version output version information and exit\n\
\n\
If no command is given, run ``${SHELL} -i'' (default: /bin/sh).\n\
"));
puts (_("\nReport bugs to bug-gnu-utils@gnu.ai.mit.edu"));
}
exit (status);
}
int
main (int argc, char **argv)
{
program_name = argv[0];
parse_long_options (argc, argv, "chroot", GNU_PACKAGE, VERSION, usage);
if (argc == 1)
{
error (0, 0, _("too few arguments"));
usage (1);
}
if (chroot (argv[1]))
error (1, errno, _("cannot change root directory to %s"), argv[1]);
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);
error (1, errno, _("cannot execute %s"), argv[0]);
exit (1);
return 1;
}
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