/*
 * Copyright (c) 1988, 1993
 *	The Regents of the University of California.  All rights reserved.
 *
 * %sccs.include.redist.c%
 */

#ifndef lint
static char copyright[] =
"@(#) Copyright (c) 1988, 1993\n\
	The Regents of the University of California.  All rights reserved.\n";
#endif /* not lint */

#ifndef lint
static char sccsid[] = "@(#)chroot.c	8.1 (Berkeley) 06/09/93";
#endif /* not lint */

#include <sys/types.h>

#include <err.h>
#include <errno.h>
#include <paths.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>

void usage __P((void));

int
main(argc, argv)
	int argc;
	char *argv[];
{
	int ch;
	char *shell;

	while ((ch = getopt(argc, argv, "")) != EOF)
		switch(ch) {
		case '?':
		default:
			usage();
		}
	argc -= optind;
	argv += optind;

	if (argc < 1)
		usage();

	if (chdir(argv[0]) || chroot("."))
		err(1, "%s", argv[0]);

	if (argv[1]) {
		execvp(argv[1], &argv[1]);
		err(1, "%s", argv[1]);
	}

	if (!(shell = getenv("SHELL")))
		shell = _PATH_BSHELL;
	execlp(shell, shell, "-i", NULL);
	err(1, "%s", shell);
	/* NOTREACHED */
}

void
usage()
{
	(void)fprintf(stderr, "usage: chroot newroot [command]\n");
	exit(1);
}