NetBSD/sbin/mount_kernfs/mount_kernfs.c

/*	$NetBSD: mount_kernfs.c,v 1.25 2011/08/29 14:35:01 joerg Exp $	*/

/*
 * Copyright (c) 1992, 1993, 1994
 *	The Regents of the University of California.  All rights reserved.
 *
 * This code is derived from software contributed to Berkeley by
 * Jan-Simon Pendry.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. Neither the name of the University nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 */

/*
 * Copyright (c) 1990, 1992 Jan-Simon Pendry
 *
 * This code is derived from software contributed to Berkeley by
 * Jan-Simon Pendry.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgement:
 *	This product includes software developed by the University of
 *	California, Berkeley and its contributors.
 * 4. Neither the name of the University nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 */

#include <sys/cdefs.h>
#ifndef lint
__COPYRIGHT("@(#) Copyright (c) 1992, 1993, 1994\
 The Regents of the University of California.  All rights reserved.");
#endif /* not lint */

#ifndef lint
#if 0
static char sccsid[] = "@(#)mount_kernfs.c	8.3 (Berkeley) 5/4/95";
#else
__RCSID("$NetBSD: mount_kernfs.c,v 1.25 2011/08/29 14:35:01 joerg Exp $");
#endif
#endif /* not lint */

#include <sys/param.h>
#include <sys/mount.h>

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

#include <mntopts.h>

#include "mount_kernfs.h"

static const struct mntopt mopts[] = {
	MOPT_STDOPTS,
	MOPT_GETARGS,
	MOPT_NULL,
};

int	mount_kernfs(int argc, char **argv);
__dead static void	usage(void);

#ifndef MOUNT_NOMAIN
int
main(int argc, char **argv)
{
	return mount_kernfs(argc, argv);
}
#endif

void
mount_kernfs_parseargs(int argc, char *argv[], void *dummy, int *mntflags,
	char *canon_dev, char *canon_dir)
{
	int ch;
	mntoptparse_t mp;

	*mntflags = 0;
	while ((ch = getopt(argc, argv, "o:")) != -1)
		switch (ch) {
		case 'o':
			mp = getmntopts(optarg, mopts, mntflags, 0);
			if (mp == NULL)
				err(1, "getmntopts");
			freemntopts(mp);
			break;
		case '?':
		default:
			usage();
		}
	argc -= optind;
	argv += optind;

	if (argc != 2)
		usage();

	/* not supported, fail silently */
	if (*mntflags & MNT_GETARGS)
		exit(0);

	strlcpy(canon_dev, argv[0], MAXPATHLEN);
	if (realpath(argv[1], canon_dir) == NULL)    /* Check mounton path */
		err(1, "realpath %s", argv[1]);
	if (strncmp(argv[1], canon_dir, MAXPATHLEN)) {
		warnx("\"%s\" is a relative path.", argv[1]);
		warnx("using \"%s\" instead.", canon_dir);
	}
}

int
mount_kernfs(int argc, char *argv[])
{
	char canon_dev[MAXPATHLEN], canon_dir[MAXPATHLEN];
	int mntflags;

	mount_kernfs_parseargs(argc, argv, NULL, &mntflags,
	    canon_dev, canon_dir);
	if (mount(MOUNT_KERNFS, canon_dir, mntflags, NULL, 0) == -1)
		err(1, "kernfs on %s", argv[1]);
	exit(0);
}

static void
usage(void)
{
	(void)fprintf(stderr,
		"usage: mount_kernfs [-o options] /kern mount_point\n");
	exit(1);
}