config root man

/*-
 * Copyright (c) 2005 Jean-Sébastien Pédron
 * All rights reserved.
 *
 * 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.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR 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 AUTHOR 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.
 *
 * $FreeBSD: release/9.1.0/sbin/mount_reiserfs/mount_reiserfs.c 222176 2011-05-22 14:03:30Z uqs $
 */

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

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

#include "mntopts.h"

struct mntopt mopts[] = {
	MOPT_STDOPTS,
	MOPT_END
};

void	usage(void);

int
main(int argc, char *argv[])
{
	struct iovec *iov;
	int ch, mntflags, iovlen;
	char *dev, *dir, mntpath[MAXPATHLEN];
	char fstype[] = "reiserfs";

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

	if (argc != 2)
		usage();

	dev = argv[0];
	dir = argv[1];

	/*
	 * Resolve the mountpoint with realpath(3) and remove unnecessary
	 * slashes from the devicename if there are any.
	 */
	(void)checkpath(dir, mntpath);
	(void)rmslashes(dev, dev);

	/* Read-only support for now */
	mntflags |= MNT_RDONLY;

	/* Prepare the options vector for nmount(). build_iovec() is declared
	 * in mntopts.h. */
	iov = NULL;
	iovlen = 0;
	build_iovec(&iov, &iovlen, "fstype", fstype, (size_t)-1);
	build_iovec(&iov, &iovlen, "fspath", mntpath, (size_t)-1);
	build_iovec(&iov, &iovlen, "from", dev, (size_t)-1);

	if (nmount(iov, iovlen, mntflags) < 0)
		err(EX_OSERR, "%s", dev);

	exit(0);
}

void
usage(void)
{
	fprintf(stderr,
	    "usage: mount_reiserfs [-o options] special node\n");
	exit(EX_USAGE);
}