config root man

/*-
 * Copyright (c) 1993, 1994
 *	The Regents of the University of California.  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.
 * 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.
 */

#ifndef lint
static const char copyright[] =
"@(#) Copyright (c) 1993, 1994\n\
	The Regents of the University of California.  All rights reserved.\n";
#endif /* not lint */

#ifndef lint
/*
static char sccsid[] = "@(#)mount_lfs.c	8.3 (Berkeley) 3/27/94";
*/
static const char rcsid[] =
  "$FreeBSD: release/9.1.0/sbin/mount_ext2fs/mount_ext2fs.c 166290 2007-01-28 00:51:01Z rodrigc $";
#endif /* not lint */

#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"

static void	usage(void);

int
main(int argc, char *argv[])
{
	struct iovec *iov;
	int ch, iovlen;
	char *fs_name, *fspec, mntpath[MAXPATHLEN];
	char *fstype;

	fstype = strrchr(argv[0], '_');
	if (fstype == NULL)
		errx(EX_USAGE, "argv[0] must end in _fstype");
	else
		++fstype;

	iov = NULL;
	iovlen = 0;
	while ((ch = getopt(argc, argv, "o:")) != -1)
		switch (ch) {
		case 'o': {
			char *p = NULL;
			char *val = strdup("");
			p = strchr(optarg, '=');
			if (p != NULL) {
				free(val);
				*p = '\0';
				val = p + 1;
			}
			build_iovec(&iov, &iovlen, optarg, val, strlen(val)+1);
			}
			break;
		case '?':
		default:
			usage();
		}
	argc -= optind;
	argv += optind;

	if (argc != 2)
		usage();

	fspec = argv[0];	/* the name of the device file */
	fs_name = argv[1];	/* the mount point */

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

	build_iovec(&iov, &iovlen, "fstype", fstype, strlen(fstype) + 1);
	build_iovec(&iov, &iovlen, "fspath", mntpath, strlen(mntpath) + 1);
	build_iovec(&iov, &iovlen, "from", fspec, strlen(fspec) + 1);

	if (nmount(iov, iovlen, 0) < 0)
		err(EX_OSERR, "%s", fspec);
	return (0);
}

static void
usage()
{
	(void)fprintf(stderr,
		"usage: mount_ext2fs [-o options] special node\n");
	exit(EX_USAGE);
}