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/* $OpenBSD: mount_union.c,v 1.11 2005/04/08 20:09:38 jaredy Exp $ */
/* $NetBSD: mount_union.c,v 1.3 1996/04/13 01:32:11 jtc Exp $ */
/*
* Copyright (c) 1992, 1993, 1994
* The Regents of the University of California. All rights reserved.
*
* This code is derived from software donated 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.
*/
#ifndef lint
char copyright[] =
"@(#) Copyright (c) 1992, 1993, 1994\n\
The Regents of the University of California. All rights reserved.\n";
#endif /* not lint */
#ifndef lint
#if 0
static char sccsid[] = "@(#)mount_union.c 8.5 (Berkeley) 3/27/94";
#else
static char rcsid[] = "$OpenBSD: mount_union.c,v 1.11 2005/04/08 20:09:38 jaredy Exp $";
#endif
#endif /* not lint */
#include <sys/param.h>
#include <sys/mount.h>
#include <miscfs/union/union.h>
#include <err.h>
#include <errno.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include "mntopts.h"
const struct mntopt mopts[] = {
MOPT_STDOPTS,
{ NULL }
};
int subdir(const char *, const char *);
void usage(void);
int
main(int argc, char *argv[])
{
struct union_args args;
int ch, mntflags;
char target[MAXPATHLEN];
mntflags = 0;
args.mntflags = UNMNT_ABOVE;
while ((ch = getopt(argc, argv, "bo:r")) != -1)
switch (ch) {
case 'b':
args.mntflags &= ~UNMNT_OPMASK;
args.mntflags |= UNMNT_BELOW;
break;
case 'o':
getmntopts(optarg, mopts, &mntflags);
break;
case 'r':
args.mntflags &= ~UNMNT_OPMASK;
args.mntflags |= UNMNT_REPLACE;
break;
case '?':
default:
usage();
/* NOTREACHED */
}
argc -= optind;
argv += optind;
if (argc != 2)
usage();
if (realpath(argv[0], target) == 0)
err(1, "realpath %s", argv[0]);
if (subdir(target, argv[1]) || subdir(argv[1], target))
errx(1, "%s (%s) and %s are not distinct paths",
argv[0], target, argv[1]);
args.target = target;
if (mount(MOUNT_UNION, argv[1], mntflags, &args)) {
if (errno == EOPNOTSUPP)
errx(1, "%s: Filesystem not supported by kernel",
argv[1]);
else
err(1, "%s", argv[1]);
}
exit(0);
}
int
subdir(const char *p, const char *dir)
{
int l;
l = strlen(dir);
if (l <= 1)
return (1);
if ((strncmp(p, dir, l) == 0) && (p[l] == '/' || p[l] == '\0'))
return (1);
return (0);
}
void
usage(void)
{
(void)fprintf(stderr,
"usage: mount_union [-br] [-o options] target_fs mount_point\n");
exit(1);
}
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