f540cb27a2
The "source" variable was introduced in r26072, probably as the traditional counterpart to "target". But the "source"/"target" names suggest the opposite of their actual meaning. With ln, for example, the source is the real file and the target is the newly created link. In mount_nullfs the meaning is the opposite: the target is the existing file system and the source is the newly created mountpoint. Better to use "target"/"mountpoint" terminology, which matches the man page. MFC after: 6 weeks Sponsored by: Axcient
126 lines
3.5 KiB
C
126 lines
3.5 KiB
C
/*-
|
|
* SPDX-License-Identifier: BSD-3-Clause
|
|
*
|
|
* 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
|
|
static const 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_null.c 8.6 (Berkeley) 4/26/95";
|
|
#endif
|
|
static const char rcsid[] =
|
|
"$FreeBSD$";
|
|
#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) __dead2;
|
|
|
|
int
|
|
main(int argc, char *argv[])
|
|
{
|
|
struct iovec *iov;
|
|
char *p, *val;
|
|
char mountpoint[MAXPATHLEN];
|
|
char target[MAXPATHLEN];
|
|
char errmsg[255];
|
|
int ch, iovlen;
|
|
char nullfs[] = "nullfs";
|
|
|
|
iov = NULL;
|
|
iovlen = 0;
|
|
errmsg[0] = '\0';
|
|
while ((ch = getopt(argc, argv, "o:")) != -1)
|
|
switch(ch) {
|
|
case 'o':
|
|
val = strdup("");
|
|
p = strchr(optarg, '=');
|
|
if (p != NULL) {
|
|
free(val);
|
|
*p = '\0';
|
|
val = p + 1;
|
|
}
|
|
build_iovec(&iov, &iovlen, optarg, val, (size_t)-1);
|
|
break;
|
|
case '?':
|
|
default:
|
|
usage();
|
|
}
|
|
argc -= optind;
|
|
argv += optind;
|
|
|
|
if (argc != 2)
|
|
usage();
|
|
|
|
/* resolve target and mountpoint with realpath(3) */
|
|
if (checkpath(argv[0], target) != 0)
|
|
err(EX_USAGE, "%s", target);
|
|
if (checkpath(argv[1], mountpoint) != 0)
|
|
err(EX_USAGE, "%s", mountpoint);
|
|
|
|
build_iovec(&iov, &iovlen, "fstype", nullfs, (size_t)-1);
|
|
build_iovec(&iov, &iovlen, "fspath", mountpoint, (size_t)-1);
|
|
build_iovec(&iov, &iovlen, "target", target, (size_t)-1);
|
|
build_iovec(&iov, &iovlen, "errmsg", errmsg, sizeof(errmsg));
|
|
if (nmount(iov, iovlen, 0) < 0) {
|
|
if (errmsg[0] != 0)
|
|
err(1, "%s: %s", mountpoint, errmsg);
|
|
else
|
|
err(1, "%s", mountpoint);
|
|
}
|
|
exit(0);
|
|
}
|
|
|
|
static void
|
|
usage(void)
|
|
{
|
|
(void)fprintf(stderr,
|
|
"usage: mount_nullfs [-o options] target mount-point\n");
|
|
exit(1);
|
|
}
|