158 lines
4.0 KiB
C
158 lines
4.0 KiB
C
/* $NetBSD: mount_union.c,v 1.23 2020/07/26 08:20:23 mlelstv Exp $ */
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/*
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* Copyright (c) 1992, 1993, 1994
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* The Regents of the University of California. All rights reserved.
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*
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* This code is derived from software donated to Berkeley by
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* Jan-Simon Pendry.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include <sys/cdefs.h>
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#ifndef lint
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__COPYRIGHT("@(#) Copyright (c) 1992, 1993, 1994\
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The Regents of the University of California. All rights reserved.");
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#endif /* not lint */
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#ifndef lint
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#if 0
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static char sccsid[] = "@(#)mount_union.c 8.6 (Berkeley) 4/26/95";
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#else
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__RCSID("$NetBSD: mount_union.c,v 1.23 2020/07/26 08:20:23 mlelstv Exp $");
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#endif
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#endif /* not lint */
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#include <sys/param.h>
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#include <sys/mount.h>
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#include <miscfs/union/union.h>
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#include <err.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <unistd.h>
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#include <util.h>
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#include <mntopts.h>
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#include "mountprog.h"
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static const struct mntopt mopts[] = {
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MOPT_STDOPTS,
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MOPT_GETARGS,
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MOPT_NULL,
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};
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int mount_union(int argc, char **argv);
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static int subdir(const char *, const char *);
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__dead static void usage(void);
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#ifndef MOUNT_NOMAIN
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int
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main(int argc, char **argv)
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{
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return mount_union(argc, argv);
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}
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#endif
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int
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mount_union(int argc, char *argv[])
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{
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struct union_args args;
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int ch, mntflags;
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char target[MAXPATHLEN], canon_dir[MAXPATHLEN];
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mntoptparse_t mp;
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mntflags = 0;
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args.mntflags = UNMNT_ABOVE;
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while ((ch = getopt(argc, argv, "bo:")) != -1)
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switch (ch) {
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case 'b':
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args.mntflags &= ~UNMNT_OPMASK;
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args.mntflags |= UNMNT_BELOW;
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break;
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case 'o':
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mp = getmntopts(optarg, mopts, &mntflags, 0);
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if (mp == NULL)
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err(1, "getmntopts");
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freemntopts(mp);
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break;
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case '?':
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default:
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usage();
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/* NOTREACHED */
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}
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argc -= optind;
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argv += optind;
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if (argc != 2)
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usage();
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pathadj(argv[0], target);
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pathadj(argv[1], canon_dir);
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if (subdir(target, canon_dir) || subdir(canon_dir, target))
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errx(1, "%s (%s) and %s are not distinct paths",
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argv[0], target, canon_dir);
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args.target = target;
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if (mount(MOUNT_UNION, canon_dir, mntflags, &args, sizeof args) == -1)
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err(1, "%s on %s", target, canon_dir);
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if (mntflags & MNT_GETARGS) {
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char buf[1024];
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(void)snprintb(buf, sizeof(buf), UNMNT_BITS, args.mntflags);
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printf("flags=%s\n", buf);
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}
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exit(0);
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}
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static int
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subdir(const char *p, const char *dir)
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{
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int l;
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l = strlen(dir);
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if (l <= 1)
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return (1);
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if ((strncmp(p, dir, l) == 0) && (p[l] == '/' || p[l] == '\0'))
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return (1);
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return (0);
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}
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static void
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usage(void)
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{
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(void)fprintf(stderr,
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"usage: mount_union [-br] [-o options] target_fs mount_point\n");
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exit(1);
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}
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