/* * Copyright (c) 1999 Apple Computer, Inc. All rights reserved. * * @APPLE_LICENSE_HEADER_START@ * * This file contains Original Code and/or Modifications of Original Code * as defined in and that are subject to the Apple Public Source License * Version 2.0 (the 'License'). You may not use this file except in * compliance with the License. Please obtain a copy of the License at * http://www.opensource.apple.com/apsl/ and read it before using this * file. * * The Original Code and all software distributed under the License are * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES, * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY, * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT. * Please see the License for the specific language governing rights and * limitations under the License. * * @APPLE_LICENSE_HEADER_END@ */ /* * 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. All advertising materials mentioning features or use of this software * must display the following acknowledgement: * This product includes software developed by the University of * California, Berkeley and its contributors. * 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. */ #include <sys/param.h> #include <sys/mount.h> #include <miscfs/union/union.h> #include <err.h> #include <stdio.h> #include <stdlib.h> #include <string.h> #include <unistd.h> #include <mntopts.h> struct mntopt mopts[] = { MOPT_STDOPTS, { NULL } }; int subdir __P((const char *, const char *)); void usage __P((void)); int main(argc, argv) 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")) != EOF) switch (ch) { case 'b': args.mntflags &= ~UNMNT_OPMASK; args.mntflags |= UNMNT_BELOW; break; #ifdef FAULTFS case 'f': args.mntflags &= ~UNMNT_OPMASK; args.mntflags |= UNMNT_FAULTIN; break; #endif case 'o': getmntopts(optarg, mopts, &mntflags, 0); 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, "%s", target); 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("unionfs", argv[1], mntflags, &args)) err(1, NULL); exit(0); } int subdir(p, dir) 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)fprintf(stderr, "usage: mount_union [-br] [-o options] target_fs mount_point\n"); exit(1); }