1/* $NetBSD: mount_overlay.c,v 1.14 2020/07/26 08:20:22 mlelstv Exp $ */ 2 3/* 4 * Copyright (c) 1992, 1993, 1994 5 * The Regents of the University of California. All rights reserved. 6 * 7 * This code is derived from software donated to Berkeley by 8 * Jan-Simon Pendry. 9 * 10 * Redistribution and use in source and binary forms, with or without 11 * modification, are permitted provided that the following conditions 12 * are met: 13 * 1. Redistributions of source code must retain the above copyright 14 * notice, this list of conditions and the following disclaimer. 15 * 2. Redistributions in binary form must reproduce the above copyright 16 * notice, this list of conditions and the following disclaimer in the 17 * documentation and/or other materials provided with the distribution. 18 * 3. Neither the name of the University nor the names of its contributors 19 * may be used to endorse or promote products derived from this software 20 * without specific prior written permission. 21 * 22 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 23 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 24 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 25 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 26 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 27 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 28 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 29 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 30 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 31 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 32 * SUCH DAMAGE. 33 */ 34 35#include <sys/cdefs.h> 36#ifndef lint 37__COPYRIGHT("@(#) Copyright (c) 1992, 1993, 1994\ 38 The Regents of the University of California. All rights reserved."); 39#endif /* not lint */ 40 41#ifndef lint 42#if 0 43static char sccsid[] = "@(#)mount_null.c 8.6 (Berkeley) 4/26/95"; 44#else 45__RCSID("$NetBSD: mount_overlay.c,v 1.14 2020/07/26 08:20:22 mlelstv Exp $"); 46#endif 47#endif /* not lint */ 48 49#include <sys/param.h> 50#include <sys/mount.h> 51#include <miscfs/overlay/overlay.h> 52 53#include <err.h> 54#include <stdio.h> 55#include <unistd.h> 56#include <stdlib.h> 57#include <string.h> 58 59#include <mntopts.h> 60 61#include "mountprog.h" 62 63static const struct mntopt mopts[] = { 64 MOPT_STDOPTS, 65 MOPT_GETARGS, 66 MOPT_NULL, 67}; 68 69int mount_overlay(int argc, char **argv); 70__dead static void usage(void); 71 72#ifndef MOUNT_NOMAIN 73int 74main(int argc, char **argv) 75{ 76 return mount_overlay(argc, argv); 77} 78#endif 79 80int 81mount_overlay(int argc, char *argv[]) 82{ 83 struct overlay_args args; 84 int ch, mntflags; 85 char target[MAXPATHLEN], canon_dir[MAXPATHLEN]; 86 mntoptparse_t mp; 87 88 mntflags = 0; 89 while ((ch = getopt(argc, argv, "o:")) != -1) 90 switch(ch) { 91 case 'o': 92 mp = getmntopts(optarg, mopts, &mntflags, 0); 93 if (mp == NULL) 94 err(1, "getmntopts"); 95 freemntopts(mp); 96 break; 97 case '?': 98 default: 99 usage(); 100 } 101 argc -= optind; 102 argv += optind; 103 104 if (argc != 2) 105 usage(); 106 107 pathadj(argv[0], target); 108 pathadj(argv[1], canon_dir); 109 110 args.la.target = target; 111 112 if (mount(MOUNT_OVERLAY, canon_dir, mntflags, &args, sizeof args) == -1) 113 err(1, "%s on %s", target, canon_dir); 114 exit(0); 115} 116 117static void 118usage(void) 119{ 120 (void)fprintf(stderr, 121 "usage: mount_overlay [-o options] /overlay mount_point\n"); 122 exit(1); 123} 124