1 /* $NetBSD: mount_overlay.c,v 1.5 2003/08/07 10:04:30 agc 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\n\ 38 The Regents of the University of California. All rights reserved.\n"); 39 #endif /* not lint */ 40 41 #ifndef lint 42 #if 0 43 static char sccsid[] = "@(#)mount_null.c 8.6 (Berkeley) 4/26/95"; 44 #else 45 __RCSID("$NetBSD: mount_overlay.c,v 1.5 2003/08/07 10:04:30 agc 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 static const struct mntopt mopts[] = { 62 MOPT_STDOPTS, 63 MOPT_GETARGS, 64 { NULL } 65 }; 66 67 int main __P((int, char *[])); 68 int mount_overlay __P((int argc, char **argv)); 69 static void usage __P((void)); 70 71 #ifndef MOUNT_NOMAIN 72 int 73 main(argc, argv) 74 int argc; 75 char **argv; 76 { 77 return mount_overlay(argc, argv); 78 } 79 #endif 80 81 int 82 mount_overlay(argc, argv) 83 int argc; 84 char *argv[]; 85 { 86 struct overlay_args args; 87 int ch, mntflags; 88 char target[MAXPATHLEN]; 89 90 mntflags = 0; 91 while ((ch = getopt(argc, argv, "o:")) != -1) 92 switch(ch) { 93 case 'o': 94 getmntopts(optarg, mopts, &mntflags, 0); 95 break; 96 case '?': 97 default: 98 usage(); 99 } 100 argc -= optind; 101 argv += optind; 102 103 if (argc != 2) 104 usage(); 105 106 if (realpath(argv[0], target) == 0) 107 err(1, "%s", target); 108 109 args.la.target = target; 110 111 if (mount(MOUNT_OVERLAY, argv[1], mntflags, &args)) 112 err(1, "%s on %s", target, argv[1]); 113 exit(0); 114 } 115 116 static void 117 usage() 118 { 119 (void)fprintf(stderr, 120 "usage: mount_overlay [-o options] /overlay mount_point\n"); 121 exit(1); 122 } 123