1 /* $NetBSD: mount_overlay.c,v 1.3 2002/09/21 18:43:37 christos 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. All advertising materials mentioning features or use of this software 19 * must display the following acknowledgement: 20 * This product includes software developed by the University of 21 * California, Berkeley and its contributors. 22 * 4. Neither the name of the University nor the names of its contributors 23 * may be used to endorse or promote products derived from this software 24 * without specific prior written permission. 25 * 26 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 27 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 28 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 29 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 30 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 31 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 32 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 33 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 34 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 35 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 36 * SUCH DAMAGE. 37 */ 38 39 #include <sys/cdefs.h> 40 #ifndef lint 41 __COPYRIGHT("@(#) Copyright (c) 1992, 1993, 1994\n\ 42 The Regents of the University of California. All rights reserved.\n"); 43 #endif /* not lint */ 44 45 #ifndef lint 46 #if 0 47 static char sccsid[] = "@(#)mount_null.c 8.6 (Berkeley) 4/26/95"; 48 #else 49 __RCSID("$NetBSD: mount_overlay.c,v 1.3 2002/09/21 18:43:37 christos Exp $"); 50 #endif 51 #endif /* not lint */ 52 53 #include <sys/param.h> 54 #include <sys/mount.h> 55 #include <miscfs/overlay/overlay.h> 56 57 #include <err.h> 58 #include <stdio.h> 59 #include <unistd.h> 60 #include <stdlib.h> 61 #include <string.h> 62 63 #include "mntopts.h" 64 65 static const struct mntopt mopts[] = { 66 MOPT_STDOPTS, 67 MOPT_GETARGS, 68 { NULL } 69 }; 70 71 int main __P((int, char *[])); 72 int mount_overlay __P((int argc, char **argv)); 73 static void usage __P((void)); 74 75 #ifndef MOUNT_NOMAIN 76 int 77 main(argc, argv) 78 int argc; 79 char **argv; 80 { 81 return mount_overlay(argc, argv); 82 } 83 #endif 84 85 int 86 mount_overlay(argc, argv) 87 int argc; 88 char *argv[]; 89 { 90 struct overlay_args args; 91 int ch, mntflags; 92 char target[MAXPATHLEN]; 93 94 mntflags = 0; 95 while ((ch = getopt(argc, argv, "o:")) != -1) 96 switch(ch) { 97 case 'o': 98 getmntopts(optarg, mopts, &mntflags, 0); 99 break; 100 case '?': 101 default: 102 usage(); 103 } 104 argc -= optind; 105 argv += optind; 106 107 if (argc != 2) 108 usage(); 109 110 if (realpath(argv[0], target) == 0) 111 err(1, "%s", target); 112 113 args.la.target = target; 114 115 if (mount(MOUNT_OVERLAY, argv[1], mntflags, &args)) 116 err(1, "%s on %s", target, argv[1]); 117 exit(0); 118 } 119 120 static void 121 usage() 122 { 123 (void)fprintf(stderr, 124 "usage: mount_overlay [-o options] /overlay mount_point\n"); 125 exit(1); 126 } 127