1 /* $NetBSD: info_union.c,v 1.1.1.1 2008/09/19 20:07:16 christos Exp $ */ 2 3 /* 4 * Copyright (c) 1997-2007 Erez Zadok 5 * Copyright (c) 1990 Jan-Simon Pendry 6 * Copyright (c) 1990 Imperial College of Science, Technology & Medicine 7 * Copyright (c) 1990 The Regents of the University of California. 8 * All rights reserved. 9 * 10 * This code is derived from software contributed to Berkeley by 11 * Jan-Simon Pendry at Imperial College, London. 12 * 13 * Redistribution and use in source and binary forms, with or without 14 * modification, are permitted provided that the following conditions 15 * are met: 16 * 1. Redistributions of source code must retain the above copyright 17 * notice, this list of conditions and the following disclaimer. 18 * 2. Redistributions in binary form must reproduce the above copyright 19 * notice, this list of conditions and the following disclaimer in the 20 * documentation and/or other materials provided with the distribution. 21 * 3. All advertising materials mentioning features or use of this software 22 * must display the following acknowledgment: 23 * This product includes software developed by the University of 24 * California, Berkeley and its contributors. 25 * 4. Neither the name of the University nor the names of its contributors 26 * may be used to endorse or promote products derived from this software 27 * without specific prior written permission. 28 * 29 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 30 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 31 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 32 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 33 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 34 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 35 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 36 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 37 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 38 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 39 * SUCH DAMAGE. 40 * 41 * 42 * File: am-utils/amd/info_union.c 43 * 44 */ 45 46 /* 47 * Get info from the system namespace 48 * 49 * NOTE: Cannot handle reads back through the automounter. 50 * THIS WILL CAUSE A DEADLOCK! 51 */ 52 53 #ifdef HAVE_CONFIG_H 54 # include <config.h> 55 #endif /* HAVE_CONFIG_H */ 56 #include <am_defs.h> 57 #include <amd.h> 58 59 #define UNION_PREFIX "union:" 60 #define UNION_PREFLEN 6 61 62 /* forward declarations */ 63 int union_init(mnt_map *m, char *map, time_t *tp); 64 int union_search(mnt_map *m, char *map, char *key, char **pval, time_t *tp); 65 int union_reload(mnt_map *m, char *map, void (*fn) (mnt_map *, char *, char *)); 66 67 68 /* 69 * No way to probe - check the map name begins with "union:" 70 */ 71 int 72 union_init(mnt_map *m, char *map, time_t *tp) 73 { 74 *tp = 0; 75 return NSTREQ(map, UNION_PREFIX, UNION_PREFLEN) ? 0 : ENOENT; 76 } 77 78 79 int 80 union_search(mnt_map *m, char *map, char *key, char **pval, time_t *tp) 81 { 82 char *mapd = strdup(map + UNION_PREFLEN); 83 char **v = strsplit(mapd, ':', '\"'); 84 char **p; 85 size_t l; 86 87 for (p = v; p[1]; p++) ; 88 l = strlen(*p) + 5; 89 *pval = xmalloc(l); 90 xsnprintf(*pval, l, "fs:=%s", *p); 91 XFREE(mapd); 92 XFREE(v); 93 return 0; 94 } 95 96 97 int 98 union_reload(mnt_map *m, char *map, void (*fn) (mnt_map *, char *, char *)) 99 { 100 char *mapd = strdup(map + UNION_PREFLEN); 101 char **v = strsplit(mapd, ':', '\"'); 102 char **dir; 103 104 /* 105 * Add fake /defaults entry 106 */ 107 (*fn) (m, strdup("/defaults"), strdup("type:=link;opts:=nounmount;sublink:=${key}")); 108 109 for (dir = v; *dir; dir++) { 110 size_t l; 111 struct dirent *dp; 112 113 DIR *dirp = opendir(*dir); 114 if (!dirp) { 115 plog(XLOG_USER, "Cannot read directory %s: %m", *dir); 116 continue; 117 } 118 l = strlen(*dir) + 5; 119 120 dlog("Reading directory %s...", *dir); 121 while ((dp = readdir(dirp))) { 122 char *val, *dpname = &dp->d_name[0]; 123 if (dpname[0] == '.' && 124 (dpname[1] == '\0' || 125 (dpname[1] == '.' && dpname[2] == '\0'))) 126 continue; 127 128 dlog("... gives %s", dp->d_name); 129 val = xmalloc(l); 130 xsnprintf(val, l + 5, "fs:=%s", *dir); 131 (*fn) (m, strdup(dp->d_name), val); 132 } 133 closedir(dirp); 134 } 135 136 /* 137 * Add wildcard entry 138 */ 139 { 140 size_t l = strlen(*(dir-1)) + 5; 141 char *val = xmalloc(l); 142 143 xsnprintf(val, l, "fs:=%s", *(dir-1)); 144 (*fn) (m, strdup("*"), val); 145 } 146 XFREE(mapd); 147 XFREE(v); 148 return 0; 149 } 150