/* $NetBSD: info_union.c,v 1.1.1.3 2015/01/17 16:34:15 christos Exp $ */ /* * Copyright (c) 1997-2014 Erez Zadok * Copyright (c) 1990 Jan-Simon Pendry * Copyright (c) 1990 Imperial College of Science, Technology & Medicine * Copyright (c) 1990 The Regents of the University of California. * All rights reserved. * * This code is derived from software contributed to Berkeley by * Jan-Simon Pendry at Imperial College, London. * * 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. 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. * * * File: am-utils/amd/info_union.c * */ /* * Get info from the system namespace * * NOTE: Cannot handle reads back through the automounter. * THIS WILL CAUSE A DEADLOCK! */ #ifdef HAVE_CONFIG_H # include #endif /* HAVE_CONFIG_H */ #include #include #define UNION_PREFIX "union:" #define UNION_PREFLEN 6 /* forward declarations */ int union_init(mnt_map *m, char *map, time_t *tp); int union_search(mnt_map *m, char *map, char *key, char **pval, time_t *tp); int union_reload(mnt_map *m, char *map, void (*fn) (mnt_map *, char *, char *)); /* * No way to probe - check the map name begins with "union:" */ int union_init(mnt_map *m, char *map, time_t *tp) { *tp = 0; return NSTREQ(map, UNION_PREFIX, UNION_PREFLEN) ? 0 : ENOENT; } int union_search(mnt_map *m, char *map, char *key, char **pval, time_t *tp) { char *mapd = xstrdup(map + UNION_PREFLEN); char **v = strsplit(mapd, ':', '\"'); char **p; size_t l; for (p = v; p[1]; p++) ; l = strlen(*p) + 5; *pval = xmalloc(l); xsnprintf(*pval, l, "fs:=%s", *p); XFREE(mapd); XFREE(v); return 0; } int union_reload(mnt_map *m, char *map, void (*fn) (mnt_map *, char *, char *)) { static const char fseq[] = "fs:="; char *mapd = xstrdup(map + UNION_PREFLEN); char **v = strsplit(mapd, ':', '\"'); char **dir; /* * Add fake /defaults entry */ (*fn) (m, xstrdup("/defaults"), xstrdup("type:=link;opts:=nounmount;sublink:=${key}")); for (dir = v; *dir; dir++) { size_t l; struct dirent *dp; DIR *dirp = opendir(*dir); if (!dirp) { plog(XLOG_USER, "Cannot read directory %s: %m", *dir); continue; } l = strlen(*dir) + sizeof(fseq); dlog("Reading directory %s...", *dir); while ((dp = readdir(dirp))) { char *val, *dpname = &dp->d_name[0]; if (dpname[0] == '.' && (dpname[1] == '\0' || (dpname[1] == '.' && dpname[2] == '\0'))) continue; dlog("... gives %s", dp->d_name); val = xmalloc(l); xsnprintf(val, l, "%s%s", fseq, *dir); (*fn) (m, xstrdup(dp->d_name), val); } closedir(dirp); } /* * Add wildcard entry */ { size_t l = strlen(*(dir-1)) + sizeof(fseq); char *val = xmalloc(l); xsnprintf(val, l, "%s%s", fseq, *(dir-1)); (*fn) (m, xstrdup("*"), val); } XFREE(mapd); XFREE(v); return 0; }