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/* |
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* Copyright (c) 1990 Jan-Simon Pendry |
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* Copyright (c) 1990 Imperial College of Science, Technology & Medicine |
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* Copyright (c) 1990, 1993 |
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* The Regents of the University of California. All rights reserved. |
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* |
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* This code is derived from software contributed to Berkeley by |
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* Jan-Simon Pendry at Imperial College, London. |
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* |
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* Redistribution and use in source and binary forms, with or without |
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* modification, are permitted provided that the following conditions |
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* are met: |
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* 1. Redistributions of source code must retain the above copyright |
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* notice, this list of conditions and the following disclaimer. |
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* 2. Redistributions in binary form must reproduce the above copyright |
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* notice, this list of conditions and the following disclaimer in the |
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* documentation and/or other materials provided with the distribution. |
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* 3. Neither the name of the University nor the names of its contributors |
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* may be used to endorse or promote products derived from this software |
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* without specific prior written permission. |
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* |
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND |
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE |
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL |
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS |
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) |
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT |
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY |
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF |
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* SUCH DAMAGE. |
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* |
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* from: @(#)info_union.c 8.1 (Berkeley) 6/6/93 |
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* $Id: info_union.c,v 1.9 2014/10/26 03:03:34 guenther Exp $ |
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*/ |
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/* |
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* Get info from the system namespace |
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* |
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* NOTE: Cannot handle reads back through the automounter. |
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* THIS WILL CAUSE A DEADLOCK! |
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*/ |
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#include "am.h" |
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#include <dirent.h> |
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#define DIRENT struct dirent |
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#define UNION_PREFIX "union:" |
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#define UNION_PREFLEN 6 |
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/* |
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* No way to probe - check the map name begins with "union:" |
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*/ |
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int |
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union_init(char *map, time_t *tp) |
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{ |
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*tp = 0; |
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return strncmp(map, UNION_PREFIX, UNION_PREFLEN) == 0 ? 0 : ENOENT; |
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} |
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int |
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union_search(mnt_map *m, char *map, char *key, char **pval, time_t *tp) |
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{ |
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char *mapd = strdup(map + UNION_PREFLEN); |
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char **v = strsplit(mapd, ':', '\"'); |
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char **p; |
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for (p = v; p[1]; p++) |
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; |
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*pval = xmalloc(strlen(*p) + 5); |
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snprintf(*pval, strlen(*p) + 5, "fs:=%s", *p); |
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free(mapd); |
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free(v); |
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return 0; |
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} |
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int |
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union_reload(mnt_map *m, char *map, void (*fn)(mnt_map *, char *, char *)) |
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{ |
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char *mapd = strdup(map + UNION_PREFLEN); |
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char **v = strsplit(mapd, ':', '\"'); |
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char **dir; |
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/* |
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* Add fake /defaults entry |
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*/ |
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(*fn)(m, strdup("/defaults"), |
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strdup("type:=link;opts:=nounmount;sublink:=${key}")); |
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for (dir = v; *dir; dir++) { |
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DIR *dirp = opendir(*dir); |
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DIRENT *dp; |
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int dlen; |
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if (!dirp) { |
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plog(XLOG_USER, "Cannot read directory %s: %m", *dir); |
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continue; |
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} |
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dlen = strlen(*dir); |
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#ifdef DEBUG |
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dlog("Reading directory %s...", *dir); |
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#endif |
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while ((dp = readdir(dirp))) { |
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char *val; |
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if (dp->d_name[0] == '.' && |
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(dp->d_name[1] == '\0' || |
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(dp->d_name[1] == '.' && dp->d_name[2] == '\0'))) |
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continue; |
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#ifdef DEBUG |
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dlog("... gives %s", dp->d_name); |
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#endif |
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val = xmalloc(dlen + 5); |
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snprintf(val, dlen + 5, "fs:=%s", *dir); |
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(*fn)(m, strdup(dp->d_name), val); |
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} |
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closedir(dirp); |
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} |
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/* |
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* Add wildcard entry |
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*/ |
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{ |
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char *val = xmalloc(strlen(dir[-1]) + 5); |
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snprintf(val, strlen(dir[-1]) + 5, "fs:=%s", dir[-1]); |
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(*fn)(m, strdup("*"), val); |
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} |
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free(mapd); |
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free(v); |
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return 0; |
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} |
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