2 * Copyright (c) 1997-2006 Erez Zadok
3 * Copyright (c) 1990 Jan-Simon Pendry
4 * Copyright (c) 1990 Imperial College of Science, Technology & Medicine
5 * Copyright (c) 1990 The Regents of the University of California.
8 * This code is derived from software contributed to Berkeley by
9 * Jan-Simon Pendry at Imperial College, London.
11 * Redistribution and use in source and binary forms, with or without
12 * modification, are permitted provided that the following conditions
14 * 1. Redistributions of source code must retain the above copyright
15 * notice, this list of conditions and the following disclaimer.
16 * 2. Redistributions in binary form must reproduce the above copyright
17 * notice, this list of conditions and the following disclaimer in the
18 * documentation and/or other materials provided with the distribution.
19 * 3. All advertising materials mentioning features or use of this software
20 * must display the following acknowledgment:
21 * This product includes software developed by the University of
22 * California, Berkeley and its contributors.
23 * 4. Neither the name of the University nor the names of its contributors
24 * may be used to endorse or promote products derived from this software
25 * without specific prior written permission.
27 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
28 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
29 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
30 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
31 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
32 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
33 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
34 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
35 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
36 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
40 * File: am-utils/amd/info_union.c
45 * Get info from the system namespace
47 * NOTE: Cannot handle reads back through the automounter.
48 * THIS WILL CAUSE A DEADLOCK!
53 #endif /* HAVE_CONFIG_H */
57 #define UNION_PREFIX "union:"
58 #define UNION_PREFLEN 6
60 /* forward declarations */
61 int union_init(mnt_map *m, char *map, time_t *tp);
62 int union_search(mnt_map *m, char *map, char *key, char **pval, time_t *tp);
63 int union_reload(mnt_map *m, char *map, void (*fn) (mnt_map *, char *, char *));
67 * No way to probe - check the map name begins with "union:"
70 union_init(mnt_map *m, char *map, time_t *tp)
73 return NSTREQ(map, UNION_PREFIX, UNION_PREFLEN) ? 0 : ENOENT;
78 union_search(mnt_map *m, char *map, char *key, char **pval, time_t *tp)
80 char *mapd = strdup(map + UNION_PREFLEN);
81 char **v = strsplit(mapd, ':', '\"');
85 for (p = v; p[1]; p++) ;
88 xsnprintf(*pval, l, "fs:=%s", *p);
96 union_reload(mnt_map *m, char *map, void (*fn) (mnt_map *, char *, char *))
98 char *mapd = strdup(map + UNION_PREFLEN);
99 char **v = strsplit(mapd, ':', '\"');
103 * Add fake /defaults entry
105 (*fn) (m, strdup("/defaults"), strdup("type:=link;opts:=nounmount;sublink:=${key}"));
107 for (dir = v; *dir; dir++) {
111 DIR *dirp = opendir(*dir);
113 plog(XLOG_USER, "Cannot read directory %s: %m", *dir);
116 l = strlen(*dir) + 5;
118 dlog("Reading directory %s...", *dir);
119 while ((dp = readdir(dirp))) {
120 char *val, *dpname = &dp->d_name[0];
121 if (dpname[0] == '.' &&
122 (dpname[1] == '\0' ||
123 (dpname[1] == '.' && dpname[2] == '\0')))
126 dlog("... gives %s", dp->d_name);
128 xsnprintf(val, l + 5, "fs:=%s", *dir);
129 (*fn) (m, strdup(dp->d_name), val);
138 size_t l = strlen(*(dir-1)) + 5;
139 char *val = xmalloc(l);
141 xsnprintf(val, l, "fs:=%s", *(dir-1));
142 (*fn) (m, strdup("*"), val);