1 /*
2 * Copyright (c) 1990 Jan-Simon Pendry
3 * Copyright (c) 1990 Imperial College of Science, Technology & Medicine
4 * Copyright (c) 1990, 1993
5 * The Regents of the University of California. All rights reserved.
6 *
7 * This code is derived from software contributed to Berkeley by
8 * Jan-Simon Pendry at Imperial College, London.
9 *
10 * %sccs.include.redist.c%
11 *
12 * @(#)info_union.c 8.1 (Berkeley) 06/06/93
13 *
14 * $Id: info_union.c,v 5.2.2.1 1992/02/09 15:08:34 jsp beta $
15 *
16 */
17
18 /*
19 * Get info from the system namespace
20 *
21 * NOTE: Cannot handle reads back through the automounter.
22 * THIS WILL CAUSE A DEADLOCK!
23 */
24
25 #include "am.h"
26
27 #ifdef HAS_UNION_MAPS
28
29 #ifdef _POSIX_SOURCE
30 #include <dirent.h>
31 #define DIRENT struct dirent
32 #else
33 #include <sys/dir.h>
34 #define DIRENT struct direct
35 #endif
36
37 #define UNION_PREFIX "union:"
38 #define UNION_PREFLEN 6
39
40 /*
41 * No way to probe - check the map name begins with "union:"
42 */
43 int union_init P((char *map, time_t *tp));
union_init(map,tp)44 int union_init(map, tp)
45 char *map;
46 time_t *tp;
47 {
48 *tp = 0;
49 return strncmp(map, UNION_PREFIX, UNION_PREFLEN) == 0 ? 0 : ENOENT;
50 }
51
52 int union_search P((mnt_map *m, char *map, char *key, char **pval, time_t *tp));
union_search(m,map,key,pval,tp)53 int union_search(m, map, key, pval, tp)
54 mnt_map *m;
55 char *map;
56 char *key;
57 char **pval;
58 time_t *tp;
59 {
60 char *mapd = strdup(map + UNION_PREFLEN);
61 char **v = strsplit(mapd, ':', '\"');
62 char **p;
63 for (p = v; p[1]; p++)
64 ;
65 *pval = xmalloc(strlen(*p) + 5);
66 sprintf(*pval, "fs:=%s", *p);
67 free(mapd);
68 free(v);
69 return 0;
70 }
71
72 int union_reload P((mnt_map *m, char *map, void (*fn)()));
union_reload(m,map,fn)73 int union_reload(m, map, fn)
74 mnt_map *m;
75 char *map;
76 void (*fn)();
77 {
78 char *mapd = strdup(map + UNION_PREFLEN);
79 char **v = strsplit(mapd, ':', '\"');
80 char **dir;
81
82 /*
83 * Add fake /defaults entry
84 */
85 (*fn)(m, strdup("/defaults"), strdup("type:=link;opts:=nounmount;sublink:=${key}"));
86
87 for (dir = v; *dir; dir++) {
88 int dlen;
89 DIRENT *dp;
90 DIR *dirp = opendir(*dir);
91 if (!dirp) {
92 plog(XLOG_USER, "Cannot read directory %s: %m", *dir);
93 continue;
94 }
95 dlen = strlen(*dir);
96 #ifdef DEBUG
97 dlog("Reading directory %s...", *dir);
98 #endif
99 while (dp = readdir(dirp)) {
100 char *val;
101 if (dp->d_name[0] == '.' &&
102 (dp->d_name[1] == '\0' ||
103 (dp->d_name[1] == '.' && dp->d_name[2] == '\0')))
104 continue;
105
106 #ifdef DEBUG
107 dlog("... gives %s", dp->d_name);
108 #endif
109 val = xmalloc(dlen + 5);
110 sprintf(val, "fs:=%s", *dir);
111 (*fn)(m, strdup(dp->d_name), val);
112 }
113 closedir(dirp);
114 }
115 /*
116 * Add wildcard entry
117 */
118 { char *val = xmalloc(strlen(dir[-1]) + 5);
119 sprintf(val, "fs:=%s", dir[-1]);
120 (*fn)(m, strdup("*"), val);
121 }
122 free(mapd);
123 free(v);
124 return 0;
125 }
126
127 #endif /* HAS_UNION_MAPS */
128