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freebsd/usr.sbin/amd/amd/info_union.c
1994-05-26 05:23:31 +00:00

154 lines
4.3 KiB
C

/*
* Copyright (c) 1990 Jan-Simon Pendry
* Copyright (c) 1990 Imperial College of Science, Technology & Medicine
* Copyright (c) 1990, 1993
* 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. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by the University of
* California, Berkeley and its contributors.
* 4. 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.
*
* @(#)info_union.c 8.1 (Berkeley) 6/6/93
*
* $Id: info_union.c,v 5.2.2.1 1992/02/09 15:08:34 jsp beta $
*
*/
/*
* Get info from the system namespace
*
* NOTE: Cannot handle reads back through the automounter.
* THIS WILL CAUSE A DEADLOCK!
*/
#include "am.h"
#ifdef HAS_UNION_MAPS
#ifdef _POSIX_SOURCE
#include <dirent.h>
#define DIRENT struct dirent
#else
#include <sys/dir.h>
#define DIRENT struct direct
#endif
#define UNION_PREFIX "union:"
#define UNION_PREFLEN 6
/*
* No way to probe - check the map name begins with "union:"
*/
int union_init P((char *map, time_t *tp));
int union_init(map, tp)
char *map;
time_t *tp;
{
*tp = 0;
return strncmp(map, UNION_PREFIX, UNION_PREFLEN) == 0 ? 0 : ENOENT;
}
int union_search P((mnt_map *m, char *map, char *key, char **pval, time_t *tp));
int union_search(m, map, key, pval, tp)
mnt_map *m;
char *map;
char *key;
char **pval;
time_t *tp;
{
char *mapd = strdup(map + UNION_PREFLEN);
char **v = strsplit(mapd, ':', '\"');
char **p;
for (p = v; p[1]; p++)
;
*pval = xmalloc(strlen(*p) + 5);
sprintf(*pval, "fs:=%s", *p);
free(mapd);
free(v);
return 0;
}
int union_reload P((mnt_map *m, char *map, void (*fn)()));
int union_reload(m, map, fn)
mnt_map *m;
char *map;
void (*fn)();
{
char *mapd = strdup(map + UNION_PREFLEN);
char **v = strsplit(mapd, ':', '\"');
char **dir;
/*
* Add fake /defaults entry
*/
(*fn)(m, strdup("/defaults"), strdup("type:=link;opts:=nounmount;sublink:=${key}"));
for (dir = v; *dir; dir++) {
int dlen;
DIRENT *dp;
DIR *dirp = opendir(*dir);
if (!dirp) {
plog(XLOG_USER, "Cannot read directory %s: %m", *dir);
continue;
}
dlen = strlen(*dir);
#ifdef DEBUG
dlog("Reading directory %s...", *dir);
#endif
while (dp = readdir(dirp)) {
char *val;
if (dp->d_name[0] == '.' &&
(dp->d_name[1] == '\0' ||
(dp->d_name[1] == '.' && dp->d_name[2] == '\0')))
continue;
#ifdef DEBUG
dlog("... gives %s", dp->d_name);
#endif
val = xmalloc(dlen + 5);
sprintf(val, "fs:=%s", *dir);
(*fn)(m, strdup(dp->d_name), val);
}
closedir(dirp);
}
/*
* Add wildcard entry
*/
{ char *val = xmalloc(strlen(dir[-1]) + 5);
sprintf(val, "fs:=%s", dir[-1]);
(*fn)(m, strdup("*"), val);
}
free(mapd);
free(v);
return 0;
}
#endif /* HAS_UNION_MAPS */