/* $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 <config.h>
#endif /* HAVE_CONFIG_H */
#include <am_defs.h>
#include <amd.h>
#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;
}
