src/configuration-pathname.c

   1 /* $Id$
   2  * UDP Gateway persistent configuration pathname detection
   3  * Copyright (C) 2005 Jan Kratochvil <project-udpgate@jankratochvil.net>
   4  *
   5  * This program is free software; you can redistribute it and/or modify
   6  * it under the terms of the GNU General Public License as published by
   7  * the Free Software Foundation; exactly version 2 of June 1991 is required
   8  *
   9  * This program is distributed in the hope that it will be useful,
  10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12  * GNU General Public License for more details.
  13  *
  14  * You should have received a copy of the GNU General Public License
  15  * along with this program; if not, write to the Free Software
  16  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  17  */
  18
  19
  20 #include "config.h"
  21
  22 #include <glib/gmessages.h>
  23 #include <glib/gmem.h>
  24 #include <glib/gstrfuncs.h>
  25 #include <stdlib.h>
  26 #include <unistd.h>
  27 #include <errno.h>
  28
  29 #include "configuration-pathname.h"     /* self */
  30
  31
  32 /* OK, GConf would be nice.
  33  * Unfortunately the fully-static build does not support GConf process spawn at
  34  * all. Also /etc/sysconfig directory is standard for the daemon services.
  35  */
  36
  37
  38 static const gchar *static_pathname;
  39 static gboolean verbose=FALSE;
  40
  41
  42 static gboolean try_pairname(const gchar *dirname,const gchar *filename)
  43 {
  44 gchar *pathname;
  45
  46         g_return_val_if_fail(dirname!=NULL,FALSE);
  47         g_return_val_if_fail(filename!=NULL,FALSE);
  48
  49         if (static_pathname)
  50                 return FALSE;
  51         if (access(dirname,W_OK|X_OK)) {
  52                 if (verbose)
  53                         g_warning(_("Configuration directory not accessible(X) and/or writable(W): %s"),dirname);
  54                 return FALSE;
  55                 }
  56         pathname=g_strdup_printf("%s/%s",dirname,filename);
  57         if (access(pathname,R_OK|W_OK) && errno!=ENOENT) {
  58                 if (verbose)
  59                         g_warning(_("Configuration pathname not readable(R) and/or writable(W): %s"),pathname);
  60                 g_free(pathname);
  61                 return FALSE;
  62                 }
  63         static_pathname=pathname;
  64         return TRUE;
  65 }
  66
  67 G_CONST_RETURN gchar *configuration_pathname(void)
  68 {
  69 const gchar *home_val;
  70 static gboolean first=TRUE;
  71
  72         if (!static_pathname && first) {
  73                 try_pairname(G_STRINGIFY(SYSCONFDIR) "/sysconfig",PACKAGE);
  74                 try_pairname(G_STRINGIFY(SYSCONFDIR) "/default",PACKAGE);
  75                 try_pairname(G_STRINGIFY(SYSCONFDIR) "",PACKAGE);
  76                 if ((home_val=getenv("HOME")))
  77                         try_pairname(home_val,"." PACKAGE "rc");
  78                 if (!static_pathname && !verbose) {
  79                         verbose=TRUE;
  80                         configuration_pathname();
  81                         g_warning(_("All automatic configuration pathnames failed; configuration persistency disabled."));
  82                         }
  83                 first=FALSE;
  84                 }
  85         return static_pathname;
  86 }