Allow aux_cache_file open()ing to fail silently even in the chroot mode.

The aux_cache fix of bug 11149 introduced a new bug - normally,
ldconfig -r never cares if the auxiliary cache is not available and
that is not a fatal problem, however this is not the case in case
of ldconfig -r when executed as non-root. In that case, ldconfig -r
fails hard unless var/cache/ldconfig/ exists within the chroot. This
patch fixes that.

Conflicts:

	ChangeLog
(cherry picked from commit 6db52fb)

ChangeLog

@@ -1,3 +1,9 @@
+2010-05-31  Petr Baudis  <pasky@suse.cz>
+
+	[BZ #11149]
+	* elf/ldconfig.c (main): Allow aux_cache_file open()ing to fail
+	silently even in the chroot mode.
+
 2010-05-31  Petr Baudis <pasky@suse.cz>
 
 	[BZ #10085]

elf/ldconfig.c

@@ -1359,14 +1359,9 @@ main (int argc, char **argv)
 
   const char *aux_cache_file = _PATH_LDCONFIG_AUX_CACHE;
   if (opt_chroot)
-    {
-      aux_cache_file = chroot_canon (opt_chroot, aux_cache_file);
-      if (aux_cache_file == NULL)
-	error (EXIT_FAILURE, errno, _("Can't open cache file %s\n"),
-	       _PATH_LDCONFIG_AUX_CACHE);
-    }
+    aux_cache_file = chroot_canon (opt_chroot, aux_cache_file);
 
-  if (! opt_ignore_aux_cache)
+  if (! opt_ignore_aux_cache && aux_cache_file)
     load_aux_cache (aux_cache_file);
   else
     init_aux_cache ();
@@ -1376,7 +1371,8 @@ main (int argc, char **argv)
   if (opt_build_cache)
     {
       save_cache (cache_file);
-      save_aux_cache (aux_cache_file);
+      if (aux_cache_file)
+        save_aux_cache (aux_cache_file);
     }
 
   return 0;