[glib] _g_dbus_get_machine_id(): check /etc/machine-id too

[Matthias Clasen <matthiasc src gnome org>]

commit dc89b51c2d71088c014ec94572629aabf143310e
Author: Alexandre Rostovtsev <tetromino gentoo org>
Date:   Wed Nov 16 15:05:46 2011 +0000

    _g_dbus_get_machine_id(): check /etc/machine-id too
    
    machine-id can be in /etc or in /var/lib/dbus.
    
    [amended with slightly revised error handling -smcv]
    
    Bug: https://bugzilla.gnome.org/show_bug.cgi?id=663928

 gio/gdbusprivate.c |   13 +++++++++++--
 1 files changed, 11 insertions(+), 2 deletions(-)
---
diff --git a/gio/gdbusprivate.c b/gio/gdbusprivate.c
index 55ac883..9149aab 100644
--- a/gio/gdbusprivate.c
+++ b/gio/gdbusprivate.c
@@ -1983,17 +1983,26 @@ gchar *
 _g_dbus_get_machine_id (GError **error)
 {
   gchar *ret;
+  GError *first_error;
   /* TODO: use PACKAGE_LOCALSTATEDIR ? */
   ret = NULL;
+  first_error = NULL;
   if (!g_file_get_contents ("/var/lib/dbus/machine-id",
                             &ret,
                             NULL,
-                            error))
+                            &first_error) &&
+      !g_file_get_contents ("/etc/machine-id",
+                            &ret,
+                            NULL,
+                            NULL))
     {
-      g_prefix_error (error, _("Unable to load /var/lib/dbus/machine-id: "));
+      g_propagate_prefixed_error (error, first_error,
+                                  _("Unable to load /var/lib/dbus/machine-id or /etc/machine-id: "));
     }
   else
     {
+      /* ignore the error from the first try, if any */
+      g_clear_error (&first_error);
       /* TODO: validate value */
       g_strstrip (ret);
     }