[grilo-plugins/wip/hadess/tracker3-auto-flatpak] tracker3: Handle sandboxed tracker3 automatically

[Bastien Nocera <hadess src gnome org>]

commit a29fead4bde2171dd1acb87dab4b72d588c3e351
Author: Bastien Nocera <hadess hadess net>
Date:   Wed Aug 26 14:47:09 2020 +0200

    tracker3: Handle sandboxed tracker3 automatically
    
    When running under Flatpak, and if the application isn't allowed to talk to
    Tracker 3 outside the sandbox, assume that the miners run inside the
    sandbox and change the service name as appropriate.

 src/tracker3/grl-tracker.c | 26 ++++++++++++++++++++++++++
 1 file changed, 26 insertions(+)
---
diff --git a/src/tracker3/grl-tracker.c b/src/tracker3/grl-tracker.c
index a07dbd20..d91158a8 100644
--- a/src/tracker3/grl-tracker.c
+++ b/src/tracker3/grl-tracker.c
@@ -89,6 +89,29 @@ tracker_new_connection_cb (GObject      *object,
   init_sources ();
 }
 
+static void
+set_miner_service (void)
+{
+  g_autoptr(GKeyFile) keyfile = NULL;
+  const char *value;
+
+  if (!g_file_test ("/.flatpak-info", G_FILE_TEST_EXISTS))
+    return;
+
+  keyfile = g_key_file_new ();
+  if (!g_key_file_load_from_file (keyfile, "/.flatpak-info", G_KEY_FILE_NONE, NULL))
+    return;
+
+  value = g_key_file_get_value (keyfile, "Session Bus Policy", "org.freedesktop.Tracker3.Miner.Files", NULL);
+  if (value && g_str_equal (value, "talk"))
+    return;
+
+  value = g_key_file_get_string (keyfile, "Application", "name", NULL);
+  grl_tracker_miner_service = g_strdup_printf ("%s.Miner.Files", value);
+  GRL_INFO("\tRunning in sandboxed mode, using %s as miner service",
+           grl_tracker_miner_service);
+}
+
 gboolean
 grl_tracker3_plugin_init (GrlRegistry *registry,
                           GrlPlugin *plugin,
@@ -125,6 +148,9 @@ grl_tracker3_plugin_init (GrlRegistry *registry,
       grl_config_get_string (config, "miner-service");
   }
 
+  if (!grl_tracker_miner_service)
+    set_miner_service ();
+
   grl_tracker_plugin_init_cancel = g_cancellable_new ();
   if (grl_tracker_store_path) {
     store = g_file_new_for_path (grl_tracker_store_path);