[gnome-builder] flatpak: ensure we have access to documents portal

[Christian Hergert <chergert src gnome org>]

commit bc77540dd3257ab5e21d66b119ccce542753e688
Author: Christian Hergert <chergert redhat com>
Date:   Tue Nov 12 10:59:38 2019 -0800

    flatpak: ensure we have access to documents portal
    
    The documents portal should auto-start but we need to query it to ensure
    that happens. This shouldn't be happening if Builder itself is run with
    Flatpak, but there are still some cases where people are not using the
    Builder flatpak even that is the only supported upstream use.
    
    Fixes #1055

 src/plugins/flatpak/gbp-flatpak-pipeline-addin.c | 26 ++++++++++++++++++++++++
 1 file changed, 26 insertions(+)
---
diff --git a/src/plugins/flatpak/gbp-flatpak-pipeline-addin.c 
b/src/plugins/flatpak/gbp-flatpak-pipeline-addin.c
index aff275be4..e085fe632 100644
--- a/src/plugins/flatpak/gbp-flatpak-pipeline-addin.c
+++ b/src/plugins/flatpak/gbp-flatpak-pipeline-addin.c
@@ -63,6 +63,27 @@ enum {
   EXPORT_BUILD_BUNDLE,
 };
 
+static void
+ensure_documents_portal (void)
+{
+  g_autoptr(GDBusConnection) bus = g_bus_get_sync (G_BUS_TYPE_SESSION, NULL, NULL);
+  g_autoptr(GVariant) reply = NULL;
+
+  g_assert (G_IS_DBUS_CONNECTION (bus));
+
+  reply = g_dbus_connection_call_sync (bus,
+                                       "org.freedesktop.portal.Documents",
+                                       "/org/freedesktop/portal/documents",
+                                       "org.freedesktop.portal.Documents",
+                                       "GetMountPoint",
+                                       g_variant_new ("()"),
+                                       NULL,
+                                       G_DBUS_CALL_FLAGS_NONE,
+                                       3000,
+                                       NULL,
+                                       NULL);
+}
+
 static gchar *
 get_arch_option (IdePipeline *pipeline)
 {
@@ -210,6 +231,11 @@ check_for_build_init_files (IdePipelineStage    *stage,
   g_assert (!cancellable || G_IS_CANCELLABLE (cancellable));
   g_assert (staging_dir != NULL);
 
+  /* First make sure that we have access to the Portals service
+   * so that any of our build operations succeed.
+   */
+  ensure_documents_portal ();
+
   metadata = g_build_filename (staging_dir, "metadata", NULL);
   files = g_build_filename (staging_dir, "files", NULL);
   var = g_build_filename (staging_dir, "var", NULL);