[gnome-software] trivial: Check the AppStream metdata for sanity in flatpak bundles

[Richard Hughes <rhughes src gnome org>]

commit 86fb55189c5d1c0ad6fd95299201cd55d0bda210
Author: Richard Hughes <richard hughsie com>
Date:   Fri Jul 15 13:32:41 2016 +0100

    trivial: Check the AppStream metdata for sanity in flatpak bundles

 src/plugins/gs-flatpak.c |   20 ++++++++++++++++++++
 1 files changed, 20 insertions(+), 0 deletions(-)
---
diff --git a/src/plugins/gs-flatpak.c b/src/plugins/gs-flatpak.c
index 7dc8bba..f1b3a87 100644
--- a/src/plugins/gs-flatpak.c
+++ b/src/plugins/gs-flatpak.c
@@ -1537,6 +1537,26 @@ gs_flatpak_file_to_app_bundle (GsFlatpak *self,
                if (!as_store_from_bytes (store, appstream, cancellable, error))
                        return FALSE;
 
+               /* allow peeking into this for debugging */
+               if (g_getenv ("GS_FLATPAK_DEBUG_APPSTREAM") != NULL) {
+                       g_autoptr(GString) str = NULL;
+                       str = as_store_to_xml (store,
+                                              AS_NODE_TO_XML_FLAG_FORMAT_MULTILINE |
+                                              AS_NODE_TO_XML_FLAG_FORMAT_INDENT);
+                       g_debug ("showing AppStream data: %s", str->str);
+               }
+
+               /* check for sanity */
+               if (as_store_get_size (store) == 0) {
+                       g_set_error_literal (error,
+                                            GS_PLUGIN_ERROR,
+                                            GS_PLUGIN_ERROR_NOT_SUPPORTED,
+                                            "no apps found in AppStream data");
+                       return FALSE;
+               }
+               g_debug ("%i applications found in AppStream data",
+                        as_store_get_size (store));
+
                /* find app */
                id = g_strdup_printf ("%s.desktop", gs_app_get_flatpak_name (app));
                item = as_store_get_app_by_id (store, id);