[gnome-software] Add functionality which enables us to find symbols in enabled plugins

[Richard Hughes <rhughes src gnome org>]

commit c06a5868e5e45108c2682b0b8aa33bd9a437767e
Author: Richard Hughes <richard hughsie com>
Date:   Tue Feb 9 10:51:48 2016 +0000

    Add functionality which enables us to find symbols in enabled plugins
    
    This is a more general version of a patch from Robert Ancell, many thanks.

 src/gs-plugin-loader.c |   27 +++++++++++++++++++++++++++
 src/gs-plugin-loader.h |    2 ++
 2 files changed, 29 insertions(+), 0 deletions(-)
---
diff --git a/src/gs-plugin-loader.c b/src/gs-plugin-loader.c
index a504be3..9149491 100644
--- a/src/gs-plugin-loader.c
+++ b/src/gs-plugin-loader.c
@@ -3695,6 +3695,33 @@ gs_plugin_loader_offline_update_finish (GsPluginLoader *plugin_loader,
        return g_task_propagate_boolean (G_TASK (res), error);
 }
 
+/**
+ * gs_plugin_loader_get_plugin_supported:
+ *
+ * This function returns TRUE if the symbol is found in any enabled plugin.
+ */
+gboolean
+gs_plugin_loader_get_plugin_supported (GsPluginLoader *plugin_loader,
+                                      const gchar *function_name)
+{
+       GsPluginLoaderPrivate *priv = gs_plugin_loader_get_instance_private (plugin_loader);
+       gboolean ret;
+       gpointer dummy;
+       guint i;
+
+       for (i = 0; i < priv->plugins->len; i++) {
+               GsPlugin *plugin = g_ptr_array_index (priv->plugins, i);
+               if (!plugin->enabled)
+                       continue;
+               ret = g_module_symbol (plugin->module,
+                                      function_name,
+                                      (gpointer *) &dummy);
+               if (ret)
+                       return TRUE;
+       }
+       return FALSE;
+}
+
 /******************************************************************************/
 
 /* vim: set noexpandtab: */
diff --git a/src/gs-plugin-loader.h b/src/gs-plugin-loader.h
index 8dff2b3..48ede73 100644
--- a/src/gs-plugin-loader.h
+++ b/src/gs-plugin-loader.h
@@ -223,6 +223,8 @@ GsApp               *gs_plugin_loader_dedupe                (GsPluginLoader 
*plugin_loader,
                                                         GsApp          *app);
 void            gs_plugin_loader_set_network_status    (GsPluginLoader *plugin_loader,
                                                         gboolean        online);
+gboolean        gs_plugin_loader_get_plugin_supported  (GsPluginLoader *plugin_loader,
+                                                        const gchar    *plugin_func);
 
 G_END_DECLS