binaryregistry: ignore the plugin cache if the filter environment has changed

Make sure that we properly update the registry and the cache file whenever
the filter environment changes or there's no more filter set.

gst/gst_private.h

@@ -75,6 +75,8 @@ struct _GstPluginPrivate {
 
 gboolean priv_gst_plugin_loading_have_whitelist (void);
 
+guint32  priv_gst_plugin_loading_get_whitelist_hash (void);
+
 gboolean priv_gst_plugin_desc_is_whitelisted (GstPluginDesc * desc,
                                               const gchar   * filename);
 

gst/gstplugin.c

@@ -463,6 +463,21 @@ priv_gst_plugin_loading_have_whitelist (void)
   return (_plugin_loading_whitelist != NULL);
 }
 
+guint32
+priv_gst_plugin_loading_get_whitelist_hash (void)
+{
+  guint32 hash = 0;
+
+  if (_plugin_loading_whitelist != NULL) {
+    gchar **w;
+
+    for (w = _plugin_loading_whitelist; *w != NULL; ++w)
+      hash = (hash << 1) ^ g_str_hash (*w);
+  }
+
+  return hash;
+}
+
 /* this function could be extended to check if the plugin license matches the
  * applications license (would require the app to register its license somehow).
  * We'll wait for someone who's interested in it to code it :)

gst/gstregistrybinary.c

@@ -377,6 +377,9 @@ gst_registry_binary_write_cache (GstRegistry * registry, const char *location)
     }
   }
 
+  _priv_gst_registry_chunks_save_global_header (&to_write, registry,
+      priv_gst_plugin_loading_get_whitelist_hash ());
+
   GST_INFO ("Writing binary registry cache");
 
   cache = gst_registry_binary_cache_init (registry, location);
@@ -495,6 +498,7 @@ gst_registry_binary_read_cache (GstRegistry * registry, const char *location)
   gsize size;
   GError *err = NULL;
   gboolean res = FALSE;
+  guint32 filter_env_hash = 0;
   gint check_magic_result;
 #ifndef GST_DISABLE_GST_DEBUG
   GTimer *timer = NULL;
@@ -554,6 +558,18 @@ gst_registry_binary_read_cache (GstRegistry * registry, const char *location)
     goto Error;
   }
 
+  if (!_priv_gst_registry_chunks_load_global_header (registry, &in,
+          contents + size, &filter_env_hash)) {
+    GST_ERROR ("Couldn't read global header chunk");
+    goto Error;
+  }
+
+  if (filter_env_hash != priv_gst_plugin_loading_get_whitelist_hash ()) {
+    GST_INFO_OBJECT (registry, "Plugin loading filter environment changed, "
+        "ignoring plugin cache to force update with new filter environment");
+    goto done;
+  }
+
   /* check if there are plugins in the file */
   if (G_UNLIKELY (!(((gsize) in + sizeof (GstRegistryChunkPluginElement)) <
               (gsize) contents + size))) {
@@ -575,6 +591,8 @@ gst_registry_binary_read_cache (GstRegistry * registry, const char *location)
     }
   }
 
+done:
+
 #ifndef GST_DISABLE_GST_DEBUG
   g_timer_stop (timer);
   seconds = g_timer_elapsed (timer, NULL);

gst/gstregistrybinary.h

@@ -55,7 +55,7 @@ G_BEGIN_DECLS
  * This _must_ be updated whenever the registry format changes,
  * we currently use the core version where this change happened.
  */
-#define GST_MAGIC_BINARY_VERSION_STR ("0.10.23.1")
+#define GST_MAGIC_BINARY_VERSION_STR ("0.10.29.1")
 
 /*
  * GST_MAGIC_BINARY_VERSION_LEN:

gst/gstregistrychunks.c

@@ -837,3 +837,39 @@ fail:
   GST_INFO ("Reading plugin failed after %u bytes", (guint) (end - start));
   return FALSE;
 }
+
+void
+_priv_gst_registry_chunks_save_global_header (GList ** list,
+    GstRegistry * registry, guint32 filter_env_hash)
+{
+  GstRegistryChunkGlobalHeader *hdr;
+  GstRegistryChunk *chk;
+
+  hdr = g_slice_new (GstRegistryChunkGlobalHeader);
+  chk = gst_registry_chunks_make_data (hdr,
+      sizeof (GstRegistryChunkGlobalHeader));
+
+  hdr->filter_env_hash = filter_env_hash;
+
+  *list = g_list_prepend (*list, chk);
+
+  GST_LOG ("Saved global header (filter_env_hash=0x%08x)", filter_env_hash);
+}
+
+gboolean
+_priv_gst_registry_chunks_load_global_header (GstRegistry * registry,
+    gchar ** in, gchar * end, guint32 * filter_env_hash)
+{
+  GstRegistryChunkGlobalHeader *hdr;
+
+  align (*in);
+  GST_LOG ("Reading/casting for GstRegistryChunkGlobalHeader at %p", *in);
+  unpack_element (*in, hdr, GstRegistryChunkGlobalHeader, end, fail);
+  *filter_env_hash = hdr->filter_env_hash;
+  return TRUE;
+
+  /* Errors */
+fail:
+  GST_WARNING ("Reading global header failed");
+  return FALSE;
+}

gst/gstregistrychunks.h

@@ -50,6 +50,11 @@ typedef struct _GstRegistryChunk
   gboolean align;
 } GstRegistryChunk;
 
+typedef struct _GstRegistryChunkGlobalHeader
+{
+  guint32  filter_env_hash;
+} GstRegistryChunkGlobalHeader;
+
 /*
  * GstRegistryChunkPluginElement:
  *
@@ -147,6 +152,14 @@ gboolean
 _priv_gst_registry_chunks_load_plugin (GstRegistry * registry, gchar ** in,
     gchar *end, GstPlugin **out_plugin);
 
+void
+_priv_gst_registry_chunks_save_global_header (GList ** list,
+    GstRegistry * registry, guint32 filter_env_hash);
+
+gboolean
+_priv_gst_registry_chunks_load_global_header (GstRegistry * registry,
+    gchar ** in, gchar *end, guint32 * filter_env_hash);
+
 void
 _priv_gst_registry_chunk_free (GstRegistryChunk *chunk);