[tracker-miners/wip/carlosg/miner-fs-fixes: 3/5] tracker-miner-fs: Change nfo:belongsToContainer after updating InformationElement

[Carlos Garnacho <carlosg src gnome org>]

commit 0faa154daced7b477945a592991277aa1ca99d44
Author: Carlos Garnacho <carlosg gnome org>
Date:   Sun May 17 16:57:47 2020 +0200

    tracker-miner-fs: Change nfo:belongsToContainer after updating InformationElement
    
    In the case of a folder update (and a rewrite of its nfo:Folder), all elements
    that had nfo:belongsToContainer pointing to this resource would be left pointing
    to the no longer existing resource.
    
    Ensure those get properly updated, together with the new InformationElement.

 src/miners/fs/tracker-miner-files.c | 29 +++++++++++++++++++++++++++--
 1 file changed, 27 insertions(+), 2 deletions(-)
---
diff --git a/src/miners/fs/tracker-miner-files.c b/src/miners/fs/tracker-miner-files.c
index b9fd3fb2d..316aa8f74 100644
--- a/src/miners/fs/tracker-miner-files.c
+++ b/src/miners/fs/tracker-miner-files.c
@@ -2438,7 +2438,7 @@ process_file_cb (GObject      *object,
        TrackerResource *resource, *element_resource;
        ProcessFileData *data;
        const gchar *mime_type;
-       gchar *parent_urn;
+       gchar *parent_urn, *update_relations_sparql = NULL;
        gchar *delete_properties_sparql = NULL, *mount_point_sparql;
        GFileInfo *file_info;
        guint64 time_;
@@ -2538,6 +2538,30 @@ process_file_cb (GObject      *object,
                                                                   mime_type,
                                                                   is_directory);
 
+       if (element_resource && is_directory &&
+           tracker_miner_fs_get_urn (TRACKER_MINER_FS (data->miner), file)) {
+               /* Directories need to have the child nfo:FileDataObjects
+                * updated to point to the new nfo:Folder.
+                */
+               update_relations_sparql =
+                       g_strdup_printf ("DELETE {"
+                                        "  GRAPH " DEFAULT_GRAPH " {"
+                                        "    ?u nfo:belongsToContainer ?ie "
+                                        "  }"
+                                        "} INSERT {"
+                                        "  GRAPH " DEFAULT_GRAPH " {"
+                                        "    ?u nfo:belongsToContainer %s "
+                                        "  }"
+                                        "} WHERE {"
+                                        "  GRAPH " DEFAULT_GRAPH " {"
+                                        "    ?u nfo:belongsToContainer ?ie . "
+                                        "    ?ie nie:isStoredAs <%s> "
+                                        "  }"
+                                        "}",
+                                        tracker_resource_get_identifier (element_resource),
+                                        uri);
+       }
+
        mount_point_sparql = update_mount_point_sparql (data);
        sparql_update_str = tracker_resource_print_sparql_update (resource, NULL, DEFAULT_GRAPH);
 
@@ -2552,7 +2576,8 @@ process_file_cb (GObject      *object,
                                                                      DEFAULT_GRAPH);
        }
 
-       sparql_str = g_strdup_printf ("%s %s %s %s",
+       sparql_str = g_strdup_printf ("%s %s %s %s %s",
+                                     update_relations_sparql ? update_relations_sparql : "",
                                      delete_properties_sparql ? delete_properties_sparql : "",
                                      sparql_update_str,
                                      ie_update_str ? ie_update_str : "",