Adding upstream version 43.2.upstream/43.2upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 1019 insertions, 0 deletions

diff --git a/src/nautilus-tag-manager.c b/src/nautilus-tag-manager.c
new file mode 100644
index 0000000..959eee8
--- /dev/null
+++ b/src/nautilus-tag-manager.c
@@ -0,0 +1,1019 @@
+/* nautilus-tag-manager.c
+ *
+ * Copyright (C) 2017 Alexandru Pandelea <alexandru.pandelea@gmail.com>
+ * Copyright (C) 2020 Sam Thursfield <sam@afuera.me.uk>
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include "nautilus-tag-manager.h"
+#include "nautilus-file.h"
+#include "nautilus-file-undo-operations.h"
+#include "nautilus-file-undo-manager.h"
+#include "nautilus-tracker-utilities.h"
+#define DEBUG_FLAG NAUTILUS_DEBUG_TAG_MANAGER
+#include "nautilus-debug.h"
+
+#include <gio/gunixinputstream.h>
+#include <tracker-sparql.h>
+
+#include "config.h"
+
+struct _NautilusTagManager
+{
+    GObject object;
+
+    gboolean database_ok;
+    TrackerSparqlConnection *db;
+    TrackerNotifier *notifier;
+
+    TrackerSparqlStatement *query_starred_files;
+    TrackerSparqlStatement *query_file_is_starred;
+
+    GHashTable *starred_file_uris;
+    GFile *home;
+
+    GCancellable *cancellable;
+};
+
+G_DEFINE_TYPE (NautilusTagManager, nautilus_tag_manager, G_TYPE_OBJECT);
+
+static NautilusTagManager *tag_manager = NULL;
+
+/* See nautilus_tag_manager_new_dummy() documentation for details. */
+static gboolean make_dummy_instance = FALSE;
+
+typedef struct
+{
+    NautilusTagManager *tag_manager;
+    GTask *task;
+    GList *selection;
+    gboolean star;
+} UpdateData;
+
+enum
+{
+    STARRED_CHANGED,
+    LAST_SIGNAL
+};
+
+#define QUERY_STARRED_FILES \
+    "SELECT ?file " \
+    "{ " \
+    "    ?file a nautilus:File ; " \
+    "        nautilus:starred true . " \
+    "}"
+
+#define QUERY_FILE_IS_STARRED \
+    "ASK " \
+    "{ " \
+    "    ~file a nautilus:File ; " \
+    "        nautilus:starred true . " \
+    "}"
+
+static guint signals[LAST_SIGNAL];
+
+/* Limit to 10MB output from Tracker -- surely, nobody has over a million starred files. */
+#define TRACKER2_MAX_IMPORT_BYTES 10 * 1024 * 1024
+
+static gchar *
+tracker2_migration_stamp (void)
+{
+    return g_build_filename (g_get_user_data_dir (), "nautilus", "tracker2-migration-complete", NULL);
+}
+
+static void
+start_query_or_update (TrackerSparqlConnection *db,
+                       GString                 *query,
+                       GAsyncReadyCallback      callback,
+                       gpointer                 user_data,
+                       gboolean                 is_query,
+                       GCancellable            *cancellable)
+{
+    g_autoptr (GError) error = NULL;
+
+    if (!db)
+    {
+        g_message ("nautilus-tag-manager: No Tracker connection");
+        return;
+    }
+
+    if (is_query)
+    {
+        tracker_sparql_connection_query_async (db,
+                                               query->str,
+                                               cancellable,
+                                               callback,
+                                               user_data);
+    }
+    else
+    {
+        tracker_sparql_connection_update_async (db,
+                                                query->str,
+                                                cancellable,
+                                                callback,
+                                                user_data);
+    }
+}
+
+static void
+on_update_callback (GObject      *object,
+                    GAsyncResult *result,
+                    gpointer      user_data)
+{
+    TrackerSparqlConnection *db;
+    GError *error;
+    UpdateData *data;
+
+    data = user_data;
+
+    error = NULL;
+
+    db = TRACKER_SPARQL_CONNECTION (object);
+
+    tracker_sparql_connection_update_finish (db, result, &error);
+
+    if (error == NULL)
+    {
+        /* FIXME: make sure data->tag_manager->starred_file_uris is up to date */
+
+        if (!nautilus_file_undo_manager_is_operating ())
+        {
+            NautilusFileUndoInfo *undo_info;
+
+            undo_info = nautilus_file_undo_info_starred_new (data->selection, data->star);
+            nautilus_file_undo_manager_set_action (undo_info);
+
+            g_object_unref (undo_info);
+        }
+
+        g_signal_emit_by_name (data->tag_manager, "starred-changed", nautilus_file_list_copy (data->selection));
+
+        g_task_return_boolean (data->task, TRUE);
+        g_object_unref (data->task);
+    }
+    else if (error && error->code == G_IO_ERROR_CANCELLED)
+    {
+        g_error_free (error);
+    }
+    else
+    {
+        g_warning ("error updating tags: %s", error->message);
+        g_task_return_error (data->task, error);
+        g_object_unref (data->task);
+    }
+
+    nautilus_file_list_free (data->selection);
+    g_free (data);
+}
+
+/**
+ * nautilus_tag_manager_get_starred_files:
+ * @self: The tag manager singleton
+ *
+ * Returns: (element-type gchar*) (transfer container): A list of the starred urls.
+ */
+GList *
+nautilus_tag_manager_get_starred_files (NautilusTagManager *self)
+{
+    GHashTableIter starred_iter;
+    gchar *starred_uri;
+    GList *starred_file_uris = NULL;
+
+    g_hash_table_iter_init (&starred_iter, self->starred_file_uris);
+    while (g_hash_table_iter_next (&starred_iter, (gpointer *) &starred_uri, NULL))
+    {
+        g_autoptr (GFile) file = g_file_new_for_uri (starred_uri);
+
+        /* Skip files ouside $HOME, because we don't support starring these yet.
+         * See comment on nautilus_tag_manager_can_star_contents() */
+        if (g_file_has_prefix (file, self->home))
+        {
+            starred_file_uris = g_list_prepend (starred_file_uris, starred_uri);
+        }
+    }
+
+    return starred_file_uris;
+}
+
+static void
+on_get_starred_files_cursor_callback (GObject      *object,
+                                      GAsyncResult *result,
+                                      gpointer      user_data)
+{
+    TrackerSparqlCursor *cursor;
+    g_autoptr (GError) error = NULL;
+    const gchar *url;
+    gboolean success;
+    NautilusTagManager *self;
+    GList *changed_files;
+    NautilusFile *file;
+
+    cursor = TRACKER_SPARQL_CURSOR (object);
+
+    self = NAUTILUS_TAG_MANAGER (user_data);
+
+    success = tracker_sparql_cursor_next_finish (cursor, result, &error);
+
+    if (!success)
+    {
+        if (error != NULL)
+        {
+            g_warning ("Error on getting all tags cursor callback: %s", error->message);
+        }
+
+        g_clear_object (&cursor);
+        return;
+    }
+
+    url = tracker_sparql_cursor_get_string (cursor, 0, NULL);
+
+    g_hash_table_add (self->starred_file_uris, g_strdup (url));
+
+    file = nautilus_file_get_by_uri (url);
+
+    if (file)
+    {
+        changed_files = g_list_prepend (NULL, file);
+
+        g_signal_emit_by_name (self, "starred-changed", changed_files);
+
+        nautilus_file_list_free (changed_files);
+    }
+    else
+    {
+        DEBUG ("File %s is starred but not found", url);
+    }
+
+    tracker_sparql_cursor_next_async (cursor,
+                                      self->cancellable,
+                                      on_get_starred_files_cursor_callback,
+                                      self);
+}
+
+static void
+on_get_starred_files_query_callback (GObject      *object,
+                                     GAsyncResult *result,
+                                     gpointer      user_data)
+{
+    TrackerSparqlCursor *cursor;
+    g_autoptr (GError) error = NULL;
+    TrackerSparqlStatement *statement;
+    NautilusTagManager *self;
+
+    self = NAUTILUS_TAG_MANAGER (user_data);
+    statement = TRACKER_SPARQL_STATEMENT (object);
+
+    cursor = tracker_sparql_statement_execute_finish (statement,
+                                                      result,
+                                                      &error);
+
+    if (error != NULL)
+    {
+        if (error->code != G_IO_ERROR_CANCELLED)
+        {
+            g_warning ("Error on getting starred files: %s", error->message);
+        }
+    }
+    else
+    {
+        tracker_sparql_cursor_next_async (cursor,
+                                          self->cancellable,
+                                          on_get_starred_files_cursor_callback,
+                                          user_data);
+    }
+}
+
+static void
+nautilus_tag_manager_query_starred_files (NautilusTagManager *self,
+                                          GCancellable       *cancellable)
+{
+    if (!self->database_ok)
+    {
+        g_message ("nautilus-tag-manager: No Tracker connection");
+        return;
+    }
+
+    tracker_sparql_statement_execute_async (self->query_starred_files,
+                                            cancellable,
+                                            on_get_starred_files_query_callback,
+                                            self);
+}
+
+static GString *
+nautilus_tag_manager_delete_tag (NautilusTagManager *self,
+                                 GList              *selection)
+{
+    GString *query;
+    NautilusFile *file;
+    GList *l;
+
+    query = g_string_new ("DELETE DATA {");
+
+    for (l = selection; l != NULL; l = l->next)
+    {
+        g_autofree gchar *uri = NULL;
+
+        file = l->data;
+
+        uri = nautilus_file_get_uri (file);
+        g_string_append_printf (query,
+                                "    <%s> a nautilus:File ; "
+                                "        nautilus:starred true . ",
+                                uri);
+    }
+
+    g_string_append (query, "}");
+
+    return query;
+}
+
+static GString *
+nautilus_tag_manager_insert_tag (NautilusTagManager *self,
+                                 GList              *selection)
+{
+    GString *query;
+    NautilusFile *file;
+    GList *l;
+
+    query = g_string_new ("INSERT DATA {");
+
+    for (l = selection; l != NULL; l = l->next)
+    {
+        g_autofree gchar *uri = NULL;
+
+        file = l->data;
+
+        uri = nautilus_file_get_uri (file);
+        g_string_append_printf (query,
+                                "    <%s> a nautilus:File ; "
+                                "        nautilus:starred true . ",
+                                uri);
+    }
+
+    g_string_append (query, "}");
+
+    return query;
+}
+
+gboolean
+nautilus_tag_manager_file_is_starred (NautilusTagManager *self,
+                                      const gchar        *file_uri)
+{
+    return g_hash_table_contains (self->starred_file_uris, file_uri);
+}
+
+void
+nautilus_tag_manager_star_files (NautilusTagManager  *self,
+                                 GObject             *object,
+                                 GList               *selection,
+                                 GAsyncReadyCallback  callback,
+                                 GCancellable        *cancellable)
+{
+    GString *query;
+    g_autoptr (GError) error = NULL;
+    GTask *task;
+    UpdateData *update_data;
+
+    DEBUG ("Starring %i files", g_list_length (selection));
+
+    task = g_task_new (object, cancellable, callback, NULL);
+
+    query = nautilus_tag_manager_insert_tag (self, selection);
+
+    update_data = g_new0 (UpdateData, 1);
+    update_data->task = task;
+    update_data->tag_manager = self;
+    update_data->selection = nautilus_file_list_copy (selection);
+    update_data->star = TRUE;
+
+    start_query_or_update (self->db,
+                           query,
+                           on_update_callback,
+                           update_data,
+                           FALSE,
+                           cancellable);
+
+    g_string_free (query, TRUE);
+}
+
+void
+nautilus_tag_manager_unstar_files (NautilusTagManager  *self,
+                                   GObject             *object,
+                                   GList               *selection,
+                                   GAsyncReadyCallback  callback,
+                                   GCancellable        *cancellable)
+{
+    GString *query;
+    GTask *task;
+    UpdateData *update_data;
+
+    DEBUG ("Unstarring %i files", g_list_length (selection));
+
+    task = g_task_new (object, cancellable, callback, NULL);
+
+    query = nautilus_tag_manager_delete_tag (self, selection);
+
+    update_data = g_new0 (UpdateData, 1);
+    update_data->task = task;
+    update_data->tag_manager = self;
+    update_data->selection = nautilus_file_list_copy (selection);
+    update_data->star = FALSE;
+
+    start_query_or_update (self->db,
+                           query,
+                           on_update_callback,
+                           update_data,
+                           FALSE,
+                           cancellable);
+
+    g_string_free (query, TRUE);
+}
+
+static void
+on_tracker_notifier_events (TrackerNotifier *notifier,
+                            gchar           *service,
+                            gchar           *graph,
+                            GPtrArray       *events,
+                            gpointer         user_data)
+{
+    TrackerNotifierEvent *event;
+    NautilusTagManager *self;
+    int i;
+    const gchar *file_url;
+    GError *error = NULL;
+    TrackerSparqlCursor *cursor;
+    gboolean query_has_results = FALSE;
+    gboolean starred;
+    GList *changed_files;
+    NautilusFile *changed_file;
+
+    self = NAUTILUS_TAG_MANAGER (user_data);
+
+    for (i = 0; i < events->len; i++)
+    {
+        event = g_ptr_array_index (events, i);
+
+        file_url = tracker_notifier_event_get_urn (event);
+        changed_file = NULL;
+
+        DEBUG ("Got event for file %s", file_url);
+
+        tracker_sparql_statement_bind_string (self->query_file_is_starred, "file", file_url);
+        cursor = tracker_sparql_statement_execute (self->query_file_is_starred,
+                                                   NULL,
+                                                   &error);
+
+        if (cursor)
+        {
+            query_has_results = tracker_sparql_cursor_next (cursor, NULL, &error);
+        }
+
+        if (error || !cursor || !query_has_results)
+        {
+            g_warning ("Couldn't query the starred files database: '%s'", error ? error->message : "(null error)");
+            g_clear_error (&error);
+            return;
+        }
+
+        starred = tracker_sparql_cursor_get_boolean (cursor, 0);
+        if (starred)
+        {
+            gboolean inserted = g_hash_table_add (self->starred_file_uris, g_strdup (file_url));
+
+            if (inserted)
+            {
+                DEBUG ("Added %s to starred files list", file_url);
+                changed_file = nautilus_file_get_by_uri (file_url);
+            }
+        }
+        else
+        {
+            gboolean removed = g_hash_table_remove (self->starred_file_uris, file_url);
+
+            if (removed)
+            {
+                DEBUG ("Removed %s from starred files list", file_url);
+                changed_file = nautilus_file_get_by_uri (file_url);
+            }
+        }
+
+        if (changed_file)
+        {
+            changed_files = g_list_prepend (NULL, changed_file);
+
+            g_signal_emit_by_name (self, "starred-changed", changed_files);
+
+            nautilus_file_list_free (changed_files);
+        }
+
+        g_object_unref (cursor);
+    }
+}
+
+static void
+nautilus_tag_manager_finalize (GObject *object)
+{
+    NautilusTagManager *self;
+
+    self = NAUTILUS_TAG_MANAGER (object);
+
+    if (self->notifier != NULL)
+    {
+        g_signal_handlers_disconnect_by_func (self->notifier,
+                                              G_CALLBACK (on_tracker_notifier_events),
+                                              self);
+    }
+
+    g_cancellable_cancel (self->cancellable);
+    g_clear_object (&self->cancellable);
+    g_clear_object (&self->notifier);
+    g_clear_object (&self->db);
+    g_clear_object (&self->query_file_is_starred);
+    g_clear_object (&self->query_starred_files);
+
+    g_hash_table_destroy (self->starred_file_uris);
+    g_clear_object (&self->home);
+
+    G_OBJECT_CLASS (nautilus_tag_manager_parent_class)->finalize (object);
+}
+
+static void
+nautilus_tag_manager_class_init (NautilusTagManagerClass *klass)
+{
+    GObjectClass *oclass;
+
+    oclass = G_OBJECT_CLASS (klass);
+
+    oclass->finalize = nautilus_tag_manager_finalize;
+
+    signals[STARRED_CHANGED] = g_signal_new ("starred-changed",
+                                             NAUTILUS_TYPE_TAG_MANAGER,
+                                             G_SIGNAL_RUN_LAST,
+                                             0,
+                                             NULL,
+                                             NULL,
+                                             g_cclosure_marshal_VOID__POINTER,
+                                             G_TYPE_NONE,
+                                             1,
+                                             G_TYPE_POINTER);
+}
+
+/**
+ * nautilus_tag_manager_new:
+ *
+ * Returns: (transfer full): the #NautilusTagManager singleton object.
+ */
+NautilusTagManager *
+nautilus_tag_manager_new (void)
+{
+    if (tag_manager != NULL)
+    {
+        return g_object_ref (tag_manager);
+    }
+
+    tag_manager = g_object_new (NAUTILUS_TYPE_TAG_MANAGER, NULL);
+    g_object_add_weak_pointer (G_OBJECT (tag_manager), (gpointer) & tag_manager);
+
+    return tag_manager;
+}
+
+/**
+ * nautilus_tag_manager_new_dummy:
+ *
+ * Creates a dummy tag manager without database.
+ *
+ * Useful only for tests where the tag manager is needed but not being tested
+ * and we don't want to fail the tests due to irrelevant D-Bus failures.
+ *
+ * Returns: (transfer full): the #NautilusTagManager singleton object.
+ */
+NautilusTagManager *
+nautilus_tag_manager_new_dummy (void)
+{
+    make_dummy_instance = TRUE;
+    return nautilus_tag_manager_new ();
+}
+
+/**
+ * nautilus_tag_manager_get:
+ *
+ * Returns: (transfer none): the #NautilusTagManager singleton object.
+ */
+NautilusTagManager *
+nautilus_tag_manager_get (void)
+{
+    return tag_manager;
+}
+
+static gboolean
+setup_database (NautilusTagManager  *self,
+                GCancellable        *cancellable,
+                GError             **error)
+{
+    const gchar *datadir;
+    g_autofree gchar *store_path = NULL;
+    g_autofree gchar *ontology_path = NULL;
+    g_autoptr (GFile) store = NULL;
+    g_autoptr (GFile) ontology = NULL;
+
+    /* Open private database to store nautilus:starred property. */
+
+    datadir = NAUTILUS_DATADIR;
+
+    store_path = g_build_filename (g_get_user_data_dir (), "nautilus", "tags", NULL);
+    ontology_path = g_build_filename (datadir, "ontology", NULL);
+
+    store = g_file_new_for_path (store_path);
+    ontology = g_file_new_for_path (ontology_path);
+
+    self->db = tracker_sparql_connection_new (TRACKER_SPARQL_CONNECTION_FLAGS_NONE,
+                                              store,
+                                              ontology,
+                                              cancellable,
+                                              error);
+
+    if (*error)
+    {
+        return FALSE;
+    }
+
+    /* Prepare reusable queries. */
+    self->query_file_is_starred = tracker_sparql_connection_query_statement (self->db,
+                                                                             QUERY_FILE_IS_STARRED,
+                                                                             cancellable,
+                                                                             error);
+
+    if (*error)
+    {
+        return FALSE;
+    }
+
+    self->query_starred_files = tracker_sparql_connection_query_statement (self->db,
+                                                                           QUERY_STARRED_FILES,
+                                                                           cancellable,
+                                                                           error);
+
+    if (*error)
+    {
+        return FALSE;
+    }
+
+    return TRUE;
+}
+
+static void
+nautilus_tag_manager_init (NautilusTagManager *self)
+{
+    g_autoptr (GError) error = NULL;
+
+    self->starred_file_uris = g_hash_table_new_full (g_str_hash,
+                                                     g_str_equal,
+                                                     (GDestroyNotify) g_free,
+                                                     /* values are keys */
+                                                     NULL);
+    self->home = g_file_new_for_path (g_get_home_dir ());
+
+    if (make_dummy_instance)
+    {
+        /* Skip database initiation for nautilus_tag_manager_new_dummy(). */
+        return;
+    }
+
+    self->cancellable = g_cancellable_new ();
+    self->database_ok = setup_database (self, self->cancellable, &error);
+    if (error)
+    {
+        g_warning ("Unable to initialize tag manager: %s", error->message);
+        return;
+    }
+
+    self->notifier = tracker_sparql_connection_create_notifier (self->db);
+
+    nautilus_tag_manager_query_starred_files (self, self->cancellable);
+
+    g_signal_connect (self->notifier,
+                      "events",
+                      G_CALLBACK (on_tracker_notifier_events),
+                      self);
+}
+
+gboolean
+nautilus_tag_manager_can_star_contents (NautilusTagManager *self,
+                                        GFile              *directory)
+{
+    /* We only allow files to be starred inside the home directory for now.
+     * This avoids the starred files database growing too big.
+     * See https://gitlab.gnome.org/GNOME/nautilus/-/merge_requests/553#note_903108
+     */
+    return g_file_has_prefix (directory, self->home) || g_file_equal (directory, self->home);
+}
+
+static void
+update_moved_uris_callback (GObject      *object,
+                            GAsyncResult *result,
+                            gpointer      user_data)
+{
+    g_autoptr (GError) error = NULL;
+    g_autoptr (GPtrArray) new_uris = user_data;
+
+    tracker_sparql_connection_update_finish (TRACKER_SPARQL_CONNECTION (object),
+                                             result,
+                                             &error);
+
+    if (error != NULL && error->code != G_IO_ERROR_CANCELLED)
+    {
+        g_warning ("Error updating moved uris: %s", error->message);
+    }
+    else
+    {
+        g_autolist (NautilusFile) updated_files = NULL;
+
+        for (guint i = 0; i < new_uris->len; i++)
+        {
+            gchar *new_uri = g_ptr_array_index (new_uris, i);
+
+            updated_files = g_list_prepend (updated_files, nautilus_file_get_by_uri (new_uri));
+        }
+
+        g_signal_emit_by_name (tag_manager, "starred-changed", updated_files);
+    }
+}
+
+/**
+ * nautilus_tag_manager_update_moved_uris:
+ * @self: The tag manager singleton
+ * @src: The original location as a #GFile
+ * @dest: The new location as a #GFile
+ *
+ * Checks whether the rename/move operation (@src to @dest) has modified
+ * the URIs of any starred files, and updates the database accordingly.
+ */
+void
+nautilus_tag_manager_update_moved_uris (NautilusTagManager *self,
+                                        GFile              *src,
+                                        GFile              *dest)
+{
+    GHashTableIter starred_iter;
+    gchar *starred_uri;
+    g_autoptr (GPtrArray) old_uris = NULL;
+    g_autoptr (GPtrArray) new_uris = NULL;
+    g_autoptr (GString) query = NULL;
+
+    if (!self->database_ok)
+    {
+        g_message ("nautilus-tag-manager: No Tracker connection");
+        return;
+    }
+
+    old_uris = g_ptr_array_new ();
+    new_uris = g_ptr_array_new_with_free_func (g_free);
+
+    g_hash_table_iter_init (&starred_iter, self->starred_file_uris);
+    while (g_hash_table_iter_next (&starred_iter, (gpointer *) &starred_uri, NULL))
+    {
+        g_autoptr (GFile) starred_location = NULL;
+        g_autofree gchar *relative_path = NULL;
+
+        starred_location = g_file_new_for_uri (starred_uri);
+
+        if (g_file_equal (starred_location, src))
+        {
+            /* The moved file/folder is starred */
+            g_ptr_array_add (old_uris, starred_uri);
+            g_ptr_array_add (new_uris, g_file_get_uri (dest));
+            continue;
+        }
+
+        relative_path = g_file_get_relative_path (src, starred_location);
+        if (relative_path != NULL)
+        {
+            /* The starred file/folder is descendant of the moved/renamed directory */
+            g_autoptr (GFile) new_location = NULL;
+
+            new_location = g_file_resolve_relative_path (dest, relative_path);
+
+            g_ptr_array_add (old_uris, starred_uri);
+            g_ptr_array_add (new_uris, g_file_get_uri (new_location));
+        }
+    }
+
+    if (new_uris->len == 0)
+    {
+        /* No starred files are affected by this move/rename */
+        return;
+    }
+
+    DEBUG ("Updating moved URI for %i starred files", new_uris->len);
+
+    query = g_string_new ("DELETE DATA {");
+
+    for (guint i = 0; i < old_uris->len; i++)
+    {
+        gchar *old_uri = g_ptr_array_index (old_uris, i);
+        g_string_append_printf (query,
+                                "    <%s> a nautilus:File ; "
+                                "        nautilus:starred true . ",
+                                old_uri);
+    }
+
+    g_string_append (query, "} ; INSERT DATA {");
+
+    for (guint i = 0; i < new_uris->len; i++)
+    {
+        gchar *new_uri = g_ptr_array_index (new_uris, i);
+        g_string_append_printf (query,
+                                "    <%s> a nautilus:File ; "
+                                "        nautilus:starred true . ",
+                                new_uri);
+    }
+
+    g_string_append (query, "}");
+
+    /* Forward the new_uris list to later pass in the ::files-changed signal.
+     * There is no need to pass the old_uris because the file model is updated
+     * independently; we need only inform the view where to display stars now.
+     */
+    tracker_sparql_connection_update_async (self->db,
+                                            query->str,
+                                            self->cancellable,
+                                            update_moved_uris_callback,
+                                            g_steal_pointer (&new_uris));
+}
+
+static void
+process_tracker2_data_cb (GObject      *source_object,
+                          GAsyncResult *res,
+                          gpointer      user_data)
+{
+    NautilusTagManager *self = NAUTILUS_TAG_MANAGER (source_object);
+    g_autofree gchar *path = tracker2_migration_stamp ();
+    g_autoptr (GError) error = NULL;
+
+    tracker_sparql_connection_update_finish (self->db, res, &error);
+
+    if (!error)
+    {
+        DEBUG ("Data migration was successful. Creating stamp %s", path);
+
+        g_file_set_contents (path, "", -1, &error);
+        if (error)
+        {
+            g_warning ("Failed to create %s after migration: %s", path, error->message);
+        }
+    }
+    else
+    {
+        g_warning ("Error during data migration: %s", error->message);
+    }
+}
+
+static void
+process_tracker2_data (NautilusTagManager *self,
+                       GBytes             *key_file_data)
+{
+    g_autoptr (GKeyFile) key_file = NULL;
+    g_autoptr (GError) error = NULL;
+    gchar **groups, **group;
+    GList *selection = NULL;
+    NautilusFile *file;
+
+    key_file = g_key_file_new ();
+    g_key_file_load_from_bytes (key_file,
+                                key_file_data,
+                                G_KEY_FILE_NONE,
+                                &error);
+    g_bytes_unref (key_file_data);
+
+    if (error)
+    {
+        g_warning ("Tracker 2 migration: Failed to parse key file data: %s", error->message);
+        return;
+    }
+
+    groups = g_key_file_get_groups (key_file, NULL);
+
+    for (group = groups; *group != NULL; group++)
+    {
+        file = nautilus_file_get_by_uri (*group);
+
+        if (file)
+        {
+            DEBUG ("Tracker 2 migration: starring %s", *group);
+            selection = g_list_prepend (selection, file);
+        }
+        else
+        {
+            DEBUG ("Tracker 2 migration: couldn't get NautilusFile for %s", *group);
+        }
+    }
+
+    nautilus_tag_manager_star_files (self,
+                                     G_OBJECT (self),
+                                     selection,
+                                     process_tracker2_data_cb,
+                                     self->cancellable);
+
+    g_free (groups);
+}
+
+static void
+export_tracker2_data_cb (GObject      *source_object,
+                         GAsyncResult *res,
+                         gpointer      user_data)
+{
+    GInputStream *stream = G_INPUT_STREAM (source_object);
+    NautilusTagManager *self = NAUTILUS_TAG_MANAGER (user_data);
+    g_autoptr (GError) error = NULL;
+    GBytes *key_file_data;
+
+    key_file_data = g_input_stream_read_bytes_finish (stream, res, &error);
+
+    if (key_file_data)
+    {
+        process_tracker2_data (self, key_file_data);
+    }
+    else
+    {
+        g_warning ("Tracker2 migration: Failed to read data from pipe: %s", error->message);
+    }
+}
+
+static void
+child_watch_cb (GPid     pid,
+                gint     status,
+                gpointer user_data)
+{
+    DEBUG ("Child %" G_PID_FORMAT " exited %s", pid,
+           g_spawn_check_exit_status (status, NULL) ? "normally" : "abnormally");
+    g_spawn_close_pid (pid);
+}
+
+static void
+export_tracker2_data (NautilusTagManager *self)
+{
+    gchar *argv[] = {"tracker3", "export", "--2to3", "files-starred", "--keyfile", NULL};
+    gint stdout_fd;
+    GPid child_pid;
+    g_autoptr (GError) error = NULL;
+    gboolean success;
+    g_autoptr (GInputStream) stream = NULL;
+    GSpawnFlags flags;
+
+    flags = G_SPAWN_DO_NOT_REAP_CHILD |
+            G_SPAWN_STDERR_TO_DEV_NULL |
+            G_SPAWN_SEARCH_PATH;
+    success = g_spawn_async_with_pipes (NULL,
+                                        argv,
+                                        NULL,
+                                        flags,
+                                        NULL,
+                                        NULL,
+                                        &child_pid,
+                                        NULL,
+                                        &stdout_fd,
+                                        NULL,
+                                        &error);
+    if (!success)
+    {
+        g_warning ("Tracker 2 migration: Couldn't run `tracker3`: %s", error->message);
+        return;
+    }
+
+    g_child_watch_add (child_pid, child_watch_cb, NULL);
+
+    stream = g_unix_input_stream_new (stdout_fd, TRUE);
+    g_input_stream_read_bytes_async (stream,
+                                     TRACKER2_MAX_IMPORT_BYTES,
+                                     G_PRIORITY_LOW,
+                                     self->cancellable,
+                                     export_tracker2_data_cb,
+                                     self);
+}
+
+void
+nautilus_tag_manager_maybe_migrate_tracker2_data (NautilusTagManager *self)
+{
+    g_autofree gchar *path = tracker2_migration_stamp ();
+
+    if (g_file_test (path, G_FILE_TEST_EXISTS))
+    {
+        DEBUG ("Tracker 2 migration: already completed.");
+    }
+    else
+    {
+        DEBUG ("Tracker 2 migration: starting.");
+        export_tracker2_data (self);
+    }
+}