[gnome-settings-daemon] wacom: Implement minimal data migration

[Carlos Garnacho <carlosg src gnome org>]

commit 45c3528e281d8fb92fc0a44eb10d87035727bc65
Author: Carlos Garnacho <carlosg gnome org>
Date:   Fri Nov 18 17:24:09 2016 +0100

    wacom: Implement minimal data migration
    
    Unfortunately we can't properly lookup the schemas for styli and
    button paths (that is, without a stylus or button path to construct
    settings paths from). However, support the tablet-wide settings on
    device hotplug.

 ...ings-daemon.peripherals.wacom.gschema.xml.in.in |   12 ++--
 plugins/wacom/gsd-wacom-manager.c                  |   77 ++++++++++++++++++++
 2 files changed, 83 insertions(+), 6 deletions(-)
---
diff --git a/data/org.gnome.settings-daemon.peripherals.wacom.gschema.xml.in.in 
b/data/org.gnome.settings-daemon.peripherals.wacom.gschema.xml.in.in
index aae6f31..01c468f 100644
--- a/data/org.gnome.settings-daemon.peripherals.wacom.gschema.xml.in.in
+++ b/data/org.gnome.settings-daemon.peripherals.wacom.gschema.xml.in.in
@@ -1,7 +1,7 @@
 <schemalist>
-  <schema gettext-domain="@GETTEXT_PACKAGE@" id="org.gnome.settings-daemon.peripherals.wacom">
-    <child name="stylus" schema="org.gnome.settings-daemon.peripherals.wacom.stylus"/>
-    <child name="eraser" schema="org.gnome.settings-daemon.peripherals.wacom.eraser"/>
+  <schema id="org.gnome.settings-daemon.peripherals.wacom.deprecated">
+    <child name="stylus" schema="org.gnome.settings-daemon.peripherals.wacom.stylus.deprecated"/>
+    <child name="eraser" schema="org.gnome.settings-daemon.peripherals.wacom.eraser.deprecated"/>
 
     <!-- is-absolute applies to all tools but PAD, CURSOR is hard-coded -->
     <key name="is-absolute" type="b">
@@ -30,7 +30,7 @@
       <_description>Enable this to move the cursor when the user touches the tablet.</_description>
     </key>
   </schema>
-  <schema gettext-domain="@GETTEXT_PACKAGE@" id="org.gnome.settings-daemon.peripherals.wacom.stylus">
+  <schema id="org.gnome.settings-daemon.peripherals.wacom.stylus.deprecated">
     <key name="pressurecurve" type="ai">
       <default>[0, 0, 100, 100]</default>
       <_summary>Wacom stylus pressure curve</_summary>
@@ -47,7 +47,7 @@
       <_description>Set this to the pressure value at which a stylus click event is generated.</_description>
     </key>
   </schema>
-  <schema gettext-domain="@GETTEXT_PACKAGE@" id="org.gnome.settings-daemon.peripherals.wacom.eraser">
+  <schema id="org.gnome.settings-daemon.peripherals.wacom.eraser.deprecated">
     <key name="pressurecurve" type="ai">
       <default>[0, 0, 100, 100]</default>
       <_summary>Wacom eraser pressure curve</_summary>
@@ -64,7 +64,7 @@
       <_description>Set this to the pressure value at which an eraser click event is 
generated.</_description>
     </key>
   </schema>
-  <schema gettext-domain="@GETTEXT_PACKAGE@" id="org.gnome.settings-daemon.peripherals.wacom.tablet-button">
+  <schema id="org.gnome.settings-daemon.peripherals.wacom.tablet-button.deprecated">
     <key name="action-type" enum="org.gnome.settings-daemon.GsdWacomActionType">
       <default>'none'</default>
       <_summary>Wacom button action type</_summary>
diff --git a/plugins/wacom/gsd-wacom-manager.c b/plugins/wacom/gsd-wacom-manager.c
index 34880bc..8cbe52e 100644
--- a/plugins/wacom/gsd-wacom-manager.c
+++ b/plugins/wacom/gsd-wacom-manager.c
@@ -43,6 +43,8 @@
 #include "gsd-shell-helper.h"
 #include "gsd-device-mapper.h"
 #include "gsd-device-manager.h"
+#include "gsd-settings-migrate.h"
+
 
 #define GSD_WACOM_MANAGER_GET_PRIVATE(o) (G_TYPE_INSTANCE_GET_PRIVATE ((o), GSD_TYPE_WACOM_MANAGER, 
GsdWacomManagerPrivate))
 
@@ -81,6 +83,8 @@ struct GsdWacomManagerPrivate
 
         GsdDeviceMapper *device_mapper;
 
+        gchar *machine_id;
+
         /* DBus */
         GDBusNodeInfo   *introspection_data;
         GDBusConnection *dbus_connection;
@@ -102,6 +106,51 @@ G_DEFINE_TYPE (GsdWacomManager, gsd_wacom_manager, G_TYPE_OBJECT)
 
 static gpointer manager_object = NULL;
 
+static GVariant *
+map_tablet_mapping (GVariant *value)
+{
+        const gchar *mapping;
+
+        mapping = g_variant_get_boolean (value) ? "absolute" : "relative";
+        return g_variant_new_string (mapping);
+}
+
+static GVariant *
+map_tablet_left_handed (GVariant *value)
+{
+        const gchar *rotation = g_variant_get_string (value, NULL);
+        return g_variant_new_boolean (g_strcmp0 (rotation, "half") == 0 ||
+                                      g_strcmp0 (rotation, "ccw") == 0);
+}
+
+static void
+migrate_tablet_settings (GsdWacomManager *manager,
+                         GsdDevice       *device)
+{
+        GsdSettingsMigrateEntry tablet_settings[] = {
+                { "is-absolute", "mapping", map_tablet_mapping },
+                { "keep-aspect", "keep-aspect", NULL },
+                { "rotation", "left-handed", map_tablet_left_handed },
+        };
+        gchar *old_path, *new_path;
+        const gchar *vendor, *product;
+
+        gsd_device_get_device_ids (device, &vendor, &product);
+
+        old_path = g_strdup_printf ("/org/gnome/settings-daemon/peripherals/wacom/%s-usb:%s:%s/",
+                                    manager->priv->machine_id, vendor, product);
+        new_path = g_strdup_printf ("/org/gnome/desktop/peripherals/tablets/%s:%s/",
+                                    vendor, product);
+
+        gsd_settings_migrate_check ("org.gnome.settings-daemon.peripherals.wacom.deprecated",
+                                    old_path,
+                                    "org.gnome.desktop.peripherals.tablet",
+                                    new_path,
+                                    tablet_settings, G_N_ELEMENTS (tablet_settings));
+        g_free (old_path);
+        g_free (new_path);
+}
+
 static void
 gsd_wacom_manager_class_init (GsdWacomManagerClass *klass)
 {
@@ -236,6 +285,9 @@ device_added_cb (GsdDeviceManager *device_manager,
 
        device_type = gsd_device_get_device_type (gsd_device);
 
+        if (device_type & GSD_DEVICE_TYPE_TABLET)
+                migrate_tablet_settings (manager, gsd_device);
+
        if ((device_type & GSD_DEVICE_TYPE_TABLET) != 0 &&
             (device_type & GSD_DEVICE_TYPE_TOUCHPAD) == 0) {
                gsd_device_mapper_add_input (manager->priv->device_mapper,
@@ -352,6 +404,27 @@ register_manager (GsdWacomManager *manager)
                    manager);
 }
 
+static gchar *
+get_machine_id (void)
+{
+        gchar *no_per_machine_file, *machine_id = NULL;
+        gboolean per_machine;
+        gsize len;
+
+        no_per_machine_file = g_build_filename (g_get_user_config_dir (), "gnome-settings-daemon", 
"no-per-machine-config", NULL);
+        per_machine = !g_file_test (no_per_machine_file, G_FILE_TEST_EXISTS);
+        g_free (no_per_machine_file);
+
+        if (!per_machine ||
+            (!g_file_get_contents ("/etc/machine-id", &machine_id, &len, NULL) &&
+             !g_file_get_contents ("/var/lib/dbus/machine-id", &machine_id, &len, NULL))) {
+                return g_strdup ("00000000000000000000000000000000");
+        }
+
+        machine_id[len - 1] = '\0';
+        return machine_id;
+}
+
 gboolean
 gsd_wacom_manager_start (GsdWacomManager *manager,
                          GError         **error)
@@ -360,6 +433,8 @@ gsd_wacom_manager_start (GsdWacomManager *manager,
 
         register_manager (manager_object);
 
+        manager->priv->machine_id = get_machine_id ();
+
         manager->priv->start_idle_id = g_idle_add ((GSourceFunc) gsd_wacom_manager_idle_cb, manager);
         g_source_set_name_by_id (manager->priv->start_idle_id, "[gnome-settings-daemon] 
gsd_wacom_manager_idle_cb");
 
@@ -375,6 +450,8 @@ gsd_wacom_manager_stop (GsdWacomManager *manager)
 
         g_debug ("Stopping wacom manager");
 
+        g_clear_pointer (&manager->priv->machine_id, g_free);
+
         if (manager->priv->name_id != 0) {
                 g_bus_unown_name (manager->priv->name_id);
                 manager->priv->name_id = 0;