Fixing up

data/meson.build

@@ -4,8 +4,19 @@ libexecdir_conf = configuration_data()
 libexecdir_conf.set('libexecdir', prefix / libexecdir)
 
 # Portal
+tau_portal_interfaces = [
+  'org.freedesktop.impl.portal.Settings',
+]
+tau_portal_conf = configuration_data()
+tau_portal_conf.set('PORTALS', ';'.join(tau_portal_interfaces))
+
 portal_dir = datadir / 'xdg-desktop-portal' / 'portals'
-install_data('tau.portal', install_dir: portal_dir)
+configure_file(
+  input: 'tau.portal.in',
+  output: 'tau.portal',
+  configuration: tau_portal_conf,
+  install_dir: portal_dir,
+)
 
 # Service
 configure_file(

data/org.freedesktop.impl.portal.desktop.tau.service.in

@@ -1,4 +1,4 @@
 [D-BUS Service]
 Name=org.freedesktop.impl.portal.desktop.tau
 Exec=@libexecdir@/xdg-desktop-portal-tau
-SystemdService=xdg-desktop-portal-tau.service
+SystemdService=xdg-desktop-portal-tau.service

data/tau.portal.in

@@ -0,0 +1,4 @@
+[portal]
+DBusName=org.freedesktop.impl.portal.desktop.tau
+Interfaces=@PORTALS@;
+UseIn=gnome;

data/xdg-desktop-portal-tau.desktop.in.in

@@ -1,7 +1,7 @@
 [Desktop Entry]
 Type=Application
-Name=Portal
-# TRANSLATORS: Don't translate this text (this is icon name)
+Name=tauOS Portal
+# TRANSLATORS: Don't translate this text (this is the icon name)
 Icon=applications-system-symbolic
 Exec=@libexecdir@/xdg-desktop-portal-tau
-NoDisplay=true
+NoDisplay=true

data/xdg-desktop-portal-tau.service.in

@@ -1,7 +1,10 @@
 [Unit]
 Description=Portal service (tauOS implementation)
+After=graphical-session.target
+Requisite=graphical-session.target
+PartOf=graphical-session.target
 
 [Service]
 Type=dbus
 BusName=org.freedesktop.impl.portal.desktop.tau
-ExecStart=@libexecdir@/xdg-desktop-portal-tau
+ExecStart=@libexecdir@/xdg-desktop-portal-tau