add pid file to systemd unit and move services to data folder

data/s6/dependencies

@@ -0,0 +1 @@
+dbus

data/s6/meson.build

@@ -0,0 +1,17 @@
+s6_config_data = configuration_data()
+s6_config_data.set('LIBEXECDIR', join_paths(get_option('prefix'), get_option('libexecdir'), meson.project_name()))
+
+s6_config_data_file = configure_file(
+    input: 'run.in',
+    output: 'run',
+    configuration: s6_config_data
+)
+
+s6 = find_program ('s6-init', required: false)
+
+if s6.found()
+    install_data(
+        [s6_config_data_file, 'type', 'dependencies'],
+        install_dir: join_paths(get_option('sysconfdir'), 's6', 'sv', 'tufmanager')
+    )
+endif

data/s6/run.in

@@ -0,0 +1,3 @@
+#!/usr/bin/execlineb -P
+fdmove -c 2 1
+exec @LIBEXECDIR@/tuf-server -f

data/s6/type

@@ -0,0 +1 @@
+longrun