replace sleep lock script with a systemd unit

Existing users should delete the old script.

    # rm /usr/lib/systemd/system-sleep/lock.sh

roles/screensaver/files/screenlock.service

@@ -0,0 +1,13 @@
+[Unit]
+Description=Screen lock
+Before=sleep.target
+
+[Service]
+User=%I
+Type=forking
+Environment=DISPLAY=:0
+ExecStart=/usr/local/bin/lock
+ExecStartPost=/usr/bin/sleep 1
+
+[Install]
+WantedBy=sleep.target

roles/screensaver/files/sleeplock.sh

@@ -1,6 +0,0 @@
-#!/bin/bash
-# {{ ansible_managed }}
-
-if [ "$1" = "post" ]; then
-    /usr/local/bin/lock
-fi

roles/screensaver/meta/main.yml

@@ -1,4 +1,3 @@
 ---
 dependencies:
-  - { role: base }
-  - { role: x }
+  - { role: systemd }

roles/screensaver/tasks/main.yml

@@ -10,5 +10,10 @@
 - name: Push lock script
   copy: src=lock.sh dest=/usr/local/bin/lock mode=0755
 
-- name: Push sleep lock script
-  copy: src=sleeplock.sh dest=/usr/lib/systemd/system-sleep/lock.sh mode=0755
+- name: Push screen lock service file
+  copy: src=screenlock.service dest=/etc/systemd/system/screenlock@.service
+  notify:
+    - reload systemd config
+
+- name: Enable screen lock service
+  service: name="screenlock@{{ user.name }}.service" enabled=yes