several improvements

handlers/main.yml

@@ -0,0 +1,6 @@
+---
+
+- name: restart lightdm
+  service:
+    name: lightdm
+    state: restarted

tasks/main.yml

@@ -1,5 +1,15 @@
 ---
 
+- name: make sure no other display managers are installed
+  apt:
+    pkg: "{{ item }}"
+    state: absent
+  with_items:
+    - slim
+    - gdm3
+    - kdm
+    - sddm
+
 - name: install packages
   apt:
     pkg: "{{ item }}"
@@ -10,8 +20,19 @@
     - xserver-xorg-input-all
     - x11-xserver-utils
     - lightdm
+    - yad
+
+- name: lightdm configuration
+  template:
+    src: lightdm.conf.j2
+    dest: /etc/lightdm/lightdm.conf
+  notify: restart lightdm
+
+- include: mainentance.yml
 
 - name: lightdm started
   service:
     name: lightdm
     state: started
+
+- meta: flush_handlers

tasks/mainentance.yml

@@ -0,0 +1,24 @@
+---
+
+- name: mainentance user
+  user:
+    name: mainentance
+    system: yes
+    createhome: yes
+    home: /var/lib/mainentance
+
+- name: mainentance directory
+  file:
+    path: /usr/local/share/mainentance
+    state: directory
+
+- name: mainentance xsession desktop
+  template:
+    src: mainentance.desktop.j2
+    dest: /usr/local/share/mainentance/mainentance.desktop
+
+- name: mainentance xsession script
+  template:
+    src: mainentance-xsession.sh.j2
+    dest: /usr/local/share/mainentance/xsession
+    mode: u=rwx,g=rx,o=rx

templates/lightdm.conf.j2

@@ -0,0 +1,120 @@
+{{ ansible_managed | comment }}
+
+#
+# General configuration
+#
+# start-default-seat = True to always start one seat if none are defined in the configuration
+# greeter-user = User to run greeter as
+# minimum-display-number = Minimum display number to use for X servers
+# minimum-vt = First VT to run displays on
+# lock-memory = True to prevent memory from being paged to disk
+# user-authority-in-system-dir = True if session authority should be in the system location
+# guest-account-script = Script to be run to setup guest account
+# logind-check-graphical = True to on start seats that are marked as graphical by logind
+# log-directory = Directory to log information to
+# run-directory = Directory to put running state in
+# cache-directory = Directory to cache to
+# sessions-directory = Directory to find sessions
+# remote-sessions-directory = Directory to find remote sessions
+# greeters-directory = Directory to find greeters
+# backup-logs = True to move add a .old suffix to old log files when opening new ones
+#
+[LightDM]
+{% if display_manager_state == "mainentance" %}
+sessions-directory=/usr/local/share/mainentance
+{% endif %}
+
+#
+# Seat configuration
+#
+# Seat configuration is matched against the seat name glob in the section, for example:
+# [Seat:*] matches all seats and is applied first.
+# [Seat:seat0] matches the seat named "seat0".
+# [Seat:seat-thin-client*] matches all seats that have names that start with "seat-thin-client".
+#
+# type = Seat type (xlocal, xremote, unity)
+# pam-service = PAM service to use for login
+# pam-autologin-service = PAM service to use for autologin
+# pam-greeter-service = PAM service to use for greeters
+# xserver-command = X server command to run (can also contain arguments e.g. X -special-option)
+# xmir-command = Xmir server command to run (can also contain arguments e.g. Xmir -special-option)
+# xserver-config = Config file to pass to X server
+# xserver-layout = Layout to pass to X server
+# xserver-allow-tcp = True if TCP/IP connections are allowed to this X server
+# xserver-share = True if the X server is shared for both greeter and session
+# xserver-hostname = Hostname of X server (only for type=xremote)
+# xserver-display-number = Display number of X server (only for type=xremote)
+# xdmcp-manager = XDMCP manager to connect to (implies xserver-allow-tcp=true)
+# xdmcp-port = XDMCP UDP/IP port to communicate on
+# xdmcp-key = Authentication key to use for XDM-AUTHENTICATION-1 (stored in keys.conf)
+# unity-compositor-command = Unity compositor command to run (can also contain arguments e.g. unity-system-compositor -special-option)
+# unity-compositor-timeout = Number of seconds to wait for compositor to start
+# greeter-session = Session to load for greeter
+# greeter-hide-users = True to hide the user list
+# greeter-allow-guest = True if the greeter should show a guest login option
+# greeter-show-manual-login = True if the greeter should offer a manual login option
+# greeter-show-remote-login = True if the greeter should offer a remote login option
+# user-session = Session to load for users
+# allow-user-switching = True if allowed to switch users
+# allow-guest = True if guest login is allowed
+# guest-session = Session to load for guests (overrides user-session)
+# session-wrapper = Wrapper script to run session with
+# greeter-wrapper = Wrapper script to run greeter with
+# guest-wrapper = Wrapper script to run guest sessions with
+# display-setup-script = Script to run when starting a greeter session (runs as root)
+# display-stopped-script = Script to run after stopping the display server (runs as root)
+# greeter-setup-script = Script to run when starting a greeter (runs as root)
+# session-setup-script = Script to run when starting a user session (runs as root)
+# session-cleanup-script = Script to run when quitting a user session (runs as root)
+# autologin-guest = True to log in as guest by default
+# autologin-user = User to log in with by default (overrides autologin-guest)
+# autologin-user-timeout = Number of seconds to wait before loading default user
+# autologin-session = Session to load for automatic login (overrides user-session)
+# autologin-in-background = True if autologin session should not be immediately activated
+# exit-on-failure = True if the daemon should exit if this seat fails
+#
+[Seat:*]
+{% if display_manager_state == "mainentance" %}
+autologin-user=mainentance
+autologin-user-timeout=0
+user-session=mainentance
+{% endif %}
+
+#
+# XDMCP Server configuration
+#
+# enabled = True if XDMCP connections should be allowed
+# port = UDP/IP port to listen for connections on
+# listen-address = Host/address to listen for XDMCP connections (use all addresses if not present)
+# key = Authentication key to use for XDM-AUTHENTICATION-1 or blank to not use authentication (stored in keys.conf)
+# hostname = Hostname to report to XDMCP clients (defaults to system hostname if unset)
+#
+# The authentication key is a 56 bit DES key specified in hex as 0xnnnnnnnnnnnnnn.  Alternatively
+# it can be a word and the first 7 characters are used as the key.
+#
+[XDMCPServer]
+#enabled=false
+#port=177
+#listen-address=
+#key=
+#hostname=
+
+#
+# VNC Server configuration
+#
+# enabled = True if VNC connections should be allowed
+# command = Command to run Xvnc server with
+# port = TCP/IP port to listen for connections on
+# listen-address = Host/address to listen for VNC connections (use all addresses if not present)
+# width = Width of display to use
+# height = Height of display to use
+# depth = Color depth of display to use
+#
+[VNCServer]
+#enabled=false
+#command=Xvnc
+#port=5900
+#listen-address=
+#width=1024
+#height=768
+#depth=8

templates/mainentance-xsession.sh.j2

@@ -0,0 +1,4 @@
+#!/bin/bash
+xset -dpms
+xset s off
+exec yad --no-buttons --no-escape --image=emblem-system --text="Dieser Computer befindet sich derzeit im Wartungsmodus. Bitte nicht abschalten!" --image-on-top --center --borders 50

templates/mainentance.desktop.j2

@@ -0,0 +1,8 @@
+[Desktop Entry]
+Name=mainentance
+Comment=mainentance xsession
+Exec=/usr/local/share/mainentance/xsession
+Type=Application
+X-LightDM-DesktopName=mainentance
+DesktopNames=mainentance
+Keywords=wm;windowmanager;window;manager;