make lightdm guest work

packer/ansible/roles/windowmanager/tasks/lightdm.yml

@@ -30,13 +30,47 @@
       value: bottom
     - option: clock-format
       value: "%H:%M:%S"
+
+- name: genereate guest-session directory
+  file:
+    path: /etc/guest-session
+    state: directory
+
+- name: link guest-session configs
+  file:
+    src: /etc/skel
+    dest: /etc/guest-session/skel
+    state: link
+
+- name: get guest-account scripts
+  get_url:
+    url: "{{ item.url }}"
+    dest: "{{ item.dest }}"
+    mode: "0755"
+  with_items:
+    - url: https://raw.githubusercontent.com/CanonicalLtd/lightdm/master/debian/guest-session-setup.sh
+      dest: /etc/guest-session/setup.sh
+    - url: https://raw.githubusercontent.com/CanonicalLtd/lightdm/master/debian/guest-account.sh
+      dest: /usr/local/sbin/guest-account
+
+- name: modify guest-account script
+  lineinfile:
+    path: /usr/local/sbin/guest-account
+    regexp: '^dist_gs=.*$'
+    line: 'dist_gs=/etc/guest-session'
+
+- name: configure lightdm
+  ini_file:
+    path: /etc/lightdm/lightdm.conf
+    section: "Seat:*"
+    option: "{{ item.option }}"
+    value: "{{ item.value }}"
+  with_items:
     - option: allow-guest
       value: "true"
     - option: greeter-allow-guest
       value: "true"
-
-- name: get guest-account script
-  get_url:
-    url: https://raw.githubusercontent.com/CanonicalLtd/lightdm/master/debian/guest-account.sh
-    dest: /usr/local/sbin/guest-account
-    mode: 755
+    - option: user-session
+      value: MATE
+    - option: guest-session
+      value: MATE