add test for gallery previous installation

roles/gallery/tasks/main.yml

@@ -24,46 +24,58 @@
     web_group: lighttpd
     proxy_port: 3031
   block:
-    - name: add mod_scgi.conf include to lighttpd.conf
-      lineinfile:
-        path: /etc/lighttpd/lighttpd.conf
-        line: 'include "mod_scgi.conf"'
-        insertafter: "{{ '# {{{ includes' }}"
+    - name: test if gallery is already installed
+      find:
+        paths: "{{ folder }}"
+        pattern: README
+      register: check_installed
 
-    - name: copy mod_scgi.conf template
-      template:
-        src: templates/mod_scgi.conf.j2
-        dest: /etc/lighttpd/mod_scgi.conf
+    - set_fact:
+        install_gallery: "{{ check_installed.matched == 0 }}"
 
-    - name: copy uwsgi config
-      template:
-        src: "templates/gallery.ini.j2"
-        dest: "/etc/uwsgi/conf.d/gallery.ini"
-        owner: uwsgi
-        group: uwsgi
+    - name: install block
+      when: install_gallery
+      block:
+      - name: add mod_scgi.conf include to lighttpd.conf
+        lineinfile:
+          path: /etc/lighttpd/lighttpd.conf
+          line: 'include "mod_scgi.conf"'
+          insertafter: "{{ '# {{{ includes' }}"
 
-    - name: clone application repo
-      git:
-        repo: '{{ git_repo }}'
-        dest: '{{ folder }}'
+      - name: copy mod_scgi.conf template
+        template:
+          src: templates/mod_scgi.conf.j2
+          dest: /etc/lighttpd/mod_scgi.conf
 
-    - name: install application dependencies
-      pip:
-        virtualenv: '{{ folder }}/venv'
-        requirements: '{{ folder }}/requirements.txt'
+      - name: copy uwsgi config
+        template:
+          src: "templates/gallery.ini.j2"
+          dest: "/etc/uwsgi/conf.d/gallery.ini"
+          owner: uwsgi
+          group: uwsgi
 
-    - name: chown application to uwsgi user
-      command: 'chown -R uwsgi:uwsgi {{ folder }}'
+      - name: clone application repo
+        git:
+          repo: '{{ git_repo }}'
+          dest: '{{ folder }}'
 
-    - name: start and enable lighttpd service
-      service:
-        name: lighttpd
-        state: restarted
-        enabled: yes
+      - name: install application dependencies
+        pip:
+          virtualenv: '{{ folder }}/venv'
+          requirements: '{{ folder }}/requirements.txt'
 
-    - name: start and enable uwsgi service
-      service:
-        name: uwsgi
-        state: restarted
-        enabled: yes
+      - name: chown application to uwsgi user
+        command: 'chown -R uwsgi:uwsgi {{ folder }}'
+
+      - name: start and enable lighttpd service
+        service:
+          name: lighttpd
+          state: restarted
+          enabled: yes
+
+      - name: start and enable uwsgi service
+        service:
+          name: uwsgi
+          state: restarted
+          enabled: yes