The memcache storage requires 'dalli'

tasks/redmine.yml

@@ -153,9 +153,13 @@
     apt: pkg=libxslt1-dev state=present cache_valid_time=1800
 
   - name: Add unicorn to the redmine Gemfile
-    copy: dest={{ redmine_glob_root_dir }}/{{ redmine_inst_dir }}/Gemfile.local content='gem "unicorn"\n' owner={{ redmine_user }} group={{ redmine_group }}
+    template:
+      src: Gemfile.local.j2
+      dest: '{{ redmine_glob_root_dir }}/{{ redmine_inst_dir }}/Gemfile.local'
+      owner: '{{ redmine_user }}'
+      group: '{{ redmine_group }}'
     when: ruby_use_unicorn
-    tags: [ 'redmine', 'unicorn' ]
+    tags: [ 'redmine', 'unicorn', 'redmine_additional_gems' ]
 
   - name: Upgrade rake to fix all the gems mess
     shell: cd {{ redmine_glob_root_dir }}/{{ redmine_inst_dir }}; bundle update rake

templates/Gemfile.local.j2

@@ -0,0 +1,4 @@
+gem "unicorn"
+{% if redmine_memcached %}
+gem "dalli"
+{% endif %}