postgresql: manage the change of the data directory.

postgresql/tasks/postgresql-config.yml

@@ -1,14 +1,31 @@
 ---
-- name: Create the postgresql data directory if it is not in the default place
-  file: dest={{ psql_data_dir }} owner=postgres group=postgres mode=700 recurse=yes state=directory
-  when: psql_use_alternate_data_dir
-  tags: [ 'postgresql', 'postgres', 'pg_conf' ]
+- block: 
+  - name: Check if the new postgresql data directory exists
+    stat: path={{ psql_data_dir }}
+    register: postgresql_data_dir
+
+  - name: Stop the postgresql service while reconfiguring the data directory
+    service: name=postgresql state=stopped
+    when: postgresql_data_dir.stat.isdir is not defined
+
+  - name: Create the postgresql data directory if it is not in the default place
+    file: dest={{ psql_data_dir }} owner=postgres group=postgres mode=700 recurse=yes state=directory
+
+  - name: Set the postgresql data dir if it is different from the default
+    become: True
+    become_user: postgres
+    action: configfile path={{ psql_conf_dir }}/postgresql.conf key=data_directory value="'{{ psql_data_dir }}'"
+
+  - name: Copy the postgresql data directory into the new place
+    shell: '[ "/var/lib/postgresql/{{ psql_version }}/main" != "{{ psql_data_dir }}" ] && cp -a /var/lib/postgresql/{{ psql_version }}/main/* {{ psql_data_dir }}'
+    args:
+      creates: '{{ psql_data_dir }}/main/base'
+    when: postgresql_data_dir.stat.isdir is not defined
+
+  - name: Start the postgresql service that will use the new data directory
+    service: name=postgresql state=started 
+    when: postgresql_data_dir.stat.isdir is not defined
 
-- name: Set the postgresql data dir if it is different from the default
-  become: True
-  become_user: postgres
-  action: configfile path={{ psql_conf_dir }}/postgresql.conf key=data_directory value="'{{ psql_data_dir }}'"
-  notify: Restart postgresql
   when: psql_use_alternate_data_dir
   tags: [ 'postgresql', 'postgres', 'pg_conf' ]