DCD-828: Initial attempt at tar-based server-to-DC transform

roles/restore_backups/tasks/home_restore.yml

@@ -18,6 +18,24 @@
         src: "{{ atl_backup_home_dest }}"
         remote_src: yes
         dest: "{{ atl_product_home_shared }}"
+      when: atl_backup_home_is_server is not defined or not atl_backup_home_is_server|bool
+
+    - name: Restore a Confluence server home to share-home layout
+      unarchive:
+        src: "{{ atl_backup_home_dest }}"
+        remote_src: yes
+        dest: "{{ atl_product_home_shared }}"
+        # Use tar transform to convert the Confluence Server
+        # (unclustered) layout to shared-home version. What occurs is:
+        #  * --transform runs first, moving attachments into the shared home.
+        #  * --strip-components removes the top-level directory
+        # NOTE: Also see the `confluence_config` role, which uses
+        # symlinks to support server and clustered layouts
+        # concurrently.
+        extra_opts:
+          - "--transform=s,^attachments,shared-home/attachments,"
+          - "--strip-components=1"
+      when: atl_backup_home_is_server is defined and atl_backup_home_is_server|bool
 
     - name: Set shared home owner and group to application user
       file: