first-setup: Automatically expand root partition

- Show expansion option in the UI only if the partition expansion failed during
  first setup.

Signed-off-by: Joseph Nuthalapati <njoseph@thoughtworks.com>
Reviewed-by: James Valleroy <jvalleroy@mailbox.org>

plinth/modules/storage/__init__.py

@@ -27,7 +27,7 @@ from django.utils.translation import ugettext_lazy as _
 from plinth import actions
 from plinth.menu import main_menu
 
-version = 1
+version = 2
 
 name = _('Storage')
 
@@ -39,6 +39,8 @@ logger = logging.getLogger(__name__)
 
 manual_page = 'Storage'
 
+is_essential = True
+
 
 def init():
     """Intialize the module."""
@@ -164,3 +166,11 @@ def format_bytes(size):
 
     size /= 1024**4
     return _('{disk_size:.1f} TiB').format(disk_size=size)
+
+
+def setup(helper, old_version=None):
+    """Expand root parition on first setup."""
+    disks = get_disks()
+    root_device = get_root_device(disks)
+    if is_expandable(root_device):
+        expand_partition(root_device)

plinth/modules/storage/templates/storage.html

@@ -83,8 +83,8 @@
     </tbody>
   </table>
 
-  <h3>{% trans "Partition Expansion" %}</h3>
   {% if expandable_root_size %}
+    <h3>{% trans "Partition Expansion" %}</h3>
     <p>
       {% blocktrans trimmed %}
         There is {{ expandable_root_size }} of unallocated space
@@ -98,18 +98,6 @@
          role="button">
         {% trans "Expand Root Partition" %}</a>
     </p>
-  {% else %}
-    <p>
-      {% blocktrans trimmed %}
-        There is no unallocated space after your root partition.
-        There is no need to expand it.
-      {% endblocktrans %}
-    </p>
-    <p>
-      <a class="btn btn-primary btn-md disabled"
-         href="{% url 'storage:expand' %}" role="button">
-        {% trans "Expand Root Partition" %}</a>
-    </p>
   {% endif %}
 
 {% endblock %}