change permission in data volume

docker_dev_start.py

@@ -258,6 +258,17 @@
         options.append('--mount')
         data_volume_name = '{}_data'.format(project_name)
         logging.debug('Using data volume %s', data_volume_name)
+        volumes = docker_client.volumes(filters={'name': data_volume_name})
+        if volumes['Volumes']:
+            logging.debug('Volume %s already exist', data_volume_name)
+            volume = volumes['Volumes'][0]
+        else:
+            logging.debug('Creating volume %s', data_volume_name)
+            volume = docker_client.create_volume(name=data_volume_name)
+        # make sure the permission in the volume are correct
+        # TODO replace by something cleaner...
+        mount_point = volume['Mountpoint']
+        call(['sudo', 'chmod', '777', mount_point])
         options.append('source={},target=/mnt/data'.format(data_volume_name))
         arg.append('--data-dir /mnt/data')
     else: