add md5sum for download

disk.py

@@ -8,7 +8,7 @@ from zipfile import ZipFile, is_zipfile
 from zlib import decompressobj, MAX_WBITS
 from bz2 import BZ2Decompressor
 from time import sleep
-
+from hashlib import md5
 import re
 
 import requests
@@ -52,6 +52,10 @@ class Disk(object):
         self.actual_size = actual_size
         self.base_name = base_name
 
+    @property
+    def checksum(self):
+        return md5(self.get_path()).hexdigest()
+
     @classmethod
     def deserialize(cls, desc):
         """Create cls object from JSON."""

storagedriver.py

@@ -37,7 +37,8 @@ class download(AbortableTask):
         disk = Disk.deserialize(disk_desc)
         disk.download(self, url, parent_id)
         return {'size': disk.size,
-                'type': disk.format}
+                'type': disk.format,
+                'checksum': disk.checksum, }
 
 
 @celery.task()