Ooops.

slapos/libnetworkcache.py

@@ -225,7 +225,7 @@ class NetworkcacheClient(object):
                             (self.shacache_host, result.status, data))
 
     if key is not None:
-      kw.edit(sha512=data) # always update sha512sum
+      kw['sha512'] = data # always update sha512sum
       sha_entry = json.dumps(kw)
       try:
         signature = self._getSignatureString(sha_entry)