buildgrid/utils.py: New `get_hash_type` function.

Returns the hash type.

buildgrid/utils.py

@@ -30,6 +30,14 @@ def get_hostname():
     return socket.gethostname()
 
 
+def get_hash_type():
+    """Returns the hash type."""
+    hash_name = HASH().name
+    if hash_name == "sha256":
+        return remote_execution_pb2.SHA256
+    return remote_execution_pb2.UNKNOWN
+
+
 def create_digest(bytes_to_digest):
     """Computes the :obj:`Digest` of a piece of data.