Bugfix: hash.hashFileContents() crash for huge files (> free memory size)

beat/backend/python/hash.py

@@ -112,4 +112,8 @@ def hashFileContents(path):
   """Hashes the file contents using :py:func:`hashlib.sha256`."""
 
   with open(path, 'rb') as f:
-    return hashlib.sha256(f.read()).hexdigest()
+    sha256 = hashlib.sha256()
+    for chunk in iter(lambda: f.read(sha256.block_size * 1000), b''):
+      sha256.update(chunk)
+
+    return sha256.hexdigest()