mkosi: increase buffer size when hashing files

We need to do some buffering here, because the files we are hashing can be gigabytes
in size, but Python loops are slow, so it's better to use a larger buffer.

diff --git a/mkosi b/mkosi
index 35db5bc602ed8a8c9b9ff9ef0d82ec6659561ce3..e3f325655ebb5ffdc1b0a8758bc8f9713339689a 100755 (executable)
--- a/mkosi
+++ b/mkosi
@@ -1074,7 +1074,7 @@ def copy_nspawn_settings(args):
     return f
 
 def hash_file(of, sf, fname):
-    bs = 65536
+    bs = 16*1024**2
     h = hashlib.sha256()
 
     sf.seek(0)