From 4b5d1c85c01db789da08390f7c87799d5fd7cf51 Mon Sep 17 00:00:00 2001
From: Vladimir Serov <me@cab404.ru>
Date: Thu, 16 Sep 2021 01:31:47 +0300
Subject: [PATCH] update_chitu: generating update uuid based on file hash
(#4663)
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit
This makes update_chitu a pure function: same file in — same file out.
That's something I need to make Nix builds for firmware itself reproducible.
Signed-off-by: Vladimir Serov <me@cab404.ru>
---
scripts/update_chitu.py | 6 ++++--
1 file changed, 4 insertions(+), 2 deletions(-)
diff --git a/scripts/update_chitu.py b/scripts/update_chitu.py
index 2da782763..1d993b46a 100755
--- a/scripts/update_chitu.py
+++ b/scripts/update_chitu.py
@@ -6,10 +6,10 @@
# Licensed under GPL-3.0
import os
-import random
import struct
import uuid
import sys
+import hashlib
def calculate_crc(contents, seed):
accumulating_xor_value = seed;
@@ -69,7 +69,9 @@ def encode_file(input, output_file, file_length):
block_size = 0x800
key_length = 0x18
- uid_value = uuid.uuid4()
+ file_digest = hashlib.md5(input_file).digest()
+ uid_value = uuid.UUID(bytes=file_digest)
+ print("Update UUID ", uid_value)
file_key = int(uid_value.hex[0:8], 16)
xor_crc = 0xef3d4323;