From 47c561cfa7b3970608543f8f2cb7d08b2d1e0e4d Mon Sep 17 00:00:00 2001 From: Ron Nazarov Date: Sat, 14 Feb 2026 19:05:18 +0000 Subject: [PATCH 3/4] lib/image.py: Disable $FPT checksum check I don't actually understand what this does, but it doesn't seem to be doing anything useful. It seems to be just checking that some range of bytes is all zero, which isn't a checksum. On my OptiPlex 5050 SFF image (which passes), this range of bytes is empty, because self.data[self.HDRLEN_OFF] is 0. On my Supermicro X11SSH-F/LN4F image, self.data[self.HDRLEN_OFF] is 19, which means that self.data[self.HEADER_OFF:self.data[self.HDRLEN_OFF]] is bytearray(b'$FP'), which makes the check fail. Without this check, it can generate a working delta for the Supermicro X11SSH-F/LN4F. Change-Id: I16735676fd4ae2a4e065886aeb7a06cead721cdf Signed-off-by: Ron Nazarov --- lib/image.py | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/lib/image.py b/lib/image.py index 21db448..e303e8f 100644 --- a/lib/image.py +++ b/lib/image.py @@ -84,8 +84,8 @@ class MeImage: # Verify magic and checksum if self.data[self.MARKER_OFF:self.MARKER_OFF+4] != self.MARKER: raise ValueError("Invalid $FPT magic") - if sum(self.data[self.HEADER_OFF:self.data[self.HDRLEN_OFF]]) != 0: - raise ValueError("Invalid $FPT checksum") + # if sum(self.data[self.HEADER_OFF:self.data[self.HDRLEN_OFF]]) != 0: + # raise ValueError("Invalid $FPT checksum") # Parse entries self.entries = {} -- 2.52.0