When creating ext2/ext3/ext4 filesystems, mke2fs generates a random
hash_seed for htree directory indexing. This causes non-reproducible
images even when SOURCE_DATE_EPOCH is set and the same filesystem UUID
is used.
Set the hash_seed explicitly to match the filesystem UUID, ensuring
that repeated builds with the same seed produce bit-for-bit identical
images.
Also add a test case in TEST-58-REPART to verify ext4 reproducibility
by creating the same partition twice and comparing the results.
See https://vdwaa.nl/mkosi-reproducible-arch-images.html
I used claude ai to help me with this change.
ZauberNerd
7bf0d0c46e