Note that the file we have in lists/ is not what we downloaded as we have downloaded a highly compressed version of the content (e.g. xz), but store it either uncompressed (for which we have a checksum) or lightly compressed (e.g. lz4 for which we have no checksum and can not as different versions of a compressor could produce different files). So such a check is not exactly free as we need to potentially uncompress the content we want to check – we can't even do a size check in the general case "for free". It might be worth it paying the price in "update", but there are a bunch of people who believe we shouldn't, reporting bugs to the effect that a no-change update should finish instantly.
That said, files of size 0 could be made always invalid: We don't download such files nowadays (as an empty file compressed has a [small] size), so files in lists/ should have at least some content and if they don't something is absolutely fishy. -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1809174 Title: apt doesn't detect file corruption in /var/lib/apt/lists To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/apt/+bug/1809174/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
