this post was submitted on 01 Apr 2024
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Never mind the lines I linked to I just copied the links from search.nixos.org and those always link to the description field's line for some reason. I did link to unstable twice though this is the correct one, as you can see it goes to tukaani.org, not github.com. Correct me if I'm wrong but while you can attach additional stuff (such like pre-built binaries) to github releases the source tarballs will be generated from the repository and a tag, they will match the repository. Maybe you can do some shenanigans with rebase which should be fixed.
For any given tag, GitHub will always have an autogenerated "archive/" link, but the "release/" link is a set of maintainer-uploaded blobs. In this situation, those are the compromised ones. Any distro pulling from an "archive/" link would be unaffected, but I don't know of any doing that.
The problem with the "archive/" links is that GitHub reserves the right to change them. They're promising to give notice, but it's just not a good situation. The "release/" links are only going to change if the maintainer tries something funny, so the distro's usual mechanisms to check the hashes normally suffice.
NixOS 23.11 is indeed not affected.
cache.nixos.org keeps all sources so once hydra has ingested something it's not going away unless nixos maintainers want it to. The policy for decades was simply "keep all derivations" but in the interest of space savings it has recently been decided to do a gc run, meaning that 22 year old derivations will still available but you're going to have to build them from the cached source, the pre-built artifacts will be gone.