I upgraded NixOS. X stopped working. I eventually traced that to what config.boot.vesa does in a current nixos. Happily I could still browse and search for help on my phone. Reminded of the bad old days. PCs pile features upon features and there's no force toward simplification.
Still, I kept in git a reference to a configuration that worked, including which precise checkout of nixpkgs it worked with, so I knew I could to reproduce the previous working configuration if needed.
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Just *knowing* that I could restore a previous installation from spec if needed was a huge stress relief, though not as good as having a trivial way to go back to already installed previous version. The ergonomics of version pinning in NixOS could be improved.
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I guess you did `sudo nix-collect-garbage -d`? Do you know `nix-collect-garbage --delete-older-than 30d`?
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