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> In practice, this involves remembering which generations have known-good boots.

Another option is to use named profiles for this:

nixos-rebuild switch --profile-name whatever

The profile names show up in your boot menu.

TIL. Maybe I could get into the habit of using branches for experiments, and then including the branch name in --profile-name.

Please do. I get the impression that not many people use --profile-name, and I live in fear of them taking it away. It needs critical mass. Two of us should be enough!

TIL too. This makes 3 now.

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