How to remove a NixOS system profile?

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1

nixos-rebuild boot or nixos-rebuild switch will update /nix/var/nix/profiles/system by default.

But with the -p foobar or --profile-name foobar option, they can be made to update /nix/var/nix/profiles/system-profiles/foobar instead and to create that profile if it doesn’t already exist.

If I’ve done that and want to get rid of one such additional system profile again, what should I do?

Should I simply manually delete it as follows?

sudo rm /nix/var/nix/profiles/system-profiles/foobar{,-*-link}

If so, are additional steps needed or is that all?

Or is there a nixos-* or nix-* command to do system profile removal?

2

yes

If so, are additional steps needed or is that all?

no. Make sure your current system isn’t linked to it.

3

Are there plans to add a subcommand to clear these to nix-collect-garbage or derivative? We have --delete-old; a --deleted-named [name/pattern] would be handy.