Prerequisites
-------------

Install Nix (as regular user, log out and back in afterwards)

$ bash <(curl -L https://nixos.org/nix/install) --daemon </dev/null

Add

extra-experimental-features = nix-command
extra-substituters = http://cache.nix.net.switch.ch
trusted-substituters = http://cache.nix.net.switch.ch
trusted-public-keys = cache.nixos.org-1:6NCHdD59X431o0gWypbMrAURkbJ16ZPMQFGspcDShjY= cache.nix.net.switch.ch:rNtCetlML0Opg0HkYQQmtY0f0K3RZDnNw1SJkmvl7Cw=

to /etc/nix/nix.conf

Restart Nix daemon

# systemctl restart nix-daemon

Usage
-----

To run the optimizer for HEAD on the rare-nix repo, execute
optimizer.sh from the profiles directory.

Commit the optimized profiles, then create a new commit on rare-nix
that includes this commit.