Going from nix profile to configuration.nix

19 Sep 2023

$ cat ~/.nix-profile/manifest.json |
  jq --arg PLATFORM "$(nix-instantiate --eval --expr 'builtins.currentSystem' | jq --raw-output)\\." \
     --raw-output \
     '.elements[].attrPath | split(".")[-2:] | join(".") | sub($PLATFORM;"")'
jless
xxd
llvm
cmake
gnumake
clang
...

From here, add the above to systemPackages in /etc/nixos/configuration.nix. You can then remove all packages from your profile with nix profile remove '.*'.

Tip: run nixos-rebuild switch before removing all packages from your profile.