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sudo nix-channel --add https://nixos.org/channels/nixos-20.09 nixos-20.09
sudo nix-channel --update
let
oldcrap = import <nixos-20.09>
in {
environment.systemPackages = with pkgs; [
oldcrap.foo
];
}
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{ config, pkgs, lib, ... }:
let
oldcrap = import <nixos-20.09> { };
in
{
options.oldcrap.enable = lib.mkEnableOption "My old crap";
config = lib.mkIf config.oldcrap.enable {
environment.systemPackages = [ oldcrap.foo0 oldcrap.foo1 ];
};
}
oldcrap.enable = true;
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LW
{ config, pkgs, lib, ... }:
let
unstableTarball =
fetchTarball
https://github.com/NixOS/nixpkgs/archive/nixos-unstable.tar.gz;
oldpacklink = <nixos-20.09>;
in
{
nixpkgs.config = {
packageOverrides = pkgs: {
unstable = import unstableTarball {
config = config.nixpkgs.config;
};
oldpack = import oldpacklink {
config = config.nixpkgs.config;
};
};
};