WillTaylor - NixOS of 8 parts
    https://www.youtube.com/playlist?list=PL-saUBvIJzOkjAw_vOac75v-x6EzNzZq-
    p7 - Moving Nixos System Configuration Into A Flake 17:40 of 33:12
        https://www.youtube.com/watch?v=mJbQ--iBc1U
        ! 2:30 nix.package = pkgs.nixFlakes
               nix.extraOptions = ''
                  experimental-features = nix-command flakes
               '';
        ! 4:30 nix flake init
               vim flake.nix
                {
                   inputs = {
                      nixpkgs.url = "nixpkgs/nixos-unstable";
                      home-manager.url = "github:nix-community/home-manager/release-20.09";
                      home-manager.inputs.nixpkgs.follows = "nixpkgs";
                   };
                   outputs = { self, nixpkgs, home-manager, ... }:
                   let
                      system = "x86_64-linux";
                      pkgs = import nixpkgs {
                        inherit system;
                        config = { allowUnfree = true; };
                      };
                      lib = nixpkgs.lib;
                   in {
                      homeManagerConfigurations = {
                        wil = home-manager.lib.homeManagerConfiguration {
                          inherit system pkgs;
                          username = "wil";
                          homeDirectory = "/home/wil";
                          configuration = {
                            import = [
                              ./users/wil/home.nix
                            ];
                          };
                        };
                      };
                      nixosConfigurations = {
                        testbox = lib.nixosSystem {
                          inherit system;
                          modules = [
                            ...
                          ];
                        };
                      };
                   };
                }
        ! 17:00 nixos-rebuild build --flake .#<f-name>
        !       cat result/activate - massive script
        ! 20:00 nix flake update --recreate-lock-file
        ! 25:00 nix build .#homeManagerConfigurations.wil.activationPackage
        ! 26:30 # home-manager switch -f ./users/wil/home.nix
        ! 27:00 nix build .#homeManagerConfigurations.wil.activationPackage
                ./result/activate
    p6 - Intro to Flakes of 19:31
        https://www.youtube.com/watch?v=K54KKAx2wNc
        ! nix = {
            extraOptions = "experimental-features = nix-command flakes";
            package = pkgs.nixFlakes; // nix-shell -iA !!!
        ! }
        ! 4:00 put this into shell.nix
            { pkgs ? import <nixpkgs> {} }:
            pkgs.mkShell {
              name = "MyAwesomeShell";
              buildInputs = with pkgs; [
                nixFlakes
              ];

              shellHook = ''
                echo "Welcome to my awesome shell";
              '';
            }
        ! 4:40 nix flake
        !         init
        !         --help
        !         info
        !         list-inputs
        !         update [--recreate-lock-file]
        !         show
        !      nix registry
                  list
    p5 - Nix Shell of 10:36
        https://www.youtube.com/watch?v=SGekN4pDExY
        ! 3:00 nix-shell -p <package-name>
        !      nix-shell -p hello --run hello
        ! 4:30 put this into shell.nix
            { pkgs ? import <nixpkgs> {} }:
            let
               myScript = pkgs.writeScriptBin "foobar" ''
                  echo "Foobar";
               '';
            in pkgs.mkShell {
              name = "MyAwesomeShell";
              buildInputs = with pkgs; [
                figlet
                myScript
              ];

              shellHook = ''
                echo "Welcome to my awesome shell";
              '';
            }
        ! and then just type "nix-shell"
    p4 - Nix Language Overview of 30:50
        https://www.youtube.com/watch?v=eCapIx9heBw
        ! 9:00 strAttr = ''
        !         multi line string
        !      '';
        ! sets, lists, functions
        ! 11:00 functions cat get sets as params
        ! 13:00 derivation {
        !     system = "x86_64-linux";
        !     name = "foo";
        !     builder = ./builder.sh;
        !     outputs = [ "out" ];
        ! };
        ! Better ways - mkDerivation, runCommand, writeScriptBin
        ! 14:30 with
        !   environment.systemPackages = with pkgs; [
        !     git   # pkgs.git
        !   ]
        ! 15:30 import
        !   x = import ./myfile.nix;
        !   y = import ./folder;  # loads ./folder/default.nix
        ! 17:30 inherit
        !   inherit x;
        !   x = x;
        ! 18:00 if
        !   new_val = if x == 7 then "yes" else "no";
        ! 19:30 let
        !   let
        !     x = 7;
        !   in {
        !     y = x;
        !   }
        ! 21:00 nix repl (c+d to exit)
        ! 28:00 man - Trivial Builders
    p3 - NixOS Filesystem Overview of 20:00
        https://www.youtube.com/watch?v=jf0nIn2oS8A
        ! /etc is RO
        ! /run/current-system/sw/bin
        ! ~/.nix-profile/bin
        ! PATH=/run/wrappers/bin:~/.nix-profile/bin:/etc/profiles/per-user/<user>/bin:
        ! /nix/var/nix/profiles/default/bin:/run/current-system/sw/bin:~/.zsh/plugins/spaceship/prompt
        ! our compiled cfg goes to
        !   /run/current-system/sw/
        ! RO fs mount for
        !   /nix/store
        ! man nix-store
        !   gc
        !   --optimize
        ! let's check ~/.nix-profile
        !   stuff by home-manager
        ! /var/nix/profile/
        !     system -> system-<NNN>-link
        ! /nix/profiles/per-user/<username>
        !     home-manager
        !     profile -> profile-<NNN>-link
        !     system -> system-<NNN>-link
        !     activate script
        ! /etc/nix/
        !     nix.conf
        ! /etc/nixos/
        !     ???
        ! $ nix log /nix/store/<path-to-folder>
    p2 - Putting Config into Git of 31:29
        https://www.youtube.com/watch?v=Dy3KHMuDNS8
            ~/.config/nixpkgs/home.nix,
                this is the file that home-manager uses by default as it's entry point.
            with home-manager
                https://hugoreeves.com/posts/2019/nix-home/
            cd ~/.config/nixpkgs; git pull; home-manager switch
                https://github.com/HugoReeves/nix-home/
        ! 6:30 sudo nixos-rebuild switch -I nixos-config=./system/configuration.nix
        ! 8:30 home-manager switch -f ./users/will/home.nix
        ! 14:00 home-manager news
        ! 17:00 home.nix: enable program.gpg, services.gpg-agent
        !       home.packages - git-crypt, gnupg, pinentry_qt
        ! 18:20 gpg --generate-key
        ! 19:50 gpg --list-key
        !       gpg --output ../public.gpg --armor --export <my-email>
        !       gpg --output ../private.gpg --armor --export-secret-key <my-email>
        !       gpg --edit-key <my-email>
        !           trust ... quit
        ! 23:30 git config --global user.email|name ...
        !       git crypt init
        !       git crypt add-gpg-user <my-email>
        !   # ~/.git-crypt/
        !         keys/
        !       git crypt export-key ../gitgpg.key
        !       mkdir ~/.secrets # and put some files inside
        ! 27:58       
        !       ~/.gitattributes:
        !           .secrets/** filter=git-crypt diff=git-crypt
        ! 29:30 git crypt lock

    p2 - Install of 55:33
        https://www.youtube.com/watch?v=axOxLJ4BWmY
        ! 18:00 - users.user.will = ...
        ! 23:00 - at hardware-configuration.nix swapDevices = [ device = "/.swapfile"; ]
    p1 of 10:47
        https://www.youtube.com/watch?v=QKoQ1gKJY5A