nixos-utm/flake.nix

{
  description = "Description for the project";

  inputs = {
    nixpkgs.url = "github:NixOS/nixpkgs/nixos-unstable";
    devenv.url = "github:cachix/devenv";
  };

  outputs = inputs @ {flake-parts, ...}:
    flake-parts.lib.mkFlake {inherit inputs;} {
      imports = [
        inputs.devenv.flakeModule
      ];
      systems = ["x86_64-linux" "aarch64-darwin"];
      perSystem = {
        config,
        self',
        inputs',
        pkgs,
        system,
        ...
      }: {
        # Per-system attributes can be defined here. The self' and inputs'
        # module parameters provide easy access to attributes of the same
        # system.
        # Equivalent to  inputs'.nixpkgs.legacyPackages.hello;
        packages.nixosImg = pkgs.fetchurl {
          url = "https://hydra.nixos.org/build/237110262/download/1/nixos-minimal-23.11pre531102.fdd898f8f79e-aarch64-linux.iso";
          sha256 = "sha256-PF6EfDXHJDQHHHN+fXUKBcRIRszvpQrrWmIyltFHn5c=";
        };
        packages.utm = pkgs.utm.overrideAttrs (oldAttrs: rec {
          version = "4.4.2";
          src = pkgs.fetchurl {
            url = "https://github.com/utmapp/UTM/releases/download/v${version}/UTM.dmg";
            #hash = "sha256-aDIjf4TqhSIgYaJulI5FgXxlNiZ1qcNY+Typ7+S5Hc8=";
            hash = "sha256-QKZNIqJpY5ipl6R5/UHjfh6I5NkyFn5xZLy/CL5453g=";
          };
        });
        packages.nixosCmd = pkgs.writeShellApplication {
          name = "nixosCmd";
          runtimeInputs = [self'.packages.utm];
          text = ''
            TT=$(utmctl attach "$NIXOS_NAME" | sed -n -e 's/PTTY: //p')
            DAT=/tmp/ttyDump.dat.''$''$
            trap 'rm "$DAT"' EXIT

            exec 3<"$TT"                         #REDIRECT SERIAL OUTPUT TO FD 3
            cat <&3 > "$DAT" &          #REDIRECT SERIAL OUTPUT TO FILE
            PID=$!                                #SAVE PID TO KILL CAT
            echo -e "$@" > "$TT";
            sleep 0.3s                          #WAIT FOR RESPONSE
            kill $PID                             #KILL CAT PROCESS
            wait $PID 2>/dev/null || true                 #SUPRESS "Terminated" output
            exec 3<&-
            cat $DAT
          '';
        };
        packages.nixosIP = pkgs.writeShellApplication {
          name = "nixosIP";
          runtimeInputs = [self'.packages.nixosCmd pkgs.gnused];
          text = ''
            nixosCmd ip a | sed -ne 's/.*inet \([0-9]*\.[0-9]*\.[0-9]*\.[0-9]*\).*scope global.*/\1/p'
          '';
        };
        packages.nixosSetRootPW = pkgs.writeShellApplication {
          name = "nixosSetRootPW";
          runtimeInputs = [self'.packages.nixosCmd];
          text = ''nixosCmd "echo -e '$NIXOS_PW\n$NIXOS_PW' | sudo passwd" '';
        };
        packages.sshNixos = pkgs.writeShellApplication {
          name = "sshNixos";
          runtimeInputs = [self'.packages.nixosIP pkgs.openssh];
          text = ''
            # shellcheck disable=SC2029
            ssh "root@$(nixosIP)" "$@"
          '';
        };
        devenv.shells.default = {
          env.NIXOS_NAME = "AAA";
          env.NIXOS_PW = "foo";
          packages = builtins.attrValues {
            inherit (self'.packages) utm sshNixos nixosIP nixosCmd nixosSetRootPW;
            inherit (pkgs) coreutils expect;
          };
        };
      };
      flake = {
        # The usual flake attributes can be defined here, including system-
        # agnostic ones like nixosModule and system-enumerating ones, although
        # those are more easily expressed in perSystem.
      };
    };
}