nixos/modules/installer/common.nix

{ pkgs, lib, vars, ... }:

{
  imports = [
    ./host-keys.nix
  ];

  networking.useDHCP = lib.mkDefault true;

  # Recommended over the true default (bypasses ZFS's own import safeguards)
  # per the option's own docs. This installer environment has no ZFS pools
  # of its own to import, so this is a no-op here — just silences the
  # eval-time warning, matching modules/common/configuration.nix.
  boot.zfs.forceImportRoot = false;

  time.timeZone = vars.timeZone;

  # Without this, the installer only ever sees cache.nixos.org, which
  # doesn't carry sops-install-secrets (it's built straight from the
  # sops-nix flake's own Go source, not part of nixpkgs) — every install
  # would otherwise compile it from scratch, which is what ran an 8GB LXC
  # container's disk out of space. Push a built copy to nix-cache once
  # (from a machine with real disk headroom) and every future install,
  # of any type, fetches instead of rebuilding.
  nix.settings = {
    substituters = [
      "http://nix-cache"
      "https://cache.nixos.org/"
    ];
    trusted-public-keys = [
      "cache.local-1:usoWYanY3Kpq2+kDIS2nhWoLZiRxanmdysdzqCFBHW4="
      "cache.nixos.org-1:6NCHdD59X431o0gWypbMrAURkbJ16ZPMQFGspcDShjY="
    ];
  };

  environment = {
    systemPackages = with pkgs; [
      git
      curl
      jq
      parted
      e2fsprogs
      btrfs-progs
      util-linux
      disko
    ];

    # Auto-install script, kept as a real, version-controlled shell file at
    # scripts/installer/auto-install.sh rather than an inline Nix string.
    # It sources scripts/env.sh itself (for LAN_DOMAIN, same as every other
    # script in this repo) rather than relying on Nix-level templating, so
    # it behaves identically whether it's run straight from a git checkout
    # or from here -- baking scripts/env.sh in alongside it at a matching
    # relative path (installer/auto-install.sh -> ../env.sh) is what makes
    # that resolve correctly in both places.
    etc = {
      "nixos-installer/env.sh".source = ../../scripts/env.sh;

      "nixos-installer/installer/auto-install.sh" = {
        source = ../../scripts/installer/auto-install.sh;
        mode = "0755";
      };
    };
  };

  programs.git.enable = true;

  # Run the installer on first login. Previously this copied an /etc file
  # into the nixos user's ~/.bash_profile via an activation script that
  # got dropped in a refactor (and only ever worked for that one user
  # anyway) — loginShellInit is NixOS's native hook for this, applies to
  # any user's login shell (root included), and needs no home-directory
  # file-copying/chown.
  programs.bash.loginShellInit = ''
    if [ -n "$PS1" ] && [ ! -e "$HOME/.auto_install_ran" ]; then
      sudo /etc/nixos-installer/installer/auto-install.sh
      touch "$HOME/.auto_install_ran"
    fi
  '';

  services.openssh.enable = true;

  services.openssh.settings = {
    PermitRootLogin = "yes";
    PasswordAuthentication = true;
  };

  # nixpkgs' own installer profile (profiles/installation-device.nix, pulled
  # in via installation-cd-minimal.nix) sets initialHashedPassword = "" for
  # both users — its own passwordless-login convention for install media.
  # That's a second, non-null password option alongside our hashedPassword
  # below, which NixOS warns about as ambiguous precedence. Force it null
  # rather than adopting passwordless login: this image now also boots over
  # LAN PXE with PasswordAuthentication enabled, so passwordless root SSH
  # would be reachable by anyone on the LAN, not just local console.
  users.users.root = {
    hashedPassword =
      "$6$Kwv9KAyvcurAViQF$H4.u3feqGE7lVoNgkFXhE3n2Pmo//9JYDTCz8ifrVHBxPjwa1xMby7tEZ8Bpt5MXs9Rkx6/YbZWxs5CpH0s/70";
    initialHashedPassword = lib.mkForce null;
  };

  users.users.${vars.primaryUser} = {
    isNormalUser = true;

    extraGroups = [
      "wheel"
    ];

    shell = pkgs.bashInteractive;

    hashedPassword =
      "$6$Kwv9KAyvcurAViQF$H4.u3feqGE7lVoNgkFXhE3n2Pmo//9JYDTCz8ifrVHBxPjwa1xMby7tEZ8Bpt5MXs9Rkx6/YbZWxs5CpH0s/70";
    initialHashedPassword = lib.mkForce null;

    openssh.authorizedKeys.keys = [
      vars.adminSshKey
    ];
  };

  system.stateVersion = "26.05";
}