add custom nixos install iso

modules/default.nix

@@ -10,5 +10,6 @@
     ./minecraft-server
     ./monitoring
     ./nginx-port-forward
+    ./nixfiles
   ];
 }

modules/nixfiles/default.nix

@@ -0,0 +1,95 @@
+{ config, pkgs, lib, ...}:
+
+with lib;
+
+let
+  nixfiles-generate-config = pkgs.writeScriptBin "nixfiles-generate-config" ''
+    #!${pkgs.bash}/bin/bash
+    set -euo pipefail
+
+    hostname=$(hostname --short)
+    root=""
+    ngcroot=""
+
+    while [[ $# -gt 0 ]]; do
+      case $1 in
+        --root)
+          root=$2
+          ngcroot="--root ''${root}"
+          shift
+          shift
+          ;;
+        --hostname)
+          hostname=$2
+          shift
+          shift
+          ;;
+        *)
+          echo "unknown option: $1"
+          exit 1
+          ;;
+      esac
+    done
+
+    mkdir -p ''${root}/etc/nixos
+
+    if [[ ! -d "''${root}/etc/nixos/.git" ]]; then
+      ${pkgs.git}/bin/git clone https://git.clerie.de/clerie/nixfiles.git ''${root}/etc/nixos
+      ${pkgs.git}/bin/git -C ''${root}/etc/nixos remote set-url origin gitea@git.clerie.de:clerie/nixfiles.git 
+    fi
+
+    mkdir -p ''${root}/etc/nixos/hosts/''${hostname}
+
+    nixos-generate-config ''${ngcroot} --dir ''${root}/etc/nixos/hosts/''${hostname}
+
+    # make sure host is added to flake.nix
+    if ! grep -q "''${hostname} = generateNixosSystem \"''${hostname}\";" ''${root}/etc/nixos/flake.nix; then
+      sed -i "s/\(\s*\)_iso = generateNixosSystem \"_iso\";/\1''${hostname} = generateNixosSystem \"''${hostname}\";\n&/g" ''${root}/etc/nixos/flake.nix
+    fi
+
+    sed -i "s/\%HOSTNAME\%/''${hostname}/g" ''${root}/etc/nixos/hosts/''${hostname}/configuration.nix
+  '';
+
+  nixfiles-install = pkgs.writeScriptBin "nixfiles-install" ''
+    #!${pkgs.bash}/bin/bash
+    nixos-install --flake /etc/nixos $@
+  '';
+
+  nixfiles-rebuild = pkgs.writeScriptBin "nixfiles-rebuild" ''
+    #!${pkgs.bash}/bin/bash
+    nixos-rebuild --flake /etc/nixos $@
+  '';
+
+in {
+  options.clerie.nixfiles.enable = mkEnableOption "clerie nixfiles tools";
+  config = mkIf config.clerie.nixfiles.enable {
+    system.nixos-generate-config.configuration = ''
+      { config, pkgs, lib, ... }:
+
+      {
+        imports =
+          [
+            ./hardware-configuration.nix
+          ];
+
+      $bootLoaderConfig
+
+        networking.hostName = "%HOSTNAME%";
+
+        clerie.monitoring = {
+          # enable = true;
+          id = "%MONITORING_ID%";
+          pubkey = "%MONITORING_PUBKEY%";
+        };
+
+        system.stateVersion = "${config.system.nixos.release}";
+      }
+    '';
+
+    environment.systemPackages = [
+      nixfiles-generate-config
+      nixfiles-install
+      nixfiles-rebuild
+    ];
+  };
+}