nixos_config/nixos/hosts/alisceon-core/configuration.nix

{ lib, pkgs, modulesPath, ... }:
let
  forgejoDomain = "git.alisceon.com";
  forgejoRunnerTokenFile = "/var/lib/forgejo/runner_token";

  fetchOciAuthorizedKeys = pkgs.writeShellApplication {
    name = "fetch-oci-authorized-keys";
    runtimeInputs = [
      pkgs.coreutils
      pkgs.curl
    ];
    text = ''
      install -d -m 0700 -o alisceon -g users /home/alisceon/.ssh

      if [ -s /home/alisceon/.ssh/authorized_keys ]; then
        echo "OCI authorized_keys already present for alisceon"
        exit 0
      fi

      curl --fail --silent --show-error --location \
        --header "Authorization: Bearer Oracle" \
        --output /home/alisceon/.ssh/authorized_keys \
        http://169.254.169.254/opc/v2/instance/metadata/ssh_authorized_keys

      chown alisceon:users /home/alisceon/.ssh/authorized_keys
      chmod 0600 /home/alisceon/.ssh/authorized_keys
    '';
  };

  generateForgejoRunnerToken = pkgs.writeShellApplication {
    name = "generate-forgejo-runner-token";
    runtimeInputs = [
      pkgs.coreutils
      pkgs.util-linux
    ];
    text = ''
      token_file=${lib.escapeShellArg forgejoRunnerTokenFile}

      if [ -s "$token_file" ]; then
        chmod 0600 "$token_file"
        chown root:root "$token_file"
        exit 0
      fi

      install -d -m 0750 -o forgejo -g forgejo /var/lib/forgejo
      token="$(runuser -u forgejo -- env \
        FORGEJO_WORK_DIR=/var/lib/forgejo \
        FORGEJO_CUSTOM=/var/lib/forgejo/custom \
        ${lib.getExe pkgs.forgejo-lts} actions generate-runner-token)"

      umask 0077
      printf 'TOKEN=%s\n' "$token" > "$token_file"
      chown root:root "$token_file"
      chmod 0600 "$token_file"
    '';
  };
in
{
  imports = [
    "${modulesPath}/virtualisation/oci-image.nix"
  ];

  nixpkgs.hostPlatform = lib.mkDefault "aarch64-linux";

  networking = {
    hostName = "alisceon-core";
    networkmanager.enable = lib.mkForce false;
    firewall.allowedTCPPorts = [
      22
      80
      443
    ];
  };

  boot = {
    initrd.availableKernelModules = [
      "virtio_pci"
      "virtio_blk"
      "virtio_scsi"
      "virtio_net"
      "xhci_pci"
    ];
    loader.systemd-boot.configurationLimit = lib.mkForce 3;
  };

  nix = {
    settings = {
      min-free = lib.mkForce (512 * 1024 * 1024);
      max-free = lib.mkForce (2 * 1024 * 1024 * 1024);
    };
    gc = {
      dates = lib.mkForce "daily";
      options = lib.mkForce "--delete-older-than 3d";
    };
  };

  virtualisation = {
    docker.enable = lib.mkForce false;
    podman = {
      enable = true;
      dockerSocket.enable = true;
      autoPrune = {
        enable = true;
        dates = "daily";
        flags = [ "--all" ];
      };
    };
  };

  users.users.alisceon.extraGroups = [ "systemd-journal" ];

  security = {
    acme = {
      acceptTerms = true;
      defaults.email = "acme@alisceon.com";
    };
    sudo-rs.wheelNeedsPassword = false;
  };

  services.openssh.settings = {
    PasswordAuthentication = false;
    PermitRootLogin = lib.mkForce "prohibit-password";
  };

  services.forgejo = {
    enable = true;
    package = pkgs.forgejo-lts;
    database.type = "sqlite3";
    lfs.enable = true;
    settings = {
      server = {
        DOMAIN = forgejoDomain;
        ROOT_URL = "https://${forgejoDomain}/";
        HTTP_ADDR = "127.0.0.1";
        HTTP_PORT = 3000;
        SSH_DOMAIN = forgejoDomain;
        SSH_PORT = 22;
        DISABLE_SSH = false;
      };
      session.COOKIE_SECURE = true;
      service = {
        DISABLE_REGISTRATION = true;
        REQUIRE_SIGNIN_VIEW = false;
      };
      actions.ENABLED = true;
      repository = {
        DEFAULT_PRIVATE = "private";
        DISABLE_HTTP_GIT = false;
      };
      "cron.archive_cleanup" = {
        ENABLED = true;
        RUN_AT_START = true;
        SCHEDULE = "@every 24h";
        OLDER_THAN = "72h";
      };
      log.LEVEL = "Warn";
    };
  };

  services.gitea-actions-runner = {
    package = pkgs.forgejo-runner;
    instances.alisceon-core-podman = {
      enable = true;
      name = "alisceon-core-podman";
      url = "https://${forgejoDomain}";
      tokenFile = forgejoRunnerTokenFile;
      labels = [
        "ubuntu-latest:docker://node:22-bookworm"
        "debian-latest:docker://node:22-bookworm"
      ];
      settings = {
        container = {
          network = "host";
          privileged = false;
          valid_volumes = [ ];
        };
        cache.enabled = false;
      };
    };
  };

  services.nginx = {
    enable = true;
    recommendedGzipSettings = true;
    recommendedOptimisation = true;
    recommendedProxySettings = true;
    recommendedTlsSettings = true;
    virtualHosts.${forgejoDomain} = {
      forceSSL = true;
      enableACME = true;
      locations."/" = {
        proxyPass = "http://127.0.0.1:3000";
        recommendedProxySettings = true;
      };
    };
  };

  services.cloud-init = {
    enable = true;
    network.enable = true;
    settings = {
      datasource_list = [ "Oracle" "ConfigDrive" "NoCloud" ];
      users = [ "default" ];
      system_info.default_user = {
        name = "alisceon";
        gecos = "Alisceon";
        groups = [ "wheel" "systemd-journal" ];
        shell = "/run/current-system/sw/bin/xonsh";
        lock_passwd = true;
      };
    };
  };

  systemd.services.fetch-oci-authorized-keys = {
    description = "Fetch OCI metadata authorized_keys for alisceon";
    wantedBy = [ "sshd.service" ];
    before = [ "sshd.service" ];
    after = [ "network-online.target" ];
    wants = [ "network-online.target" ];
    serviceConfig = {
      Type = "oneshot";
      RemainAfterExit = true;
      StandardError = "journal+console";
      StandardOutput = "journal+console";
    };
    script = lib.getExe fetchOciAuthorizedKeys;
  };

  systemd.services.fetch-ssh-keys.enable = false;

  systemd.services.forgejo-runner-token = {
    description = "Generate Forgejo runner registration token";
    wantedBy = [ "multi-user.target" ];
    after = [ "forgejo.service" ];
    requires = [ "forgejo.service" ];
    serviceConfig = {
      Type = "oneshot";
      RemainAfterExit = true;
      StandardError = "journal+console";
      StandardOutput = "journal+console";
    };
    script = lib.getExe generateForgejoRunnerToken;
  };

  systemd.services."gitea-runner-alisceon\\x2dcore\\x2dpodman" = {
    after = [ "forgejo-runner-token.service" ];
    requires = [ "forgejo-runner-token.service" ];
  };

  environment.systemPackages = with pkgs; [
    curl
    forgejo-lts
    git
    htop
    jq
    vim
    wget
  ];

  system.stateVersion = lib.mkForce "25.11";
}