nixpkgs/nixos/tests/nagios.nix

import ./make-test-python.nix (
  { pkgs, ... }: {
    name = "nagios";
    meta = with pkgs.lib.maintainers; {
      maintainers = [ symphorien ];
    };

    machine = { lib, ... }: let
      writer = pkgs.writeShellScript "write" ''
        set -x
        echo "$@"  >> /tmp/notifications
      '';
    in
      {
        # tested service
        services.sshd.enable = true;
        # nagios
        services.nagios = {
          enable = true;
          # make state transitions faster
          extraConfig.interval_length = "5";
          objectDefs =
            (map (x: "${pkgs.nagios}/etc/objects/${x}.cfg") [ "templates" "timeperiods" "commands" ]) ++ [
              (
                pkgs.writeText "objects.cfg" ''
                  # notifications are written to /tmp/notifications
                  define command {
                  command_name notify-host-by-file
                  command_line ${writer} "$HOSTNAME is $HOSTSTATE$"
                  }
                  define command {
                  command_name notify-service-by-file
                  command_line ${writer} "$SERVICEDESC$ is $SERVICESTATE$"
                  }

                  # nagios boilerplate
                  define contact {
                  contact_name                    alice
                  alias                           alice
                  host_notifications_enabled      1
                  service_notifications_enabled   1
                  service_notification_period     24x7
                  host_notification_period        24x7
                  service_notification_options    w,u,c,r,f,s
                  host_notification_options       d,u,r,f,s
                  service_notification_commands   notify-service-by-file
                  host_notification_commands      notify-host-by-file
                  email                           foo@example.com
                  }
                  define contactgroup {
                  contactgroup_name   admins
                  alias               Admins
                  members alice
                  }
                  define hostgroup{
                  hostgroup_name  allhosts
                  alias  All hosts
                  }

                  # monitored objects
                  define host {
                  use         generic-host
                  host_name   localhost
                  alias       localhost
                  address     localhost
                  hostgroups  allhosts
                  contact_groups admins
                  # make state transitions faster.
                  max_check_attempts 2
                  check_interval 1
                  retry_interval 1
                  }
                  define service {
                  use                 generic-service
                  host_name           localhost
                  service_description ssh
                  check_command       check_ssh
                  # make state transitions faster.
                  max_check_attempts 2
                  check_interval 1
                  retry_interval 1
                  }
                ''
              )
            ];
        };
      };

    testScript = { ... }: ''
      with subtest("ensure sshd starts"):
          machine.wait_for_unit("sshd.service")


      with subtest("ensure nagios starts"):
          machine.wait_for_file("/var/log/nagios/current")


      def assert_notify(text):
          machine.wait_for_file("/tmp/notifications")
          real = machine.succeed("cat /tmp/notifications").strip()
          print(f"got {real!r}, expected {text!r}")
          assert text == real


      with subtest("ensure we get a notification when sshd is down"):
          machine.succeed("systemctl stop sshd")
          assert_notify("ssh is CRITICAL")


      with subtest("ensure tests can succeed"):
          machine.succeed("systemctl start sshd")
          machine.succeed("rm /tmp/notifications")
          assert_notify("ssh is OK")
    '';
  }
)