modules: Use namespaces

That might make it easier in the future to merge different server
configs together (and thusly facilitate code-reuse.).

1 files changed, 96 insertions, 0 deletions

diff --git a/modules/vhack/ru/rust-motd/module.nix b/modules/vhack/ru/rust-motd/module.nix
new file mode 100644
index 0000000..bf23843
--- /dev/null
+++ b/modules/vhack/ru/rust-motd/module.nix
@@ -0,0 +1,96 @@
+{
+  config,
+  lib,
+  pkgs,
+  ...
+}: let
+  cfg = config.vhack.rust-motd;
+
+  # List all users that can login
+  pred = n: v: (
+    false # <- just here for neat formatting
+    || v.initialHashedPassword != null
+    || v.initialPassword != null
+    || v.hashedPassword != null
+    || v.hashedPasswordFile != null
+    || v.password != null
+    || v.passwordFile != null
+    || v.openssh.authorizedKeys.keys != []
+    || v.openssh.authorizedKeys.keyFiles != []
+  );
+  userList = builtins.mapAttrs (n: v: 2) (lib.filterAttrs pred config.users.users);
+
+  bannerFile =
+    pkgs.runCommandLocal "banner-file" {
+      nativeBuildInputs = [pkgs.figlet];
+    } ''
+      echo "${config.system.name}" | figlet -f slant > "$out"
+    '';
+in {
+  options.vhack.rust-motd = {
+    enable = lib.mkEnableOption "rust-motd";
+  };
+
+  config = lib.mkIf cfg.enable {
+    systemd.services.rust-motd = {
+      path = with pkgs; [
+        bash
+        fail2ban # Needed for rust-motd fail2ban integration
+      ];
+    };
+
+    programs.rust-motd = {
+      enable = true;
+      enableMotdInSSHD = true;
+      refreshInterval = "*:0/5"; # 0/5 means: hour 0 AND all hour wich match (0 + 5 * x) (is the same as: 0, 5, 10, 15, 20)
+
+      # An example is here: https://raw.githubusercontent.com/rust-motd/rust-motd/refs/heads/main/example_config.toml
+      settings = {
+        global = {
+          progress_full_character = "=";
+          progress_empty_character = "-";
+          progress_prefix = "[";
+          progress_suffix = "]";
+          time_format = "%Y-%m-%d %H:%M:%S";
+        };
+
+        banner = {
+          color = "red";
+          # Avoid some runtime dependencies.
+          command = "cat ${bannerFile}";
+        };
+
+        cg_stats = {
+          state_file = "/var/lib/rust-motd/cg_stats_state";
+          threshold = 0.02; # When to start generating output for a cgroup
+        };
+        load_avg = {
+          format = "Load (1, 5, 15 min.): {one:.02}, {five:.02}, {fifteen:.02}";
+        };
+
+        uptime = {
+          prefix = "Uptime:";
+        };
+
+        filesystems = {
+          root = "/";
+          persistent = "/srv";
+          store = "/nix";
+          boot = "/boot";
+        };
+
+        memory = {
+          swap_pos = "beside"; # or "below" or "none"
+        };
+
+        fail_2_ban = {
+          jails = ["sshd"]; #, "anotherjail"]
+        };
+
+        last_login = userList;
+
+        last_run = {};
+      };
+    };
+  };
+}