add new motd

modules/rust-motd.nix

@@ -0,0 +1,86 @@
+{ pkgs, lib, config, ... }:
+{
+  environment = {
+    systemPackages = with pkgs; [
+      rust-motd
+      toilet
+    ];
+
+    loginShellInit = let
+      motd = "${pkgs.rust-motd}/bin/rust-motd /etc/${config.environment.etc.rustMotdConfig.target}";
+    in ''
+      # Assure stdout is a terminal, so headless programs won't be broken
+      if [ "x''${SSH_TTY}" != "x" ]; then
+        ${motd}
+      fi
+    '';
+
+    etc.rustMotdConfig = {
+      target = "rust-motd-config.toml";
+      source = let
+
+        cfg = {
+          global = {
+            progress_full_character = "=";
+            progress_empty_character = "=";
+            progress_prefix = "[";
+            progress_suffix = "]";
+            time_format = "%Y-%m-%d %H:%M:%S";
+          };
+
+          banner = {
+            color = "red";
+            command = "hostname | ${pkgs.toilet}/bin/toilet -f mono9";
+          };
+          
+          service_status = {
+            Accounts = "accounts-daemon";
+            Cron = "cron";
+            Docker = "docker";
+            Matrix = "matrix-synapse";
+            sshd = "sshd";
+          };
+          
+          uptime = {
+            prefix = "Uptime: ";
+          };
+          
+          # Not relevant for server
+          # user_service_status = {
+          #   Gpg-agent = "gpg-agent";
+          # };
+          
+          filesystems = let
+            inherit (lib.attrsets) attrNames listToAttrs nameValuePair;
+            inherit (lib.lists) imap1;
+            inherit (config) fileSystems;
+
+            imap1Attrs' = f: set:
+              listToAttrs (imap1 (i: attr: f i attr set.${attr}) (attrNames set));
+
+            getName = i: v: if (v.label != null) then v.label else "<? ${toString i}>";
+          in
+            imap1Attrs' (i: n: v: nameValuePair (getName i v) n) fileSystems;
+          
+          memory = {
+            swap_pos = "beside"; # or "below" or "none"
+          };
+
+          last_login = let
+            inherit (lib.lists) imap1;
+            inherit (lib.attrsets) filterAttrs nameValuePair attrValues listToAttrs;
+            inherit (config.users) users;
+            
+            normalUsers = filterAttrs (n: v: v.isNormalUser || n == "root") users;
+            userNPVs = imap1 (index: user: nameValuePair user.name index) (attrValues normalUsers);
+          in listToAttrs userNPVs;
+
+          last_run = {};
+        };
+      
+        toml = pkgs.formats.toml {};
+
+      in toml.generate "rust-motd.toml" cfg;
+    };
+  };
+}