add motd

modules/homelab/motd/default.nix

@@ -0,0 +1,56 @@
+{
+  config,
+  lib,
+  pkgs,
+  ...
+}: let
+  homelab = config.homelab or {};
+
+  # Build a list of { name, unit } for all non-null motd entries
+  motdServices = lib.pipe homelab [
+    lib.attrNames
+    (map (name: {
+      inherit name;
+      unit = homelab.${name}.motd or null;
+    }))
+    (lib.filter (s: s.unit != null))
+  ];
+
+  # Build script body
+  motdScript = lib.concatStringsSep "\n" (
+    [
+      "#!/usr/bin/env bash"
+      "blue='\\033[34m'"
+      "red='\\033[31m'"
+      "reset='\\033[0m'"
+      ""
+      "echo \"Hostname: $(hostname)\""
+      "echo \"Uptime: $(uptime -p)\""
+      "echo \"Load: $(awk '{print $1, $2, $3}' /proc/loadavg)\""
+      "echo"
+      "echo \"Service status:\""
+    ]
+    ++ (map (s: ''
+        status=$(systemctl is-active ${lib.escapeShellArg s.unit} 2>/dev/null)
+        if [ "$status" = "active" ]; then
+          printf "%b%-25s%b %s\\n" "$blue" "${s.name}" "$reset" "running"
+        else
+          printf "%b%-25s%b %s\\n" "$red" "${s.name}" "$reset" "FAILED ($status)"
+        fi
+      '')
+      motdServices)
+    ++ [""]
+  );
+in {
+  options.homelab.motd = {
+    enable = lib.mkEnableOption "enable custom homelab motd";
+  };
+
+  config = lib.mkIf config.homelab.motd.enable {
+    # write into /etc/profile.d so shells source it at login
+    environment.etc."profile.d/homelab-motd.sh".text = motdScript;
+
+    # make sure it is executable
+    environment.etc."profile.d/homelab-motd.sh".mode = "0755";
+  };
+}