Add MOTD that summarizes the system current status

configuration.nix

@@ -101,6 +101,9 @@
   # Increase inotify limits
   boot.kernel.sysctl = { "fs.inotify.max_user_watches" = 204800; };
 
+  # MOTD message
+  programs.fish.interactiveShellInit = "${./scripts/motd.sh}";
+
   # Import other configuration modules
   imports = [
     ./modules/hardware-configuration.nix

scripts/motd.sh

@@ -0,0 +1,45 @@
+#!/run/current-system/sw/bin/bash
+
+# Kernel information
+LINUX=$(uname -rs | cut -d " " -f2)
+
+# System uptime
+uptime=$(cut -f1 -d. </proc/uptime)
+upDays=$((uptime / 60 / 60 / 24))
+upHours=$((uptime / 60 / 60 % 24))
+upMins=$((uptime / 60 % 60))
+upSecs=$((uptime % 60))
+
+# System load
+MEMORY=$(free -m | awk 'NR==2{printf "%s/%sMB (%.2f%%)\n", $3,$2,$3*100/$2 }')
+CPU_LOAD=$(uptime | cut -d: -f5)
+
+echo "============================================================
+ - Kernel..............: $LINUX
+ - System load.........:$CPU_LOAD
+ - Memory used.........: $MEMORY
+ - System uptime.......: $upDays days $upHours hours $upMins minutes $upSecs seconds
+============================================================"
+services=(
+	"syncthing.service"
+	"radicale.service"
+	"miniflux.service"
+	"phpfpm-wallabag.service"
+	"gitea.service"
+	"matrix-synapse.service"
+	"nginx.service"
+)
+
+for var in "${services[@]}"; do
+	if [[ -z $var ]]; then
+		printf "\n"
+	else
+		if systemctl -q is-active "${var}"; then
+			printf "%-40s [\e[32mOK\e[39m]\n" "$var"
+		else
+			printf "%-40s [\e[31mFAIL\e[39m]\n" "$var"
+		fi
+	fi
+done
+
+echo "============================================================"