Update docs and screenshots

scripts/control-system.sh

@@ -0,0 +1,45 @@
+#!/usr/bin/env bash
+
+set -euo pipefail
+
+SYSTEMD_RUN="${SYSTEMD_RUN:-/usr/bin/systemd-run}"
+SYSTEMCTL_BIN="${SYSTEMCTL_BIN:-/usr/bin/systemctl}"
+UNIT_SUFFIX="$(date +%s)-$$"
+
+if [[ "${EUID}" -ne 0 ]]; then
+  echo "control-system.sh skal koeres som root." >&2
+  exit 1
+fi
+
+if [[ ! -x "$SYSTEMD_RUN" ]]; then
+  echo "systemd-run blev ikke fundet." >&2
+  exit 1
+fi
+
+if [[ ! -x "$SYSTEMCTL_BIN" ]]; then
+  echo "systemctl blev ikke fundet." >&2
+  exit 1
+fi
+
+case "${1:-}" in
+  restart-service)
+    exec "$SYSTEMD_RUN" \
+      --quiet \
+      --collect \
+      --unit "tuxdmx-restart-service-$UNIT_SUFFIX" \
+      --description "Genstart TuxDMX service" \
+      /bin/sh -lc "sleep 2 && '$SYSTEMCTL_BIN' restart tuxdmx.service"
+    ;;
+  reboot-host)
+    exec "$SYSTEMD_RUN" \
+      --quiet \
+      --collect \
+      --unit "tuxdmx-reboot-host-$UNIT_SUFFIX" \
+      --description "Genstart TuxDMX host" \
+      /bin/sh -lc "sleep 2 && '$SYSTEMCTL_BIN' reboot"
+    ;;
+  *)
+    echo "Brug: $0 {restart-service|reboot-host}" >&2
+    exit 2
+    ;;
+esac