Properly handle systemd start/stop during Debian package install, closes #30

scripts/postinst.sh

@@ -0,0 +1,19 @@
+#!/bin/sh
+set -e
+
+# Restart systemd service if it was already running. Note that "deb-systemd-invoke try-restart" will
+# only act if the service is already running. If it's not running, it's a no-op.
+#
+# TODO: This is only tested on Debian.
+#
+if [ "$1" = "configure" ] && [ -d /run/systemd/system ]; then
+  systemctl --system daemon-reload >/dev/null || true
+  if systemctl is-active -q ntfy.service; then
+    echo "Restarting ntfy.service ..."
+    if [ -x /usr/bin/deb-systemd-invoke ]; then
+      deb-systemd-invoke try-restart ntfy.service >/dev/null || true
+    else
+      systemctl restart ntfy.service >/dev/null || true
+    fi
+  fi
+fi