Use systemd helpers to honor system wide preferences on service enable/start

Also fix services being started after upgrade even if they were disabled but config existed

packages/debian/debian/postinst

@@ -27,17 +27,21 @@ systemctl daemon-reload
 systemctl reset-failed
 
 # Enable edge
-if [ -f /etc/n2n/edge.conf ]; then
-    echo "Enabling n2n edge..."
-    systemctl enable edge
-    systemctl restart edge
+if systemctl -q is-active edge; then
+    # only restart edge if it's already running
+    echo "Restarting n2n edge..."
+    deb-systemd-invoke restart edge
 fi
 
+# Restart specific services if already running
+deb-systemd-invoke enable 'edge@*.service' 'edge-ntopng@*.service'
+deb-systemd-invoke restart 'edge@*.service' 'edge-ntopng@*.service'
+
 # Enable supernode
-if [ -f /etc/n2n/supernode.conf ]; then
-    echo "Enabling n2n supernode..."
-    systemctl enable supernode
-    systemctl restart supernode
+if systemctl -q is-active supernode; then
+    # only restart supernode if it's already running
+    echo "Restarting n2n supernode..."
+    deb-systemd-invoke restart supernode
 fi
 
 exit 0

packages/debian/debian/prerm

@@ -7,12 +7,14 @@ if [ -f /.dockerenv ]; then exit 0; fi
 . /usr/share/debconf/confmodule
 
 case "$1" in
+	upgrade)
+	;;
 
 	*)
-	systemctl stop edge
-	systemctl disable edge
-	systemctl stop supernode
-	systemctl disable supernode
+	deb-systemd-invoke stop edge.service 'edge@*.service' 'edge-ntopng@*.service'
+	deb-systemd-invoke disable edge.service 'edge@*.service' 'edge-ntopng@*.service'
+	deb-systemd-invoke stop supernode.service
+	deb-systemd-invoke disable supernode.service
 	systemctl daemon-reload
 	systemctl reset-failed
 	;;

packages/rpm/n2n.spec.in

@@ -70,29 +70,19 @@ rm -fr $RPM_BUILD_ROOT
 %pre
 
 %post
-
 if [ ! -f /.dockerenv ]; then
-/bin/systemctl daemon-reload
-    if [ -f /etc/n2n/edge.conf ]; then
-	/bin/systemctl enable  edge.service
-	/bin/systemctl restart edge.service
-	fi
-
-    if [ -f /etc/n2n/supernode.conf ]; then
-	/bin/systemctl enable  supernode.service
-	/bin/systemctl restart supernode.service
-    fi
+    /bin/systemctl daemon-reload
+    # NOTE: do not enable any services during first installation
 fi
 
 %preun
 if [ ! -f /.dockerenv ]; then
-if [ -f /etc/n2n/edge.conf ]; then
-/bin/systemctl disable edge.service
-/bin/systemctl stop    edge.service
+    # possibly remove the installed services
+    %systemd_preun supernode.service edge.service 'edge-ntopng@*.service' 'edge@*.service'
 fi
 
-if [ -f /etc/n2n/supernode.conf ]; then
-/bin/systemctl disable supernode.service
-/bin/systemctl stop    supernode.service
-fi
+%postun
+if [ ! -f /.dockerenv ]; then
+    # possibly restart the running services
+    %systemd_postun_with_restart supernode.service edge.service 'edge-ntopng@*.service' 'edge@*.service'
 fi