syslog-ng: stop service when uninstalling/updating

This avoids the possibility of the service getting reloaded and
a previously running instance trying to re-dynamically link to
more modern plugins.

Signed-off-by: Philip Prindeville <philipp@redfish-solutions.com>

admin/syslog-ng/Makefile

@@ -2,7 +2,7 @@ include  $(TOPDIR)/rules.mk
 
 PKG_NAME:=syslog-ng
 PKG_VERSION:=3.17.2
-PKG_RELEASE:=1
+PKG_RELEASE:=2
 
 PKG_MAINTAINER:=W. Michael Petullo <mike@flyn.org>
 
@@ -74,4 +74,19 @@ define Package/syslog-ng/install
 	$(call libtool_remove_files,$(1))
 endef
 
+define Package/syslog-ng/prerm
+	#!/bin/sh
+	# check if we are on real system
+	if [ -z "$${IPKG_INSTROOT}" ]; then
+		# wish we had pidof unconditionally
+		pid=$(ps | grep syslog | grep -v grep | awk '{ print $$1; }')
+		[ -n "$$pid" ] && /etc/init.d/syslog-ng stop
+		[ "$${PKG_UPGRADE}" != "1" ] && {
+			echo "Removing rc.d symlink for syslog-ng"
+			/etc/init.d/syslog-ng disable
+		}
+	fi
+	exit 0
+endef
+
 $(eval $(call BuildPackage,syslog-ng))