DEB: disable service on purge instead of removal, restart on upgrade

install/debian/postinst.in

@@ -38,7 +38,10 @@ fi
 
 systemctl daemon-reload || true
 
-# Only enable/start on initial install
+# Add/update state file, required for purge action in postrm
+deb-systemd-helper update-state $NAME.service || true
+
+# Only enable on initial install
 if [ -z "$2" ]; then
   systemctl -q enable $NAME || true
   systemctl start $NAME || true
@@ -49,7 +52,7 @@ else
     systemctl -q enable $NAME || true
   fi
 
-  systemctl try-restart $NAME || true
+  systemctl restart $NAME || true
 fi
 
 echo

install/debian/postrm

@@ -8,6 +8,9 @@ case "$1" in
     ;;
 
   purge)
+    # Disable service
+    deb-systemd-helper purge $NAME.service || true
+
     # Remove all files
     rm -rf /etc/$NAME /var/lib/$NAME /var/log/$NAME
 

install/debian/prerm

@@ -5,6 +5,5 @@ NAME=fah-client
 case "$1" in
   remove)
     systemctl stop $NAME || true
-    systemctl -q disable $NAME || true
     ;;
 esac