systemd 237 ignores --nice value in systemd-run

src/scripts/starttask.sh

@@ -42,6 +42,11 @@ else
     [[ "$BOX_ENV" == "cloudron" ]] && options="${options} -p BindsTo=box.service"
 fi
 
+# systemd 237 on Ubunut 18.04 does not apply --nice
+if [[ "${ubuntu_version}" == "18.04" ]]; then
+    (sleep 1; pid=$(systemctl show "${service_name}" -p MainPID | sed 's/MainPID=//g'); renice -n ${nice} -g ${pid} || true) &
+fi
+
 # DEBUG has to be hardcoded because it is not set in the tests. --setenv is required for ubuntu 16 (-E does not work)
 systemd-run --unit "${service_name}" --nice "${nice}" --uid=${id} --gid=${id} ${options} \
     --setenv HOME=${HOME} --setenv USER=${SUDO_USER} --setenv DEBUG=box:* --setenv BOX_ENV=${BOX_ENV} --setenv NODE_ENV=production \
@@ -59,5 +64,7 @@ if [[ "${ubuntu_version}" == "16.04" ]]; then
     systemctl stop "${service_name}" || true # because of remain-after-exit we have to deactivate the service
 fi
 
+[[ "${ubuntu_version}" == "18.04" ]] && wait # for the renice subshell we started
+
 echo "Service ${service_name} finished with exit code ${exit_code}"
 exit "${exit_code}"