[Unit]
Description=Helper to synchronize boot up for ifupdown
DefaultDependencies=no
Wants=systemd-udevd.service
After=systemd-udev-trigger.service
Before=network.target

[Service]
Type=oneshot
TimeoutSec=180
RemainAfterExit=yes
EnvironmentFile=-/etc/default/networking
ExecStart=/bin/sh -c 'if [ "$CONFIGURE_INTERFACES" != "no" ] && [ -n "$(ifquery --read-environment --list --exclude=lo)" ] && [ -x /bin/udevadm ]; then udevadm settle; fi'