core/systemd/systemd.install

#!/bin/sh

sd_booted() {
  [ -e sys/fs/cgroup/systemd ]
}
   
post_install() {
  udevadm hwdb --update 

  if sd_booted; then
    systemctl --system daemon-reexec
  fi

}

post_upgrade() {
  udevadm hwdb --update

  journalctl --update-catalog
  
  if [ "$(pacman -Q systemd | cut -d " " -f2 | cut -d "-" -f1)" = "196" ] ; then
    echo -e '\e[31;46m WARNING'
    echo -e '\e[31;46m Systemd 197 has moved to persistent network naming, for most users this will have' 
    echo -e '\e[31;46m no effect.  To check what the new name for your network device will be, run:'
    echo -e '\e[31;46m hwinfo --network, and look for: Device File: xxxxx, were xxxx is your device.'
    echo -e '\e[31;46m This will be used in /usr/lib/udev/rules.d/80-net-name-slot.rules '
    echo -e '\e[31;46m If you use dhcpcd instead of networkmanager to connect, re-enable the service before rebooting'
    echo -e '\e[31;46m Configuration files like conky.conf will need the new naming scheme too'
    echo -e '\e[31;46m http://www.freedesktop.org/wiki/Software/systemd/PredictableNetworkInterfaceNames \e[0m'
  fi
  
  if sd_booted; then
    systemctl --system daemon-reexec
    systemctl restart systemd-logind.service
  fi

}