post_install() {
cat << EOF

Edit '/etc/udev/rules.d/10-hddapm.rules' to configure the devices to change and
the APM level to set for each one.
Use 'udevadm info -a /dev/sdx' to obtain information about the attributes of the
drives you wish to control.

You have to manually enable the unit to have the APM level restored after
suspend/hibernate/hybrid-sleep. You can do it with: 'systemctl enable hddapm'.

If you wish to set the APM level early during boot, add hddapm to your HOOKS
line in '/etc/mkinitcpio.conf' and regenerate your initramfs.

EOF
}

post_upgrade() {
    post_install
}