install_msg() {
    cat << __EOF__
===> IMPORTANT NOTICES:

In order to complete the installation, and enable Xen,
at the very least you must:
1. If using GRUB2, edit your GRUB2 config files as specified at
    https://wiki.parabola.nu/index.php/Xen#Bootloader_Configuration

    Support for the grub-mkconfig command was added, and will auto-discover
     the deployed xen hypervisor and linux kernel
2. If booting via efi, copy the example /etc/xen/efi-xen.cfg to /boot/xen.cfg
   and edit the contents to match the settings you need.
3. Issue the following commands to allow you to create and start VMs:

    systemctl enable xen-qemu-dom0-disk-backend.service
    systemctl enable xen-init-dom0.service
    systemctl enable xenconsoled.service

   Other optional services are:
    systemctl enable xen-watchdog.service

4. If you want some domains to automatically start up/shutdown, run the following:
    systemctl enable xendomains.service

For more information refer to the Wiki:
    https://wiki.parabola.nu/index.php/Xen

__EOF__

}

upgrade_msg() {
    cat << __EOF__
Xen 4.7
Release notes
http://wiki.xen.org/wiki/Xen_Project_4.7_Release_Notes
Feature list
http://wiki.xen.org/wiki/Xen_Project_4.7_Feature_List
__EOF__

}

post_install() {
    install_msg
    upgrade_msg
}

post_upgrade() {
    upgrade_msg
}

pre_remove() {
   systemctl stop xendomains.service
   systemctl stop xen-watchdog.service
   systemctl stop xenconsoled.service
   systemctl stop xen-init-dom0.service
   systemctl stop xen-qemu-dom0-disk-backend.service

   systemctl disable xendomains.service
   systemctl disable xen-watchdog.service
   systemctl disable xenconsoled.service
   systemctl disable xen-init-dom0.service
   systemctl disable xen-qemu-dom0-disk-backend.service
}

post_remove() {
    cat << __EOF__
===> IMPORTANT NOTICE:

In order to finish removing Xen, you will need to modify
your bootloader configuration files to load your Linux-libre
kernel instead of Xen kernel.
__EOF__
}