created_rclocal=0

# arg 1: the new package version
post_install() {
  vbox_create_workaround  

  # Run the VBoxLinuxAdditions Skript
  /usr/share/virtualbox/guest-additions/VBoxLinuxAdditions.run
  
  modprobe vboxsf
  
  vbox_remove_workaround
  
  # Show information
  /bin/cat <<EOF

==> To start virtualbox guest service automatically, enable and 
==> start the service through systemctl:
==> sudo systemctl enable vboxservice.service 
==> sudo systemctl start vboxservice.service
EOF
  
}

# arg 1:  the new package version
# arg 2:  the old package version
post_upgrade() {
  post_install "$1"
}

# arg 1: the old package version
post_remove() {
  # ${1%-*} : version without pkgrel (4.2.2)
  
  vbox_create_workaround
  
  /opt/VBoxGuestAdditions-${1%-*}/uninstall.sh
  
  vbox_remove_workaround
  groupdel vboxsf >/dev/null 2>&1 || true
}

# Create rc.local file as workaround
vbox_create_workaround() {
  # workaround: create /etc/rc.local, if not exists
  if [ ! -e /etc/rc.local ]; then
  touch /etc/rc.local
  created_rclocal=1
  fi
}

# Remove rc.local, if we created this file
vbox_remove_workaround() {
  # If created_rclocal, remove /etc/rc.local
  if [ ${created_rclocal} -eq 1 ]; then
    rm -f /etc/rc.local
  fi
  # Remove rc.vbox* files
  rm -f /etc/rc.d/rc.vbox*
}