Update Extension Pack for VirtualBox automatically (grep -qE "$(date +\%Y-\%m-\%d).*virtualbox" /var/log/zypp/history)

get_vbox-extpack.sh

#!/bin/bash

cd "$HOME/VirtualBox VMs/" || exit 1

# https://www.virtualbox.org/manual/ch08.html

VERSION=$(VBoxManage -v|cut -d '_' -f1|cut -d "r" -f1)
CURRENT=$(VBoxManage list extpacks|grep "Version:"|awk '{print $2}')
# MUST BE RUN AFTER 'get_vboxguestadditions.sh' !!!
[ "${VERSION}" == "${CURRENT}" ] && exit 1

EXTPACK=Oracle_VM_VirtualBox_Extension_Pack-${VERSION}.vbox-extpack
URL=http://download.virtualbox.org/virtualbox/${VERSION}/${EXTPACK}

wget "$URL" --no-clobber --quiet && {
  sudo VBoxManage extpack install --replace "$EXTPACK" \
    --accept-license=xyz &>/dev/null || \
      VBoxManage list extpacks | mail -s "[Info] Fehler beim Update von $EXTPACK" thomas; }
#VBoxManage list extpacks
#rm Oracle_VM_VirtualBox_Extension_Pack-$VERSION.vbox-extpack

--accept-license needs a value that you will get by this:

VBoxManage will display the SHA-256 value when performing a manual installation. The hash can of course be calculated by looking inside the extension pack and using sha256sum or similar on the license file.