post_install() {
  if [ ! -f /etc/ssl/certs/java/cacerts ]; then
    for jvm in /usr/lib/jvm/java-1.6.0-openjdk /opt/java/jre; do
      if [ -x $jvm/bin/keytool ]; then
        break
      fi
    done
    if [ -x $jvm/bin/keytool ]; then
      /usr/sbin/init-jks-keystore
    fi
  fi
}

post_upgrade() {
  post_install
}

post_remove() {
  rm -rf /etc/ssl/certs/java
}