jenkins-disgusting-xml-parse.sh

#!/bin/bash
rdom () { local IFS=\> ; read -d \< E C ;}
base_ami=$(while rdom; do
  if [[ $E = description ]]; then
    if [[ $C =~ ^ami- ]]; then
      echo $C
    fi
  fi
done < /var/lib/jenkins/jobs/packer-base/lastSuccessful/build.xml | head -n 1)

echo "Upstream AMI is: ${base_ami}"