rollback

#!/bin/bash

usage() {
  echo "Usage: $(basename $0) -n NAMESPACE -d DEPLOYMENT" 1>&2
  exit 1
}

while getopts n:d: opt
do
  case $opt in
    n)
      namespace=$OPTARG
      ;;
    d)
      deployment=$OPTARG
      ;;
    *)
      usage
      ;;
  esac
done

if [ ! $namespace ] || [ ! $deployment ]; then
  usage
fi

k() {
  kubectl --namespace $namespace "$@"
}

k rollout history deployment/$deployment

current_revision=$(k get deployment/$deployment -o=jsonpath='{.metadata.annotations.deployment\.kubernetes\.io/revision}')
previous_revision=$(expr $current_revision - 1)
echo -e "Previous revision:\t$previous_revision"
echo -e "Current revision:\t$current_revision"

echo
k rollout history deployment/$deployment --revision=$previous_revision

read -p 'Are you okay? Hit enter: '

k rollout undo deployment/$deployment