drone-kubernetes/update.sh

#!/bin/bash

if [ -z ${PLUGIN_NAMESPACE} ]; then
  PLUGIN_NAMESPACE="default"
fi

if [ ! -z ${PLUGIN_KUBERNETES_TOKEN} ]; then
  KUBERNETES_TOKEN=$PLUGIN_KUBERNETES_TOKEN
fi

if [ ! -z ${PLUGIN_KUBERNETES_SERVER} ]; then
  KUBERNETES_SERVER=$PLUGIN_KUBERNETES_SERVER
fi

if [ ! -z ${PLUGIN_KUBERNETES_CERT} ]; then
  KUBERNETES_CERT=${PLUGIN_KUBERNETES_CERT}
fi

kubectl config set-credentials default --token=${KUBERNETES_TOKEN}
if [ ! -z ${KUBERNETES_CERT} ]; then
  echo ${KUBERNETES_CERT} | base64 -d > ca.crt
  kubectl config set-cluster default --server=${KUBERNETES_SERVER} --certificate-authority=ca.crt
else
  echo "WARNING: Using insecure connection to cluster"
  kubectl config set-cluster default --server=${KUBERNETES_SERVER} --insecure-skip-tls-verify=true
fi

kubectl config set-context default --cluster=default --user=default
kubectl config use-context default

# kubectl version
IFS=',' read -r -a DEPLOYMENTS <<< "${PLUGIN_DEPLOYMENT}"
IFS=',' read -r -a CONTAINERS <<< "${PLUGIN_CONTAINER}"
for DEPLOY in ${DEPLOYMENTS[@]}; do
  echo Deploying to $KUBERNETES_SERVER
  for CONTAINER in ${CONTAINERS[@]}; do

    # Collect the last revision number so we can track the next one
    local LAST=$(kubectl -n ${PLUGIN_NAMESPACE} rollout history deployment/${DEPLOY} |grep -v '$^' |tail -n1 | awk '{print $1}')

    # Initiate the rolloout by modifying the image
    kubectl -n ${PLUGIN_NAMESPACE} set image deployment/${DEPLOY} \
      ${CONTAINER}=${PLUGIN_REPO}:${PLUGIN_TAG} --record

    # Wait for the rollout to complete
    kubectl -n ${PLUGIN_NAMESPACE} rollout status -r $((++LAST)) --watch
    if [ $? -ne 0  ]; then
       echo "rollout of [${PLUGIN_NAMESPACE}]:deployment/${DEPLOY}/${CONTAINER} failed"
       exit 1
    fi
  done
done