cleanup offline nodes (jenkins / ecs)

jenkins-cleanup-nodes.sh

#!/usr/bin/env bash

throw_exception() {
  echo "Ooops!"
  echo 'Stack trace:' 1>&2
  while caller $((n++)) 1>&2; do :; done;
  exit 1
}

set -E
trap 'throw_exception' ERR

jenkins::computer_is_offline() {
  if [[ "$(echo "${1}" | jq -j '.offline')" == "true" ]]; then
    return 0
  fi
  return 1
}

jenkins::computer_delete() {
  local buf
  local crumb

  buf="$(curl \
    --retry 3 \
    --fail \
    --show-error \
    --silent \
    --user "${JENKINS_AUTH}" \
    "${JENKINS_URL}computer/${1}/delete")"

  if [[ "${buf}" =~ crumb.init\(\"Jenkins-Crumb\",\ \"([^\"]+)\"\)\; ]]; then
    crumb="${BASH_REMATCH[1]}"
  else
    return 1
  fi

  curl \
    --retry 3 \
    --fail \
    --show-error \
    --silent \
    --user "${JENKINS_AUTH}" \
    -d "Jenkins-Crumb=${crumb}" \
    -d 'Submit=yes' \
    "${JENKINS_URL}computer/${1}/doDelete" 
}

required_vars=( \
  JENKINS_URL \
  JENKINS_AUTH \
)
for required_var in "${required_vars[@]}"; do
  if [[ -z "${!required_var}" ]]; then
    echo "required var missing (${required_var})" 1>&2
    exit 2
  fi
done

computers=( $(curl \
  --retry 3 \
  --fail \
  --show-error \
  --silent \
  --user "${JENKINS_AUTH}" \
  "${JENKINS_URL}computer/api/json" | jq -r '.computer[] | @base64') )

for computer in "${computers[@]}"; do
  computer="$(_jq "${computer}")"

  computer_name="$(echo "${computer}" | jq -j '.displayName')"
  if [[ "${computer_name}" == "master" ]]; then
    continue
  fi

  if jenkins::computer_is_offline "${computer}" && [[ "$(echo "${computer}" | jq -j '.offlineCauseReason')" == "Time out for last 5 try" ]]; then
    echo "deleting offline computer: ${computer_name}"
    jenkins::computer_delete "${computer_name}"
  fi
done