bouncerw

#!/usr/bin/env bash

# If your TF env has multiple simultaneous bouncer invocations, you're in a race condition
# for downloading the binary, so that's why we handle a lockfile
lockfile='.bouncer_download_lock'
fd='200'
lock_timeout='30'

lock() {
  echo "Attempting to lock ${lockfile}"
  eval "exec ${fd}>${lockfile}"

  if flock -w ${lock_timeout} ${fd}; then
    echo "Lock acquired"
    return 0
  else
    echo "Timed-out waiting for lock"
    return 1
  fi
}

unlock() {
  echo "Releasing lock on ${lockfile}"

  if flock -u ${fd}; then
    echo "Lock released"
    return 0
  else
    echo "Error releasing log"
    return 1
  fi
}

download() {
  if [ "${BOUNCER_VERSION}" == "" ]; then
    echo "BOUNCER_VERSION is not set. Looking for the latest bouncer release..."
    BOUNCER_VERSION=$(curl -s https://api.github.com/repos/palantir/bouncer/releases/latest | jq -r '.' | grep "tag_name" | sed 's/.\(.*\)/\1/' | sed 's/\(.*\)./\1/' | tr -d '"' | sed "s/.*v//")
    export BOUNCER_VERSION
  fi
  # Strip a leading 'v' if someone adds one, or one winds-up there somehow
  BOUNCER_VERSION="${BOUNCER_VERSION//v}"
  export BOUNCER_VERSION
  echo "Installing bouncer version ${BOUNCER_VERSION}"
  wget -q -O bouncer.tgz "https://github.com/palantir/bouncer/releases/download/v${BOUNCER_VERSION}/bouncer-${BOUNCER_VERSION}-linux-amd64.tgz"
  tar -xzf bouncer.tgz
  chmod 755 ./bouncer
}

lock || exit 1
if [ ! -f ./bouncer ]; then
  download || exit 1
else
  echo "Bouncer already installed, using local copy"
fi
unlock || exit 1

./bouncer "$@"