build/docker/check_unmodified.sh

#!/bin/bash
#
# Licensed to the Apache Software Foundation (ASF) under one
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# distributed with this work for additional information
# regarding copyright ownership. The ASF licenses this file
# to you under the Apache License, Version 2.0 (the
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#
#   http://www.apache.org/licenses/LICENSE-2.0
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# Download prebuilt docker image and compare Dockerfile hash values

set -ex

SCRIPT_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
DISTRO=$1
SRC_IMG=thrift/thrift-build:$DISTRO

function try_pull {
  docker pull $SRC_IMG
  cd ${SCRIPT_DIR}/$DISTRO
  docker run $SRC_IMG bash -c 'cd .. && sha512sum Dockerfile' > .Dockerfile.sha512
  sha512sum -c .Dockerfile.sha512
}

if try_pull; then
  echo Dockerfile seems identical. No need to rebuild from scratch.
  docker tag thrift/thrift-build:$DISTRO thrift-build:$DISTRO
else
  echo Either Dockerfile has changed or pull failure. Need to build brand new one.
  exit 1
fi