Dockerise

pixie.sh

#! /usr/bin/env bash

PROGRAM_HOME=$(realpath ${0} 2>/dev/null || cd "$(dirname "${0}")" ; pwd -P)/..
RUNTIME_TAG=pixie-runtime:1.0

function run_script {
  CUT_LINE=$(cat ${0} | grep -n '#! dockerise ' | tail -1 | awk -F ':' '{print $1}')
  tail +${CUT_LINE} ${0} | tail -n +2 | \
    docker run --rm -i \
      -v /var/run/docker.sock:/var/run/docker.sock \
      -v ${TMP_DIR}:/tmp \
      ${RUNTIME_TAG} \
      ruby - ${@}
}

function build_runtime {
  cat <<EOT | docker build - -t ${RUNTIME_TAG}
FROM ruby:2.6
RUN gem install docopt
EOT
}

if [ $(docker images | tail -n +2 | awk '{print $1":"$2}' | grep ${RUNTIME_TAG}) ]; then
  run_script ${@}
  echo ${?}
else
  build_runtime
fi

exit 0

#! dockerise pixie-runtime:1.0
#! /usr/bin/env ruby
puts "hello"
p ARGV
exit