helpers

# Ruby builder helper functions
#

function print_usage_and_exit() {
  echo
  echo "This is the Ruby/Rails self-contained builder image."
  echo "You can use this to produce application images:"
  echo
  echo "  $ docker run -v \$(pwd):/tmp/src openshift/centos-ruby-builder"
  echo
  echo "You can also archive artifacts from the current application image:"
  echo
  echo "  $ docker run --entrypoint='${HOME}/bin/save-artifacts' ruby-app > archive.tgz"
  echo
  echo "And restore the artifacts on the next build:"
  echo
  echo "  $ docker run -v \$(pwd):/tmp/src openshift/centos-ruby-builder < archive.tgz"
  echo
  echo "Other options:"
  echo
  echo "  -s <URL>  Point builder to remote directory with assemble scripts"
  echo "  -h        Print this usage"
  echo "  -d        Drop to the shell instead of build."
  echo
  exit 0
}

# Functions to support downloading/replacing the base image scripts.
# Users could override them by:
#
# 1) Adding them into GIT_SOURCE/.sti/ folder
# 1) Using '-s URL' on the builder command line

function download_script() {
  local url="$1"
  local script_name="$2"
  if ! curl --silent -L "${url}/${script_name}" > ${HOME}/bin/${script_name}; then
    echo "Warning: Unable to download '${url}/${script_name}' ($?)"
  fi
}

function copy_script() {
  local $script_name="$1"
  [ ! -f "/tmp/src/.sti/${script_name}"] && return
  cp -f "/tmp/src/.sti/${script_name}" "${HOME}/bin/${script_name}" && \
    chmod +x "${HOME}/bin/${script_name}"
}

function download_assemble_scripts() {
  # FIXME: Rename 'prepare' to 'assemble' at some point.
  download_script "$1" "prepare"
  download_script "$1" "save-artifacts"
  download_script "$1" "restore-artifacts"
  download_script "$1" "run"
}

function copy_assemble_scripts() {
  copy_script 'prepare'
  copy_script 'save-artifacts'
  copy_script 'restore-artifacts'
  copy_script 'run'
}