Wrap the original container-builder-local so we can use cloudbuild.yaml files with COMMIT_SHA.

container-builder-local-fix

#!/usr/bin/env bash
# Wrapper around container-builder-local to deal with annoying missing features.
# Missing global subtituions by tool:
#  COMMIT_SHA not being available.

command -v container-builder-local >/dev/null 2>&1 || { echo -e >&2 "I require container-builder-local but it's not installed. Aborting.\\nhttps://github.com/GoogleCloudPlatform/container-builder-local#install-using-gcloud"; exit 1; }

command -v envsubst >/dev/null 2>&1 || { echo >&2 "I require envsubst but it's not installed. Aborting."; exit 1; }

die() {
    printf '%s\n' "$1" >&2
    exit 1
}

wrapper_usage() {
    printf 'Extra wrapper options for container-builder-local:\n'
    # shellcheck disable=SC2016
    printf ' --commit-sha=<string> [default: git rev-parse --short HEAD in $PWD (%s)]\n\n' "$PWD"
}

args=( )
config_value=
commit_sha=

while :; do
   case $1 in
       -h|-help|--help)
           wrapper_usage
           args+=( "$1" )
           ;;
       --commit-sha)
           if [ "$2" ]; then
               commit_sha=$2
               shift
           else
               die 'ERROR: "--commit-sha" requires a non-empty option argument.'
           fi
           ;;
       --commit-sha=?*)
           commit_sha=${1#*=}
           ;;
       --commit-sha=)
           die 'ERROR: "--commit-sha" requires a non-empty option argument.'
           ;;


       -config|--config)
           if [ "$2" ]; then
               config_value=$2
               shift
           fi
           ;;
       -config=?*|--config=?*)
           config_value=${1#*=}
           ;;
       -config=|--config=)
           die 'ERROR: "--config" requires a non-empty option argument.'
           ;;


       --)              # End of all options.
           shift
           break
           ;;
       *)               # Default case: No more options, so break out of the loop.
           break
   esac

   shift
done

if [ -n "$config_value" ]; then
  test -n "$commit_sha" || commit_sha="$(git rev-parse --short HEAD)"

  echo container-builder-local "${args[@]}" --config "<(COMMIT_SHA=${commit_sha} envsubst '\${COMMIT_SHA}' < \"$config_value\")" "$@"
  container-builder-local "${args[@]}" --config <(COMMIT_SHA=${commit_sha} envsubst "\${COMMIT_SHA}" < "$config_value") "$@"
else
  container-builder-local "${args[@]}" "$@"
fi