dokku/plugins/builder-pack/docker-args-process-deploy

#!/usr/bin/env bash
set -eo pipefail
[[ $DOKKU_TRACE ]] && set -x

trigger-builder-pack-docker-args-process-deploy() {
  declare desc="builder-pack core-post-deploy plugin trigger"
  declare trigger="docker-args-process-deploy"
  declare APP="$1" IMAGE_SOURCE_TYPE="$2" IMAGE_TAG="$3" PROC_TYPE="$4"
  local STDIN=$(cat)
  local inject_launcher output

  if [[ "$IMAGE_SOURCE_TYPE" != "pack" ]]; then
    return
  fi

  inject_launcher=true
  if [[ -n "$IMAGE_TAG" ]] && [[ -n "$PROC_TYPE" ]] && [[ -z "$(plugn trigger procfile-get-command "$APP" "$PROC_TYPE" "5000" 2>/dev/null || echo '')" ]]; then
    inject_launcher=false
  fi

  if [[ "$inject_launcher" == "true" ]]; then
    # without this, the command and arguments are passed as args to the default process type
    output="--entrypoint launcher "
  fi

  echo -n "$STDIN$output"
}

trigger-builder-pack-docker-args-process-deploy "$@"