#!/bin/bash

# Pulls the tagged multistage targets from a remote repo and then outputs the
# --cache-from arguments that can be used in a docker build to speed up the
# build.
#
# These remote image tags are created by the "tag-and-push-targets" script in
# this dir.

set -euo pipefail

SCRIPT_DIR="$( cd "$( dirname "${BASH_SOURCE[0]}" )" && pwd )"

DEV_IMAGE=${DEV_IMAGE:-"quay.io/signalfx/signalfx-agent-image-cache"}

stages=$($SCRIPT_DIR/dockerfile-stages ${1-})

for s in $stages; do
  # If the pull fails, it just means the cache won't be used.
  docker pull $DEV_IMAGE:stage-$s >&2 || true
  echo -n "--cache-from $DEV_IMAGE:stage-$s "
done