#!/bin/bash

# args: $1 base Dockerfile, $2 optional tags file

set -e

usage () {
  echo Usage: ./build_base.sh [-h,  --help] [tags-file]
  echo
  echo Builds the taler_local/taler_base base image, optionally
  echo using the 'tags-file', a text file containing environment
  echo variables definitions to specify to which Git tag each Taler
  echo component should be pulled.  The following tags exist:
  echo TAG_LIBMHD, TAG_GNUNET, TAG_EXCHANGE, TAG_MERCHANT,
  echo TAG_WALLET, TAG_LIBEUFIN, TAG_MERCHANT_DEMOS, TAG_SYNC.
  echo If tags-file is missing, all the code will be pulled
  echo from master\'s HEAD.
}

for helpOpt in "-h" "--help"; do
  if test "$helpOpt" = "${1:-}"; then
    usage
    exit 0
  fi
done

if ! which realpath > /dev/null; then
  echo "Please, install 'realpath' (coreutils)"
fi

DOCKER_FILE="$(dirname $(realpath $BASH_SOURCE))/images/base/Dockerfile"

# Check base file.
if ! test -a $DOCKER_FILE; then
  echo Base Dockerfile: $DOCKER_FILE not found.
  exit 1
fi

# Allows extra features to conditionally copy files
# from the host during the build.  That solves the
# case where the tag file is not given.
export DOCKER_BUILDKIT=1

mkdir -p buildconfig

# --help option not found in $1, check for the tags-file.
if test -n "$1"; then
  ! test -a "$1" && (echo "Tag file: $1 not found." && exit 1) 
  cp $1 buildconfig/tags.sh
else
  echo "" > buildconfig/tags.sh
fi

docker build --no-cache \
  -t taler_local/taler_base \
  -f $DOCKER_FILE .