#!/bin/sh

# shellcheck source=conf/default.conf
. "${0%/*}/../conf/default.conf"

# shellcheck disable=SC2016
usage() {
  >&2 echo ''
  >&2 echo 'block-package [options] packages-file:'
  >&2 echo ' [un]block packages in packages-file from being built.'
  >&2 echo ''
  >&2 echo 'possible options:'
  >&2 echo '  -h|--help:        Show this help and exit.'
  >&2 echo '  -u|--unblock:     Unblock package instead of blocking it.'
  [ -z "$1" ] && exit 1 || exit "$1"
}

eval set -- "$(
  getopt -o hu \
    --long help \
    --long unblock \
    -n "$(basename "$0")" -- "$@" || \
  echo usage
)"

block=true

while true
do
  case "$1" in
    -h|--help)
      usage 0
    ;;
    -u|--unblock)
      block=false
    ;;
    --)
      shift
      break
    ;;
    *)
      >&2 echo 'Whoops, forgot to implement option "'"$1"'" internally.'
      exit 42
    ;;
  esac
  shift
done

if [ $# -ne 1 ]; then
  >&2 echo 'Too few or too many arguments.'
  usage
fi

input_file="$1"

if ! [ -r "${input_file}" ]; then
  >&2 printf \
    'Cannot open input file "%s".' \
    "${input_file}"
  exit 2
fi

err=0
while read -r package reason; do
  if ! tr ' ' '.' < \
    "${work_dir}/build-list" | \
    grep -qxF "${package}"; then
    >&2 printf 'Package "%s" is not on the build-list.\n' "${package}"
    err=2
    continue
  fi
  if ${block}; then
    if [ -z "${reason}" ]; then
      >&2 printf 'No reason is given for blocking package "%s".\n' "${package}"
      err=2
    else
      echo "${reason}" > \
        "${work_dir}/package-states/${package}.blocked"
    fi
  else
    rm -f "${work_dir}/package-states/${package}.blocked"
  fi
done < \
  "${input_file}"

exit ${err}