#!/bin/bash

# parameters
MIRROR_DIR="/srv/http/mirror/mirror.archlinux32.org"
ARCHIVE_DIR="/srv/http/mirror/archive.archlinux32.org"

usage() {
  >&2 echo ""
  >&2 echo "cleanup-isos: cleanup mirror and archive ISOs of Archlinux32"
  >&2 echo ""
  >&2 echo "possible options:"
  >&2 echo "  -h|--help:       show this help and exit."
  >&2 echo "  --mirror-dir     where are the ISOs stored on the mirror, default is '$MIRROR_DIR'."
  >&2 echo "  --archive-dir    where are the ISOs stored in the archive, default is '$ARCHIVE_DIR'."
  >&2 echo "  -n               do not do anything, just print what would be done."
  [ -z "$1" ] && exit 1 || exit "$1"
}

# fail on first error
set -e

# cleanup hook
tmp_dir="$(mktemp -d)"
cleanup() {
  rm -rf --one-file-system "${tmp_dir}"
}
trap cleanup EXIT

eval set -- "$(
  getopt -o hn \
  --long help \
  --long mirror-dir: \
  --long archive-dir: \
  -n "$(basename "$0")" -- "$@" || \
  echo usage
)"

mirror_dir="${MIRROR_DIR}"
archive_dir="${ARCHIVE_DIR}"
do_it=1

while [ $# -gt 0 ]; do
  case "$1" in
    '--mirror-dir')
      shift
      mirror_dir="$1"
      ;;
    '--archive-dir')
      shift
      archive_dir="$1"
      ;;
    '-n')
      do_it=0
      ;;
    '--help'|'-h')
      usage 0
    ;;
    '--')
      shift
      break
    ;;
    *)
      printf 'Whoops, option "%s" is not yet implemented!\n' "$1" >&2
      exit 42
    ;;
  esac
  shift
done

if [ $# -gt 0 ]; then
  >&2 echo 'Too many arguments.'
  exit 2
fi

archiso_dir="${mirror_dir}/archisos/"
archived_archiso_dir="${archive_dir}/iso/"

echo "checking for old isos in '${archiso_dir}'..."

find "${archiso_dir}" \( -name 'archlinux32-*' -o -name 'archlinux-*' \) -not -name 'archlinux32-'"${date}"'-*' \
| while read -r to_delete; do
  archived_file="${archived_archiso_dir}/${to_delete#${archiso_dir}/}"
  if [ -f "${to_delete}" -a -f "${archived_file}" ]; then
    if diff -q "${to_delete}" "${archived_file}" >/dev/null; then
      rm "${to_delete}"
      printf '%s\n' "${to_delete}" \
      | sed '
        s@^.*/@@
        s/\./\\./g
        s@.*@/  \0$/d@
      '
    fi
  fi
done \
>> "${tmp_dir}/delete-regex"
sed -i -f "${tmp_dir}/delete-regex" "${archiso_dir}/sha512sums"
sed -i -f "${tmp_dir}/delete-regex" "${archiso_dir}/md5sums"

echo '... done.'

exit 0