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#!/bin/bash

# parameters and default values
ARCH='i686'
DESC='i686 only'
DATE=$(date +%Y.%m.%d)
ISO="archlinux32-${DATE}-${ARCH}.iso"

# fail on first error
set -e

base_dir=$(
  readlink -e "${0%/*}"
)

usage() {
  >&2 echo ''
  >&2 echo 'update-website: update download, torrent, magnet links on'
  >&2 echo ' the Arch32 website'
  >&2 echo ''
  >&2 echo 'possible options:'
  >&2 echo '  -h|--help:    Show this help and exit.'
  >&2 echo ''  
  >&2 echo 'configuration options:'
  >&2 echo "  --arch <arch>         architecture of the ISO to update, default '$ARCH'."
  >&2 echo "  --desc <desc>         description of the ISO to update, default '$DESC'."
  >&2 echo "  --iso                 name of ISO to be checked, default is '${ISO}'."  
  >&2 echo '  --website-dir <dir>   set website-dir to <dir>.'
  >&2 echo '  --mirror-dir <dir>    set mirror-dir to <dir>.'
  >&2 echo '  --magnet-link <link>  set magnet link to <link> for architecture --arch.'
  >&2 echo '  --torrent-seed <link> set torrent seed link to $link for architecture --arch.'
  >&2 echo ''
  >&2 echo 'operations:'
  >&2 echo '  --update-mirrors      regenerate mirror list and country flags.'  
  >&2 echo '  --update-iso          update information about ISO, too.'
  
  [ -z "$1" ] && exit 1 || exit "$1"
}

eval set -- "$(
  getopt -o h \
  --long help \
  --long arch: \
  --long desc: \
  --long iso: \
  --long website-dir: \
  --long mirror-dir: \
  --long magnet-link: \
  --long torrent-seed: \
  --long update-mirrors \
  --long update-iso \
  -n "$(basename "$0")" -- "$@" || \
  echo usage
)"

# cleanup hook
tmp_dir="$(mktemp -d)"
cleanup() {
  if mountpoint -q "${tmp_dir}"; then
    sudo umount "${tmp_dir}"
  fi
  rm -rf --one-file-system "${tmp_dir}"
}
trap cleanup EXIT

arch="${ARCH}"
desc="${DESC}"
iso="${ISO}"

while [ $# -gt 0 ]; do
  case "$1" in
    '--arch')
      shift
      arch="$1"
    ;;
    '--desc')
      shift
      desc="$1"
    ;;
    '--iso')
      shift
      iso="$1"
    ;;
    '--website-dir')
      if [ -s "${tmp_dir}/website_dir.set" ]; then
        printf 'Option %s given multiple times.\n' "$1"
        usage
      fi
      shift
      website_dir="$1"
      echo "$website_dir" > "${tmp_dir}/website_dir.set"
    ;;
    '--mirror-dir')
      if [ -s "${tmp_dir}/mirror_dir.set" ]; then
        printf 'Option %s given multiple times.\n' "$1"
        usage
      fi
      shift
      mirror_dir="$1"
      echo "$mirror_dir" > "${tmp_dir}/mirror_dir.set"
    ;;
    '--magnet-link')
      if [ -s "${tmp_dir}/magnet.link.set" ]; then
        printf 'Option %s given multiple times.\n' "$1"
        usage
      fi
      shift
      echo "$1" | \
        tr -d '\n' > \
        "${tmp_dir}/magnet.link.set"
    ;;
    '--torrent-seed')
      if [ -s "${tmp_dir}/torrent-seed.set" ]; then
        printf 'Option %s given multiple times.\n' "$1"
        usage
      fi
      shift
      echo "$1" | \
        tr -d '\n' > \
        "${tmp_dir}/torrent-seed.set"
    ;;
    '--update-mirrors')
      if [ -s "${tmp_dir}/update_mirrors.set" ]; then
        printf 'Option %s given multiple times.\n' "$1"
        usage
      fi
      echo "true" > "${tmp_dir}/update_mirrors.set"
    ;;
    '--update-iso')
      if [ -s "${tmp_dir}/update_iso.set" ]; then
        printf 'Option %s given multiple times.\n' "$1"
        usage
      fi
      echo "true" > "${tmp_dir}/update_iso.set"
    ;;
    '--help'|'-h')
      usage 0
    ;;
    '--')
      shift
      break
    ;;
    *)
      >&2 printf 'Whoops, option "%s" is not yet implemented!\n' "$1"
      exit 42
    ;;
  esac
  shift
done

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

# generate list of download mirrors
if [ -s "${tmp_dir}/update_mirrors.set" ]; then
  (
    printf '    <div id="download-mirrors">\n'
    curl -Ss 'https://archlinux32.org/mirrorlist/?country=all&hash='"$(
      head -c 24 /dev/urandom | \
        base64 -w0
    )" | \
      sed '
        0,/^$/d
        /^$/d
        /^## /{
          s|^## |\n        </ul>\n\n        <h5>|
          s|$|</h5>\n\n        <ul>\n|
          '"$(
            while read -r flag country; do
              printf \
                's|<h5>%s</h5>|<h5><span class="fam-flag fam-flag-%s" title="%s"></span> %s</h5>|\n' \
                "${country}" \
                "${flag}" \
                "${country}" \
                "${country}"
            done < \
              "${0%/*}/flag-names"
          )"'
        }
        /^#Server = /{
          s|^#Server = \(.*//\)\([^/]*\)\(/.*\)\$arch/\$repo/\?$|'"$(
            printf \
              '            %s\\n' \
              '<li><a href="\1\2\3archisos/"' \
              '    title="Download from \1\2\3">\2</a></li>'
          )"'|
        }
      ' | \
      sed '
        0,/<\/ul>/d
      '
    printf '        </ul>\n\n'
    printf '    </div>\n'
  ) | \
    sed -i '
      :emptyLines
      /^\n*$/{
        N
        bemptyLines
      }
      /^\(\s*\n\)*\s*<div id="download-mirrors">$/{
        :a
        s|^.*</div>||
        tb
        $!N
        ba
        :b
        r /dev/stdin
      }
    ' "${website_dir}/download/index.html"
fi

# date of the ISO
date=$(echo "${iso}" \
  | sed 's/^.*-\([^-]\+\)-[^-]\+$/\1/' \
  | sort -u
)

# update magnet links
if [ -s "${tmp_dir}/magnet.link.set" ]; then
  if ! tr '&' '\n' < \
    "${tmp_dir}/magnet.link.set" | \
    grep -qxF "dn=${iso}"; then
    sed -i '
      /<li>(<strike>)?<a href="magnet:?.*-'"${arch}"'\.iso/ s/href="[^"]\+"/href="'"$(sed 's|&|\\&|g' "${tmp_dir}/magnet.link.set")"'"/
      /title="Magnet link">Magnet link for \S\+ ('"${desc}"')/ s/>Magnet link for \S\+ />Magnet link for '"${date}"' /
    ' "${website_dir}/download/index.html"
  else     
    >&2 printf 'Magnet link for %s is not for %s, skipping.\n' "${arch}" "${iso}"
  fi
fi

# update torrent links
if [ -s "${tmp_dir}/torrent-seed.set" ]; then
  if grep -qF "archlinux32-${date}-${arch}" "${tmp_dir}/torrent-seed.set"; then
    sed -i '
    /<li>(<strike>)?<a href="http.*-'"${arch}"'\.iso.torrent/ s/href="[^"]\+"/href="'"$(sed -e 's_/_\\/_g' "${tmp_dir}/torrent-seed.set")"'"/
      /title="Download torrent">Torrent for \S\+ ('"${desc["${arch}"]}"')/ s/>Torrent for \S\+ />Torrent for '"${date}"' /
    ' "${website_dir}/download/index.html"
  else
    >&2 printf 'Torrent seed for %s is not for %s, skipping.\n' "${arch}" "${iso}"
  fi
fi

# update ISO links and information
if [ -s "${tmp_dir}/update_iso.set" ]; then
  if [ ! -f "${mirror_dir}/archisos/${iso}" ]; then
    >&2 echo "Can't find iso to arch '${mirror_dir}/archisos/${iso}'."
    exit 1
  fi
  kernel="$("${base_dir}"/check-iso --output-dir "${mirror_dir}/archisos" --kernel-version)"
  size="$("${base_dir}"/check-iso --output-dir "${mirror_dir}/archisos" --size)"
  md5="$("${base_dir}"/check-iso --output-dir "${mirror_dir}/archisos" --md5sum)"
  sha512="$("${base_dir}"/check-iso --output-dir "${mirror_dir}/archisos" --sha512sum)"
  sign_key="$("${base_dir}"/check-iso --output-dir "${mirror_dir}/archisos" --sign-key)"
fi

# adapt release info on the top
values=(
  'Current Release' "${date}"
  'Included Kernel' "${kernel}"
  'PGP Key' '<a href="http://www.archlinux32.org/buildmaster/gpg-keys.php?fp='"${sign_key}"'">'"${sign_key}"'</a>'
)
sed -i "$(
  printf '/%s:/s|</strong>.*</li>|</strong> %s</li>|\n' "${values[@]}"
)
" \
  "${website_dir}/download/index.html"

# adapt values for each ISO
values=(
  "ISO Size (${desc})" "${size} MB"
  "MD5 (${desc})" "${md5}"
  "SHA512 (${desc})" "${sha512}"
)
sed -i "$(
  printf '/%s:/s|</strong>.*</li>|</strong> %s</li>|\n' "${values[@]}"
)
" \
  "${website_dir}/download/index.html"

# adapt dates in signatures
sed -i "$(
  printf '/archlinux32-[0-9.]\+-%s\.iso\.sig/s@archlinux32-[0-9.]\+-%s\.iso\.sig@archlinux32-%s-%s.iso.sig@\n' \
    "${arch}" "${arch}" "${date}" "${arch}"
)
" \
  "${website_dir}/download/index.html"

exit 0