#!/bin/bash

# runs on the buildmaster only, works currently only there
#
# calls all subscripts to build the iso, sign it, generate checksums,
# update the website, update RSS feeds, feed the torrents, etc.
#
# this script is supposed to be used by Archlinux32 people only
# as it contains hard-coded pathes and server names..

# prerequisites:
# - mkinitcpio-archiso32 and archiso32 installed on the host
# - https://git.archlinux32.org/releng checked out locally
# - pacman-mirrorlist32 for /etc/pacman.d/mirrorlist32
# - mktorrent, python-feedgenerator, transmission-cli, hefur

# parameters
CONFIG="releng"
ARCH="i686"
#ARCH = "dual"
DESC="i686 only"
#DESC="dual bootable"
DATE=$(date +%Y.%m.%d)
#DATE="2022.02.01"
ISO="archlinux32-${DATE}-${ARCH}.iso"
SIGNATURE="${ISO}.sig"
TORRENT="${ISO}.torrent"
TORRENT_SERVER="archlinux32.org"
TORRENT_USER="hefur"
WEBSITE_DIR="/srv/http/archlinux32.org"
MIRROR_DIR="/srv/http/mirror/mirror.archlinux32.org"
ARCHISOS_DIR="${MIRROR_DIR}/archisos/"
ARCHIVE_DIR="/srv/http/mirror/archive.archlinux32.org/iso"
MIRROR_USER='mirror'
MIRROR_GROUP='mirror'
#Andreas Baumann (sign) <mail@andreasbaumann.cc>
#SIGN_KEY='16194A82231E9EF823562181C8E8F5A0AF9BA7E7'
# Archlinux 32 Release Key <release@archlinux32.org>
SIGN_KEY='33CA3597B0D161AAE4173F65C17F1214114574A4'

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

pushd() {
    command pushd "$@" > /dev/null
}

popd() {
    command popd "$@" > /dev/null
}

export pushd popd

usage() {
  >&2 echo ""
  >&2 echo "build-all: do all release engineering for Archlinux32 ISOs and downloads"
  >&2 echo ""
  >&2 echo "possible options:"
  >&2 echo "  -h|--help:       show this help and exit."
  >&2 echo "  -f|--force:      overwrite already existing artifacts (use with care!)."  
  >&2 echo "  -t|--test:       test mode, generate artifacts, but don't pusblish anything."
  [ -z "$1" ] && exit 1 || exit "$1"
}

# fail on first error
set -e

# 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

eval set -- "$(
  getopt -o hft \
  --long force \
  --long test \
  --long help \
  -n "$(basename "$0")" -- "$@" || \
  echo usage
)"

force=0
testmode=0

while [ $# -gt 0 ]; do
  case "$1" in
    '--force'|'-f')
      force=1
    ;;
    '--test'|'-t')
      testmode=1
    ;;
    '--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

# build the ISO
pushd "${ARCHISOS_DIR}"
if [ $force = 1 ]; then
  rm -f "${ISO}"
fi
if [ ! -f "${ISO}" ]; then
  echo "Building ISO.."
  "${base_dir}/build-iso" --config="${CONFIG}" --arch "${ARCH}" \
    --output-dir="${ARCHISOS_DIR}" --iso "${ISO}"
else
  echo "Refusing to overwrite existing ISO '${ISO}'."
fi
popd

if [ ! -f "${ARCHISOS_DIR}/${ISO}" ]; then
  >&2 echo "The ISO file '${ISO}' does not exist, it makes no sense to continue."
  exit 1
fi

# sign ISO
pushd "${ARCHISOS_DIR}"
if [ $force = 1 ]; then
  rm -f "${ISO}.sig"
fi
if [ ! -f "${ISO}.sig" ]; then
  echo "Signing ISO.."
  gpg --local-user "${SIGN_KEY}" --batch --no-tty --detach-sign "${ISO}" </dev/null
else
  echo "ISO '${ISO}' is already signed."
fi
popd

# checksum the ISO
echo "Updating checksum files.."
pushd "${ARCHISOS_DIR}"
if [ $(grep "${ISO}$" sha512sums | wc -l) = 0 ]; then
  [ ! -f sha512sums ] || sed -i "/${ISO}$/d" sha512sums
  sha512sum "${ISO}" >> sha512sums
  sort -k2,2 sha512sums --output sha512sums
else
  echo "SHA512 checksum already done."
fi
if [ $(grep "${ISO}$" md5sums | wc -l) = 0 ]; then
  [ ! -f md5sums ] || sed -i "/${ISO}$/d" md5sums
  md5sum "${ISO}" >> md5sums
  sort -k2,2 md5sums --output md5sums
else
  echo "MD5 checksum already done."
fi
popd

# check sanity of ISO
echo "Checking ISO.."
"${base_dir}/check-iso" \
  --output-dir "${ARCHISOS_DIR}" --iso="${ISO}" --check --expected-sign-key "${SIGN_KEY}"
if [ $? = 1 ]; then
  >&2 echo "The ISO file '${iso}' is not sane. Not continuing! You should maybe delete this ISO file.."
  exit 1
fi

# generate torrents
echo "Generating torrents.."
pushd "${ARCHISOS_DIR}"
if [ $force = 1 ]; then
  rm -f "${ISO}.torrent"
fi
if [ ! -f "${ISO}.torrent" ]; then
  "${base_dir}/build-torrent" \
    --arch="${ARCH}" \
    --date="${DATE}" \
    --mirror-dir="${MIRROR_DIR}" \
    --torrent-server="${TORRENT_SERVER}" \
    --torrent-user="${TORRENT_USER}"
else
  echo "The torrent file '${ISO}.torrent' already exists, not generating a new one."
fi

# get the magnet link and add it to the RSS feed file
echo "Generating magnet link and publish it in the RSS feed file.."
magnet_link="$("${base_dir}"/build-torrent --arch="${ARCH}" --date="${DATE}" --mirror-dir="${MIRROR_DIR}" --magnet-link)"
if [ $force = 1 ]; then
  rm -f "feed_${ARCH}.rss"
fi
if [ ! -f "feed_${ARCH}.rss" ]; then
  feed_url="https://pool.mirror.archlinux32.org/archisos/feed_${ARCH}.rss"
  "${base_dir}/magnet2feed.py" \
    "${magnet_link}" "${ARCH}" "${DATE}" "${feed_url}"
else
  echo "The RSS feed file 'feed_${ARCH}.rss' already exists, not generating a new one."
fi

# update web page for isos and download mirrors
if [ $testmode = 0 ]; then
  echo "Updating website.."
  git -C "${WEBSITE_DIR}" reset --hard
  git -C "${WEBSITE_DIR}" pull --ff-only
fi
"${base_dir}/update-website" \
  --website-dir="${WEBSITE_DIR}" \
  --mirror-dir="${MIRROR_DIR}" \
  --iso="${ISO}" \
  --update-iso \
  --update-mirrors \
  --torrent-seed="https://pool.mirror.archlinux32.org/archisos/archlinux32-${DATE}-${ARCH}.iso.torrent" \
  --magnet-link="${magnet_link}"
if [ $testmode = 0 ]; then
  git -C "${WEBSITE_DIR}" commit 'download/index.html' -m 'download/index.html: new isos ('"${DATE}"')'
  git -C "${WEBSITE_DIR}" push
fi

# when did we last updates the 
date +%s > "${ARCHISOS_DIR}/lastupdate"

# cleanup mirror and move old ISOs to the archive
echo "Cleaning up old ISOs and pushing them into the archive"
 "${base_dir}/cleanup-isos" \
  --mirror-dir="/srv/http/mirror/mirror.archlinux32.org" \
  --archive-dir="/srv/http/mirror/archive.archlinux32.org"

# set permissions correctly of all generated or changed fles
echo "Fixing/setting permissions.."
chown "${MIRROR_USER}:${MIRROR_GROUP}" \
  "${ARCHISOS_DIR}/${ISO}" "${ARCHISOS_DIR}/${SIGNATURE}" "${ARCHISOS_DIR}/${TORRENT}" \
  "${ARCHISOS_DIR}/sha512sums" "${ARCHISOS_DIR}/md5sums" "${ARCHISOS_DIR}/lastupdate"

echo "Finished."

exit 0