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#!/bin/sh

# move binary packages from staging to testing (if possible [1]) and
# additionally all packages specified on the command line from testing
# to the respective stable repository

# 1] Condition for moving a package A from staging to testing is that:
#   a) nothing on the build-list depends on A and
#   b) no done package B which is not being moved depends on A

# TODO:

#  the meta data used to evaluate condition "b" might be for a different
#    version

#  correctly handle if multiple versions of a single package are marked
#    as "done"

. "${0%/*}/../conf/default.conf"

usage() {
  >&2 echo ''
  >&2 echo 'db-update [options] [packages]:'
  >&2 echo ' move possible packages from staging to testing.'
  >&2 echo ' move packages on the command line from testing to stable.'
  >&2 echo ''
  >&2 echo 'possible options:'
  >&2 echo '  -b|--block:   If necessary, wait for lock blocking.'
  >&2 echo '  -h|--help:    Show this help and exit.'
  [ -z "$1" ] && exit 1 || exit $1
}

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

block_flag='-n'

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

packages_to_stabilize=${@}

for package in ${packages_to_stabilize}; do
  # some sanity checks
  if [ ! -f "${work_dir}/package-states/${package}.testing" ]; then
    >&2 echo "Package '${package}' is not in testing!"
    exit 2
  fi
done

updated_package_database=false

# Create a lock file and a trap.

exec 9> "${build_list_lock_file}"
if ! flock ${block_flag} 9; then
  >&2 echo 'come back (shortly) later - I cannot lock build list.'
  exit 1
fi

exec 8> "${package_database_lock_file}"
if ! flock ${block_flag} 8; then
  >&2 echo 'come back (shortly) later - I cannot lock package database.'
  exit 1
fi

tmp_dir="$(mktemp -d)"

clean_up_lock_file() {
  rm -f "${package_database_lock_file}" "${build_list_lock_file}"
  rm -rf --one-file-system "${tmp_dir}"
}

trap clean_up_lock_file EXIT

# sanity check

if [ -n "$(
  ls "${work_dir}/package-states" | \
    grep '\.done$' | \
    sed 's|\(\.[^.]\+\)\{4\}$||' | \
    sort | \
    uniq -d)" ]; then
  >&2 echo 'Removing duplicates not yet implemented!'
  exit 42
fi

# packages which can't be un-staged because they're still dependencies
# of any job on the build-list

while read -r pkg pkg_rev mod_rev repo; do
  cat "${work_dir}/package-infos/${pkg}.${pkg_rev}.${mod_rev}.depends"
done < \
  "${work_dir}/build-list" | \
  sort -u > \
  "${tmp_dir}/keep_packages"

# packages which are done

ls "${work_dir}/package-states" | \
  grep '\.done$' | \
  sed 's|^\(.*\)\(\(\.[^.]\+\)\{3\}\)\.done$|\1 \1\2|' | \
  sort > \
  "${tmp_dir}/done_packages"

# remove packages not yet done from keep-packages list

keep_packages="$(
  join -1 1 -2 1 -o 2.2 \
    "${tmp_dir}/keep_packages" \
    "${tmp_dir}/done_packages"
)"
printf '%s\n' "${keep_packages}" > \
  "${tmp_dir}/keep_packages"

# packages which can't be unstaged
mv \
  "${tmp_dir}/keep_packages" \
  "${tmp_dir}/new_keep_packages"
keep_packages=''

while [ -s "${tmp_dir}/new_keep_packages" ]; do

  while read -r package; do
    generate_package_metadata "${package}"
  done < "${tmp_dir}/new_keep_packages"

  keep_packages="$(
    (
      printf '%s\n' "${keep_packages}"
      cat "${tmp_dir}/new_keep_packages"
    ) | \
      sort -u | \
      grep -v '^$'
  )"

  new_keep_packages="$(
    while read -r package; do
      cat "${work_dir}/package-infos/${package%.*}.depends"
    done < \
      "${tmp_dir}/new_keep_packages" | \
      sort -u
  )"
  printf '%s\n' "${new_keep_packages}" > \
    "${tmp_dir}/new_keep_packages"

  new_keep_packages="$(
    join -1 1 -2 1 -o 2.2 \
      "${tmp_dir}/new_keep_packages" \
      "${tmp_dir}/done_packages"
  )"

  # "new" is only what has not been there before
  printf '%s\n' "${keep_packages}" "${keep_packages}" "${new_keep_packages}" | \
    sort | \
    uniq -u > \
    "${tmp_dir}/new_keep_packages"

done

done_packages="$(cat "${tmp_dir}/done_packages")"

# unlock build list

rm -f "${build_list_lock_file}"
flock -u 9

rm -rf --one-file-system "${tmp_dir}"

clean_up_lock_file() {
  rm -f "${package_database_lock_file}"
}

# calculate unstageable packages from keep_packages and done_packages

done_packages="$(
  echo "${done_packages}" | \
    cut -d' ' -f2
)"

done_packages="$(
  (
    printf '%s\n' "${done_packages}" "${keep_packages}"
  ) | \
    sort | \
    uniq -u
)"

unset keep_packages

for package in ${done_packages}; do
  parts=$(cat "${work_dir}/package-states/${package}.done")
  parts_names=$(
    printf '%s\n' ${parts} | \
      sed 's|\(-[^-]\+\)\{3\}\.pkg\.tar\.xz$||'
  )
  is_community="$(official_or_community "${package}")"
  cd "${master_mirror_directory}/i686/${is_community}staging"
  mkdir -p "../${is_community}testing"
  repo-remove "${is_community}staging.db.tar.gz" ${parts_names}
  for part in ${parts}; do
    mv "${part}" "${part}.sig" "../${is_community}testing/"
    updated_package_database=true
  done
  cd "${master_mirror_directory}/i686/${is_community}testing"
  repo-add "${is_community}testing.db.tar.gz" ${parts}
  for part in ${parts}; do
    remove_old_package_versions "${part}"
  done

  mv \
    "${work_dir}/package-states/${package}.done" \
    "${work_dir}/package-states/${package}.testing"
done

# move packages in packages_to_stabilize from *testing/ to the stable repos
for package in ${packages_to_stabilize}; do
  parts=$(cat "${work_dir}/package-states/${package}.testing")
  parts_names=$(
    printf '%s\n' ${parts} | \
      sed 's|\(-[^-]\+\)\{3\}\.pkg\.tar\.xz$||'
  )
  source="$(official_or_community ${package})testing"
  destination="${package##*.}"
  cd "${master_mirror_directory}/i686/${source}"
  repo-remove "${source}.db.tar.gz" ${parts_names}
  for part in ${parts}; do
    mv "${part}" "${part}.sig" "../${destination}/"
    updated_package_database=true
  done
  cd "${master_mirror_directory}/i686/${destination}"
  repo-add "${destination}.db.tar.gz" ${parts}
  for part in ${parts}; do
    remove_old_package_versions "${part}"
  done

  rm "${work_dir}/package-states/${package}.testing"
done

if ${updated_package_database}; then
  date '+%s' > \
    "${master_mirror_directory}/lastupdate"
fi