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#!/bin/sh

# move binary packages from staging to testing (if possible [1]) and
# additionally tested packages from testing to the respective stable
# repository (if possible [1])

# The condition [1] is explained in the stored function
# calculate_maximal_moveable_set which is created in bin/bootsrap-mysql

# TODO: separate locks for staging, testing (and stable)

# TODO: sub_pkgrel=0 may or may not be omitted for the actual package :-/

# TODO: keep .testing, .tested, .done in sync

# shellcheck disable=SC2039
# shellcheck source=conf/default.conf
. "${0%/*}/../conf/default.conf"

# shellcheck disable=SC2016
usage() {
  >&2 echo ''
  >&2 echo 'db-update [options] [packages]:'
  >&2 echo ' move tested packages from testing to stable.'
  >&2 echo ' move possible packages from staging to testing.'
  >&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.'
  >&2 echo '  -n|--no-action:   Only print what would be moved.'
  [ -z "$1" ] && exit 1 || exit "$1"
}

eval set -- "$(
  getopt -o bhn \
    --long block \
    --long help \
    --long no-action \
    -n "$(basename "$0")" -- "$@" || \
  echo usage
)"

block_flag='-n'
no_action=false

while true
do
  case "$1" in
    -b|--block)
      block_flag=''
    ;;
    -h|--help)
      usage 0
    ;;
    -n|--no-action)
      no_action=true
    ;;
    --)
      shift
      break
    ;;
    *)
      >&2 echo 'Whoops, forgot to implement option "'"$1"'" internally.'
      exit 42
    ;;
  esac
  shift
done

if [ $# -ne 0 ]; then
  >&2 echo 'db-update: too many arguments'
  usage
fi

if [ -s "${work_dir}/build-master-sanity" ]; then
  >&2 echo 'Build master is not sane.'
  exit
fi

# Create tmp_dir, lock and trap.

tmp_dir=$(mktemp -d "${work_dir}/tmp.db-update.XXXXXXXXXX")
trap 'rm -rf --one-file-system "${tmp_dir}"' EXIT

exec 9> "${package_database_lock_file}"
if ! flock ${block_flag} 9; then
  >&2 echo 'come back (shortly) later - I cannot lock package database.'
  exit 0
fi

exec 8> "${sanity_check_lock_file}"
if ! flock -s ${block_flag} 8; then
  >&2 echo 'come back (shortly) later - sanity-check currently running.'
  exit 0
fi

# shellcheck disable=SC2119
mysql_cleanup

for source_stability in 'testing' 'staging'; do
  find "${tmp_dir}" -mindepth 1 -delete

  # shellcheck disable=SC2016
  {
    printf 'CALL calculate_maximal_moveable_set("%s");\n' \
      "${source_stability}"

    printf 'CREATE TEMPORARY TABLE `rps` (`id` MEDIUMINT, UNIQUE INDEX (`id`));\n'
    printf 'INSERT IGNORE INTO `rps` (`id`)'
    printf ' SELECT `moveable_binary_packages`.`to_repository`'
    printf ' FROM `moveable_binary_packages`;\n'
    printf 'INSERT IGNORE INTO `rps` (`id`)'
    printf ' SELECT `binary_packages`.`repository`'
    printf ' FROM `moveable_binary_packages`'
    printf ' JOIN `binary_packages` ON `moveable_binary_packages`.`id`=`binary_packages`.`id`;\n'
    printf 'INSERT IGNORE INTO `rps` (`id`)'
    printf ' SELECT `binary_packages`.`repository`'
    printf ' FROM `replaced_binary_packages`'
    printf ' JOIN `binary_packages` ON `replaced_binary_packages`.`id`=`binary_packages`.`id`;\n'

    printf 'SELECT "repositories",`repositories`.`name`'
    printf ' FROM `repositories`'
    printf ' JOIN `rps` ON `rps`.`id`=`repositories`.`id`;\n'

    printf 'SELECT "mv.id",`moveable_binary_packages`.`id`,`moveable_binary_packages`.`to_repository`'
    printf ' FROM `moveable_binary_packages`;\n'

    printf 'SELECT "mv",'
    mysql_package_name_query
    printf ',`repositories`.`name`,`new_repo`.`name`'
    printf ' FROM `moveable_binary_packages`'
    printf ' JOIN `binary_packages` ON `moveable_binary_packages`.`id`=`binary_packages`.`id`'
    mysql_join_binary_packages_repositories
    mysql_join_binary_packages_architectures
    printf ' JOIN `repositories` AS `new_repo` ON `new_repo`.`id`=`moveable_binary_packages`.`to_repository`'
    printf ';\n'

    printf 'SELECT "rm.id",`replaced_binary_packages`.`id`'
    printf ' FROM `replaced_binary_packages`;\n'

    printf 'SELECT "rm",'
    mysql_package_name_query
    printf ',`repositories`.`name`'
    printf ' FROM `replaced_binary_packages`'
    printf ' JOIN `binary_packages` ON `replaced_binary_packages`.`id`=`binary_packages`.`id`'
    mysql_join_binary_packages_repositories
    mysql_join_binary_packages_architectures
    printf ';\n'
  } | \
    mysql_run_query | \
    tr '\t' ' ' | \
    grep '^\(repositories\|\(rm\|mv\)\(\.id\)\?\) ' | \
    while read -r what content; do
      printf '%s\n' "${content}" >> \
        "${tmp_dir}/${what}"
    done

  if [ ! -s "${tmp_dir}/repositories" ]; then
    >&2 echo 'Nothing to move from %s.' "${source_stability}"
    continue
  fi

  # shellcheck disable=SC2086
  for s in "${tmp_dir}/"*; do
    sort -u "${s}" | \
      sponge "${s}"
  done

  # receive the repository databases from the master mirror
  mkdir "${tmp_dir}/dbs"
  while read -r repo; do
    mkdir "${tmp_dir}/dbs/${repo}"
    # shellcheck disable=SC2086
    ${master_mirror_rsync_command} \
      "${master_mirror_rsync_directory}/i686/${repo}/${repo}.db."* \
      "${master_mirror_rsync_directory}/i686/${repo}/${repo}.files."* \
      "${tmp_dir}/dbs/${repo}/"
    tar -Oxzf "${tmp_dir}/dbs/${repo}/${repo}.db.tar.gz" --wildcards '*/desc' | \
      sed -n '
        /^%FILENAME%$/{
          N
          s/^\S\+\n\(\S\+-[^-.]\+\)\(-[^-]\+\)/\1.0\2 \1\2/
          T
          p
        }
      '
  done < \
    "${tmp_dir}/repositories" | \
    while read -r old new; do
      for file in 'rm' 'mv'; do
        sed -i '
          s/\(\s\|^\)'"$(str_to_regex "${old}")"'\(\s\|$\)/\1'"${new}"'\2/
        ' "${tmp_dir}/${file}"
      done
    done

  # remove to-be-deleted packages
  while read -r pkgname repo; do
    cd "${tmp_dir}/dbs/${repo}"
    repo-remove -q "${repo}.db.tar.gz" "${pkgname%-*-*-*}"
  done < \
    "${tmp_dir}/rm"

  # delete and add moved packages
  mkdir "${tmp_dir}/transit"
  while read -r pkgname from_repo to_repo; do
    ${master_mirror_rsync_command} \
      "${master_mirror_rsync_directory}/i686/${from_repo}/${pkgname}" \
      "${master_mirror_rsync_directory}/i686/${from_repo}/${pkgname}.sig" \
      "${tmp_dir}/transit/"
    cd "${tmp_dir}/dbs/${from_repo}"
    repo-remove -q "${from_repo}.db.tar.gz" "${pkgname%-*-*-*}"
    cd "${tmp_dir}/dbs/${to_repo}"
    repo-add -q "${to_repo}.db.tar.gz" "${tmp_dir}/transit/${pkgname}"
    rm \
      "${tmp_dir}/transit/${pkgname}" \
      "${tmp_dir}/transit/${pkgname}.sig"
  done < \
    "${tmp_dir}/mv"

  # move the packages remotely via sftp
  {
    sed '
      s,^\(\S\+\) \(\S\+\)$,rm "i686/\2/\1"\nrm "i686/\2/\1.sig",
    ' "${tmp_dir}/rm"
    sed '
      s,^\(\S\+\) \(\S\+\) \(\S\+\)$,rename "i686/\2/\1" "i686/\3/\1"\nrename "i686/\2/\1.sig" "i686/\3/\1.sig",
    ' "${tmp_dir}/mv"
    echo 'quit'
  } | \
    if ${no_action}; then
      sed 's|^|sftp: |'
    else
      ${master_mirror_sftp_command}
    fi

  if ${no_action}; then
    continue
  fi

  # and push our local *.db.tar.gz via rsync
  while read -r repo; do
    # shellcheck disable=SC2086
    ${master_mirror_rsync_command} \
      "${tmp_dir}/dbs/${repo}/${repo}.db."* \
      "${tmp_dir}/dbs/${repo}/${repo}.files."* \
      "${master_mirror_rsync_directory}/i686/${repo}/"
  done < \
    "${tmp_dir}/repositories"

  # shellcheck disable=SC2016
  {
    printf 'CREATE TEMPORARY TABLE `replaced_binary_packages` (`id` BIGINT, UNIQUE KEY (`id`));\n'
    printf 'CREATE TEMPORARY TABLE `moved_binary_packages` (`id` BIGINT, `new_repository` MEDIUMINT, UNIQUE KEY (`id`));\n'
    printf 'LOAD DATA LOCAL INFILE "%s" INTO TABLE `%s`;\n' \
      "${tmp_dir}/mv.id" 'moved_binary_packages' \
      "${tmp_dir}/rm.id" 'replaced_binary_packages'
    printf 'DELETE `binary_packages` FROM `binary_packages`'
    printf ' JOIN `replaced_binary_packages` ON `binary_packages`.`id`=`replaced_binary_packages`.`id`;\n'
    printf 'UPDATE `binary_packages`'
    printf ' JOIN `moved_binary_packages` ON `binary_packages`.`id`=`moved_binary_packages`.`id`'
    printf ' SET `binary_packages`.`repository`=`moved_binary_packages`.`new_repository`;\n'
  } | \
    mysql_run_query
done