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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: we should delete more packages than just the ones in repositories
# where we move to (think of [extra] -> [community])

# 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:'
  >&2 echo '    If necessary, wait for lock blocking.'
  >&2 echo '  -h|--help:'
  >&2 echo '    Show this help and exit.'
  >&2 echo '  -n|--no-action:'
  >&2 echo '    Only print what would be moved.'
  >&2 echo '  -p|--progressive:'
  >&2 echo '    Move forward any package which replaces no package whose'
  >&2 echo '    dependencies are all available somewhere.'
  >&2 echo '    Note, that this _may_ move _less_ packages.'
  [ -z "$1" ] && exit 1 || exit "$1"
}

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

block_flag='-n'
no_action=false
progressive=false

while true
do
  case "$1" in
    -b|--block)
      block_flag=''
    ;;
    -h|--help)
      usage 0
    ;;
    -n|--no-action)
      no_action=true
    ;;
    -p|--progressive)
      progressive=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

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

  # shellcheck disable=SC2016
  {
    if ${progressive}; then
      printf 'DROP TEMPORARY TABLE IF EXISTS `%s_binary_packages`;\n' \
        'moveable' 'replaced'
      printf 'CREATE TEMPORARY TABLE `replaced_binary_packages` (`id` BIGINT, `replaced_by` BIGINT, UNIQUE KEY (`id`));\n'
      printf 'CREATE TEMPORARY TABLE `moveable_binary_packages` (`id` BIGINT, `to_repository` MEDIUMINT, UNIQUE KEY (`id`));\n'

      printf 'INSERT IGNORE INTO `replaced_binary_packages` (`id`,`replaced_by`)'
      printf ' SELECT `binary_packages`.`id`,`subst_bp`.`id`'
      printf ' FROM `binary_packages`'
      mysql_join_binary_packages_repositories
      printf ' AND `repositories`.`is_on_master_mirror`'
      mysql_join_binary_packages_build_assignments
      mysql_join_build_assignments_package_sources
      mysql_join_package_sources_upstream_repositories
      mysql_join_upstream_repositories_repository_moves
      printf ' AND `repository_moves`.`to_repository`=`binary_packages`.`repository`'
      printf ' JOIN `binary_packages` AS `subst_bp`'
      printf ' ON `binary_packages`.`pkgname`=`subst_bp`.`pkgname`'
      printf ' AND `repository_moves`.`from_repository`=`subst_bp`.`repository`'
      mysql_join_binary_packages_repositories 'subst_bp' 'subst_r'
      mysql_join_repositories_repository_stabilities 'subst_r' 'subst_rs'
      printf ' AND `subst_rs`.`name`="%s"' \
        "${source_stability}"
      # TODO: we may relax this condition, if we a) got rid of state files
      # or b) improved keeping them in sync (*.testing -> /dev/null is not
      # implemented, only .tested -> /dev/null)
      if [ ! "${source_stability}" = 'staging' ]; then
        printf ' AND `subst_bp`.`is_tested`'
      fi
      mysql_join_binary_packages_dependencies
      mysql_join_dependencies_dependency_types
      printf ' AND `dependency_types`.`relevant_for_binary_packages`'
      printf ' WHERE NOT EXISTS ('
        printf 'SELECT * FROM `install_target_providers`'
        printf ' WHERE `install_target_providers`.`install_target`=`dependencies`.`depending_on`'
      printf ');\n'

      printf 'INSERT IGNORE INTO `moveable_binary_packages` (`id`,`to_repository`)'
      printf ' SELECT `replaced_binary_packages`.`replaced_by`,`binary_packages`.`repository`'
      printf ' FROM `replaced_binary_packages`'
      printf ' JOIN `binary_packages` ON `binary_packages`.`id`=`replaced_binary_packages`.`id`'
      printf ';\n'

      printf 'INSERT IGNORE INTO `moveable_binary_packages` (`id`,`to_repository`)'
      printf ' SELECT `binary_packages`.`id`,`repository_moves`.`to_repository`'
      printf ' FROM `binary_packages`'
      mysql_join_binary_packages_repositories
      printf ' AND `repositories`.`is_on_master_mirror`'
      mysql_join_repositories_repository_stabilities
      printf ' AND `repository_stabilities`.`name`="%s"' \
        "${source_stability}"
      # TODO: we may relax this condition, if we a) got rid of state files
      # or b) improved keeping them in sync (*.testing -> /dev/null is not
      # implemented, only .tested -> /dev/null)
      if [ ! "${source_stability}" = 'staging' ]; then
        printf ' AND `binary_packages`.`is_tested`'
      fi
      mysql_join_binary_packages_build_assignments
      mysql_join_build_assignments_package_sources
      mysql_join_package_sources_upstream_repositories
      mysql_join_upstream_repositories_repository_moves
      printf ' AND `repository_moves`.`from_repository`=`binary_packages`.`repository`'
      printf ' WHERE NOT EXISTS ('
        printf 'SELECT * FROM `binary_packages` AS `repl_bp`'
        printf ' WHERE `repl_bp`.`pkgname`=`binary_packages`.`pkgname`'
        printf ' AND `repl_bp`.`repository`=`repository_moves`.`to_repository`'
      printf ');\n'
    else
      printf 'CALL calculate_maximal_moveable_set("%s");\n' \
        "${source_stability}"
    fi

    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 "${tmp_dir}/repositories" ]; then
    >&2 printf 'Nothing to move from %s.\n' "${source_stability}"
    continue
  fi

  touch \
    "${tmp_dir}/mv" \
    "${tmp_dir}/mv.id" \
    "${tmp_dir}/rm" \
    "${tmp_dir}/rm.id"

  # 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
  # shellcheck disable=SC2094
  cut -d' ' -f2 < \
    "${tmp_dir}/rm" | \
    sort -u | \
    while read -r repo; do
      grep " $(str_to_regex "${repo}")\$" "${tmp_dir}/rm" | \
        sed '
          s/\(-[^-]\+\)\{3\} \S\+$//
        ' | \
        xargs -r repo-remove -q "${tmp_dir}/dbs/${repo}/${repo}.db.tar.gz"
    done

  # copy and delete moved packages
  # shellcheck disable=SC2094
  cut -d' ' -f2,3 < \
    "${tmp_dir}/mv" | \
    sort -u | \
    while read -r from_repo to_repo; do
      grep " $(str_to_regex "${from_repo}") $(str_to_regex "${to_repo}")\$" "${tmp_dir}/mv" | \
        sed '
          s/-[^-]\+ \S\+ \S\+$//
        ' | \
        xargs -r "${base_dir}/bin/repo-copy" \
          "${tmp_dir}/dbs/${from_repo}/${from_repo}.db.tar.gz" \
          "${tmp_dir}/dbs/${to_repo}/${to_repo}.db.tar.gz"
      grep " $(str_to_regex "${from_repo}") $(str_to_regex "${to_repo}")\$" "${tmp_dir}/mv" | \
        sed '
          s/\(-[^-]\+\)\{3\} \S\+ \S\+$//
        ' | \
        xargs -r repo-remove -q \
          "${tmp_dir}/dbs/${from_repo}/${from_repo}.db.tar.gz"
    done

  # 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` COLUMNS TERMINATED BY " ";\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

  sed_apply_rm=$(
    while read -r pkg _ _; do
      printf '/^%s$/d\n' "$(str_to_regex "${pkg}")"
    done < \
      "${tmp_dir}/rm"
  )

  sed_apply_remove_part_of_mv=$(
    while read -r pkg _ _; do
      printf '/^%s$/d\n' "$(str_to_regex "${pkg}")"
    done < \
      "${tmp_dir}/mv"
  )

  sed_apply_move_part_of_mv=$(
    while read -r pkg _ _; do
      printf '/^%s$/{\n' "$(str_to_regex "${pkg}")"
      printf 'w %%s\n'
      printf 'd\n'
      printf '}\n'
    done < \
      "${tmp_dir}/mv"
  )

  find "${work_dir}/package-states/" \
    \( \
      -name '*.done' -o \
      -name '*.testing' -o \
      -name '*.tested' \
    \) \
    -exec sed -i "${sed_apply_rm}" '{}' \;
  find "${work_dir}/package-states/" \
    -name '*.tested' \
    -exec sed -i "${sed_apply_remove_part_of_mv}" '{}' \;
  find "${work_dir}/package-states/" \
    -name '*.done' \
    -exec grep -qxF "$(cut -d' ' -f1 < "${tmp_dir}/mv")" '{}' \; \
    -printf '%p\n' | \
    while read -r sf; do
      sed -i "$(
        printf '%s\n' "${sed_apply_move_part_of_mv}" | \
          sed '
            s,%s,'"${sf%.done}.testing"',g
          '
      )" "${sf}"
    done
  find "${work_dir}/package-states/" \
    \( \
      -name '*.done' -o \
      -name '*.testing' -o \
      -name '*.tested' \
    \) \
    -type f \
    -not -exec test -s '{}' \; \
    -delete
done

trigger_mirror_refreshs