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#!/bin/sh

# usage: why_dont_you $action $package1 $package2 ...

# shellcheck disable=SC2119,SC2120

# investigate, why a certain operation is not done with certain packages

# shellcheck source=../lib/load-configuration
. "${0%/*}/../lib/load-configuration"

# TODO: reintrocude "keep", "stubbornly_keep", "stabilize" and "unstage"
# using information from the database.

action="$1"
shift

tmp_dir=$(mktemp -d 'tmp.why-dont-you.XXXXXXXXXX' --tmpdir)
trap 'rm -rf --one-file-system "${tmp_dir}"' EXIT

case "${action}" in

  'build')

    # shellcheck disable=SC2016
    {
      printf 'CREATE TEMPORARY TABLE `pkgbases` (`pkgbase` VARCHAR(64));\n'
      printf 'INSERT INTO `pkgbases` VALUES '
      # shellcheck disable=SC2046
      printf '(from_base64("%s")),' \
        $(
          printf '%s\n' "$@" | \
            base64_encode_each
        ) | \
        sed 's/,$/;\n/'
      # we select everything which is possibly of any interest:
      # - id (to see if it actually is on the build-list
      # - to_build.is_broken
      # - failed_builds_count
      # - to_build.is_blocked
      # - deps.pkgbase (any dependency pending?)
      # - build_slaves.name (is anyone building this?)
      # - pkgbase
      printf 'SELECT DISTINCT `to_build`.`ba_id`,'
      printf 'If(`to_build`.`is_broken`,1,0),'
      printf '('
        printf 'SELECT COUNT(1) FROM `failed_builds`'
        printf 'WHERE `failed_builds`.`build_assignment`=`to_build`.`ba_id`'
      printf ')'
      printf ',replace(to_base64(`%s`.`%s`),"\\n","")' \
        'to_build' 'is_blocked' \
        'deps' 'pkgbase' \
        'build_slaves' 'name' \
        'pkgbases' 'pkgbase'
      # at least one row for each given `pkgbase`
      printf ' FROM `pkgbases`'
      printf ' LEFT JOIN '
        printf '('
        # join the tables for the to-be-built packages:
        # package_source, build_assignment, binary_package, repostory
        printf 'SELECT DISTINCT `tb_ps`.`pkgbase`,`tb_bin`.`id` AS `bin_id`,`tb_ba`.`id` AS `ba_id`,`tb_ba`.`is_blocked`,`tb_ba`.`is_broken`'
        printf ' FROM `package_sources` AS `tb_ps`'
        mysql_join_package_sources_build_assignments 'tb_ps' 'tb_ba'
        mysql_join_build_assignments_binary_packages 'tb_ba' 'tb_bin'
        mysql_join_binary_packages_binary_packages_in_repositories 'tb_bin' 'tb_bir'
        mysql_join_binary_packages_in_repositories_repositories 'tb_bir' 'tb_rep'
        printf ' WHERE `tb_rep`.`name`="build-list"'
        printf ') AS `to_build`'
      printf ' ON `to_build`.`pkgbase`=`pkgbases`.`pkgbase`'
      printf ' LEFT JOIN '
        printf '('
        # same join as above, but with different names - for the
        # potential dependencies
        printf 'SELECT DISTINCT `dep_ps`.`pkgbase`,`dependencies`.`dependent`'
        printf ' FROM `package_sources` AS `dep_ps`'
        mysql_join_package_sources_build_assignments 'dep_ps' 'dep_ba'
        mysql_join_build_assignments_binary_packages 'dep_ba' 'dep_bin'
        mysql_join_binary_packages_binary_packages_in_repositories 'dep_bin' 'dep_bir'
        mysql_join_binary_packages_in_repositories_repositories 'dep_bir' 'dep_rep'
        # now we have some (=3) additional joins,
        # because we are interested in dependency relations to `to_build`
        mysql_join_binary_packages_install_target_providers 'dep_bin'
        mysql_join_install_target_providers_dependencies
        mysql_join_dependencies_dependency_types
        printf ' WHERE `dep_rep`.`name`="build-list"'
        printf ' AND `dependency_types`.`relevant_for_building`'
        printf ') AS `deps`'
      printf ' ON `deps`.`dependent`=`to_build`.`bin_id`'
      # now we join with build slaves to see if someone builds this
      printf ' LEFT JOIN `build_slaves` ON `build_slaves`.`currently_building`=`to_build`.`ba_id`'
      printf ';\n'
    } | \
      mysql_run_query | \
      tr '\t' ' ' | \
      sort -k7,7 -k6,6 -k5,5 | \
      sed '
        / NULL \S\+$/ b multi-dep
        :multi-slave
          $!N
          s/^\(\(\S\+ \)\{5\}\)\(\S\+\)\( \S\+\)\n\(\S\+ \)\{5\}\(\S\+\)\4/\1\3,\6\4/
          t multi-slave
          P
          D
        :multi-dep
          / NULL\( \S\+\)\{3\}$/! b
          $!N
          s/^\(\(\S\+ \)\{4\}\)\(\S\+\)\(\( \S\+\)\{2\}\)\n\(\S\+ \)\{4\}\(\S\+\)\4/\1\3,\7\4/
          t multi-dep
          P
          D
      ' | \
      sed '
        s/NULL,//g
      ' | \
      while read -r id is_broken trials is_blocked dependency slave pkgbase; do
        pkgbase=$(
          printf '%s' "${pkgbase}" | \
            base64 -d
        )
        if [ "${id}" = 'NULL' ]; then
          >&2 printf '"%s" is not on the build list.\n' \
            "${pkgbase}"
          continue
        fi
        if [ "${slave}" != 'NULL' ]; then
          # beware: A slave named "5BË" will look exactly like this!
          printf '"%s" is locked by %s.\n' \
            "${pkgbase}" \
            "$(
              printf '%s\n' "${slave}" | \
                tr ',' '\n' | \
                while read -r line; do
                  printf '%s\n' "${line}" | \
                    base64 -d
                  printf ','
                done | \
                sed 's/,$//'
            )"
          continue
        fi
        if [ "${is_blocked}" != 'NULL' ]; then
          # beware: A block-reason "5BË" will look exactly like this!
          printf '"%s" is blocked: "%s".\n' \
            "${pkgbase}" \
            "$(
              printf '%s' "${is_blocked}" | \
                base64 -d
            )"
          continue
        fi
        if [ "${dependency}" != 'NULL' ]; then
          printf '"%s" has unmet dependencies:\n' \
            "${pkgbase}"
          printf '%s\n' "${dependency}" | \
            tr ',' '\n' | \
            while read -r line; do
              printf '  '
              printf '%s\n' "${line}" | \
                base64 -d
              printf '\n'
            done
          continue
        fi
        if [ "${is_broken}" = '1' ]; then
          printf '"%s" is broken (%sx built), but would be built.\n' \
            "${pkgbase}" \
            "${trials}"
          continue
        fi
        printf '"%s" would be built.\n' \
          "${pkgbase}"
      done

  ;;

  'stabilize'|'unstage')

    if [ "${action}" = 'stabilize' ]; then
      # shellcheck disable=SC2154
      from_stability=${repository_stability_ids__testing}
      # shellcheck disable=SC2016
      test_filter='`binary_packages`.`is_tested`'
    else
      # shellcheck disable=SC2154
      from_stability=${repository_stability_ids__staging}
      test_filter='1'
    fi

    for pkgname in "$@"; do
      infos=$(
        # shellcheck disable=SC2016
        {
          printf 'SELECT'
          printf ' `binary_packages_in_repositories`.`id`,'
          printf ' IF(%s,1,0),' "${test_filter}"
          printf ' IF(`binary_packages`.`has_issues`,1,0)'
          printf ' FROM `binary_packages_in_repositories`'
          mysql_join_binary_packages_in_repositories_repositories
          mysql_join_binary_packages_in_repositories_binary_packages
          printf ' WHERE `repositories`.`stability`=%s' \
            "${from_stability}"
          printf ' AND `binary_packages`.`pkgname`=from_base64("%s")' \
            "$(
              printf '%s' "${pkgname}" | \
                base64 -w0
            )"
        } | \
          mysql_run_query | \
          tr '\t' ' '
      )
      if [ -z "${infos}" ]; then
        printf 'Cannot find "%s"\n' \
          "${pkgname}"
        continue
      fi
      # bpir="${infos%% *}"
      infos="${infos#* }"
      if [ "${infos% *}" = '0' ]; then
        printf '"%s" is not tested.\n' \
          "${pkgname}"
        continue
      fi
      infos="${infos#* }"
      if [ "${infos}" = '1' ]; then
        printf 'There are unresolved bugs reported against "%s".\n' \
          "${pkgname}"
        continue
      fi

      # TODO: `calculate_maximal_moveable_set` should return a list of
      # `links` between binary_packages_in_repositories, which should
      # then be evaluated here

      printf '"%s" might be %sd (but evaluation of that is not yet completely implemented!).\n' \
        "${pkgname}" \
        "${action}"
    done

  ;;

  'keep'|'stubbornly_keep')

    printf 'Sry, "why-dont-you %s" is unavailable, until someone recodes it to look into the database.\n' "${action}"

  ;;

  *)
    >&2 printf 'unknown action "%s"\n' "${action}"
    exit 1

esac