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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 `searches` (`search` VARCHAR(64));\n'
      printf 'INSERT INTO `searches` VALUES '
      # shellcheck disable=SC2046
      printf '(from_base64("%s")),' \
        $(
          printf '%s\n' "$@" | \
            base64_encode_each
        ) | \
        sed 's/,$/;\n/'
      # we select everything which is possibly of any interest:
      # - search term
      # - id (to see if it actually is on the build-list)
      # - build_assignments.architecture.name
      # - to_build.is_broken
      # - failed_builds_count
      # - to_build.is_blocked
      # - deps.pkgbase (any dependency pending?)
      # - build_slaves.name (is anyone building this?)
      # - pkgbase
      printf 'SELECT DISTINCT replace(to_base64(`searches`.`search`),"\\n",""),'
      printf '`to_build`.`ba_id`,'
      printf '`to_build`.`baa_name`,'
      printf 'If(`to_build`.`is_broken`,1,0),'
      printf '('
        printf 'SELECT COUNT(1)'
        printf ' FROM `failed_builds`'
        printf 'WHERE `failed_builds`.`build_assignment`=`to_build`.`ba_id`'
      printf ')'
      printf ',replace(to_base64(`%s`.`%s`),"\\n","")' \
        'to_build' 'is_blocked' \
        'deps' 'pkgbase' \
        'build_slaves' 'name' \
        'to_build' 'pkgbase'
      # at least one row for each given `search`
      printf ' FROM `searches`'
      printf ' LEFT JOIN '
        printf '('
        # join the tables for the to-be-built packages:
        # package_source, build_assignment, binary_package, repostory
        printf 'SELECT DISTINCT '
        printf '`tb_ps`.`pkgbase`,'
        printf '`tb_bin`.`id` AS `bin_id`,'
        printf '`tb_ba`.`id` AS `ba_id`,'
        printf '`tb_ba`.`is_blocked`,'
        printf '`tb_ba`.`is_broken`,'
        printf '`tb_baa`.`name` AS `baa_name`'
        printf ' FROM `package_sources` AS `tb_ps`'
        mysql_join_package_sources_build_assignments 'tb_ps' 'tb_ba'
        mysql_join_build_assignments_architectures 'tb_ba' 'tb_baa'
        mysql_join_build_assignments_binary_packages 'tb_ba' 'tb_bin'
        mysql_join_binary_packages_binary_packages_in_repositories 'tb_bin' 'tb_bir'
        printf ' WHERE `tb_bir`.`repository`=%s' \
          "${repository_ids__any_build_list}"
        printf ') AS `to_build`'
      printf ' ON ('
        printf '`to_build`.`pkgbase`=`searches`.`search`'
        printf ' OR `searches`.`search`=CONCAT(`to_build`.`baa_name`,"/",`to_build`.`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'
        # 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_with_versions
        mysql_join_dependencies_dependency_types
        printf ' WHERE `dep_bir`.`repository`=%s' \
          "${repository_ids__any_build_list}"
        printf ' AND `dependency_types`.`relevant_for_building`'
        printf ') AS `deps`'
      printf ' ON `deps`.`dependent`=`to_build`.`bin_id`'
      # now we join with build slaves to see if someone builds this
      printf ' LEFT JOIN `build_slaves`'
      printf ' ON `build_slaves`.`currently_building`=`to_build`.`ba_id`'
      printf ';\n'
    } | \
      mysql_run_query 'unimportant' | \
      tr '\t' ' ' | \
      sort -k9,9 -k8,8 -k7,7 | \
      sed '
        / NULL \S\+$/ b multi-dep
        :multi-slave
          $!N
          s/^\(\(\S\+ \)\{6\}\)\(\S\+\)\( \S\+\)\n\(\S\+ \)\{6\}\(\S\+\)\4/\1\3,\6\4/
          t multi-slave
          P
          D
        :multi-dep
          / NULL\( \S\+\)\{3\}$/! b
          $!N
          s/^\(\(\S\+ \)\{5\}\)\(\S\+\)\(\( \S\+\)\{2\}\)\n\(\S\+ \)\{5\}\(\S\+\)\4/\1\3,\7\4/
          t multi-dep
          P
          D
      ' | \
      sed '
        s/NULL,//g
      ' | \
      while read -r search id ba_arch is_broken trials is_blocked dependency slave pkgbase; do
        search=$(
          printf '%s' "${search}" | \
            base64 -d
        )
        pkgbase=$(
          printf '%s' "${pkgbase}" | \
            base64 -d
        )
        if [ "${id}" = 'NULL' ]; then
          >&2 printf '"%s" is not on the build list.\n' \
            "${search}"
          continue
        fi
        if [ "${slave}" != 'NULL' ]; then
          # beware: A slave named "5BË" will look exactly like this!
          printf '"%s/%s" is locked by %s.\n' \
            "${ba_arch}" \
            "${pkgbase}" \
            "$(
              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/%s" is blocked: "%s".\n' \
            "${ba_arch}" \
            "${pkgbase}" \
            "$(
              printf '%s' "${is_blocked}" | \
                base64 -d
            )"
          continue
        fi
        if [ "${dependency}" != 'NULL' ]; then
          printf '"%s/%s" has unmet dependencies:\n' \
            "${ba_arch}" \
            "${pkgbase}"
          printf '%s\n' "${dependency}" | \
            tr ',' '\n' | \
            while read -r line; do
              printf '  '
              printf '%s\n' "${line}" | \
                base64 -d
              printf '\n'
            done | \
            sort -u
          continue
        fi
        if [ "${is_broken}" = '1' ]; then
          printf '"%s/%s" is broken (%sx built), but would be built.\n' \
            "${ba_arch}" \
            "${pkgbase}" \
            "${trials}"
          continue
        fi
        printf '"%s/%s" would be built.\n' \
          "${ba_arch}" \
          "${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 "$@"; do
      printf 'Cannot find package "%s"\n' "${pkgname}" \
      > "${tmp_dir}/error"
      # shellcheck disable=SC2016
      {
        printf 'SELECT'
        printf ' `binary_packages_in_repositories`.`id`,'
        printf ' IF(%s,1,0),' "${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_repositories_architectures
        mysql_join_binary_packages_in_repositories_binary_packages
        printf ' WHERE `repositories`.`stability`=%s' \
          "${from_stability}"
        printf ' AND ('
          printf '`binary_packages`.`pkgname`=from_base64("%s")' \
            "$(
              printf '%s' "${pkgname}" | \
                base64 -w0
            )"
          printf 'OR CONCAT('
            printf '`architectures`.`name`,"/",'
            printf '`binary_packages`.`pkgname`'
          printf ')=from_base64("%s")' \
            "$(
              printf '%s' "${pkgname}" | \
                base64 -w0
            )"
        printf ');\n'
      } \
      | mysql_run_query 'unimportant' \
      | while read -r bpir tested issues; do
        rm -f "${tmp_dir}/error"
        if [ "${tested}" = '0' ]; then
          printf '"%s" is not tested.\n' \
            "${pkgname}"
          continue
        fi
        if [ "${issues}" = '1' ]; then
          printf 'There are unresolved bugs reported against "%s".\n' \
            "${pkgname}"
          continue
        fi
        printf '%s\n' "${bpir}" \
        >> "${tmp_dir}/packages"
      done
      if [ -s "${tmp_dir}/error" ]; then
        cat "${tmp_dir}/error"
      fi
    done

    if [ ! -s "${tmp_dir}/packages" ]; then
      exit
    fi

    # shellcheck disable=SC2016
    {
      for copy in '' '_2'; do
        printf 'CREATE TEMPORARY TABLE `bpirs%s` (' \
          "${copy}"
          printf '`id` BIGINT,'
          printf 'UNIQUE KEY `id`(`id`)'
        printf ');\n'
      done
      printf 'LOAD DATA LOCAL INFILE "%s" INTO TABLE `bpirs`;\n' \
        "${tmp_dir}/packages"
      printf 'INSERT INTO `bpirs_2`(`id`)'
      printf ' SELECT '
      printf '`bpirs`.`id`'
      printf ' FROM `bpirs`;\n'

      printf 'SELECT CONCAT('
        printf '"\\"",'
        printf '`sub_q`.`label`,'
        printf '"\\" is glued to ",'
        printf 'GROUP_CONCAT('
          printf 'CONCAT('
            printf '"\\"",'
            printf '`sub_q`.`name`,'
            printf '"\\""'
          printf ')'
        printf '),'
        printf '" which must be moved simultanously"'
      printf ') FROM ('
        printf 'SELECT DISTINCT '
        printf 'CONCAT(`architectures`.`name`,"/",`b_bp`.`pkgname`) AS `name`,'
        printf '`bpirs`.`id`,'
        printf 'CONCAT(`architectures`.`name`,"/",`binary_packages`.`pkgname`) AS `label`'
        printf ' FROM `bpirs`'
        printf ' JOIN `binary_packages_in_repositories`'
        printf ' ON `binary_packages_in_repositories`.`id`=`bpirs`.`id`'
        mysql_join_binary_packages_in_repositories_repositories
        mysql_join_repositories_architectures
        mysql_join_binary_packages_in_repositories_binary_packages
        mysql_join_binary_packages_build_assignments
        mysql_join_build_assignments_package_sources
        printf ' JOIN `package_sources` AS `b_ps`'
        printf ' ON UNIX_TIMESTAMP(`package_sources`.`commit_time`) - UNIX_TIMESTAMP(`b_ps`.`commit_time`) BETWEEN -10 AND 10'
        printf ' AND `package_sources`.`commit_time`!="0000-00-00 00:00:00"'
        printf ' AND `b_ps`.`commit_time`!="0000-00-00 00:00:00"'
        mysql_join_package_sources_build_assignments 'b_ps' 'b_ba'
        mysql_join_build_assignments_binary_packages 'b_ba' 'b_bp'
        mysql_join_binary_packages_binary_packages_in_repositories 'b_bp' 'b_bpir'
        mysql_join_binary_packages_in_repositories_repositories 'b_bpir' 'b_r'
        printf ' AND `b_r`.`architecture`=`repositories`.`architecture`'
        printf ' AND `repositories`.`stability`=`b_r`.`stability`'
        printf ' LEFT JOIN `bpirs_2`'
        printf ' ON `bpirs_2`.`id`=`b_bpir`.`id`'
        printf ' WHERE `bpirs_2`.`id` IS NULL'
      printf ') AS `sub_q`'
      printf ' GROUP BY `sub_q`.`id`;\n'

      printf 'SELECT CONCAT('
        printf '"\\"",'
        printf '`sub_q`.`label`,'
        printf '"\\" depends on ",'
        printf 'GROUP_CONCAT('
          printf 'CONCAT('
            printf '"\\"",'
            printf '`sub_q`.`dependency`,'
            printf '"\\""'
          printf ')'
        printf '),'
        printf '" which must be moved simultanously"'
      printf ') FROM ('
        printf 'SELECT DISTINCT '
        printf 'CONCAT(`architectures`.`name`,"/",`itp_bp`.`pkgname`) AS `dependency`,'
        printf '`bpirs`.`id`,'
        printf 'CONCAT(`architectures`.`name`,"/",`binary_packages`.`pkgname`) AS `label`'
        printf ' FROM `bpirs`'
        printf ' JOIN `binary_packages_in_repositories`'
        printf ' ON `binary_packages_in_repositories`.`id`=`bpirs`.`id`'
        mysql_join_binary_packages_in_repositories_repositories
        mysql_join_repositories_architectures
        mysql_join_binary_packages_in_repositories_binary_packages
        mysql_join_binary_packages_dependencies
        mysql_join_dependencies_dependency_types
        printf ' AND `dependency_types`.`relevant_for_binary_packages`'
        mysql_join_dependencies_install_target_providers_with_versions
        mysql_join_install_target_providers_binary_packages '' 'itp_bp'
        mysql_join_binary_packages_binary_packages_in_repositories 'itp_bp' 'itp_bpir'
        mysql_join_binary_packages_in_repositories_repositories 'itp_bpir' 'itp_r'
        printf ' AND `itp_r`.`architecture`=`repositories`.`architecture`'
        printf ' AND `repositories`.`stability`=`itp_r`.`stability`'
        printf ' LEFT JOIN `bpirs_2`'
        printf ' ON `bpirs_2`.`id`=`itp_bpir`.`id`'
        printf ' WHERE `bpirs_2`.`id` IS NULL'
      printf ') AS `sub_q`'
      printf ' GROUP BY `sub_q`.`id`;\n'

      printf 'SELECT CONCAT('
        printf '"\\"",'
        printf '`sub_q`.`label`,'
        printf '"\\" replaces dependencies of ",'
        printf 'GROUP_CONCAT('
          printf 'CONCAT('
            printf '"\\"",'
            printf '`sub_q`.`dependent`,'
            printf '"\\""'
          printf ')'
        printf '),'
        printf '" which must be replaced simulatanously"'
# TODO: ignore those, that *are* requested to be moved simulatnously!
      printf ') FROM ('
        printf 'SELECT DISTINCT '
        printf 'CONCAT(`architectures`.`name`,"/",`d_bp`.`pkgname`) AS `dependent`,'
        printf '`bpirs`.`id`,'
        printf 'CONCAT(`architectures`.`name`,"/",`binary_packages`.`pkgname`) AS `label`'
        printf ' FROM `bpirs`'
        printf ' JOIN `binary_packages_in_repositories`'
        printf ' ON `binary_packages_in_repositories`.`id`=`bpirs`.`id`'
        mysql_join_binary_packages_in_repositories_repositories
        mysql_join_repositories_architectures
        mysql_join_binary_packages_in_repositories_binary_packages
        printf ' JOIN `binary_packages` AS `r_bp`'
        printf ' ON `binary_packages`.`pkgname`=`r_bp`.`pkgname`'
        mysql_join_binary_packages_binary_packages_in_repositories 'r_bp' 'r_bpir'
        printf ' JOIN `repository_moves`'
        printf ' ON `repository_moves`.`from_repository`=`repositories`.`id`'
        printf ' AND `repository_moves`.`to_repository`=`r_bpir`.`repository`'
        mysql_join_binary_packages_install_target_providers 'r_bp' 'r_itp'
        mysql_join_install_target_providers_dependencies_with_versions 'r_itp'
        mysql_join_dependencies_dependency_types
        printf ' AND `dependency_types`.`relevant_for_binary_packages`'
        mysql_join_dependencies_binary_packages '' 'd_bp'
        mysql_join_binary_packages_binary_packages_in_repositories 'd_bp' 'd_bpir'
        mysql_join_binary_packages_in_repositories_repositories 'd_bpir' 'd_r'
        printf ' AND `d_r`.`architecture`=`repositories`.`architecture`'
        printf ' JOIN `repository_stability_relations`'
        printf ' ON `repository_stability_relations`.`more_stable`=`d_r`.`stability`'
        printf ' AND `repository_stability_relations`.`less_stable`=`repositories`.`stability`'
      printf ') AS `sub_q`'
      printf ' GROUP BY `sub_q`.`id`;\n'
    } \
    | mysql_run_query 'unimportant' \
    | grep -F '' \
    || echo 'This should be a no-brainer.'

  ;;

  '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" - known actions are:' "${action}"
    >&2 printf ' "%s"' \
      'build' \
      'stabilize' \
      'unstage' \
      'keep' \
      'stubbornly_keep'
    >&2 printf '\n'
    exit 1

esac