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#!/bin/sh

# do some basic sanity checks

# shellcheck disable=SC2119,SC2120

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

# TODO: remove hard-coded package suffixes

usage() {
  >&2 echo ''
  >&2 echo 'sanity-check [options] [checks]: check sanity of build master'
  >&2 echo ''
  >&2 echo 'possible options:'
  >&2 echo '  -h|--help:             Show this help and exit.'
  >&2 echo '  -q|--quiet:            Only print errors found.'
  >&2 echo '  -r|--really-quiet:     Do not print anything.'
  >&2 echo '  -w|--wait:             If necessary, wait for lock blocking.'
  [ -z "$1" ] && exit 1 || exit "$1"
}

exit_code=0

i_am_insane() {
  if [ ! -s "${work_dir}/build-master-sanity" ]; then
    # shellcheck disable=SC2119
    printf '\001ACTION goes insane.\001\n' | \
      irc_say
  fi
  echo 'build master is insane' > \
    "${work_dir}/build-master-sanity"
  echo 'SANITY CHECK FAILED' | \
    tee -a "${tmp_dir}/messages" >&2
  exit_code=1
}

eval set -- "$(
  getopt -o hqrw \
    --long help \
    --long quiet \
    --long really-quiet \
    --long wait \
    -n "$(basename "$0")" -- "$@" || \
  echo usage
)"

block_flag='-n'
silence=0
# shellcheck disable=SC2016
repos=$(
  {
    printf 'SELECT DISTINCT `repositories`.`name`'
    printf ' FROM `repositories`'
    printf ' WHERE `repositories`.`is_on_master_mirror`;\n'
  } | \
    mysql_run_query
)
# shellcheck disable=SC2016
archs=$(
  {
    printf 'SELECT DISTINCT `architectures`.`name`'
    printf ' FROM `architectures`'
    printf ' WHERE EXISTS ('
      printf 'SELECT 1'
      printf ' FROM `repositories`'
      printf ' WHERE `repositories`.`architecture`=`architectures`.`id`'
      printf ' AND `repositories`.`is_on_master_mirror`'
    printf ');\n'
  } | \
    mysql_run_query
)

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

exec 9> "${sanity_check_lock_file}"
if ! verbose_flock ${block_flag} 9; then
  >&2 echo 'Sanity check skipped, cannot acquire lock.'
  exit
fi

mysql_cleanup

finish() {
  {
    printf '%s\n' \
      '<html>' \
      '<head>' \
      '<title>result of archlinux32 build master'"'"'s sanity check</title>' \
      '</head>' \
      '<body>'
    printf '%s<br>\n' "$(date)"
    sed 's|$|<br>|' "${tmp_dir}/messages"
    printf '%s\n' \
      '</body>' \
      '</html>'
  } > \
    "${webserver_directory}/master-sanity.html"
  rm -rf --one-file-system "${tmp_dir}"
}

tmp_dir=$(mktemp -d 'tmp.sanity-check.XXXXXXXXXX' --tmpdir)
touch "${tmp_dir}/messages"
trap 'finish' EXIT

if [ $# -eq 0 ]; then
  set -- git-repositories build-list mysql ssh-keys master-mirror-availability repos package-database track-state
fi

while [ $# -gt 0 ]; do

  case "$1" in

    master-mirror-availability)

      [ ${silence} -gt 0 ] || \
        printf 'checking if master mirror can be reached ...' | \
        tee -a "${tmp_dir}/messages" >&2

      for host in $(
        printf '%s\n' \
          "${master_mirror_sftp_command}" \
          "${master_mirror_rsync_directory}" | \
          sed '
            s,^.*@\([^:/@]\+\)\([:/].*\)\?$,\1,
            t
            d
          ' | \
          sort -u
      ); do
        if ! ping -c1 "${host}" >/dev/null 2>&1; then
          if [ ${silence} -le 1 ]; then
            printf '\nThe master mirror %s cannot be pinged.\n' \
              "${host}" | \
              tee -a "${tmp_dir}/messages" >&2
          fi
          i_am_insane
          # if the master mirror cannot be reached, further tests do not make any sense
          set --
        fi
      done

      if ! ${master_mirror_rsync_command} ${master_mirror_rsync_directory} >/dev/null 2>&1; then
        if [ ${silence} -le 1 ]; then
          printf '\nThe master mirror %s cannot be reached via rsync.\n' \
            "${host}" | \
            tee -a "${tmp_dir}/messages" >&2
        fi
        i_am_insane
        # if the master mirror cannot be reached, further tests do not make any sense
        set --
      fi

      if ! ${master_mirror_sftp_command} </dev/null >/dev/null 2>&1; then
        if [ ${silence} -le 1 ]; then
          printf '\nThe master mirror %s cannot be reached via sftp.\n' \
            "${host}" | \
            tee -a "${tmp_dir}/messages" >&2
        fi
        i_am_insane
        # if the master mirror cannot be reached, further tests do not make any sense
        set --
      fi

      [ ${silence} -gt 0 ] || \
        echo ' passed.' | \
        tee -a "${tmp_dir}/messages" >&2

    ;;

    git-repositories)

      [ ${silence} -gt 0 ] || \
        printf 'checking git repositories ...' | \
        tee -a "${tmp_dir}/messages" >&2

      for repo in ${repo_names}; do
        eval 'repo_path="${repo_paths__'"${repo}"'}"'
        repo_revision=$(
          # shellcheck disable=SC2016
          {
            printf 'SELECT `git_repositories`.`head`'
            printf ' FROM `git_repositories`'
            printf ' WHERE `git_repositories`.`name`=from_base64("%s");\n' \
              "$(printf '%s' "${repo}" | base64 -w0)"
          } | \
            mysql_run_query
        )
        if ! obj_type=$(git -C "${repo_path}" cat-file -t "${repo_revision}" 2>/dev/null); then
          if [ ${silence} -le 1 ]; then
            printf '\nThe repository %s (%s) does not know the current revision %s.\n' \
              "${repo}" "${repo_path}" "${repo_revision}" | \
              tee -a "${tmp_dir}/messages" >&2
          fi
          i_am_insane
        elif [ "${obj_type}" != 'commit' ]; then
          if [ ${silence} -le 1 ]; then
            printf '\nThe repository %s (%s) knows the current revision %s, but it is not a commit, but a %s.\n' \
              "${repo}" "${repo_path}" "${repo_revision}" "${obj_type}" | \
              tee -a "${tmp_dir}/messages" >&2
          fi
          i_am_insane
        fi
      done

      [ ${silence} -gt 0 ] || \
        echo ' passed.' | \
        tee -a "${tmp_dir}/messages" >&2

    ;;

    build-list)

      [ ${silence} -gt 0 ] || \
        printf 'checking build-list ...' | \
        tee -a "${tmp_dir}/messages" >&2

      errors=$(
        # shellcheck disable=SC2016
        {
          printf 'SELECT `architectures`.`name`,`package_sources`.`pkgbase`'
          printf ' FROM `package_sources`'
          mysql_join_package_sources_build_assignments
          mysql_join_build_assignments_architectures
          printf ' WHERE EXISTS('
            printf 'SELECT 1'
            printf ' FROM `binary_packages`'
            mysql_join_binary_packages_binary_packages_in_repositories
            printf ' WHERE `binary_packages_in_repositories`.`repository`=%s' \
              "${repository_ids__any_build_list}"
            printf ' AND `binary_packages`.`build_assignment`=`build_assignments`.`id`'
          printf ');\n'
        } | \
          mysql_run_query | \
          sort | \
          uniq -d
      )
      if [ -n "${errors}" ]; then
        if [ ${silence} -le 1 ]; then
          printf '\nThe following packages have duplicate build orders:\n%s\n' \
            "${errors}" | \
            tee -a "${tmp_dir}/messages" >&2
        fi
        i_am_insane
      fi

      errors=$(
        # shellcheck disable=SC2016
        {
          printf 'SELECT `a`.`pkgname`'
          printf ' FROM `binary_packages` AS `a`'
          mysql_join_binary_packages_binary_packages_in_repositories 'a' 'air'
          mysql_join_binary_packages_in_repositories_repositories 'air' 'a_r'
          printf ' AND `a_r`.`name`="build-list"'
          printf ' JOIN `binary_packages` AS `b`'
          printf ' ON `a`.`pkgname`=`b`.`pkgname`'
          printf ' JOIN `architecture_compatibilities` AS `ac_a`'
          printf ' ON `ac_a`.`fully_compatible`'
          printf ' AND `ac_a`.`built_for`=`a`.`architecture`'
          printf ' JOIN `architecture_compatibilities` AS `ac_b`'
          printf ' ON `ac_b`.`fully_compatible`'
          printf ' AND `ac_b`.`built_for`=`b`.`architecture`'
          printf ' AND `ac_a`.`runs_on`=`ac_b`.`runs_on`'
          mysql_join_binary_packages_binary_packages_in_repositories 'b' 'bir'
          mysql_join_binary_packages_in_repositories_repositories 'bir' 'b_r'
          printf ' AND `b_r`.`name`="deletion-list";\n'
        } | \
          mysql_run_query
      )
      if [ -n "${errors}" ]; then
        if [ ${silence} -le 1 ]; then
          printf '\nThe following packages appear on the build- and deletion-list:\n%s\n' \
            "${errors}" | \
            tee -a "${tmp_dir}/messages" >&2
        fi
        i_am_insane
      fi

      [ ${silence} -gt 0 ] || \
        echo ' passed.' | \
        tee -a "${tmp_dir}/messages" >&2

    ;;

    repos)

      [ ${silence} -gt 0 ] || \
        printf 'checking repos on master mirror ...' | \
        tee -a "${tmp_dir}/messages" >&2

      errors=$(
        {
          # shellcheck disable=SC2086
          for arch in ${archs}; do
            printf 'expected '"${arch}"' %s\n' ${repos}
            ls_master_mirror "${arch}" | \
              sed 's|^|found '"${arch}"' |'
          done
        } | \
          sort -k2,3 | \
          uniq -uf1
      )
      if [ -n "${errors}" ]; then
        if [ ${silence} -le 1 ]; then
          printf '\nThe following repos are missing or obsolete on the mirror:\n%s\n' \
            "${errors}" | \
            tee -a "${tmp_dir}/messages" >&2
        fi
        i_am_insane
      fi

      [ ${silence} -gt 0 ] || \
        echo ' passed.' | \
        tee -a "${tmp_dir}/messages" >&2

    ;;

    package-database)

      for arch in ${archs}; do
        for repo in ${repos}; do

          [ ${silence} -gt 0 ] || \
            printf 'checking consistency of repository "%s/%s" on the master mirror ...' "${arch}" "${repo}" | \
            tee -a "${tmp_dir}/messages" >&2

          packages=$(
            ls_master_mirror "${arch}/${repo}" | \
              grep '\.pkg\.tar\.xz\(\.sig\)\?$'
          ) || true

          errors=$(
            echo "${packages}" | \
              grep '\S' | \
              sed '
                s|^\(.*\.pkg\.tar\.xz\)$|package \1|
                s|^\(.*\.pkg\.tar\.xz\)\.sig$|signature \1|
              ' | \
              sort -k2 | \
              uniq -cf1 | \
              grep -v '^\s*2\s' | \
              awk '{print $2 " " $3}'
          ) || true
          if [ -n "${errors}" ]; then
            if [ ${silence} -le 1 ]; then
              printf '\nThe following packages in %s are missing a signature or vice versa:\n%s\n' \
                "${repo}" \
                "${errors}" | \
                tee -a "${tmp_dir}/messages" >&2
            fi
            i_am_insane
          fi

          failsafe_rsync \
            "${master_mirror_rsync_directory}/${arch}/${repo}/${repo}.db.tar.gz" \
            "${master_mirror_rsync_directory}/${arch}/${repo}/${repo}.files.tar.gz" \
            "${tmp_dir}/"

          errors=$(
            {
              tar -Oxzf "${tmp_dir}/${repo}.db.tar.gz" --wildcards '*/desc' 2>/dev/null | \
                sed -n '
                  /^%FILENAME%$/ {
                    N
                    s/^.*\n/in_database /
                    p
                  }
                '
              echo "${packages}" | \
                sed '
                  /\.pkg\.tar\.xz$/ !d
                  s/^/in_repository /
                ' | \
                sort -u
            } | \
              sort -k2 | \
              uniq -uf1
          )
          if [ -n "${errors}" ]; then
            if [ ${silence} -le 1 ]; then
              printf '\nThe following packages in %s are missing from the database or vice versa:\n%s\n' \
                "${repo}" \
                "${errors}" | \
                tee -a "${tmp_dir}/messages" >&2
            fi
            i_am_insane
          fi

          errors=$(
            {
              tar -tzf "${tmp_dir}/${repo}.files.tar.gz" 2>/dev/null | \
                grep '/$' | \
                sed '
                  s|/$||
                  s|^|in_database |
                '
              echo "${packages}" | \
                grep '\S' | \
                sed '
                  s|-[^-]\+$||
                  s|^|in_repository |
                ' | \
                sort -u
            } | \
              sort -k2 | \
              uniq -uf1
          )
          if [ -n "${errors}" ]; then
            if [ ${silence} -le 1 ]; then
              printf '\nThe following packages in %s are missing from the file-database or vice versa:\n%s\n' \
                "${repo}" \
                "${errors}" | \
                tee -a "${tmp_dir}/messages" >&2
            fi
            i_am_insane
          fi

          find "${tmp_dir:?}" -mindepth 1 \( -not -name 'messages' \) -delete

          [ ${silence} -gt 0 ] || \
            echo ' passed.' | \
            tee -a "${tmp_dir}/messages" >&2

        done
      done

    ;;

    track-state)

      [ ${silence} -gt 0 ] || \
        printf 'checking if all packages are tracked correctly ...' | \
        tee -a "${tmp_dir}/messages" >&2

      errors=$(
        {
          # shellcheck disable=SC2016
          {
            printf 'SELECT "mysql",CONCAT(`r_a`.`name`,"/",`repositories`.`name`,"/",'
            mysql_package_name_query
            printf ') FROM `binary_packages`'
            mysql_join_binary_packages_binary_packages_in_repositories
            mysql_join_binary_packages_in_repositories_repositories
            printf ' AND `repositories`.`is_on_master_mirror`'
            mysql_join_binary_packages_architectures
            printf ' LEFT'
            mysql_join_binary_packages_compressions
            mysql_join_repositories_architectures '' 'r_a'
          } | \
            mysql_run_query | \
            tr '\t' ' '
          for arch in ${archs}; do
            ls_master_mirror "${arch}" | \
              while read -r repo; do
                ls_master_mirror "${arch}/${repo}" | \
                  sed '
                    /\.pkg\.tar\.xz$/!d
                    s,^,package-file '"${arch}"'/'"${repo}"'/,
                  '
              done
          done
        } | \
          sort -k2 | \
          uniq -uf1
      )
      if [ -n "${errors}" ]; then
        if [ ${silence} -le 1 ]; then
          printf '\nThe following packages from the master mirror are not tracked in the database or vice versa:\n%s\n' \
            "${errors}" | \
            tee -a "${tmp_dir}/messages" >&2
        fi
        i_am_insane
      fi

      [ ${silence} -gt 0 ] || \
        echo ' passed.' | \
        tee -a "${tmp_dir}/messages" >&2

    ;;

    mysql)

      [ ${silence} -gt 0 ] || \
        printf 'checking mysql-sanity ...' | \
        tee -a "${tmp_dir}/messages" >&2

      mysql_sanity_check | \
        sed '
          s,^-.*$,<font color="#FF0000">\0</font>,
          s,^+.*$,<font color="#00FF00">\0</font>,
          s/$/<br>/
          1 i <html><head><title>sanity of the buildmaster'"'"'s mysql database</title></head><body>
          $ a </body></html>
        ' | \
        sponge "${webserver_directory}/mysql-sanity.html"

      if [ -s "${webserver_directory}/mysql-sanity.html" ] && \
        [ ! -s "${work_dir}/build-master-sanity" ]; then
        # shellcheck disable=SC2119
        {
          printf 'girls, my database is dirty again ...\n'
          printf 'dirty! girls, my database - so dirty :-(\n'
          printf 'girls, please have a look at my dirty database'
        } | \
          shuf -n1 | \
          irc_say
      fi

      if [ -s "${webserver_directory}/mysql-sanity.html" ]; then
        if [ ${silence} -le 1 ]; then
          printf '\nThere is something wrong with the database:\n'
          cat "${webserver_directory}/mysql-sanity.html"
        fi | \
          tee -a "${tmp_dir}/messages" >&2
        i_am_insane
      fi

      # hopefully, this gets rid of false positives :-)
      sleep 1

      errors=$(
        find "${work_dir}" -mindepth 1 -maxdepth 1 \
          -not -name 'tmp.mysql-functions.unimportant_query.*' \
          -name 'tmp.mysql-functions.query.*' | \
          parallel -j100 \
            'bash -c "
              sleep 5
              test -s {} && '\
                'printf '"'"'%s:\n'"'"' {} && '\
                'sed '"'"'s/^/>> /'"'"' {}
            "'
      ) || \
        true
      if [ -n "${errors}" ]; then
        if [ ${silence} -le 1 ]; then
          printf '\nThere are pending mysql queries:\n%s\n' \
            "${errors}"
        fi | \
          tee -a "${tmp_dir}/messages" >&2
        i_am_insane
      fi

      [ ${silence} -gt 0 ] || \
        echo ' passed.' | \
        tee -a "${tmp_dir}/messages" >&2

    ;;

    ssh-keys)

      [ ${silence} -gt 0 ] || \
        printf 'checking ssh-keys ...' | \
        tee -a "${tmp_dir}/messages" >&2

      # shellcheck disable=SC2016
      {
        printf 'SELECT'
        printf ' CONCAT('
          printf '"command=\\\"%s/bin/slave-build-connect ",' \
            "${base_dir}"
          printf '`build_slaves`.`name`,'
          printf '"\\\" ssh-rsa ",'
          printf '`ssh_keys`.`fingerprint`'
        printf ')'
        printf ' FROM'
        printf ' `build_slaves`'
        mysql_join_build_slaves_ssh_keys
        printf ' WHERE `build_slaves`.`access_allowed`'
      } | \
        mysql_run_query | \
        sort > \
        "${tmp_dir}/ssh-keys.mysql"
      sed -n '
        /^command/ {
          s/^\(\(\S\+\s\+\)\{4\}\)\S.*$/\1/
          s/\s\+$//
          p
        }
      ' ~/".ssh/authorized_keys" | \
        sort > \
        "${tmp_dir}/ssh-keys.authorized_keys"

      errors=$(
        diff "${tmp_dir}/ssh-keys.mysql" "${tmp_dir}/ssh-keys.authorized_keys"
      ) || true
      if [ -n "${errors}" ]; then
        if [ ${silence} -le 1 ]; then
          printf '\nThe ssh keys in the database and the file system differ:\n%s\n' \
            "${errors}"
        fi | \
          tee -a "${tmp_dir}/messages" >&2
        i_am_insane
      fi

      [ ${silence} -gt 0 ] || \
        echo ' passed.' | \
        tee -a "${tmp_dir}/messages" >&2

    ;;

    *)

      [ ${silence} -gt 1 ] || \
        >&2 printf 'unknown sanity-check "%s".\n' "$1"
      exit 2

    ;;

  esac

  shift

done

if [ ${exit_code} -ne 0 ]; then
  exit ${exit_code}
fi

if [ -f "${work_dir}/build-master-sanity" ]; then
  rm "${work_dir}/build-master-sanity"
  # shellcheck disable=SC2119
  printf '\001ACTION resumes sanity.\001\n' | \
    irc_say
fi