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#!/bin/sh

# do some basic sanity checks

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

# TODO: read information from database

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|--webserver:        Generate output suitable for webserver.'
  [ -z "$1" ] && exit 1 || exit "$1"
}

i_am_insane() {
  if [ ! -s "${work_dir}/build-master-sanity" ]; then
    printf '\001ACTION goes insane.\001\n' | \
      sponge "${irc_dir}/#archlinux-ports/in"
  fi
  echo 'build master is insane' > \
    "${work_dir}/build-master-sanity"
  echo 'SANITY CHECK FAILED' >> \
    "${tmp_dir}/messages"
  exit 1
}

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

silence=0
repos="${standalone_package_repositories} ${stable_package_repositories} ${testing_package_repositories} ${staging_package_repositories}"
web=false

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

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

finish() {
  if ${web}; then
    {
      printf '%s\n' \
        '<html>' \
        '<head>' \
        '<title>result of archlinux32 build master'"'"'s sanity check</title>' \
        '</head>' \
        '<body>'
      printf '%s<br>\n' "$(date)"
      sed 's|$|<br>|' "${tmp_dir}/messages"
      printf '%s\n' \
        '</body>' \
        '</html>'
    } > \
      "${webserver_directory}/master-sanity.html"
  else
    cat "${tmp_dir}/messages" >&2
  fi
  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 repos package-database state-files
fi

while [ $# -gt 0 ]; do

  case "$1" in

    git-repositories)

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

      for repo in ${repo_names}; do
        eval 'repo_path="${repo_paths__'"${repo}"'}"'
        repo_revision=$(
          cat "${work_dir}/${repo}.revision"
        )
        if ! git -C "${repo_path}" archive "${repo_revision}" -- | \
          tar -t > /dev/null; then
          if [ ${silence} -le 1 ]; then
            printf '\nThe repository %s (%s) cannot archive the current revision %s.\n' \
              "${repo}" "${repo_path}" "${repo_revision}" >> \
              "${tmp_dir}/messages"
          fi
          i_am_insane
        fi
      done

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

    ;;

    build-list)

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

      errors=$(
        grep -vn '^\S\+ [0-9a-f]\{40\} [0-9a-f]\{40\} \S\+$' "${work_dir}/build-list"
      ) || true
      if [ -n "${errors}" ]; then
        if [ ${silence} -le 1 ]; then
          printf '\nThe following build orders are wrongly formatted:\n%s\n' \
            "${errors}" >> \
            "${tmp_dir}/messages"
        fi
        i_am_insane
      fi

      errors=$(
        cut -d' ' -f1 < \
          "${work_dir}/build-list" | \
          sort | \
          uniq -d
      )
      if [ -n "${errors}" ]; then
        if [ ${silence} -le 1 ]; then
          printf '\nThe following packages have duplicate build orders:\n%s\n' \
            "${errors}" >> \
            "${tmp_dir}/messages"
        fi
        i_am_insane
      fi

      errors=$(
        {
          cut -d' ' -f1 < \
            "${work_dir}/build-list"
          cat "${work_dir}/deletion-list"
        } | \
          sort | \
          uniq -d
      )
      if [ -n "${errors}" ]; then
        if [ ${silence} -le 1 ]; then
          printf '\nThe following packages appear on the build- and deletion-list:\n%s\n' \
            "${errors}" >> \
            "${tmp_dir}/messages"
        fi
        i_am_insane
      fi

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

    ;;

    repos)

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

      errors=$(
        {
          # shellcheck disable=SC2086
          printf 'expected %s\n' ${repos}
          ls_master_mirror 'i686' | \
            sed 's|^|found |'
        } | \
          sort -k2 | \
          uniq -uf1
      )
      if [ -n "${errors}" ]; then
        if [ ${silence} -le 1 ]; then
          printf '\nThe following repos are missing or obsolete on the mirror:\n%s\n' \
            "${errors}" >> \
            "${tmp_dir}/messages"
        fi
        i_am_insane
      fi

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

    ;;

    package-database)

      for repo in ${repos}; do

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

        packages=$(
          ls_master_mirror "i686/${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}" \
              "${errors}" >> \
              "${tmp_dir}/messages"
          fi
          i_am_insane
        fi

        ${master_mirror_rsync_command} \
          "${master_mirror_rsync_directory}/i686/${repo}/${repo}.db.tar.gz" \
          "${master_mirror_rsync_directory}/i686/${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}" \
              "${errors}" >> \
              "${tmp_dir}/messages"
          fi
          i_am_insane
        fi

        errors=$(
          {
            tar -tzf "${tmp_dir}/${repo}.files.tar.gz" | \
              grep '/$' | \
              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}" \
              "${errors}" >> \
              "${tmp_dir}/messages"
          fi
          i_am_insane
        fi

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

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

      done

    ;;

    state-files)

      for status in 'staging' 'testing'; do

        [ ${silence} -gt 0 ] || \
          printf 'checking state-files of "%s" ...' "${status}" >> \
          "${tmp_dir}/messages"

        errors=$(
          {
            if [ "${status}" = 'staging' ]; then
              find "${work_dir}/package-states" -name '*.done' \
                -exec sed 's|^|package-state-file |' '{}' \;
            else
              find "${work_dir}/package-states" \( -name '*.testing' -o -name '*.tested' \) \
                -exec sed 's|^|package-state-file |' '{}' \;
            fi
            ls_master_mirror 'i686' | \
              grep "${status}\$" | \
              while read -r repo; do
                ls_master_mirror "i686/${repo}"
              done | \
              grep '\.pkg\.tar\.xz$' | \
              sed 's|^|package-file |'
          } | \
            sort -k2 | \
            uniq -cf1 | \
            grep -v '^\s*2\s' | \
            awk '{print $2 " " $3}'
        )
        if [ -n "${errors}" ]; then
          if [ ${silence} -le 1 ]; then
            printf '\nThe following %s packages do not have state files or vice versa:\n%s\n' \
              "${status}" \
              "${errors}" >> \
              "${tmp_dir}/messages"
          fi
          i_am_insane
        fi

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

      done

    ;;

    mysql)

      [ ${silence} -gt 0 ] || \
        printf 'checking mysql-sanity-check-file ...' >> \
        "${tmp_dir}/messages"

      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 >> \
          "${tmp_dir}/messages"
        i_am_insane
      fi

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

      if find "${work_dir}" -mindepth 1 -maxdepth 1 -name 'tmp.mysql-functions.query.*' | \
        grep '\S' >> \
        "${tmp_dir}/messages"; then
        i_am_insane
      fi

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

    ;;

    *)

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

    ;;

  esac

  shift

done

if [ -f "${work_dir}/build-master-sanity" ]; then
  rm "${work_dir}/build-master-sanity"
  printf '\001ACTION resumes sanity.\001\n' | \
    sponge "${irc_dir}/#archlinux-ports/in"
fi