#!/bin/sh

# contains functions used by more than one script

# shellcheck disable=SC2039,SC2119,SC2120,SC3043

if [ -z "${base_dir}" ]; then
  # just to make shellcheck happy
  . '../lib/load-configuration'
fi

# ls_master_mirror $path
# list content of $path on the master mirror (via rsync)

ls_master_mirror() {

  local path="$1"

  ${master_mirror_rsync_command} \
    "${master_mirror_rsync_directory}/${path}/" | \
    grep -v '\s\.$' | \
    awk '{print $5}' | \
    grep -v build-support-manual

}

# remove_old_package_versions

# removes all older versions of the packages given at stdin (by bpir.id)
# from all repositories less[1] stable than the current repository, as
# well as any different version of the same package from equally[2]
# stable repositories

# 1] determined by `repository_stability_relations`
# 2] identical `repositories`.`stability`

remove_old_package_versions() {

  ( # the new shell is intentional
    tmp_dir=$(mktemp -d 'tmp.common-functions.remove_old_package_versions.XXXXXXXXXX' --tmpdir)
    trap 'rm -rf --one-file-system "${tmp_dir}"' EXIT

    while read -r bpir_id; do

      # shellcheck disable=SC2016
      {
        printf 'SELECT '
        printf '`d_bpir`.`id`,'
        printf 'IF(`d_r`.`stability`=`o_r`.`stability` AND `d_bpir`.`id`!=`o_bpir`.`id`,1,0),'
        printf 'CONCAT('
          printf 'IF(`d_bp`.`epoch`=0,"",CONCAT(`d_bp`.`epoch`,":")),'
          printf '`d_bp`.`pkgver`,"-",'
          printf '`d_bp`.`pkgrel`,'
          printf 'IF(`d_bp`.`sub_pkgrel_omitted`,"",CONCAT(".",`d_bp`.`sub_pkgrel`))'
        printf '),'
        printf 'IF(`d_r`.`id`=`o_r`.`id`,1,0),'
        printf '`d_ra`.`name`,'
        printf '`d_r`.`name`,'
        printf '`d_bp`.`pkgname`,'
        printf 'CONCAT(`d_ra`.`name`,"/",'
        printf '`d_r`.`name`,"/",'
        mysql_package_name_query 'd_bp' 'd_bpa' 'd_bpc'
        printf ')'
        printf ' FROM `binary_packages_in_repositories` AS `d_bpir`'
        mysql_join_binary_packages_in_repositories_binary_packages 'd_bpir' 'd_bp'
        mysql_join_binary_packages_in_repositories_repositories 'd_bpir' 'd_r'
        printf ' AND `d_r`.`is_on_master_mirror`'
        mysql_join_repositories_architectures 'd_r' 'd_ra'
        mysql_join_binary_packages_architectures 'd_bp' 'd_bpa'
        printf ' LEFT'
        mysql_join_binary_packages_compressions 'd_bp' 'd_bpc'
        printf ' JOIN `binary_packages` AS `o_bp`'
        printf ' ON `d_bp`.`pkgname`=`o_bp`.`pkgname`'
        mysql_join_binary_packages_binary_packages_in_repositories 'o_bp' 'o_bpir'
        mysql_join_binary_packages_in_repositories_repositories 'o_bpir' 'o_r'
        printf ' AND `o_r`.`is_on_master_mirror`'
        printf ' AND `o_r`.`architecture`=`d_r`.`architecture`'
        printf ' JOIN `repository_stability_relations`'
        printf ' ON `repository_stability_relations`.`less_stable`=`d_r`.`stability`'
        printf ' AND `repository_stability_relations`.`more_stable`=`o_r`.`stability`'
        printf ' WHERE `o_bpir`.`id`=from_base64("%s")' \
          "$(
            printf '%s' "${bpir_id}" | \
              base64 -w0
          )"
        printf ';\n'
      } | \
        mysql_run_query | \
        tr '\t' ' ' | \
        expand_version 3 | \
        sort -k3V,3 -k2r,2 | \
        shrink_version 3 | \
        sed '
          s/^/'"${bpir_id}"' /
          $ a
        '
    done | \
      sed -n '
        /^\([0-9]\+\) \1 /,/^$/ d
        /^$/ d
        s/^[0-9]\+ \([0-9]\+ \)\(\S\+ \)\{2\}/\1/
        h
        /^[0-9]\+ 0 / {
          s/^\(\S\+ \)\{2\}//
          s/ \S\+$//
          w'"${tmp_dir}"'/repo-removes
          g
        }
        s/^\(\S\+ \)\{5\}//
        w'"${tmp_dir}"'/sftp-removes
        g
        s/ .*$//
        w'"${tmp_dir}"'/db-removes
      '

    for file in 'repo-removes' 'sftp-remove' 'db-removes'; do
      if [ -s "${tmp_dir}/${file}" ]; then
        sort -u "${tmp_dir}/${file}" | \
          sponge "${tmp_dir}/${file}"
      fi
    done

    # repo-remove packages
    while read -r arch repo pkgname; do
      mkdir "${tmp_dir}/transit"
      failsafe_rsync \
        "${master_mirror_rsync_directory}/${arch}/${repo}/${repo}.db."* \
        "${master_mirror_rsync_directory}/${arch}/${repo}/${repo}.files."* \
        "${tmp_dir}/transit/"
      repo-remove "${tmp_dir}/transit/${repo}.db.tar.gz" "${pkgname}"
      failsafe_rsync \
        "${tmp_dir}/transit/${repo}.db."* \
        "${tmp_dir}/transit/${repo}.files."* \
        "${master_mirror_rsync_directory}/${arch}/${repo}/"
      rm -rf --one-file-system "${tmp_dir}/transit"
    done < \
      "${tmp_dir}/repo-removes"

    # db-remove packages
    if [ -s "${tmp_dir}/db-removes" ]; then
      # shellcheck disable=SC2016
      {
        printf 'CREATE TEMPORARY TABLE `del` (`id` BIGINT NOT NULL AUTO_INCREMENT, PRIMARY KEY (`id`));\n'
        printf 'LOAD DATA LOCAL INFILE "%s" INTO TABLE `del` (`id`);\n' \
          "${tmp_dir}/db-removes"
        printf 'DELETE `binary_packages_in_repositories`'
        printf ' FROM `binary_packages_in_repositories`'
        printf ' JOIN `del`'
        printf ' ON `binary_packages_in_repositories`.`id`=`del`.`id`;\n'
        mysql_query_and_delete_unneeded_binary_packages
      } | \
        mysql_run_query | \
        sort -u >> \
        "${tmp_dir}/sftp-removes"
    fi

    # sftp-remove packages
    if [ -s "${tmp_dir}/sftp-removes" ]; then
      sed '
        p
        s/$/.sig/
      ' "${tmp_dir}/sftp-removes" | \
        sed '
          s|^|rm "|
          s|$|"|
        ' | \
        failsafe_sftp
    fi

  )

}

# wait_some_time $minimum $diff
# wait between minimum and minimum+diff seconds (diff defaults to 30)

wait_some_time() {
  local minimum="$1"
  local diff="$2"
  local random

  if [ -z "${diff}" ]; then
    diff=30
  fi

  random=$(
    dd if='/dev/urandom' count=1 2> /dev/null | \
      cksum | \
      cut -d' ' -f1
  )

  sleep $((minimum + random % diff))
}

# str_to_regex $string
# escape dots for use in regex

str_to_regex() {
  echo "$1" | \
    sed '
      s|[.[]|\\\0|g
    '
}


make_source_info_using_cache() {
  local package="$1"
  local repository="$2"
  local git_revision="$3"
  local mod_git_revision="$4"
  local output="$5"

  curl -LSs "https://buildmaster.archlinux32.org/pkginfo/${package}=${repository}=${git_revision}=${mod_git_revision}" \
  >"${output}"
}

# make_source_info $package $repository $git_revision $mod_git_revision $output
# create .SRCINFO from PKGBUILD within git repositories, output to $output
make_source_info() {

  local package="$1"
  local repository="$2"
  local git_revision="$3"
  local mod_git_revision="$4"
  local output="$5"

  ( # the new shell is intentional

    local epoch
    local pkgver

    tmp_dir=$(mktemp -d "${work_dir}/tmp.make_source_info.XXXXXX")
    trap 'rm -rf --one-file-system "${tmp_dir}"' EXIT

    extract_source_directory "${package}" "${repository}" "${git_revision}" "${mod_git_revision}" "${tmp_dir}" '0'

    {
      cd "${tmp_dir}"
      makepkg --printsrcinfo
      cd ..
    } > \
      "${tmp_dir}/SRCINFO"

    unset epoch
    unset pkgver
    eval "$(
      sed -n '
        s/^\t\(epoch\|pkgver\) = /\1=/
        T
        p
      ' "${tmp_dir}/SRCINFO"
    )"
    # shellcheck disable=SC2031
    sed -i '
      /^pkgname = /! b
      /= gtk-doc$/ b
      /= linux-api-headers$/ b
      s/= \(openjdk[0-9]\+\)-doc$/\0\n\tdepends = \1-src/
      t append_version
      s/= \(qt5\)-doc$/\0\n\tdepends = \1-base/
      t append_version
      s/= \(\S\+\)-i18n-\S\+$/\0\n\tdepends = \1/
      t append_version
      s/= \(linux\(-\S\+\)\?\)-\(docs\|headers\)$/\0\n\tdepends = \1/
      t append_version
      b
      :append_version
        s/$/='"${epoch}${epoch+:}${pkgver}"'/
    ' "${tmp_dir}/SRCINFO"

    cat "${tmp_dir}/SRCINFO" > \
      "${output}"

  )

}

# recursively_umount_and_rm $dir
# umount all mountpoints in $dir which are also in $dir's
#  filesystem, possibly also $dir itself and then
#  rm -rf --one-file-system $dir

recursively_umount_and_rm() {
  local dir="$1"

  if [ -z "${dir}" ]; then
    >&2 echo 'ERROR: recursively_umount_and_rm requires an argument'
    exit 42
  fi

  if [ ! -d "${dir}" ]; then
    >&2 printf 'ERROR: recursively_umount_and_rm requires a directory as argument - "%s" is not\n' \
      "${dir}"
    exit 42
  fi

  # the sh -c '...' construct branch below is borrowed from
  # archlinux/devtools lib/archroot.sh: is_subvolume(), is_same_fs() and
  # subvolume_delete_recursive()
  # shellcheck disable=SC1004,SC2016
  find "${dir}" \
    -depth \
    -xdev \
    -type d \
    -exec 'mountpoint' '-q' '{}' ';' \
    -exec 'sudo' 'umount' '-l' '{}' ';' \
    -prune \
    , \
    -inum 256 \
    -exec sh -c '
      [ "$(stat -f -c %T "$1")" = btrfs ] && \
      [ "$(stat -c %d "$1")" = "$2" ]
    ' {} "$(stat -c %d "${dir}")" \; \
    -exec btrfs subvolume delete {} \; \
    -prune || true
  rm -rf --one-file-system "${dir}" || true
}

# mangle_pkgbuild $PKGBUILD [$sub_pkgrel]
#  mangle $arch in PKBUILDs to contain i486, i686, pentium4
#  append $sub_pkgrel to the pkgrel
#  remove "lib32-" and "gcc-multilib" from {make,check,opt,}depends
#  remove $pkgrel from {make,check,opt,}depends

mangle_pkgbuild() {
  local PKGBUILD="$1"
  local sub_pkgrel="$2"

  if [ -n "${sub_pkgrel}" ]; then
    sub_pkgrel=".${sub_pkgrel}"
  fi

  if grep -q '^\s*pkgname=["'"'"']\?lib32-' "${PKGBUILD}"; then
    sed -i '
      s/^\(\s*pkgrel=\)['"'"'"]\?\([0-9]\+\)\.[0-9]*['"'"'"]\?\s*\(#.*\)\?$/\1"\2"/
    ' "${PKGBUILD}"
  fi

  sed -i '
    /^arch=[^#]*any/!{
      /^arch=(/s/(/(i486 i686 pentium4 /
    }
    s/^\(\s*pkgrel=\)['"'"'"]\?\([0-9]\+\)\(\.[0-9.]*\)\?['"'"'"]\?\s*\(#.*\)\?$/\1"\2'"${sub_pkgrel:-\\3}"'"/
  ' "${PKGBUILD}"

  # shellcheck disable=SC2016
  sed -i '
    /^\s*\(make\|check\|opt\|\)depends\(_[^=[:space:]]\+\)\?=(/ {
      :a
        /^\s*\(\S[^=]*\)=(\(\([^()"'"'"']\|"[^"]*"\|['"'"'][^'"'"']*['"'"']\s*\)*\(#[^\n]*\n\)\?\)*)/! {
          $b
          N
          ba
        }
      :b
        s/\(=.*["'"'"'([:space:]]\)lib32-/\1/g
        s/\(=.*["'"'"'([:space:]]\)gcc-multilib\(["'"'"')[:space:]]\)/\1gcc\2/g
        s/\(=.*["'"'"'([:space:]][^[:space:]$]\+[<=>]\S\+\)-[^:"'"'"')[:space:]]\+\([:"'"'"')[:space:]]\)/\1\2/g
      tb
    }
  ' "${PKGBUILD}"
}

# find_package_repository_to_package $package $git_repository $git_commit
# find the package repository a package from a given git repository
# belongs to

find_package_repository_to_package() {

  local package="$1"
  local git_repository="$2"
  local git_commit="$3"
  local repo_path
  local repo

  eval 'repo_path="${repo_paths__'"${git_repository}"'}"'

  if [ "${git_repository}" = 'archlinux32' ]; then
    repo=$(
      git -C "${repo_path}" archive "${git_commit}" -- | \
        tar -t --wildcards "*/${package}/" | \
        cut -d/ -f1 | \
        grep -vxF blacklist | \
        sort -u
    )
  else
    repo=$(
      git -C "${repo_path}" archive "${git_commit}" -- "${package}/repos" 2> /dev/null | \
        tar -t | \
        cut -d/ -f3 | \
        grep -vxF '' | \
        grep -v 'staging\|testing\|-unstable' | \
        grep -v -- '-i686$' | \
        sed 's|-[^-]\+$||' | \
        sort -u
    )
  fi

  if [ -z "${repo}" ]; then
    >&2 printf 'find_package_repository_to_package %s %s %s: no repo found\n' \
      "${package}" \
      "${git_repository}" \
      "${git_commit}"
    return 1
  fi

  if [ "$(
    echo "${repo}" | \
      wc -l
    )" -ne 1 ]; then
    >&2 printf 'find_package_repository_to_package %s %s %s: multiple repos found:\n' \
      "${package}" \
      "${git_repository}" \
      "${git_commit}"
    >&2 printf '%s\n' "${repo}"
    >&2 printf 'trying to filter based on git\n'

    if ! repo=$(
      # shellcheck disable=SC2016
      {
        printf 'SELECT `upstream_repositories`.`name`'
        printf ' FROM `upstream_repositories`'
        mysql_join_upstream_repositories_git_repositories
        printf ' WHERE `git_repositories`.`name`=from_base64("%s")' \
          "$(
            printf '%s' "${git_repository}" \
            | base64 -w0
          )"
      } | \
      mysql_run_query 'unimportant' | \
      grep -xF "${repo}"
    ); then
      >&2 printf 'find_package_repository_to_package %s %s %s: no repo found after filtering\n' \
        "${package}" \
        "${git_repository}" \
        "${git_commit}"
      return 1
    fi

    if [ "$(
      echo "${repo}" | \
        wc -l
      )" -ne 1 ]; then
      >&2 printf 'find_package_repository_to_package %s %s %s: still multiple repos found after filter:\n' \
        "${package}" \
        "${git_repository}" \
        "${git_commit}"
      >&2 printf '%s\n' "${repo}"
      return 1
    fi
  fi

  echo "${repo}"

}

# extract_source_directory $pkgbase $repository $revision $mod_revision $output $sub_pkgrel
# extract files found in the svn/git source directories

extract_source_directory() {

  local pkgbase="$1"
  local repository="$2"
  local revision="$3"
  local mod_revision="$4"
  local output="$5"
  local sub_pkgrel="$6"
  local res
  local tmptarfile
  local pkgtarfile

  if [ -n "${revision}" ] \
  && [ "${revision}" != '0000000000000000000000000000000000000000' ] \
  && [ "${repository}" != 'build-support' ]; then
    local pkgbase_translated
    pkgbase_translated=$(gitlab_project_name_to_path "${pkgbase}")
    tmptarfile=$(mktemp "${tmp_dir}"'/tmp.upstream-package.XXXXXXXXXX')
    url="https://buildmaster.archlinux32.org/upstream-packages/${pkgbase_translated}-${revision}.tar.gz"
    for i in {1..4}; do
        curl -o "$tmptarfile" -fLSs "${url}"
        res=$?
        if [ "$res" -ne 0 ]; then
          >&2 printf 'Download upstream-package "%s" from upstream via buildmaster cache failed. Curl exit code was %s.' \
            "${url}" \
            "${res}"
          return 1
        fi

        # If zero bytes, try again
        if [ -s "${tmptarfile}" ]; then
            break
        fi

	sleep 5
    done
    if [ -f "${tmptarfile}" ]; then
      tar -xz -f "${tmptarfile}" --strip-components=1 -C "${output}" -- "${pkgbase_translated}-${revision}"
      printf '\n' >> \
        "${output}/PKGBUILD"
    else
      >&2 echo 'No upstream tarfile, assuming the package is a local one and has a full PKGBUILD not a diff-PKGBUILD.'
    fi
  fi

  if [ -n "${mod_revision}" ] \
  && [ "${mod_revision}" != '0000000000000000000000000000000000000000' ]; then
    git -C "${repo_paths__archlinux32}" archive "${mod_revision}" -- "${repository}/${pkgbase}" \
    |tar -x --overwrite --exclude 'PKGBUILD' --strip-components=2 -C "${output}" 2> /dev/null \
    ||true
    git -C "${repo_paths__archlinux32}" archive "${mod_revision}" -- "${repository}/${pkgbase}/PKGBUILD" \
    |tar -Ox "${repository}/${pkgbase}/PKGBUILD" \
    >>"${output}/PKGBUILD"
    printf '\n' \
    >>"${output}/PKGBUILD"
  fi

  # we do not want to update pkgver, so we just undefine it
  printf 'unset -f pkgver\n' >> \
    "${output}/PKGBUILD"

  mangle_pkgbuild "${output}/PKGBUILD" "${sub_pkgrel}"

  # shellcheck disable=SC2016
  sed -i '/^\$Id\$$/d' "${output}/PKGBUILD"

  # we don't want write permissions on the PKGBUILD - otherwise pkgver()
  # will change the version! (**HACK**)
  chmod oga-w "${output}/PKGBUILD"
}

# download_sources_by_hash
# try to download all sources by their hash into the current directory
# returns 0 if any source was downloaded and 1 otherwise

download_sources_by_hash() {

  local return_value=1
  local tmp_dir
  local sum_type
  local arch_suffix

  if [ ! -f 'PKGBUILD' ]; then
    >&2 echo 'No PKGBUILD found - download_sources_by_hash() must be run from the source directory.'
    return 1
  fi

  tmp_dir=$(mktemp -d 'tmp.common-functions.download_sources_by_hash.XXXXXXXXXX' --tmpdir="$(pwd)")

  makepkg --printsrcinfo > "${tmp_dir}/.SRCINFO"

  for arch_suffix in '' '_i486' '_i686' '_pentium4'; do
    for sum_type in 'md5sum' 'sha1sum' 'sha256sum' 'sha512sum'; do
      grep '^\s*'"${sum_type}s${arch_suffix}"' = ' "${tmp_dir}/.SRCINFO" | \
        sed 's|^.* = ||' | \
        cat -n > \
        "${tmp_dir}/sums"
      grep '^\s*source'"${arch_suffix}"' = ' "${tmp_dir}/.SRCINFO" | \
        sed '
          s|^.* = ||
          s|::.*$||
          s|.*/||
        ' | \
        cat -n > \
        "${tmp_dir}/urls"
      if [ "$(wc -l < "${tmp_dir}/sums")" -eq "$(wc -l < "${tmp_dir}/urls")" ]; then
        join -1 1 -2 1 -o 1.2,2.2 "${tmp_dir}/sums" "${tmp_dir}/urls" > \
          "${tmp_dir}/joined"
        while read -r sum file; do
          if [ "${sum}" = 'SKIP' ]; then
            continue
          fi
          if echo "${sum}  ${file}" | \
            ${sum_type} -c > /dev/null 2>&1; then
            # the correct source is already there
            continue
          fi
          if wget -O "${tmp_dir}/transfer" "${source_by_hash_mirror}${sum_type}/${sum}"; then
            mv "${tmp_dir}/transfer" "${file}"
            return_value=0
          fi
        done < \
          "${tmp_dir}/joined"
      fi
    done
  done

  rm -rf --one-file-system "${tmp_dir}"
  return ${return_value}

}

# expand_version $column_num
# add "0:" to version in $colum_num-th column if no ":" is there (epoch)
# add "+0" to version in $colum_num-th column if no "+" is there (git count/hash)

expand_version() {
  local column_num
  column_num="$1"

  sed '
    /^\(\S\+\s\+\)\{'"$((column_num-1))"'\}\S*+/! s/^\(\(\S\+\s\+\)\{'"$((column_num-1))"'\}\S*\)-/\1+0-/
    /^\(\S\+\s\+\)\{'"$((column_num-1))"'\}\S*:/! s/^\(\(\S\+\s\+\)\{'"$((column_num-1))"'\}\)/\10:/
  '
}

# shrink_version $column_num
# remove "0:" from version in $colum_num-th column (epoch)
# remove "+0" from version in $colum_num-th column (git count/hash)

shrink_version() {
  local column_num
  column_num="$1"

  sed '
    s/^\(\(\S\+\s\+\)\{'"$((column_num-1))"'\}\S*\)+0-/\1-/
    s/^\(\(\S\+\s\+\)\{'"$((column_num-1))"'\}\)0:/\1/
  '
}

# sort_square_bracket_content $file
# sort the content of [] in $file, print to stdout

sort_square_bracket_content() {
  local file
  local line
  local token
  local token_list
  local rest
  file="$1"

  while read -r line; do
    printf '%s ' "${line}" | \
      tr ' ' '\n' | \
      while read -r token; do
        if echo "${token}" | \
          grep -qF '['; then
          printf '%s[' "${token%[*}"
          token="${token##*[}"
          token_list="${token%,}"
          while ! echo "${token_list}" | \
            grep -qF ']'; do
            read -r token
            token_list=$(
              printf '%s\n' \
                "${token_list}" \
                "${token%,}"
            )
          done
          rest="]${token_list#*]}"
          token_list="${token_list%%]*}"
          token=$(
            printf '%s' "${token_list}" | \
              sort | \
              sed 's|$|,|'
            printf '%s' "${rest}"
          )
        fi
        printf '%s\n' "${token}"
      done | \
      tr '\n' ' ' | \
      sed '
        s|, ]|]|g
        s| $||
      '
    printf '\n'
  done < \
    "${file}"
}

# smoothen_namcap_log $file
# remove unneccesary differences from namcap-logs:
#   - remove architecture specific information
#   - sort lines
#   - sort content of square brackets

smoothen_namcap_log() {
  local file
  file="$1"
  # shellcheck disable=SC2016
  sort_square_bracket_content "${file}" | \
    sed '
      # normalize architecture specific information
      s|i[34567]86|$ARCH|g
      s|x86\([-_]64\)\?|$ARCH|g
      # remove haskell hashes
      s|\('"'"'[^'"'"']*-[0-9.]\+\)-[a-zA-Z0-9]\{1,22\}\(-ghc[^'"'"']*'"'"'\)|\1\2|g
    ' | \
    sort | \
    sponge "${file}"
}

# trigger_mirror_refreshs
# trigger a refresh of capable tier 1 mirrors (as backup for master mirror)

trigger_mirror_refreshs() {
  local tmp_file

  tmp_file=$(mktemp 'tmp.common-functions.trigger_mirror_refreshs.XXXXXXXXXX' --tmpdir)
  date '+%s' > \
    "${tmp_file}"
  failsafe_rsync \
    "${tmp_file}" \
    "${master_mirror_rsync_directory}/lastupdate"
  rm "${tmp_file}"
  screen -wipe || true
  for trigger_url in ${mirror_refresh_trigger_urls}; do
    screen -S trigger-mirror-update -d -m curl -L --connect-timeout 10 "${trigger_url}"
  done
}

# extract_pkgname_epoch_pkgver_pkgrel_sub_pkgrel_arch_from_package_name
extract_pkgname_epoch_pkgver_pkgrel_sub_pkgrel_arch_from_package_name() {
  pkgname="$1"
  pkgname="${pkgname%.pkg.tar*}"
  arch="${pkgname##*-}"
  pkgname="${pkgname%-*}"
  sub_pkgrel="${pkgname##*-}"
  pkgname="${pkgname%-*}"
  pkgrel="${sub_pkgrel%.*}"
  if [ "${pkgrel}" = "${sub_pkgrel}" ]; then
    sub_pkgrel='0'
  else
    sub_pkgrel="${sub_pkgrel##*.}"
  fi
  epoch="${pkgname##*-}"
  pkgname="${pkgname%-*}"
  pkgver="${epoch#*:}"
  if [ "${pkgver}" = "${epoch}" ]; then
    epoch='0'
  else
    epoch="${epoch%%:*}"
  fi
}

# irc_say $channel [copy]
# say content of stdin in irc channel $channel (default: #archlinux32-devops)
# and print copy to stdout if 'copy' is given

# shellcheck disable=SC2120
irc_say() {
  local channel
  local content
  if [ -z "$1" ]; then
    channel='#archlinux32-devops'
  else
    channel="$1"
  fi
  if [ -s "${work_dir}/irc-shut-up" ] && \
    [ "$(date '+%s')" -gt "$(cat "${work_dir}/irc-shut-up")" ]; then
    rm "${work_dir}/irc-shut-up"
  fi
  content=$(cat)
  if [ "$2" = 'copy' ]; then
    printf '%s\n' "${content}"
  fi
  if [ -s "${work_dir}/irc-shut-up" ] && \
    [ -z "${channel%%#*}" ]; then
    return
  fi
  if [ -p "${irc_dir}/${channel}/in" ]; then
    printf '%s\n' "${content}" \
    | sponge "${irc_dir}/${channel}/in"
  else
    printf '%s\n' "${content}" \
    | sed 's@^@/j '"${channel}"' @' \
    | sponge "${irc_dir}/in"
  fi
}

# calculate_script_checksum
# calculate and print a checksum of the main script and all scripts in lib/
calculate_script_checksum() {
  {
    sha512sum "$0"
    find "${base_dir}/lib" -type f \
      -exec sha512sum '{}' \;
  } | \
    sort | \
    awk '{print $1}' | \
    sha512sum | \
    awk '{print $1}'
}

# verbose_flock
# flock wrapper with some informational output on error
verbose_flock() {
  local err=0
  flock "$@" || {
    err=$?
    lsof +c0 "/proc/$$/fd/$(
      printf '%s\n' "$@" | \
        grep -vm1 '^-'
    )" >&2 2>/dev/null || true
    >&2 printf 'FYI: I am %s.\n' "$$"
    return ${err}
  }
}

# recompress_gz $tmp_dir $file1.gz $file2.gz ...
# recompress the given file(s) to make them rsync friendly
recompress_gz() {
  tmp_file=$(mktemp "$1/recompress_gz.XXXXXXXX")
  shift
  local file
  for file in "$@"; do
    if [ ! -f "${file}" ]; then
      continue
    fi
    mv "${file}" "${tmp_file}"
    zcat "${tmp_file}" | \
      gzip --best --rsyncable > \
      "${file}"
  done
  rm "${tmp_file}"
}

# failsafe_sftp
# execute the commands from stdin on the master mirror, retrying if
# unsuccessful
# caveats:
#   - only checks for success of "rm", "ln", "rename"
#   - commands must be executable in arbitrary order
failsafe_sftp() {
  ( # new shell is intentional
    temp_dir=$(mktemp -d 'tmp.common-functions.sftp_failsafe.XXXXXXXXXX' --tmpdir)
    trial_counter=20
    trap 'rm -rf --one-file-system "${temp_dir}"' EXIT
    cat > "${temp_dir}/input"
    sed -n '
      s/^rm "\([^"]\+\)"$/- \1/
      s/^ln\( [^"]\S*\)* "[^"]\+" "\([^"]\+\)"$/+ \2/
      s/^rename "\([^"]\+\)" "\([^"]\+\)"$/- \1\n+ \2/
      T
      p
    ' "${temp_dir}/input" > \
      "${temp_dir}/expectations"
    if sed '
      1 i cd "'"${master_mirror_sftp_root}"'"
    ' "${temp_dir}/input" \
    | ${master_mirror_sftp_command}; then
      # we're done
      exit 0
    fi
    # make failing sftp commands non-fatal - maybe some succeeded above?
    sed -i '
      s/^[^-]/-\0/
    ' "${temp_dir}/input"
    # we stop on exhausted $trial_counter
    while [ ${trial_counter} -gt 0 ]; do
      wait_some_time 30
      # success requires 3 things:
      # - succeeding sftp executions (commands are non-critical already)
      # - succeeding sftp command to create listing (e.g. all expected
      #   files are found)
      # - no unexpected files were found
      if sed '
        1 i cd "'"${master_mirror_sftp_root}"'"
      ' "${temp_dir}/input" \
      | ${master_mirror_sftp_command} && \
        sed '
          s/^+ \(\S\+\)$/ls -1 "\1"/
          s,^- \(\S\+/\)[^/]\+$,ls -1 "\1",
        ' "${temp_dir}/expectations" | \
          sort -u | \
          sed '
            1 i cd "'"${master_mirror_sftp_root}"'"
          ' "${temp_dir}/input" | \
          ${master_mirror_sftp_command} > "${temp_dir}/check" && \
        ! grep -qxF "$(
          sed -n '
            s/^- //
            T
            p
          ' "${temp_dir}/expectations"
        )" "${temp_dir}/check"; then
        exit 0
      fi
      trial_counter=$((trial_counter-1))
    done
    exit 1
  ) || \
    return $?
}

# failsafe_rsync
# execute rsync with the given parameters on the master mirror, retrying
# if unsuccessful
# caveats:
#  - output might be garbled
#  - error code will be projected into {0,1}
failsafe_rsync() {
  local trial_counter

  trial_counter=20
  if ${master_mirror_rsync_command} "$@"; then
    return 0
  fi
  while [ ${trial_counter} -gt 0 ]; do
    wait_some_time 30
    if ${master_mirror_rsync_command} "$@"; then
      return 0
    fi
    trial_counter=$((trial_counter-1))
  done
  return 1
}

# update_blocked_packages_count
# update the count how many packages are blocked by a build assignment
update_blocked_packages_count() {
  ( # new shell is intentional
    temp_dir=$(mktemp -d 'tmp.sanity-check.XXXXXXXXXX' --tmpdir)
    trap 'rm -rf --one-file-system "${temp_dir}"' EXIT
    # shellcheck disable=SC2016
    {
      printf 'SELECT '
      printf '`a_bp`.`build_assignment`,'
      printf '`b_bp`.`build_assignment`'
      printf ' FROM `binary_packages` AS `a_bp`'
      mysql_join_binary_packages_binary_packages_in_repositories 'a_bp' 'a_bpir'
      printf ' AND `a_bpir`.`repository`=%s' \
        "${repository_ids__any_build_list}"
      mysql_join_binary_packages_dependencies 'a_bp'
      mysql_join_dependencies_dependency_types
      printf ' AND `dependency_types`.`relevant_for_binary_packages`'
      mysql_join_dependencies_install_target_providers_with_versions
      mysql_join_install_target_providers_binary_packages '' 'b_bp'
      mysql_join_binary_packages_binary_packages_in_repositories 'b_bp' 'b_bpir'
      printf ' AND `a_bpir`.`repository`=%s' \
        "${repository_ids__any_build_list}"
      printf ' WHERE `a_bp`.`architecture`=`b_bp`.`architecture`'
      printf ' OR `a_bp`.`architecture`=%s' \
        "${architecture_ids__any}"
      printf ' OR `b_bp`.`architecture`=%s' \
        "${architecture_ids__any}"
    } | \
      mysql_run_query 'unimportant' | \
      tr '\t' ' ' | \
      sort -u | \
      sort -k1,1 > \
      "${temp_dir}/links.new"
    touch "${temp_dir}/links.1" "${temp_dir}/links.2"
    # new links (sorted by 1st column); old links (sorted by 1st / 2nd column)
    while [ -s "${temp_dir}/links.new" ]; do
      cat "${temp_dir}/links.1" "${temp_dir}/links.new" | \
        sort -k2,2 > \
        "${temp_dir}/links.2"
      sort -k1,1 "${temp_dir}/links.2" > \
        "${temp_dir}/links.1"
      duplicates=$(
        uniq -d "${temp_dir}/links.1"
      )
      if [ -n "${duplicates}" ]; then
        >&2 echo 'internal error: there are %s duplicate links' \
          "$(
            printf '%s\n' "${duplicates}" | \
              wc -l
          )"
        exit 42
      fi
      {
        {
          join -1 2 -2 1 -o 1.1,2.2 "${temp_dir}/links.2" "${temp_dir}/links.new"
          sort -k2,2 "${temp_dir}/links.new" | \
            join -1 2 -2 1 -o 1.1,2.2 - "${temp_dir}/links.1"
          sort -k2,2 "${temp_dir}/links.new" | \
            join -1 2 -2 1 -o 1.1,2.2 - "${temp_dir}/links.new"
        } | \
          sort -u
        sed 'p' "${temp_dir}/links.1"
      } | \
        sort | \
        uniq -u | \
        sort -k1,1 | \
        sponge "${temp_dir}/links.new"
    done
    cut -d' ' -f2 "${temp_dir}/links.2" | \
      uniq -c | \
      sed 's/^\s\+//' | \
      tr ' ' '\t' > \
      "${temp_dir}/link-counts"
    # shellcheck disable=SC2016
    {
      printf 'CREATE TEMPORARY TABLE `lc` ('
        printf '`count` MEDIUMINT,'
        printf '`ba_id` BIGINT,'
        printf 'PRIMARY KEY (`ba_id`)'
      printf ');\n'
      printf 'LOAD DATA LOCAL INFILE "%s" INTO TABLE `lc`(`count`,`ba_id`);\n' \
        "${temp_dir}/link-counts"
      printf 'UPDATE `build_assignments`'
      printf ' LEFT JOIN `lc`'
      printf ' ON `build_assignments`.`id`=`lc`.`ba_id`'
      printf ' SET `build_assignments`.`currently_blocking`=`lc`.`count`;\n'
    } | \
      mysql_run_query 'unimportant'
  )
}

# extract_dependencies_from_package $pkgfile
# extract make-, run- and check-depends from $pkgfile
# format: deptype install_target version_relation epoch version
extract_dependencies_from_package() {
  {
    bsdtar -Oxf "$1" '.PKGINFO' \
    | sed '
      s/^checkdepend = /check /
      t
      s/^depend = /run /
      t
      s/^makedepend = /make /
      t
      d
    ' \
    | sed '
      s/\(=\|[<>]=\?\)\([^-]\+\)\(-[^-]\+\)\?$/ \1 \2/
      t
      s/$/ >= '"${min_version}"'/
    ' \
    | sed '
      s/:\(\S\+\)$/ \1/
      t
      s/ \(\S\+\)$/ 0 \1/
    '
    # inject base & base-devel
    printf ' >= %s\n' \
      "${min_version}" \
    | tr ':' ' ' \
    | sed '
      s/^.*$/run base\0\nmake base-devel\0/
    '
  } \
  | sort -u
}

# expand_blacklist_architectures $tmp_file
# expand the architecture of the blacklisted packages given on stdin as
# lines
# $arch<tab>$pkgbase/$pkgname/$whatever
expand_blacklist_architectures() {
  # shellcheck disable=SC2016
  {
    printf 'SELECT `superior`.`name`,`inferior`.`name`'
    printf ' FROM `architectures` AS `inferior`'
    printf ' JOIN `architecture_compatibilities`'
    printf ' ON `architecture_compatibilities`.`built_for`=`inferior`.`id`'
    printf ' JOIN `architectures` AS `superior`'
    printf ' ON `architecture_compatibilities`.`runs_on`=`superior`.`id`'
    # "any" has a special role - it should be regarded as *inferior* to
    # all architectures
    printf ' WHERE `superior`.`name`!="any"'
    printf ' AND `inferior`.`name`!="any";\n'
    printf 'SELECT "any",`architectures`.`name`'
    printf ' FROM `architectures`;\n'
  } \
  | mysql_run_query \
  | sort -k1,1 \
  > "$1"
  sort -k1,1 \
  | join -1 1 -2 1 -o 1.2,2.2 "$1" - \
  | sort -u
  rm "$1"
}

# taken verbatim from upstream archlinux:
# https://gitlab.archlinux.org/archlinux/devtools/-/raw/master/src/lib/api/gitlab.sh

# Convert arbitrary project names to GitLab valid path names.
#
# GitLab has several limitations on project and group names and also maintains
# a list of reserved keywords as documented on their docs.
# https://docs.gitlab.com/ee/user/reserved_names.html
#
# 1. replace single '+' between word boundaries with '-'
# 2. replace any other '+' with literal 'plus'
# 3. replace any special chars other than '_', '-' and '.' with '-'
# 4. replace consecutive '_-' chars with a single '-'
# 5. replace 'tree' with 'unix-tree' due to GitLab reserved keyword
gitlab_project_name_to_path() {
	local name=$1
	printf "%s" "${name}" \
		| sed -E 's/([a-zA-Z0-9]+)\+([a-zA-Z]+)/\1-\2/g' \
		| sed -E 's/\+/plus/g' \
		| sed -E 's/[^a-zA-Z0-9_\-\.]/-/g' \
		| sed -E 's/[_\-]{2,}/-/g' \
		| sed -E 's/^tree$/unix-tree/g'
}