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#!/bin/sh

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

# Create a lock file.

if [ $# -eq 0 ]; then
  broken=$(
    find "${work_dir}/package-states" -maxdepth 1 -name '*.broken' -printf '%f\n' | \
      sed 's|\(\.[^.]\+\)\{4\}$||' | \
      sort -u
  )
  new_sum='x'
  sum=''
  tmp_dir=$(mktemp -d)
  trap 'rm -rf --one-file-system "${tmp_dir}"' EXIT
  find "${work_dir}/package-infos" -maxdepth 1 -name '*.builds' -exec \
    grep -HF '' {} \; | \
    sed '
      s|^.*/||
      s|\(\.[^.]\+\)\{4\}:| |
    ' | \
    sort -k2,2 > \
    "${tmp_dir}/builds"
  while ! [ "${new_sum}" = "${sum}" ]; do
    sum="${new_sum}"
    # shellcheck disable=SC2086
    printf '%s\n' ${broken} | \
      sort > \
      "${tmp_dir}/broken"
    broken=$(
      (
        find "${work_dir}/package-infos" -maxdepth 1 -name '*.build-depends' | \
          sed 's|^.*/\(.*\)\(\.[^.]\+\)\{4\}|\1 \0|' | \
          sort -k1,1 | \
          join -1 1 -2 1 -o 1.2 - "${tmp_dir}/broken" | \
          xargs -r cat
      ) | \
        sort -u | \
        join -1 1 -2 2 -o 2.1 - "${tmp_dir}/builds"
    )
    broken=$(
      (
        (
          # shellcheck disable=SC2086
          printf '%s\n' ${broken}
          cat "${tmp_dir}/broken"
        ) | \
          sort -u
        grep -vxF 'break_loops' "${work_dir}/build-list" | \
          awk '{print $1}' | \
          sort -u
      ) | \
        sort | \
        uniq -d
    )
    new_sum=$(
      # shellcheck disable=SC2086
      printf '%s\n' ${broken} | \
        sha512sum
    )
  done

  rm -rf --one-file-system "${tmp_dir}"
  trap - EXIT
  broken=$(
    (
      # shellcheck disable=SC2086
      printf '%s\n' ${broken}
      (
        find "${webserver_directory}/graphs" -maxdepth 1 -name '*.png' -printf '%f\n' | \
          sed 's|\.png$||'
        (
          grep -vxF 'break_loops' "${work_dir}/build-list" | \
            awk '{print $1}'
          cat "${work_dir}/deletion-list"
        ) | \
          sort -u
      ) | \
        sort | \
        uniq -d
    ) | \
      sort -u
  )
  # shellcheck disable=SC2086
  "$0" 'ALL' ${broken}
  (
    find "${webserver_directory}/graphs" -maxdepth 1 -name '*.png'
    # shellcheck disable=SC2086
    printf "${webserver_directory}"'/graphs/%s.png\n' ${broken} ${broken} 'ALL' 'ALL'
  ) | \
    sort | \
    uniq -u | \
    xargs -r rm
  exit
fi


if pgrep -f "^\S+ $0." | \
  grep -vxF "$$" >&2; then

  >&2 echo $$
  >&2 echo 'I was running already.'
  exit
fi

exec 9> "${work_dir}/${0##*/}.lock"
if ! flock -n 9; then
  echo 'Cannot get lock.'
  exit
fi

tmp_dir=$(mktemp -d)
trap 'rm -rf --one-file-system "${tmp_dir}"' EXIT

sort -u "${work_dir}/build-order" | \
  grep -v '^\(\S\+\) \1$' | \
  grep '^\S\+ \S\+$' > \
  "${tmp_dir}/original-build-order"

grep -vxF 'break_loops' "${work_dir}/build-list" | \
  sort -k1,1 > \
  "${tmp_dir}/build-list.sorted-by-package"

(
  sort -k1,1 "${tmp_dir}/original-build-order" | \
    join -1 1 -2 1 -o 1.1,1.2 - "${tmp_dir}/build-list.sorted-by-package"
  sort -k2,2 "${tmp_dir}/original-build-order" | \
    join -1 2 -2 1 -o 1.1,1.2 - "${tmp_dir}/build-list.sorted-by-package"
) | \
  sort -u | \
  sponge "${tmp_dir}/original-build-order"

find "${work_dir}/package-infos" -maxdepth 1 -printf '%f\n' | \
  sed 's|\(\.[^.]\+\)\{4\}$||' | \
  sort -u > \
  "${tmp_dir}/known-packages"

find "${work_dir}/package-infos" -maxdepth 1 -name '*.groups' -printf '%f %p\n' | \
  while read -r name pf; do
    xargs -r printf "${name%.*.*.*.*} %s\n" < \
      "${pf}"
  done > \
  "${tmp_dir}/known-groups"

find "${work_dir}/package-infos" -maxdepth 1 -name '*.packages' -printf '%f %p\n' | \
  while read -r name pf; do
    grep -vxF "${name%.*.*.*.*}" "${pf}" | \
      xargs -r printf "${name%.*.*.*.*} %s\n"
  done > \
  "${tmp_dir}/known-split-packages"

for target_package in "$@"; do

  output="${webserver_directory}/graphs/${target_package}.png"

  if [ "${target_package}" = 'ALL' ]; then

    # groups and split packages built by jobs on the build list
    cat "${tmp_dir}/known-groups" "${tmp_dir}/known-split-packages" | \
      sort -k1,1 | \
      join -1 1 -2 1 -o 1.2 - "${tmp_dir}/build-list.sorted-by-package" | \
      sort -u > \
      "${tmp_dir}/relevant-stuff"

    (
      # groups and split packages built by jobs on the build list - which are also dependencies of packages on the build-list
      sort -k1,1 "${tmp_dir}/original-build-order" | \
        join -1 1 -2 1 -o 2.1 - "${tmp_dir}/relevant-stuff"
      # build list jobs themself
      grep -vxF 'break_loops' "${work_dir}/build-list" | \
        awk '{print $1}'
    ) | \
      sort -u | \
      sponge "${tmp_dir}/relevant-stuff"

    {
      sort -k1,1 "${tmp_dir}/original-build-order" | \
        join -1 1 -2 1 -o 1.1,1.2 - "${tmp_dir}/relevant-stuff" | \
        sort -k2,2 | \
        join -1 2 -2 1 -o 1.1,1.2 - "${tmp_dir}/relevant-stuff"
      sed 's/.*/\0 \0/' "${tmp_dir}/relevant-stuff"
    } > \
      "${tmp_dir}/build-order"

    rm "${tmp_dir}/relevant-stuff"

  else

    grep " $(str_to_regex "${target_package}")\$" "${tmp_dir}/original-build-order" | \
      sort -u > \
      "${tmp_dir}/build-order"
    printf '0 target-package %s\n' "${target_package}" > \
      "${tmp_dir}/knots"

    last_sum=''
    current_sum=$(sha512sum "${tmp_dir}/build-order")
    while ! [ "${last_sum}" = "${current_sum}" ]; do

      last_sum="${current_sum}"

      awk '{print $1}' "${tmp_dir}/build-order" | \
        sort -u > \
        "${tmp_dir}/new"
      (
        cat \
          "${tmp_dir}/original-build-order" \
          "${tmp_dir}/known-split-packages"
        grep -v ' base\(-devel\)\?$' "${tmp_dir}/known-groups" || \
          true
      ) | \
        sort -k2,2 | \
        join -1 2 -2 1 -o 1.1,1.2 - "${tmp_dir}/new" | \
        sponge -a "${tmp_dir}/build-order"

      rm "${tmp_dir}/new"

      sort -u "${tmp_dir}/build-order" | \
        sponge "${tmp_dir}/build-order"

      current_sum=$(sha512sum "${tmp_dir}/build-order")

    done

  fi

#  grep -v '^\(\S\+\) \1$' "${tmp_dir}/build-order" | \
#    sponge "${tmp_dir}/build-order"

  # shellcheck disable=SC2129
  tr ' ' '\n' < \
    "${tmp_dir}/build-order" | \
    sort -u | \
    join -j 1 - "${tmp_dir}/build-list.sorted-by-package" | \
    while read -r pkg rev mod_rev repo; do
      if [ -f "${work_dir}/package-states/${pkg}.${rev}.${mod_rev}.${repo}.broken" ]; then
        printf '1 broken-build-list-package %s\n' "${pkg}"
      else
        printf '2 build-list-package %s\n' "${pkg}"
      fi
    done >> \
    "${tmp_dir}/knots"

  (
    sort -u "${work_dir}/deletion-list"
    tr ' ' '\n' < \
      "${tmp_dir}/build-order" | \
      sort -u
  ) | \
    sort | \
    uniq -d | \
    xargs -r printf '3 deletion-list-package %s\n' >> \
    "${tmp_dir}/knots"

  (
    awk '{print $2}' "${tmp_dir}/known-split-packages" | \
      sort -u
    tr ' ' '\n' < \
      "${tmp_dir}/build-order" | \
      sort -u
  ) | \
    sort | \
    uniq -d | \
    xargs -r printf '4 split-package %s\n' >> \
    "${tmp_dir}/knots"

  (
    cat "${tmp_dir}/known-packages"
    tr ' ' '\n' < \
      "${tmp_dir}/build-order" | \
      sort -u
  ) | \
    sort | \
    uniq -d | \
    xargs -r printf '5 package %s\n' >> \
    "${tmp_dir}/knots"

  (
    awk '{print $2}' "${tmp_dir}/known-groups" | \
      sort -u
    tr ' ' '\n' < \
      "${tmp_dir}/build-order" | \
      sort -u
  ) | \
    sort | \
    uniq -d | \
    xargs -r printf '6 group %s\n' >> \
    "${tmp_dir}/knots"

  tr ' ' '\n' < \
    "${tmp_dir}/build-order" | \
    sort -u | \
    xargs -r printf '100 unknown %s\n' >> \
    "${tmp_dir}/knots"

  sort -k3,3 -k1n,1 "${tmp_dir}/knots" | \
    uniq -f2 | \
    awk '{print $3 " " $1 " " $2}' | \
    sort -k2,3 | \
    sponge "${tmp_dir}/knots"

  if [ "${target_package}" != 'ALL' ]; then

    mkdir "${tmp_dir}/neighbours"
    cat "${tmp_dir}/knots" "${tmp_dir}/build-order" | \
      awk '{
        print $1 " " $2 > "'"${tmp_dir}/neighbours/"'"$1;
       print $1 " " $2 > "'"${tmp_dir}/neighbours/"'"$2;
      }'

    find "${tmp_dir}/neighbours" -maxdepth 1 -type f | \
      while read -r file; do
        sed "
            s@\(^\| \)$(str_to_regex "${file##*/}")\( \|\$\)@\1<knot>\2@
          " "${file}" | \
          sort -u | \
          sponge "${file}"
      done

    find "${tmp_dir}/neighbours" -maxdepth 1 -type f -exec \
      sha512sum {} \; | \
      sed 's|^\(\S\+\)  .*/\([^/]\+\)$|\2 \1|' | \
      sort -k2,2 | \
      uniq -f1 -D | \
      awk '{print $2 " " $1}' > \
      "${tmp_dir}/sums"

    rm -rf --one-file-system "${tmp_dir}/neighbours"

    sed '
      :a
      $!N
      s|^\(\S\+\) \([^\n]\+\)\n\1 |\1 \2<nl>|
      ta
      P
      D
    ' "${tmp_dir}/sums" | \
    join -1 1 -2 1 -o 2.2,1.2 - "${tmp_dir}/sums" | \
    while read -r original replacement; do
      sed -i "
        s@\( \|^\)$(str_to_regex "${original}")\( \|\$\)@\1${replacement}\2@
      " "${tmp_dir}/build-order" "${tmp_dir}/knots"
    done

  fi

  grep -v '^\(\S\+\) \1$' "${tmp_dir}/build-order" | \
    sort -u | \
    sponge "${tmp_dir}/build-order"
  sort -u "${tmp_dir}/knots" | \
    sponge "${tmp_dir}/knots"

  {
    printf '%s\n' \
      'digraph dependencies {' \
      '  fontname=dejavu;'

    cut -d' ' -f1,3 < \
      "${tmp_dir}/knots" | \
      while read -r who what; do
        if [ "${what}" = 'broken-build-list-package' ]; then
          color='#ff0000'
        elif [ "${what}" = 'build-list-package' ]; then
          color='#800000'
        elif [ "${what}" = 'target-package' ]; then
          color='#00ff00'
        elif [ "${what}" = 'package' ]; then
          color='#000000'
        elif [ "${what}" = 'split-package' ]; then
          color='#8080ff'
        elif [ "${what}" = 'group' ]; then
          color='#0000ff'
        elif [ "${what}" = 'deletion-list-package' ]; then
          color='#808080'
        else
          color='#ff80ff'
        fi
        printf '  "%s" [fontcolor="%s"];\n' "${who}" "${color}"
      done

    sed 's|\\|\\\\|g' "${tmp_dir}/build-order" | \
      xargs -rn2 printf '  "%s" -> "%s";\n' | \
      sort -u

    printf '%s\n' \
      '}'

  } > \
    "${tmp_dir}/input"

  sed -i '
    s|<nl>|,\\n|g
    s|<sp>|, |g
  ' "${tmp_dir}/input"

  line_count=$(wc -l < "${tmp_dir}/input")
  if [ "${line_count}" -gt 500 ] && [ "${target_package}" != 'ALL' ]; then
    sed -i '/"base\(-devel\)\?"/d' "${tmp_dir}/input"
    line_count=$(wc -l < "${tmp_dir}/input")
    if [ "${line_count}" -gt 700 ]; then
      rm -f "${output}"
      >&2 printf 'Skipping graph for "%s" - would be too big (%d).\n' \
        "${target_package}" \
        "${line_count}"
      continue
    fi
  fi
  printf 'small enough (%s): %d\n' \
    "${target_package}" \
    "${line_count}"

  touch "${output}"
  chmod 644 "${output}"

  if ! dot -Tpng -o "${output}" "${tmp_dir}/input"; then
    rm -f "${output}"
    continue
  fi

done

rm "${work_dir}/${0##*/}.lock"