#!/bin/bash

# report back on a build assignment
# either on success via:
#   "$0 $package $revision $mod_revision $repository" and tar'ed packages (= a tar of
#   package(s) and signature(s)) on stdin
# or on failure via:
#   "$0 $package $revision $mod_revision $repository ERROR"

# exit codes:
#  0: ok
#  1: another instance was already running
#  2: outdated package
#  3: signature error

# TODO:
#  use lock file for build list
#  remove old version(s) of newly compiled packages
#  check that received archive contains the expected packages

. "${0%/*}/../conf/default.conf"

# Create a lock file and a trap.

exec 9> "${build_list_lock_file}"
if ! flock -n 9; then
  >&2 echo 'come back (shortly) later - I cannot lock build list.'
  exit
fi
  exit 1
fi

function clean_up {
  rm -f "${build_list_lock_file}"
}

trap clean_up EXIT

if [ "$5" == 'ERROR' ]; then
# the build failed on the build slave

  mv "${work_dir}/package-states/$1.$2.$3.$4."{locked,broken}

  # unlock every loop this package would have broken and which is not
  # broken by another locked package
  (
    # loops broken by another locked package
    ls "${work_dir}/package-states/"{*.*.*.*,$1.$2.$3.$4}.locked | \
      sort | \
      uniq -u | \
      sed 's|\.locked$||' | \
      xargs -n1 sed '1d' | \
      sort -u | \
      sed 'p'
    # loops broken by this package
    sed '1d' "${work_dir}/package-states/$1.$2.$3.$4"
  ) | \
    sort | \
    uniq -u | \
    sed 's|$|.locked|' | \
    xargs -rn1 rm -f

  exit 0

fi

# the build was successful on the build slave

if ! grep -q "^${1//./\\.} $2 $3 $4\$" "${work_dir}/build-list"; then
  >&2 echo 'Sorry, the sent package is outdated.'
  exit 2
fi

function clean_up {
  popd > /dev/null
  rm -rf --one-file-system "${tmp_dir}"
}

tmp_dir="$(mktemp -d)"
pushd "${tmp_dir}" > /dev/null
trap clean_up EXIT

# extract package(s)
tar -x

signature_errors="$(
  ls -1 *.pkg.tar.xz{,.sig} | \
    sed 's|\.sig$||' | \
    sort | \
    uniq -c | \
    grep -v '^\s*2\s' | \
    awk '{print $2}'
)"

if [ -n "${signature_errors}" ]; then
  >&2 echo 'The following packages lack a signature or vice versa:'
  >&2 echo "${signature_errors}"
  exit 3
fi

# move packages
packages=(*.pkg.tar.xz)
mkdir -p "${master_mirror_directory}/i486/$4-staging/"
mv *.pkg.tar.xz{,.sig} "${master_mirror_directory}/i486/$4-staging/"

pushd "${master_mirror_directory}/i486/$4-staging" > /dev/null
repo-add -v -s -k "${repo_key}" "$4-staging.db.tar.gz" "${packages[@]}"
popd > /dev/null

# remove all loops which are broken by this package
sed '1d' "${work_dir}/package-states/$1.$2.$3.$4.locked" | \
  sort -u | \
  sed 'p;s|$|.locked|' | \
  xargs -rn1 rm -f

# remove package from build list
sed -i "/^${1//./\\.} $2 $3 $4\$/d" "${work_dir}/build-list"

# remove package lock file
rm "${work_dir}/package-states/$1.$2.$3.$4.locked"