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#!/bin/bash

# build packages one by one, then upload the binary package to the repository server
# Details:
#  https://github.com/archlinux32/builder/wiki/Build-system#build-packages

# TODOs:
#  use different build commands for different repositories - do we need this actually?
#  send logs of failed builds

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

usage() {
  >&2 echo ''
  >&2 echo 'build-packages: build package(s) on the build-list'
  >&2 echo ''
  >&2 echo 'possible options:'
  >&2 echo '  -h|--help:   Show this help and exit.'
  >&2 echo '  -n count:    Build $count packages (if available), then exit.'
  >&2 echo '               $count=0 is interpreted as infinity.'
  >&2 echo '               The default is $count=1.'
  [ -z "$1" ] && exit 1 || exit $1
}

eval set -- "$(
  getopt -o hn: \
    --long help \
    -n "$(basename "$0")" -- "$@" || \
  echo usage
)"

count=1

while true
do
  case "$1" in
    -h|--help)
      usage 0
    ;;
    -n)
      shift
      count="$1"
      [ ${count} -eq 0 ] && \
        count=-1
    ;;
    --)
      shift
      break
    ;;
    *)
      >&2 echo 'Whoops, forgot to implement option "'"$1"'" internally.'
      exit -1
    ;;
  esac
  shift
done

if [ $# -ne 0 ]; then
  >&2 echo 'Too many arguments.'
  usage
fi

while [ ${count} -ne 0 ]; do

  package="$(
    ssh \
      -i "${master_build_server_identity}" \
      -p "${master_build_server_port}" \
      "${master_build_server_user}@${master_build_server}" \
      'get-assignment'
  )"

  case $? in

    #  0: ok, I gave you an assignment
    0)
      [ ${count} -gt 0 ] && \
        count=$[${count}-1]
      repository="${package##* }"
      package="${package% *}"
      mod_git_revision="${package##* }"
      package="${package% *}"
      git_revision="${package##* }"
      package="${package% *}"

      # Update git repositories (official packages, community packages and the repository of package customizations).

      for repo in "${repo_paths[@]}"; do
        git -C "${repo}" clean -df
        git -C "${repo}" reset --hard
        git -C "${repo}" checkout master
        git -C "${repo}" pull
      done

      git -C "${repo_paths["$(find_repository_with_commit "${git_revision}")"]}" checkout "${git_revision}" &> /dev/null
      git -C "${repo_paths["archlinux32"]}" checkout "${mod_git_revision}" &> /dev/null

      PKGBUILD="$(find_pkgbuild "${package}" "${repository}")"

      if [ ! -r "${PKGBUILD}" ]; then
        echo "can't find PKGBUILD to package '${package}' from repository '${repository}': '${PKGBUILD}'"
        exit 1
      fi

      cd "${PKGBUILD%/*}"
      apply_package_customizations
      success=false
      for parameters in '' '-c'; do
        rm -f *.pkg.tar.xz{,.sig}
        if staging-i486-build ${parameters}; then
        # build successful
          ls -1 *.pkg.tar.xz | \
            xargs -rn1 gpg --local-user="${package_key}" --detach-sign
          tar -c 'package.tar' *.pkg.tar.xz{,.sig}
          while true; do
            ssh \
              -i "${master_build_server_identity}" \
              -p "${master_build_server_port}" \
              "${master_build_server_user}@${master_build_server}" \
              'return-assignment' "${package}" "${git_revision}" "${mod_git_revision}" "${repository}" \
              < 'package.tar'
            case $? in
              0)
                break
              ;;
              1)
                # 'return-assignment' was running already
                sleep $[15+$RANDOM%30]
              ;;
              2)
                >&2 echo 'I was too slow, the package is outdated. I will continue ...'
                break
              ;;
              3)
                >& echo "'return-assignment' reports a signature error."
                exit 1
              ;;
              *)
                >&2 echo "unknown return code $? from 'return-assignment'"
                exit 1
            esac
          done
          success=true
          break
        fi
      done

      if ! ${success}; then
        ssh \
          -i "${master_build_server_identity}" \
          -p "${master_build_server_port}" \
          "${master_build_server_user}@${master_build_server}" \
          'return-assignment' "${package}" "${git_revision}" "${mod_git_revision}" "${repository}" 'ERROR'
      fi

      continue

    ;;

    #  1: come back (shortly) later - I was running already
    1)
      sleep $[15+$RANDOM%30]
      continue
    ;;

    #  2: come back later - there are still packages to be built,
    #     but currently none has all its dependencies ready
    2)
      sleep $[60+$RANDOM%30]
      continue
    ;;

    #  3: come back after the next run of get-package-updates - currently
    #     there are no pending packages
    3)

      >&2 echo 'Done. No more packages left to build.'
      exit 0

    ;;

    #  4: come back, when you've done your work - you hit the limit on
    #     maximum allowed parallel jobs per ip
    4)

      >&2 echo 'ERROR: There are too many parallel builds running on this machine.'
      exit 1

    ;;

    *)

      >&2 echo "ERROR: Unknown exit code $? from 'get-assignment'."
      exit 1

    ;;

  esac

done

>&2 echo 'Done.'