#!/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:
#  include package customizations
#  handle failed builds
#  actually upload the package
#  use different build commands for different repositories
#  sign packages

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

while true; 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)
      repository="${package##* }"
      package="${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 "${repo}" checkout master
        git -C "${repo}" pull
        git -C "${repo}" checkout "${git_revision}" &> /dev/null || true
      done

      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%/*}"
        extra-i686-build
      )
      # imagine a blinking cursor here
      >&2 echo 'whoops, end of program reached.'
      exit 42

    ;;

    #  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 $?."
      exit 1

    ;;

  esac

done