function print_usage_and_exit() {

  echo "Usage: create-tar.sh tar_stamp"

  echo ""

  echo "Where tar_stamp should look like this:"

  echo ""

  cat << EOF

# Node ID: 64ee63facd4ff96b3e8590cff559d7e97ac6b061

PRODUCT="firefox" # "firefox" or "thunderbird"

CHANNEL="esr60"

VERSION="60.7.0"

VERSION_SUFFIX="esr"

FF_RELEASE_TAG="" # Needs only to be set if no tar-ball can be downloaded

TB_RELEASE_TAG="" # Only relevant for Thunderbird

PREV_VERSION="60.6.3" # Prev. version only needed for locales (leave empty to force l10n-generation)

PREV_VERSION_SUFFIX="esr"

#SKIP_LOCALES="" # Uncomment to skip l10n and compare-locales-generation

EOF

exit 1

}

if [ $# -ne 1 ]; then

  print_usage_and_exit

fi

# Sourcing the given tar_stamp-file to have the variables available

source "$1" || print_usage_and_exit

# Internal variables

BRANCH="releases/mozilla-$CHANNEL"

if [ "$PRODUCT" = "firefox" ]; then

  LOCALE_FILE="firefox-$VERSION/browser/locales/l10n-changesets.json"

else

  LOCALE_FILE="thunderbird-$VERSION/comm/mail/locales/l10n-changesets.json"

fi

SOURCE_TARBALL="$PRODUCT-$VERSION$VERSION_SUFFIX.source.tar.xz"

FTP_URL="https://ftp.mozilla.org/pub/$PRODUCT/releases/$VERSION$VERSION_SUFFIX/source"

# Make first letter of PRODCUT upper case

PRODUCT_CAP="${PRODUCT^}"

LOCALES_URL="https://product-details.mozilla.org/1.0/l10n/$PRODUCT_CAP"

# Exit script on CTRL+C

trap "exit" INT

function check_tarball_source () {

  TARBALL=$1

  # Print out what is going to be done:

  if [ -e $TARBALL ]; then

      echo "Reuse existing file"

  elif wget --spider $FTP_URL/$TARBALL 2> /dev/null; then

      echo "Download file"

  else

      echo "Mercurial checkout"

  fi

}

function ask_cont_abort_question() {

  while true; do

    read -p "$1 [(c)ontinue/(a)bort] " ca

    case $ca in

        [Cc]* ) return 0 ;;

        [Aa]* ) return 1 ;;

        * ) echo "Please answer c or a.";;

    esac

  done

}

function check_for_binary() {

  if ! test -x $1; then

    echo "$1 is missing: execute zypper in $2"

    exit 5

  fi

}

function locales_get() {

  TMP_VERSION="$1"

  URL_TO_CHECK="${LOCALES_URL}-${TMP_VERSION}"

  LAST_FOUND=""

  # Unfortunately, locales-files are not associated to releases, but to builds.

  # And since we don't know which build was the final build, we go from 1 to

  # the last we find and try to find the latest one that exists.

  # Error only if not even the first one exists

  for BUILD_ID in $(seq 1 9); do

    FINAL_URL="${URL_TO_CHECK}-build${BUILD_ID}.json"

    if wget --quiet --spider "$FINAL_URL"; then

      LAST_FOUND="$FINAL_URL"

    elif [ $BUILD_ID -gt 1 ]; then

      echo "$LAST_FOUND"

      return 0

    else

      echo "Error: Could not find locales-file (json) for Firefox $TMP_VERSION !"  1>&2

      return 1

    fi

  done

}

function locales_parse() {

  URL="$1"

  curl -s "$URL" | python -c "import json; import sys; \

             print('\n'.join(['{} {}'.format(key, value['changeset']) \

                for key, value in sorted(json.load(sys.stdin)['locales'].items())]));"

}

function locales_unchanged() {

  # If no json-file for one of the versions can be found, we say "they changed"

  prev_url=$(locales_get "$PREV_VERSION$PREV_VERSION_SUFFIX") || return 1

  curr_url=$(locales_get "$VERSION$VERSION_SUFFIX")      || return 1

  prev_content=$(locales_parse "$prev_url") || exit 1

  curr_content=$(locales_parse "$curr_url") || exit 1

  diff -y --suppress-common-lines -d <(echo "$prev_content") <(echo "$curr_content")

}

check_for_binary /usr/bin/hg "mercurial"

check_for_binary /usr/bin/jq "jq"

which python > /dev/null || exit 1

if [ -z ${SKIP_LOCALES+x} ]; then

  # TODO: Thunderbird has usually "default" as locale entry. 

  # There we probably need to double-check Firefox-locals

  # For now, just download every time for Thunderbird

  if [ "$PRODUCT" = "firefox" ] && [ "$PREV_VERSION" != "" ] && locales_unchanged; then

    printf "%-40s: Did not change. Skipping.\n" "locales"

    LOCALES_CHANGED=0

  else

    printf "%-40s: Need to download.\n" "locales"

    LOCALES_CHANGED=1

  fi

else 

  printf "%-40s: User forced skip (SKIP_LOCALES set)\n" "locales"

fi

# Check what is going to be done and ask for consent

for ff in $SOURCE_TARBALL $SOURCE_TARBALL.asc; do

  printf "%-40s: %s\n" $ff "$(check_tarball_source $ff)"

done

$(ask_cont_abort_question "Is this ok?") || exit 0

# Try to download tar-ball from officiall mozilla-mirror

if [ ! -e $SOURCE_TARBALL ]; then

  wget https://ftp.mozilla.org/pub/$PRODUCT/releases/$VERSION$VERSION_SUFFIX/source/$SOURCE_TARBALL

fi

# including signature

if [ ! -e $SOURCE_TARBALL.asc ]; then

  wget https://ftp.mozilla.org/pub/$PRODUCT/releases/$VERSION$VERSION_SUFFIX/source/$SOURCE_TARBALL.asc

fi

if [ -e $SOURCE_TARBALL ]; then

  if [ -z ${SKIP_LOCALES+x} ]; then

    # still need to extract the locale information from the archive

    echo "extract locale changesets"

    tar -xf $SOURCE_TARBALL $LOCALE_FILE

  fi

  # We are working on a version that is not yet published on the mozilla mirror

  # so we have to actually check out the repo

  if [ -d $PRODUCT-$VERSION ]; then

    pushd $PRODUCT-$VERSION || exit 1

        popd || exit 1

        popd || exit 1

        rm -rf $PRODUCT-$VERSION

  if [ ! -d $PRODUCT-$VERSION ]; then

    hg clone http://hg.mozilla.org/$BRANCH $PRODUCT-$VERSION

    if [ "$PRODUCT" = "thunderbird" ]; then

      hg clone http://hg.mozilla.org/releases/comm-$CHANNEL thunderbird-$VERSION/comm

    fi

  pushd $PRODUCT-$VERSION || exit 1

  hg update --check $FF_RELEASE_TAG

  [ "$FF_RELEASE_TAG" == "default" ] || hg update -r $FF_RELEASE_TAG

  if [ "$PRODUCT" = "thunderbird" ]; then

    pushd comm || exit 1

    hg update --check $TB_RELEASE_TAG

    popd || exit 1

    rm -rf thunderbird-${VERSION}/{,comm/}other-licenses/7zstub

  fi

  popd || exit 1

  tar $compression -cf $PRODUCT-$VERSION$VERSION_SUFFIX.source.tar.xz --exclude=.hgtags --exclude=.hgignore --exclude=.hg --exclude=CVS $PRODUCT-$VERSION

fi

if [ ! -z ${SKIP_LOCALES+x} ]; then

  echo "Skipping locales-creation."

  exit 0

if [ $LOCALES_CHANGED -ne 0 ]; then

  # l10n

  echo "fetching locales..."

  test ! -d l10n && mkdir l10n

  jq -r 'to_entries[]| "\(.key) \(.value|.revision)"' $LOCALE_FILE | \

    while read locale changeset ; do

      case $locale in

        ja-JP-mac|en-US)

          ;;

        *)

          echo "reading changeset information for $locale"

          echo "fetching $locale changeset $changeset ..."

          if [ -d "l10n/$locale/.hg" ]; then

            pushd "l10n/$locale" || exit 1

            hg pull

            popd || exit 1

          else

            hg clone "http://hg.mozilla.org/l10n-central/$locale" "l10n/$locale"

          fi

          [ "$FF_RELEASE_TAG" == "default" ] || hg -R "l10n/$locale" up -C -r "$changeset"

          ;;

      esac

    done

  echo "creating l10n archive..."

if [ "$PRODUCT" = "thunderbird" ]; then

    TB_TAR_FLAGS="--exclude=browser --exclude=suite"

fi

  tar $compression -cf l10n-$VERSION$VERSION_SUFFIX.tar.xz \

  --exclude=.hgtags --exclude=.hgignore --exclude=.hg \

  $TB_TAR_FLAGS \

  l10n

fi

if [ -d compare-locales/.hg ]; then

  pushd compare-locales || exit 1

  hg pull

  popd || exit 1

else

  hg clone http://hg.mozilla.org/build/compare-locales

fi