#!/bin/bash
# Run with no arguments from any directory, with no special setup required.

# Abort if any command returns an error exit status, or if an undefined
# variable is used.
set -e
set -u

echo "Looking for bionic..."
bionic_dir=$(cd $(dirname $0)/../../.. && pwd)
bionic_zoneinfo_dir=$bionic_dir/libc/zoneinfo
bionic_zoneinfo_tools_dir=$bionic_dir/libc/tools/zoneinfo
if [[ ! -d "$bionic_zoneinfo_dir" || ! -d "$bionic_zoneinfo_tools_dir" ]]; then
  echo "Can't find bionic's zoneinfo directories!"
  exit 1
fi

echo "Switching to temporary directory..."
temp_dir=`mktemp -d`
cd $temp_dir
trap "rm -rf $temp_dir; exit" INT TERM EXIT

# URL from "Sources for Time Zone and Daylight Saving Time Data"
# http://www.twinsun.com/tz/tz-link.htm
echo "Looking for new tzdata..."
wget -N --no-verbose 'ftp://elsie.nci.nih.gov/pub/tzdata*.tar.gz'
zoneinfo_version_file=$bionic_zoneinfo_dir/zoneinfo.version
if [ -f "$zoneinfo_version_file" ]; then
  current_version=tzdata`sed s/\n// < $zoneinfo_version_file`
else
  current_version=missing
fi
latest_archive=`ls -r -v tzdata*.tar.gz | head -n1`
latest_version=`basename $latest_archive .tar.gz`
if [ "$current_version" == "$latest_version" ]; then
  echo "You already have the latest tzdata ($latest_version)!"
  exit 1
fi

echo "Extracting $latest_version..."
mkdir $latest_version
tar -C $latest_version -zxf $latest_archive

echo "Compiling $latest_version..."
mkdir data
for i in \
    africa \
    antarctica \
    asia \
    australasia \
    etcetera \
    europe \
    factory \
    northamerica \
    solar87 \
    solar88 \
    solar89 \
    southamerica
do
    zic -d data $latest_version/$i
done

echo "Compacting $latest_version..."
(
    cat $latest_version/* | grep '^Link' | awk '{print $1, $2, $3}'
    (
        cat $latest_version/* | grep '^Zone' | awk '{print $2}'
        cat $latest_version/* | grep '^Link' | awk '{print $3}'
    ) | LC_ALL="C" sort
) | grep -v Riyadh8 > setup

javac -d . \
    $bionic_zoneinfo_tools_dir/ZoneCompactor.java \
    $bionic_zoneinfo_tools_dir/ZoneInfo.java
java ZoneCompactor setup data

echo "Updating bionic to $latest_version..."
mv zoneinfo.dat zoneinfo.idx $bionic_zoneinfo_dir
echo $latest_version | sed 's/tzdata//' > $bionic_zoneinfo_dir/zoneinfo.version