#!/bin/bash
# tz-java-fix - get latest tz data, untar, fix, update java

# constants
site='ftp://ftp.iana.org/tz'

# variables
tmp="${TMPDIR:-/tmp}/tz-java-fix"

# tmp dir
mkdir -p $tmp/

# get remote links to latest releases
wget -nv -N -P $tmp/ --retr-symlinks=no $site/tzdata-latest.tar.gz	

# get remote name from link contents
mv -fv $tmp/tzdata-latest.tar.gz $tmp/tzdata-latest
latest=$(readlink $tmp/tzdata-latest)

# get release from remote name
release=${latest#*tzdata}
release=${release%.tar.gz}

# set up local names
datadir=tzdata$release
targz=tzdata$release.tar.gz

wget -nv -N -P $tmp/ $site/$latest
# tmp dir for editing Makefile
mkdir -p $tmp/$datadir/

tar -xf $tmp/$targz -C $tmp/$datadir/
sed -i "/^\s*VERSION\s*=\s*/s/\s*=\s*.*$/= $release/" $tmp/$datadir/Makefile
cd $tmp/$datadir/ 
tar -czf $tmp/tzdata-latest.tar.gz *
cd $OLDPWD
sha512sum $tmp/tzdata-latest.tar.gz | \
    sed 's/\s.*$//' > $tmp/tzdata-latest.tar.gz.sha512 
java -jar /usr/share/java/tzupdater.jar -l file://$tmp/tzdata-latest.tar.gz