#!/bin/bash
##############################################################################
# Copyright (c) 2015 Ericsson AB and others.
# stefan.k.berg@ericsson.com
# jonas.bjurel@ericsson.com
# All rights reserved. This program and the accompanying materials
# are made available under the terms of the Apache License, Version 2.0
# which accompanies this distribution, and is available at
# http://www.apache.org/licenses/LICENSE-2.0
##############################################################################


patch_package () {
    deb=$1
    pkgdep=$2
    newrev=$3


    tmpdir=`mktemp -d /tmp/patchXXXXX`

    cp $deb $tmpdir
    pushd $tmpdir > /dev/null

    mkdir -p repack
    dpkg -x $deb repack

    mkdir -p repack/DEBIAN
    dpkg -e $deb repack/DEBIAN


    pushd repack/DEBIAN > /dev/null

    echo "Before: `cat control | grep '^Depends:'`"
    sed -i "s/$pkgdep (\([^ ]*\) [^)]*)/$pkgdep (\1 $newrev)/"  control
    echo "After: `cat control | grep '^Depends:'`"
    popd > /dev/null

    fakeroot dpkg-deb --build repack

    popd > /dev/null

    cp $tmpdir/repack.deb $deb
    rm -Rf $tmpdir
}

# Name of package for which to check dependencies to
PKGDEP=$1
# The old revision of the package in question
OLDREV=$2
# The new revision of the package in question
NEWREV=$3

if [ -z "$PKGDEP" ]; then
    echo "No package dependency name"
    exit 1
fi

if [ -z "$OLDREV" ]; then
    echo "No old rev"
    exit 1
fi

if [ -z "$NEWREV" ]; then
    echo "No new rev"
    exit 1
fi


for deb in *.deb
do
    ar p $deb control.tar.gz | tar xzO ./control | grep -q "^Depends:.* ${PKGDEP} ([^ ]* ${OLDREV})"
    if [ $? -eq 0 ]; then
        name=`ar p $deb control.tar.gz | tar xzO ./control | grep "^Package:.* " | sed 's/.* //'`
        echo "**** Changing dependencies line in $deb ($name) ****"
        patch_package $deb $PKGDEP $NEWREV
    fi
done