#!/bin/bash
#
# Copyright (C) 2006-2007 Daniel Holbach <daniel.holbach@ubuntu.com>
# Modified by Siegfried-A. Gevatter <rainct@ubuntu.com>
#
# ##################################################################
#
# This program is free software; you can redistribute it and/or
# modify it under the terms of the GNU General Public License
# as published by the Free Software Foundation; version 2.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
#
# See file /usr/share/common-licenses/GPL-2 for more details.
#
# ##################################################################
#
# This script is used to get a diff of the exported symbols of all .so files in
# every binary package of package $1.

# Required tools (besides awk, coreutils, grep and sed):
# * apt-cache and apt-get (from apt)
# * diff (from diffutils)
# * dpkg
# * lsb_release (from lsb-release)
# * nm (from binutils)

DISTRO=$(lsb_release -c -s)
VERSION=$(apt-cache madison "$1" | grep -- "$DISTRO"'/.*Sources$' | awk '{print $3}')
PACKAGES=$(apt-cache showsrc "$1" | grep-dctrl -s Binary -F Version "$VERSION" | sed 's/Binary\:\ //g;s/\,//g' | sort -u)
DEBLINE=""
DEBUG=False

if [[ -z $1 ]]; then
    echo "Missing argument: source package name."
    exit 1
fi

if [[ -z $2 ]]; then
    DEBDIR="/var/cache/pbuilder/result"
else
    DEBDIR="$2"
fi

if [ `id -u` != "0" ]
then
    echo
    echo -n "You might now be asked for your password, as this script requires"
    echo " sudo privilegies in order to install the packages you want to check."
    echo
fi

sudo apt-get install $PACKAGES
echo

for pack in $PACKAGES;
do
    for lib in `dpkg -L $pack | grep -E "\.so$" | sort -u`
    do
        LIBNAME=$(basename $lib)
        nm -D $lib | cut -d' ' -f3 | sort -u > /tmp/$LIBNAME.old
    done;
    DEBLINE="$DEBLINE $DEBDIR/$pack*.deb "
done

if [[ -z $DEBLINE ]]; then
    echo "Package doesn't exist: $1."
    exit 1
fi

NOFILE=True
for filename in $DEBLINE; do
    if [[ ${filename: -5} != "*.deb" ]]; then
        NOFILE=False
        [[ $DEBUG != True ]] || echo "Found binary file: $filename"
    fi
done

if [[ $NOFILE == True ]]; then
    echo "No matching binary files found in «$DEBDIR»."
    exit 1
fi

sudo dpkg -i $DEBLINE;
echo

for pack in $PACKAGES;
do
    for lib in `dpkg -L $pack | grep -E "\.so$" | sort -u`
    do
        LIBNAME=$(basename $lib)
        nm -D $lib | cut -d' ' -f3 | sort -u > /tmp/$LIBNAME.new
        echo "Checking: $lib"
        diff -u /tmp/$LIBNAME.{old,new}
        rm /tmp/$LIBNAME.{old,new}
    done;
done