#! /bin/sh
# (C) 2005, Pierre Habouzit <madcoder@debian.org>
# GPL'ed code follows.

#####################################################################
#
# TODO :
#  That part may certainly be automatized instead of the user giving
#  the version as an argument
#
[ -n "$1" ] || {
    echo "usage: check-shlibs2 version"
    echo
    echo "  version   the version (with revision) that has been uploaded last"
    echo "            this version is used to perform the symbols analysis"
    exit 1
}
LAST_VERSION=$1
#
#####################################################################

dh_testdir || exit 1
eval `dpkg-architecture`

NM='nm --dynamic --defined-only --no-sort'
SOURCE=`awk '/^Source:/ {print $2}' debian/control`
VERSION=`dpkg-parsechangelog | grep -E '^Version:' | cut -f 2 -d ' '`
SHLIBS_SVN='svn://svn.debian.org/pkg-kde/branches/kde-3.4.0/shlibs'
WHERE=debian/shlibs-check

perror() {
    echo >&2 "$1"
}

#####################################################################
#
# make_symbols_tree foo bar
#
#   make a symbol tree snapshot from the libs in dir $foo
#   and put it in dir $bar
#
make_symbols_tree () {
    SRC=$1
    DST=$2

    find "$SRC" -name '*.so.[0-9]' | while read lib; do
        P=`dirname $lib`
        L=$DST/${P##$SRC/}
        test -d $L || mkdir -p $L 2>/dev/null

        $NM $lib | awk '{print $3}' | env LC_COLLATE=C sort >$L/`basename $lib`
    done
}


#####################################################################
#
# make_old_symbols pkg
#
#   try to get the package pkg_$version_$arch.deb , if it fails,
#   then we assume it was an arch-indep package, else we extract it
#   and (try to) build a symbol tree from it.  then we clean all up
#
make_old_symbols () {
    BASE=$1

    LETTER=`echo $SOURCE | cut -b1`
    PKG=${BASE}_${LAST_VERSION}_${DEB_BUILD_ARCH}.deb
    URL=http://ftp.debian.org/debian/pool/main/$LETTER/$SOURCE/$PKG

    TMP=debian/old/$BASE
    
    if wget -q $URL; then
        test -d $TMP || mkdir -p $TMP 2>/dev/null
        dpkg -x $PKG $TMP
        make_symbols_tree $TMP $WHERE/$SOURCE.old/$BASE
        rm -rf $PKG debian/old
    else
        perror "E: Couldn't get the package $PKG."
        exit 1
    fi
}


#####################################################################
#
# check_symbols_equal pkg
#
#   test with diff if the symbols trees for the current build
#   and the last uploaded package are the same
#
check_symbols_equal () {
    test -d $WHERE/$SOURCE/$p || return

    if diff -NrU0 $WHERE/$SOURCE.old/$p $WHERE/$SOURCE/$p; then
        perror "-- $p has no differences"
    else
        perror "** $p has differences"
    fi
}

#####################################################################
#####################################################################

rm -rf $WHERE

for p in `/usr/lib/cdbs/list-packages arch`; do
    make_old_symbols $p
    make_symbols_tree debian/$p $WHERE/$SOURCE/$p
    check_symbols_equal $p
done