#!/bin/sh

set -e

PRELOAD="/etc/ld.so.preload"
LIBNAME="libsnoopy.so"

[ -n "$SNOOPYDEBUG" ] && set -x

case "$1" in
    remove|upgrade|deconfigure)
        # remove $LIBNAME from $PRELOAD (if present)
        if grep -vqs "/${LIBNAME}$" $PRELOAD ; then
            # the file remains non-empty if $LIBNAME is removed
            TEMPFILE=`mktemp`
            grep -v "/${LIBNAME}$" $PRELOAD > "$TEMPFILE"
            mv -f "$TEMPFILE" $PRELOAD
        else
            rm -f $PRELOAD
        fi
        ;;
    failed-upgrade)
        ;;
    *)
        echo >&2 "prerm called with unknown argument $1"
    ;;
esac