wsrep_sst_rsync.sh remove some external comands

$(cat $pid_file) === $(< $pid_file)
$(dirname $a) === ${a%/*}
$(basename $a) === ${a##*/}

cleanup_joiner() {
 wsrep_log_info "Joiner cleanup."
 [ -r "$RSYNC_PID" ] && localpid=$(< "$RSYNC_PID") && kill $PID && sleep 0.5 && kill -9 $PID >/dev/null 2>&1 || :
     rm -rf "$RSYNC_CONF" "$MAGIC_FILE" "$RSYNC_PID"
    wsrep_log_info "Joiner cleanup done."
    if [ "${WSREP_SST_OPT_ROLE}" = "joiner" ];then
        wsrep_cleanup_progress_file
    fi
}

check_pid - remove

TODO bsd/osx check

check_pid_and_port()
{
    local rsync_port=$2

    [ -r $1 ] && lsof -p $(< $1) -n -a -i :$rsync_port -a -c rsync
}

    BINLOG_DIRNAME=${WSREP_SST_OPT_BINLOG%/*}
    BINLOG_FILENAME=${$WSREP_SST_OPT_BINLOG##*/}

RSYNC_PORT=${WSREP_SST_OPT_ADDR#*:}
if [ -z "$RSYNC_PORT" ]
    then
        RSYNC_PORT=4444
        RSYNC_ADDR=${WSREP_SST_OPT_ADDR%:*}
        ADDR=$RSYNC_ADDR:$RSYNC_PORT
fi