#!/usr/bin/env bash # -*- shell-script-mode -*- # # Helpers for NBD server related config # # Copyright (C) 2018 Red Hat, Inc. # # 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; either version 2 of the License, or # (at your option) any later version. # # 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. # # You should have received a copy of the GNU General Public License # along with this program. If not, see . # nbd_unix_socket="${TEST_DIR}/qemu-nbd.sock" nbd_tcp_addr="127.0.0.1" nbd_pid_file="${TEST_DIR}/qemu-nbd.pid" nbd_stderr_fifo="${TEST_DIR}/qemu-nbd.fifo" # If bash version is >= 4.1, this will be overwritten by a dynamically # assigned file descriptor value. nbd_fifo_fd=10 nbd_server_stop() { local NBD_PID if [ -f "$nbd_pid_file" ]; then read NBD_PID < "$nbd_pid_file" rm -f "$nbd_pid_file" if [ -n "$NBD_PID" ]; then kill "$NBD_PID" fi fi rm -f "$nbd_unix_socket" "$nbd_stderr_fifo" } nbd_server_start_unix_socket() { nbd_server_stop $QEMU_NBD -v -t -k "$nbd_unix_socket" --fork "$@" } nbd_server_start_tcp_socket() { nbd_server_stop mkfifo "$nbd_stderr_fifo" for ((port = 10809; port <= 10909; port++)) do # Redirect stderr to FIFO, so we can later decide whether we # want to read it or to redirect it to our stderr, depending # on whether the command fails or not $QEMU_NBD -v -t -b $nbd_tcp_addr -p $port --fork "$@" \ 2> "$nbd_stderr_fifo" & # Taken from common.qemu if [[ "${BASH_VERSINFO[0]}" -ge "5" || ("${BASH_VERSINFO[0]}" -ge "4" && "${BASH_VERSINFO[1]}" -ge "1") ]] then exec {nbd_fifo_fd}<"$nbd_stderr_fifo" else let _nbd_fifo_fd++ eval "exec ${_nbd_fifo_fd}<'$nbd_stderr_fifo'" fi wait $! if test $? == 0 then # Success, redirect qemu-nbd's stderr to our stderr nbd_tcp_port=$port (cat <&$nbd_fifo_fd >&2) & eval "exec $nbd_fifo_fd>&-" return fi # Failure, read the output output=$(cat <&$nbd_fifo_fd) eval "exec $nbd_fifo_fd>&-" if ! echo "$output" | grep -q "Address already in use" then # Unknown error, print it echo "$output" >&2 rm -f "$nbd_stderr_fifo" exit 1 fi done echo "Cannot find free TCP port for nbd in range 10809-10909" rm -f "$nbd_stderr_fifo" exit 1 }