return None
        raise ex
    readfd, _, _ = select.select([sock], [], [], 0.1)
    if sock in readfd:
        _ = sock.recv(1024)
    return sock


def send_command(sock, command):
    """Sends monitor command to given socket and returns answer"""
    if sock is None:
        raise RuntimeError("None socket is passed to send_command")
    fcntl.flock(sock, fcntl.LOCK_EX)
    try:
        # There can be stray (qemu) prompt in the socket. Try to drain

            chunk = sock.recv(1024)
            if chunk == b"":
                raise IOError("Unexpected EOF from monitor")
            answer += chunk.decode("utf-8")
    finally:
        fcntl.flock(sock, fcntl.LOCK_UN)
    return answer


def spiceurl(sock):
    """Returns spice URI for given (as set of parsed args) VM"""
    output = send_command(sock, "info spice")
    url = None
    for line in output.split("\n"):
        if url is not None:

            continue
        addr_map[data[2]] = data[0]
    return addr_map


def validate_size(size):
    """Checks if size argument has proper format"""
    return re.match("[0-9]+[KMG]", size) is not None


def get_drives(vm_dir):
    """Return list of drive files in the VW directory"""
    result = []
    with open(vm_dir + "/start", "r", encoding="utf-8") as f:
        for line in f:
            if re.match("\\s*-drive .*", line) and line.find("media=disk") > -1:
                match = re.search("file=([^,\\s]*)", line)
                if match:
                    result.append(match.group(1))
    return result


def snapshot_mode(sock):
    """Returns True if VM is running in snapshot mode"""
    print("Entering snapshot_mode", file=sys.stderr)
    answer = send_command(sock, "info block")
    return re.search(": /tmp", answer) is not None


def read_netinfo(filename):
    """Reads network information from start script"""
    with open(filename, "r", encoding="utf-8") as f:
        for line in f:
            match = re.search("-net nic,(?:\\S*,)?macaddr=(\\S+) -net ([^, ]+)", line)
            if match:
                f = {"mac": match.group(1)}
                if match.group(2) == "user":
                    f["iface"] = "user"
                elif match.group(2) == "bridge":
                    f["iface"] = re.search("br=(\\S+)", line).group(1)
                else:
                    f["iface"] = "unknown"
                return f
    return {"iface": "unknown", "mac": "?", "ip": "?"}


def get_netinfo(sock):
    """Gets network information from the running VM"""
    answer = send_command(sock, "info network")
    match = re.search("bridge\\.0:.*,br=(\\S+).*macaddr=(\\S+)", answer, re.S)
    if match:
        return {"iface": match.group(1), "mac": match.group(2)}
    match = re.search("user.0:.*net=([^,]+).*\n.*macaddr=(\\S+)", answer)
    if match:
        return {"iface": "user", "ip": match.group(1), "mac": match.group(2)}
    match = re.search(
        "hub0port1:.*.br=(\\S+).*hub0port0:.*macaddr=(\\S+)", answer, flags=re.S
    )
    if match:
        return {"iface": match.group(1), "mac": match.group(2)}
    print(answer, file=sys.stderr)
    return {"iface": "unknown", "ip": "?", "mac": "?", "card": "?"}


#
# command implementation
#


def cmd_spiceuri(options):
    """vws spiceuri"""
    print(spiceurl(options.sock))


def fix_bridge_name(filename):
    """
    Checks if bridge listed in network configuration
    exists on this machine, and replaces it with default one
    from config, if not so
    """

                nxt = 1
            elif nxt == 1:
                nxt = 0
                snapshot_id = line[: line.index(" ")]
                return snapshot_id
    return None


def make_start_cmdline(options):
    """
    Append options passed from vws commandline to start script
    commandline
    """
    arg = []
    if options.cdrom:
        arg.append("-cdrom")
        arg.append(os.path.abspath(options.cdrom[0]))
    if options.snapshot:
        arg.append("-snapshot")
    if options.args:
        arg.append("".join(options.args))
    if options.password:
        os.environ["SPICE_PASSWORD"] = options.password[0]
    if arg:
        return shlex.join(arg)
    return ""


def cmd_start(options):
    """vws start"""
    if "DISPLAY" not in os.environ:
        # If cannot start GUI just don't do it.
        options.gui = False
    if options.stopped:
        arg = make_start_cmdline(options)
        cwd = os.getcwd()
        os.chdir(options.dir)
        # Check for snapshot
        snapshot_id = check_for_snapshot(options.dir)
        if snapshot_id is not None:
            arg = arg + " " + shlex.join(["-loadvm", snapshot_id])
        # Check for correct brige name
        try:
            os.stat("monitor")
        except FileNotFoundError:
            # We cannot find monitor socket. So this machine might be
            # never run on this host
            fix_bridge_name("start")
        os.system("./start %s" % arg)
        os.chdir(cwd)
        time.sleep(2)
        options.sock = connect_vm(options.dir)
        if options.sock is None:
            print("VM start failed", file=sys.stderr)
            sys.exit(1)
        if snapshot_id:

            cmd_cdrom(options)
    uri = spiceurl(options.sock)
    if options.gui:
        os.system((config.get("tools", "viewer") + "&") % uri)
    elif not options.stopped:
        print("VM already running use uri %s" % uri, file=sys.stderr)


def cmd_stop(options):
    """vws stop"""
    print("entering cmd_stop", file=sys.stderr)
    if options.hard or snapshot_mode(options.sock):
        try:
            send_command(options.sock, "quit")
        except IOError as ex:
            # Expect IOError here
            if str(ex).find("EOF from monitor"):
                print("monitor socket closed")
            else:
                raise ex
    else:
        print(send_command(options.sock, "system_powerdown"))


def cmd_monitor(options):
    """vws monitor"""
    eol = False
    try:
        print("(qemu) ", end="")
        sys.stdout.flush()

    except KeyboardInterrupt:
        if not eol:
            print("")
        eol = True
        print("Keyboard interrupt")
    if not eol:
        print("")


def cmd_reset(options):
    """vws reset"""
    print(send_command(options.sock, "system_reset"))


def cmd_save(options):
    """vws save"""
    answer = send_command(options.sock, "savevm")
    if re.search("Error", answer):
        print(answer, file=sys.stderr)
        sys.exit(1)
    else:
        options.hard = True
        cmd_stop(options)


def cmd_cdrom(options):
    """vws cdrom"""
    if options.id is None:
        # Search for devices which could be interpreted as CDROM
        devlist = send_command(options.sock, "info block")
        idx = devlist.find("info block")

            if idx != -1:
                dev_id = dev[:idx]
            options.id = dev_id
            break
    if options.id is None:
        print("No CDROM device found among:\n" + devlist, file=sys.stderr)
        return 1
    if options.eject:
        answer = send_command(options.sock, "eject " + options.id)
    elif options.file == "":
        print("Please specify either --eject or iso image", file=sys.stderr)
        return 1


    else:
        answer = send_command(
            options.sock, "change %s %s" % (options.id,
                                            os.path.abspath(options.file))
        )
    print(answer)
    return 0


def find_usb(options, devices):
    """Search for pattern or address given in options in the
    given list of devices.
    List should be produced by get_host_devices() or
    get_vm_devices()
    """
    if hasattr(options, "pattern"):
        for dev in devices:
            if re.search(options.pattern, dev[1]):
                options.address = dev[0]
                break
    elif not hasattr(options, "address"):
        print(
            "Address or search pattern for device " + "is not specified",
            file=sys.stderr,
        )
        options.sock.close()
        sys.exit(1)
    return options.address

def cmd_list(options):
    """vws list"""
    count = 0
    maxlen = 0
    vms = []
    for vmname, vmtype, dirname in all_vms(options.pattern):
        count += 1

        maxlen = max(maxlen,len(vmname))
        if options.state:
            vms.append(make_vm_listing(vmname, dirname, vmtype))
        else:
            vms.append({"name": vmname})
    if options.state:
        add_ip_address(vms)
    for f in sorted(vms, key=lambda x: x["name"]):

        name, ext = os.path.splitext(i)
        newnames[i] = name + "." + options.snapname + ext
        if os.path.exists(newnames[i]):
            print("Snapshot %s already exists", options.snapname, file=sys.stderr)
            return 1
    for i in drives:
        os.rename(i, newnames[i])
        os.system('qemu-img create -f qcow2 -b "%s" -F qcow2 "%s"' % (newnames[i], i))
        os.chmod(i, 0o664)
    return 0


def cmd_snapshots(options):
    """vws snapshots - list existing snapshots"""
    os.chdir(options.dir)

        backing = get_backing(drive)
        if not backing:
            print("Drive %s has no snapshots" % drive, file=sys.stderr)
            continue
        # Unlink current image
        os.unlink(drive)
        # create new image with same backing file
        os.system('qemu-img create -f qcow2 -b "%s" -F qcow2 "%s"' % (backing, drive))
        os.chmod(drive, 0o664)


def cmd_commit(options):
    """
    Commits last snapshot changes into it's backing file
    There would be one snapshot less for virtual machine

        if count > 0:
            time.sleep(10)


TEMPLATE = """#!/bin/sh
# Get machine name from current directory name
NAME=$(basename $(pwd))
# to enable remote access, create in the vm directory file named
# password with cleartext password
QEMU_AUDIO_DRV=spice
export QEMU_AUDIO_DRV
if [ -f "password" ]; then
   PASSWORD_SECRET="-object secret id=password,forma=raw,file=password "
   SPICE_AUTH="password-secret=password"
else
   PASSWORD_SECRET=""
   SPICE_AUTH="disable-ticketing=on,addr=127.0.0.1"
fi
SPICE_PORT=$(find_free_port 5900)
if [ "$1" = '-cdrom' ]; then
    shift
    CDROM=",file=$1"
    shift
fi
#set umask to make machine group-accessable
umask 002
{qemubinary} -name $NAME {accel} \\
-m {memory} \\
{drive} \\
{cdrom}$CDROM \\
{rtc}{net} \\
{usb} \\
{sound} \\
-chardev socket,server=on,wait=off,path=monitor,id=monitor \\
-mon chardev=monitor,mode=readline \\
-vga {vga} \\
${{PASSWORD_SECRET}} -spice port=$SPICE_PORT,$SPICE_AUTH \\
-device virtio-serial -chardev spicevmc,id=vdagent,name=vdagent \\
-device virtserialport,chardev=vdagent,name=com.redhat.spice.0 \\
-device ich9-usb-ehci1,id=usb \\
-device ich9-usb-uhci1,masterbus=usb.0,firstport=0,multifunction=on \\
-chardev spicevmc,name=usbredir,id=usbredirchardev1 \\
-device usb-redir,chardev=usbredirchardev1,id=usbredirdev1 \\
-daemonize -pidfile pid {extraargs}

    options = {
        "qemubinary": "qemu-system-x86_64",
        "accel": "-enable-kvm",
        "memory": "1024M",
        "vga": "qxl",
        "drive": "-drive media=disk,index=0,if={interface},file={image}",
        "cdrom": "-drive media=cdrom,index=2,if=ide",
        "sound": "-audio driver=spice,id=au0,model=hda",
        "group": config.get("permissions", "vm_group"),
        "usb": "-usb",
        "rtc": "",
        "extraargs": '${1:+"$@"}',
    }
    macaddr = ":".join(["52"] + ["%02x" % x for x in os.urandom(5)])
    if parsed_args.shared:

    if not parsed_args.usb:
        options["usb"] = ""

    if not parsed_args.sound:
        options["sound"] = ""
    else:
        options["sound"] = "-audio driver=spice,model=" + parsed_args.sound

    options["memory"] = parsed_args.mem
    if parsed_args.localtime:
        options["rtc"] = "-rtc base=localtime,clock=host \\\n"

    if os.path.exists(machinedir):
        if os.path.exists(os.path.join(machinedir, "start")):

        os.chdir(machinedir)
    else:
        print("Creating new image file of %s" % parsed_args.size, file=sys.stderr)
        os.chdir(machinedir)
        os.system("qemu-img create -f qcow2 %s %s" % (drivename, parsed_args.size))
    os.chmod(drivename, 0o664)
    options["drive"] = options["drive"].format(**driveopts)

    if hasattr(parsed_args, "debug") and parsed_args.debug:
        print(repr(driveopts), repr(options["drive"]))
        print(repr(options))
    with open("start", "w", encoding="utf-8") as script:
        script.write(TEMPLATE.format(**options))
    os.chmod("start", dirmode)
    # If installation media is specified vws start for new vm

                "AutoStartVMs": "/var/cache/vws/autostart",
            },
            "create options": {
                "net": "user",
                "size": "20G",
                "mem": "1G",
                "diskif": "virtio",
                "sound": "virtio",
                "arch": arch,
                "vga": "qxl",
            },
            "tools": {
                "viewer": "remote-viewer %s",
                "bridge_list": "/sbin/brctl show",
                "lsusb": "lsusb",

    )
    p.add_argument(
        "file",
        nargs="?",
        default="",
        help="ISO image or special file to connect to drive",
    )
    p.add_argument("--eject", dest="eject", action="store_const",
                   const=True, default=False)
    usb = cmds.add_parser("usb", help="manage USB devices").add_subparsers(
        dest="subcommand", help="manage USB devices"
    )
    p = new_command(usb, "insert", help="attach device to the virtual machine")
    p.add_argument("pattern", help="Pattern of device name to look up in lsusb")
    p.add_argument(
        "--address", type=str, dest="address", nargs=1, help="exact address bus:device"