return None
    return "spice://"+url.rstrip('\r')      



def list_bridges():
    lst=[]
    with os.popen(config.get('tools','bridge_list'), "r") as f:
        for line in f:
            n = line.find('\t');
            if n <= 0:
                continue
            name = line[:n]
            if name == "bridge name":
                continue
            lst.append(name)
    return lst




#
# command implementation
#

def cmd_spiceuri(options):
    print spiceurl(options)


def cmd_start(options):
    if options.stopped:
        arg=""
        if options.cdrom:
            arg=" -cdrom "+options.cdrom[0]
        if options.snapshot:
            arg=arg+" -snapshot"
        if options.args:
            arg=arg+" "+"".join(options.args)
        print arg
        cwd=os.getcwd()
        os.chdir(options.dir)
        os.system("./start%s" % arg)
        os.chdir(cwd)
        time.sleep(2)
        options.sock = connect_vm(options.dir)
    else:
        if options.snapshot or options.args:
            print >>sys.stderr, "Cannot change qemu options. VM is already running"
        if options.cdrom:
            options.file = options.cdrom[0]
            cmd_cdrom(options)    
    if options.gui:
        uri = spiceurl(options)
        os.system((config.get('tools','viewer')+"&") % uri)
    elif not options.stopped:
        print >>sys.stderr,"VM already running"
def cmd_stop(options):
    if options.hard:
        print send_command(options.sock,'quit')
    else:
        print send_command(options.sock,'system_powerdown')

                break
    elif not hasattr("address",options):
        print >>sys.stderr,"Addess or search pattern for device is not specified"
        sys.exit(1)
    else:
        return options.address
def get_host_devices():
    global config
    f=os.popen(config.get('tools',"lsusb"),"r")
    l=[]
    for dev in f:
        m=re.match('Bus (\d+) Device (\d+): (.*)$',dev)
        if m:
            if m.group(3).endswith("root hub"):
                continue
            l.append((m.group(1)+"."+m.group(2),m.group(3)))
    f.close()
    return l
def get_vm_devices(sock):
    answer=send_command(sock,"info usb")
    l=[]
    for dev in answer.split("\n"):
        m=re.match('Device (\d+\.\d), .*?, Product (.*)$',dev)
        if m:
            l.append((m.group(1),m.group(2)))
    return l
def cmd_usb_insert(options):
    address=find_usb(options,get_host_devices())
    answer=send_command(options.sock,"usb_add host:%s" % address)
    print answer
def cmd_usb_list(options):
    for addr,descr in get_host_devices():
        print addr,": ",descr
def cmd_usb_remove(options):
    address=find_usb(options,get_vm_devices(options.sock))
    answer=send_command(options.sock,"usb_del %s" % address)
    print answer
    
def cmd_usb_attached(options):
    for t in get_vm_devices(options.sock):

    print send_command(options.sock,"wavcapture "+filename)

def cmd_stoprecord(options):
    answer = send_command(options.sock,"info capture")
    m=re.search('\[(\d+)\]: ',answer)
    if not m:
        print >>sys.stderr,"No sound recording in progress"
        sys.exit(1)
    else:
        print send_command(options.sock,"stopcapture "+m.group(1))
def cmd_version(options):
    print VERSION

def validate_size(size):
    return re.match('\d+[KMG]',size) is not None

    p=cmds.add_parser(name,**kwargs)
    p.add_argument('machine',type=str,help='name of vm to operate on')
    return p
#
# arg parsing
#

arch=os.uname()[4]
if re.match("i[3-9]86",arch):
    arch="i386"
elif arch.startswith("arm"):
    arch="arm"
config=ConfigParser({'SharedVMs':'/var/cache/vws/shared',
    'AutoStartVMs':'/var/cache/vws/autostart'})
config.add_section('directories')
config.add_section('create options')
for option,value in [('net','user'),('size','20G'),('mem','1G'),
        ('diskif','virtio'),('sound','hda'),('arch',arch),
        ('vga','qxl')]:
    config.set('create options',option,value)
config.add_section('tools')
config.set('tools','viewer','remote-viewer %s')
config.set('tools','bridge_list','/sbin/brctl show')
config.set('tools','lsusb','lsusb')
config.read(['/etc/vws.conf',os.environ['HOME']+'/.vwsrc'])
print config
args=ArgumentParser(description="Manage Virtual Workstations")
cmds=args.add_subparsers(dest='command',help="sub-command help")
p=cmds.add_parser("list",help="List existing VWs",description="List existing VWs")
p.add_argument("--state",action='store_const',const=True,default=False,
                dest='state',help='Show state of the machine')
p.add_argument("--addr",action='store_const',const=True,default=False,
                dest='addr',help='Show mac address and spice port')

p.add_argument('filename',help='PPM image filename to write screenshot to')
p=new_command(cmds,'record',help='Record audio output from VM')
p.add_argument('filename',help='wav file to record autdio to')
new_command(cmds,'stoprecord',help='stop recording audio')
# Create new VM
p=new_command(cmds,'create',help="Create new VW")
p.add_argument("--no-usb",help="Disable USB controller",action='store_const', const = False, default=True, dest="usb")
p.add_argument("--size",metavar='size',help="Size of primary disk images",
    dest="size",default=config.get('create options','size'));
p.add_argument("--arch",metavar='cputype',help="Emulated architecture",
    dest="arch", default=config.get('create options','arch'));
p.add_argument("--no-sound",help="Disable sound card", action='store_const',
    const=None, default=config.get('create options', 'sound'), dest="sound")
p.add_argument("--sound",metavar='cardtype',help="Specify sound card type",
    dest='sound',default=config.get('create options','sound'))
p.add_argument("--vga",metavar='cardtype',
  help="specify video card type (cirrus,std,vmwae,qxl) default qxl",
   dest="vga",default=config.get('create options','vga'))
p.add_argument("--net",help="Network - 'user' or bridge name",
   dest='net',default=config.get('create options','net'))
p.add_argument("--mem",metavar='size',help="Size of memory",
    dest="mem",default=config.get('create options','mem'))
p.add_argument("--diskif",metavar='interface-type',
    help="Disk interface (virtio, scsi, ide)",choices=['virtio','scsi','ide'],
    dest="diskif",default=config.get('create options','diskif'))
p.add_argument('--shared',help='Create shared VW instead of private one',
    action='store_const',const= True,dest='shared',default=False)
p.add_argument('--image',metavar='filename',help='Existing disk image to import',
    dest='image',default=None)
p.add_argument('--install',metavar='filename.iso',
    help='ISO image to install OS from',dest='install',default=None)
# Miscellenia
p=new_command(cmds,'monitor',help='connect stdin/stdout to monitor of VM')
p=new_command(cmds,'spiceuri',help='Output spice URI of machine')

parsed_args=args.parse_args(sys.argv[1:])

# Create command is totally different, so it is handled separately