os.system('qemu-img create -f qcow2 -b "%s" "%s"'%(backing,drive))

def cmd_commit(options):   
    #
    # Commits last snapshot changes into it's backing file
    #
    if options.stopped:
        #
        # Stoppend vm - last snapshot is commited into its backing file.
        # Backing file is made current drive image
        #
        os.chdir(options.dir)
        found=0
        for drive in get_drives(options.dir):
            backing=get_backing(drive)
            if backing is None:
                continue
            found=1
            os.system('qemu-img commit "%s"'%drive)
            os.unlink(drive)
            os.rename(backing,drive)
        if not found:
            print >>sys.stderr,"No snapshots exist for this VM"
            sys.exit(1)
        
    else:
        #
        #
        # Check if we are running in the snapshot mode
        # 
        answer=send_command(options.sock,"info block")
        if re.search(": /tmp",answer):
            send_command(options.sock,"commit")
        else:
            print >>sys.stderr,"VM is not running in snapshot mode"
            sys.exit(1)

    


template="""#!/bin/sh
# Get machine name from current directory name
NAME=$(basename $(pwd))

    """
    Adds a subparser and adds a machine name argument to it
    """
    p=cmds.add_parser(name,**kwargs)
    p.add_argument('machine',type=str,help='name of vm to operate on')
    return p
#
# prepare defaults for config
#

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')
# Read configration files
config.read(['/etc/vws.conf',os.environ['HOME']+'/.vwsrc'])

# Parse argument
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')