#!/usr/bin/python
from ConfigParser import ConfigParser
from argparse import ArgumentParser,Namespace
import fcntl
import socket,select
import errno
import re
import os,sys,time
VERSION=0.2
def find_vm(name):

    "drive":"-drive media=disk,index=0,if={interface},file={image}",
    "cdrom":"-drive media=cdrom,index=2,if=ide",
    "sound":"-soundhw hda",
    "usb":"-usb"}
    macaddr=":".join(map(lambda x: "%02x"%ord(x),chr(0x52)+os.urandom(5)))

    if parsed_args.shared:
        machinedir = config.get("directories","SharedVMs")+"/"+parsed_args.machine
        dirmode = 0755
    else:
        machinedir = os.environ["HOME"]+"/VWs/"+parsed_args.machine
        dirmode = 0775

    if parsed_args.net != 'user':
        bridges = list_bridges()
        if not parsed_args.net in bridges:
            print >>sys.stderr,"No such bridge %s. Available ones %s"%(parsed_args.net,", ".join(bridges))
            sys.exit(1)
        options["net"]="-net nic,macaddr=%s -net bridge,br=%s"%(macaddr,parsed_args.net)
        
    else:
        options["net"]="-net nic,macaddr=%s -net user"%(macaddr,)

    options["qemubinary"] = 'qemu-system-'+parsed_args.arch
    options["vga"]=parsed_args.vga
    if not parsed_args.arch in ('i386','x86_64'):
        print >>sys.stderr,"KVM acceleration disabled due to target architecture"
        options.accel = ''
    elif not os.access("/dev/kvm",os.W_OK):
        print >>sys.stderr,"KVM acceleration disabled due to unavailability on the host system"

    else:
        options["sound"]='-soundhw '+parsed_args.sound

    options["memory"]=parsed_args.mem

    if os.path.exists(machinedir):
        if os.path.exists(machinedir+"/start"):
            print >> sys.stderr,"Virtual Worstation %s already exists"%parsed_args.machine
        else:
            print >> sys.stderr,"Cannot create VW directory, something on the way"
        sys.exit(1)
    #  Creating directory for VM
    os.makedirs(machinedir,dirmode)
    driveopts={"interface":parsed_args.diskif,"image":drivename}
    if parsed_args.image:
        # Copying image file
        print >>sys.stderr,"Copying %s to %s"%(parsed_args.image,machinedir+"/"+drivename) 
        os.system("qemu-img convert -O qcow2 -p %s %s/%s"%(parsed_args.image,machinedir+"/"+drivename))
        os.chdir(machinedir)
    else:
        print >>sys.stderr,"Creating new image file"
        os.chdir(machinedir)
        os.system("qemu-img create  -f qcow2 %s %s"%(drivename,parsed_args.size))

    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") as script:
        script.write(template.format(**options))

    os.chmod('start',0755)

    # If installation media is specified vws start for new vm
    if parsed_args.install:
        start_opts=Namespace(machine=parsed_args.machine,
                            command='start', cdrom=[parsed_args.install],
                            dir=machinedir, stopped=True, snapshot=False,
                            args="", gui=True 
                           )
        cmd_start(start_opts)




#
# Utility functions for arg parsing