import os
import sys
import subprocess
import shutil

import utils
from conf import conf
from conf import sf
from exceptions import MissingFile

def gen_nbscript():
	try:
		os.remove(sf(conf.nbscript))
	except OSError:
		pass

	with open(sf(conf.nbscript), 'w') as f:
		f.write('# generated novaboot script. Please don\'t edit.\n')
		f.write('load ' + sf(conf.linux_image) + ' console=ttyS0,115200\n')
		f.write('load ' + sf(conf.initram) + '\n')

def boot():
	if not os.path.isfile(conf.nbscript):
		gen_nbscript()

	sprc = subprocess.Popen([conf.novaboot, conf.nbscript] + conf.novaboot_args,
			stdout = subprocess.PIPE)