#!/usr/bin/python


import setns
import os

from optparse import OptionParser

parser = OptionParser()
parser.add_option("-n", "--net",
                  action="store_true", dest="netns", default=False,
                  help="Enter network namespace")
parser.add_option("-m", "--mnt",
                  action="store_true", dest="mntns", default=False,
                  help="Enter mount namespace")

(options, args) = parser.parse_args()

try:
	slice_name = args[0]
except IndexError:
	print "You must specify a vm name"
	exit(1)


try:
	cmd = 'grep %s /proc/*/cgroup | grep freezer'%slice_name
	output = os.popen(cmd).readlines()
except:
	print "Error finding slice %s"%slice_name
	exit(1)

slice_spec = None
for e in output:
	try:
		l = e.rstrip()
		path = l.split(':')[0]	
		comp = l.rsplit(':')[-1]
		slice_name_check = comp.rsplit('/')[-1]

		if (slice_name_check == slice_name):
			slice_path = path
			pid = slice_path.split('/')[2]
			cmdline = open('/proc/%s/cmdline'%pid).read().rstrip('\n\x00')
			if (cmdline == '/sbin/init'):
				slice_spec = slice_path
				break
	except:
		break

if (not slice_spec):
	print "Could not find any processes associated with %s"%slice_name


#os.closerange(0,1024)

r1 = setns.chcontext('/proc/%s/ns/utc'%pid)
r2 = setns.chcontext('/proc/%s/ns/ipc'%pid)
path = '/proc/%s/ns/net'%pid
r3 = setns.chcontext(path)
os.system('whoami')
open('/proc/lxcsu','w').write(pid)
os.system('mount none -t proc /proc')
os.execv('/bin/sh',['/bin/sh'])