#!/usr/bin/python

import os, sys, time, traceback
import subprocess

Popen = subprocess.Popen

def usage():
	sys.stderr.write("""\
Usage:
  startvm <vmname>
""")

def run():
	if len(sys.argv) != 2:
		usage()
		return

	vmstart = sys.argv[1]
	fd = open('/srv/vmlist', 'r')
	found = False
	for l in fd:
		l = l.strip()
		if not l:
			continue
		name, mac, port, autostart = l.split()
		if name == vmstart:
			found = True
			break

	if not found:
		sys.stderr.write("No VM with that name\n\n")
		usage()
		return
	
	try:
		os.mkdir("/var/run/vbox")
	except OSError:
		pass

	pidfile = "/var/run/vbox/%s" % (name,)
	if os.path.exists(pidfile):
		fdpid = open(pidfile, "r")
		oldpid = int(fdpid.read())
		fdpid.close()
		procfile = "/proc/%s/cmdline" % (oldpid,)
		if os.path.exists(procfile):
			fdcmd = open(procfile, "r")
			oldcmd = fdcmd.read().replace('\x00', ' ')
			fdcmd.close()
			sys.stderr.write("Already running: PID %s, CMD %s\n" % (oldpid, oldcmd))
			return

	fdo = open("/var/log/vbox/%s.log" % (name,), "a")
	fdo.write("--- Starting VirtualBox at %s ---\n" % (time.strftime("%Y-%m-%d %H:%M:%S"),))
	fdpid = open(pidfile, "w")
	p = Popen(["vboxheadless", "-s", name, "-n", "-m", port], stdout=fdo, stderr=fdo)
	fdpid.write(str(p.pid))
	fdpid.close()



if __name__ == "__main__":
	run()