# vi: ts=4 expandtab
#
#    Copyright (C) 2009-2010 Canonical Ltd.
#
#    Author: Scott Moser <scott.moser@canonical.com>
#
#    This program is free software: you can redistribute it and/or modify
#    it under the terms of the GNU General Public License version 3, as
#    published by the Free Software Foundation.
#
#    This program is distributed in the hope that it will be useful,
#    but WITHOUT ANY WARRANTY; without even the implied warranty of
#    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
#    GNU General Public License for more details.
#
#    You should have received a copy of the GNU General Public License
#    along with this program.  If not, see <http://www.gnu.org/licenses/>.
from cloudinit.CloudConfig import per_instance
from cloudinit import util
import subprocess
import os.path
import shutil

frequency = per_instance
tz_base = "/usr/share/zoneinfo"

def handle(name,cfg,cloud,log,args):
    if len(args) != 0:
        timezone = args[0]
    else:
        timezone = util.get_cfg_option_str(cfg,"timezone",False)

    if not timezone: return

    tz_file = "%s/%s" % (tz_base , timezone)

    if not os.path.isfile(tz_file):
        log.debug("Invalid timezone %s" % tz_file)
        raise Exception("Invalid timezone %s" % tz_file)

    try:
        fp=open("/etc/timezone","wb")
        fp.write("%s\n" % timezone)
        fp.close()
    except:
        log.debug("failed to write to /etc/timezone")
        raise

    try:
        shutil.copy(tz_file, "/etc/localtime")
    except:
        log.debug("failed to copy %s to /etc/localtime" % tz_file)
        raise
        
    log.debug("set timezone to %s" % timezone)
    return