# vi: ts=4 expandtab
#
#    Copyright (C) 2009-2011 Canonical Ltd.
#
#    Author: Marc Cluet <marc.cluet@canonical.com>
#    Based on code by 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/>.
import os
import pwd
import socket
import subprocess
import fileinput
import StringIO
import ConfigParser
import cloudinit.CloudConfig as cc

# Our fake header section
class FakeSecHead(object):
    def __init__(self, fp):
        self.fp = fp
        self.sechead = '[nullsection]\n'
    def readline(self):
        if self.sechead:
            try: return self.sechead
            finally: self.sechead = None
        else: return self.fp.readline()

def handle(name,cfg,cloud,log,args):
    # If there isn't a mcollective key in the configuration don't do anything
    if not cfg.has_key('mcollective'): return
    mcollective_cfg = cfg['mcollective']
    # Start by installing the mcollective package ...
    cc.install_packages(("mcollective",))

    # ... and then update the mcollective configuration
    if mcollective_cfg.has_key('conf'):
        # Create object for reading server.cfg values
        mcollective_config = ConfigParser.ConfigParser()
        # Read server.cfg values from original file in order to be able to mix the rest up
        mcollective_config.readfp(FakeSecHead(open('/etc/mcollective/server.cfg')))
        for cfg_name, cfg in mcollective_cfg['conf'].iteritems():
            # Iterate throug the config items, we'll use ConfigParser.set
            # to overwrite or create new items as needed
            for o, v in cfg.iteritems():
                mcollective_config.set(cfg_name,o,v)
        # We got all our config as wanted we'll rename
        # the previous server.cfg and create our new one
        os.rename('/etc/mcollective/server.cfg','/etc/mcollective/server.cfg.old')
        outputfile = StringIO.StringIO()
        mcollective_config.write(outputfile)
        # Now we got the whole file, write to disk except first line
        final_configfile = open('/etc/mcollective/server.cfg', 'wb')
        # Note below, that we've just used ConfigParser because it generally
        # works.  Below, we remove the initial 'nullsection' header
        # and then change 'key = value' to 'key: value'.  The global
        # search and replace of '=' with ':' could be problematic though.
        # this most likely needs fixing.
        final_configfile.write(outputfile.getvalue().replace('[nullsection]\n','').replace(' =',':'))
        final_configfile.close()

    # Start mcollective
    subprocess.check_call(['service', 'mcollective', 'start'])