# vi: ts=4 expandtab
#
#    Author: Avishai Ish-Shalom <avishai@fewbytes.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 StringIO
import ConfigParser
import cloudinit.CloudConfig as cc
import cloudinit.util as util

ruby_packages = {'1.8': ('ruby', 'rubygems', 'ruby-dev', 'libopenssl-ruby'),
        '1.9.1': ('ruby1.9.1', 'ruby1.9.1-dev', 'libruby1.9.1'),
        '1.9': ('ruby1.9', 'ruby1.9-dev', 'libruby1.9') }

def handle(name,cfg,cloud,log,args):
    # If there isn't a chef key in the configuration don't do anything
    if not cfg.has_key('chef'): return
    chef_cfg = cfg['chef']

    # Install chef packages from selected source
    install_type = util.get_cfg_option_str(chef_cfg, "install_type", "packages")
    if not os.path.isfile('/usr/bin/chef-client'):
        if install_type == "gems":
            if chef_cfg.has_key('version'):
                chef_version = chef_cfg['version']
            else:
                chef_version = None
            install_chef_from_gems(
                    util.get_cfg_option_str(chef_cfg, 'ruby_version', '1.8'),
                    chef_version)
        else:
            cc.install_packages(('chef',))

    # set the validation cert
    if chef_cfg.has_key('validation_cert'):
        with open('/etc/chef/validation.pem', 'w') as validation_cert_fh:
            validation_cert_fh.write(chef_cfg['validation_cert'])

    validation_name = chef_cfg.get('validation_name','chef-validator')
    # create the chef config from template
    util.render_to_file('chef_client.rb', '/etc/chef/client.rb',
            {'server_url': chef_cfg['server_url'], 
             'validation_name': chef_cfg['validation_name']})

    chef_args = ['-d']
    # set the firstboot json
    if chef_cfg.has_key('run_list'):
        with open('/etc/chef/firstboot.json', 'w') as firstboot_json_fh:
            firstboot_json_fh.write("{\n\"run_list\":\n[\n")
            firstboot_json_fh.write(
                    ",\n".join(["\"%s\"" % runlist_item for runlist_item in chef_cfg['run_list']])
                    )
            firstboot_json_fh.write("]\n\}")
        chef_args.append('-j /etc/chef/firstboot.json')

    # and finally, run chef
    log.debug("running chef-client %s" % chef_args)
    subprocess.check_call(['/usr/bin/chef-client'] + chef_args)

def install_chef_from_gems(ruby_version, chef_version = None):
    cc.install_packages(ruby_packages[ruby_version])
    gem_bin = get_gem_bin()
    if not os.path.exists('/usr/bin/gem'): os.symlink(gem_bin, '/usr/bin/gem')
    chef_version_arg = ""
    if chef_version: chef_version_arg = "-v %s" % chef_version
    subprocess.check_call([gem_bin,'install','chef',chef_version_arg, '--no-ri','--no-rdoc','--no-test','-q'])
    os.mkdirs('/etc/chef', '/var/log/chef', '/var/lib/chef', '/var/cache/chef', '/var/backups/chef', '/var/run/chef')
    os.symlink('/var/lib/gem/%s/bin/chef-client' % ruby_version, '/usr/bin/chef-client')
    # Ohai ruby plugin breaks if there is no ruby or gem binaries at /usr/bin, so
    try: os.symlink('/usr/bin/gem%s' % ruby_version, '/usr/bin/gem')
    except: pass
    try: os.symlink('/usr/bin/ruby%s' % ruby_version, '/usr/bin/ruby')
    except: pass

def get_gem_bin():
    return '/usr/bin/gem%s' % util.get_cfg_option_str(chef_cfg, 'ruby_version', '1.8')