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#!/usr/bin/python
#
# Copyright (C) 2014  Codethink Limited
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; version 2 of the License.
#
# 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, write to the Free Software Foundation, Inc.,
# 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
#
# This is a "morph deploy" configuration extension to configure an installer
# system. It will create the configuration needed in the installer system
# to perform an installation. It uses the following variables from the
# environment:
#
#   * INSTALLER_TARGET_STORAGE_DEVICE
#   * INSTALLER_ROOTFS_TO_INSTALL
#   * INSTALLER_POST_INSTALL_COMMAND (optional, defaults to `reboot -f`)

import os
import sys
import yaml

install_config_file = os.path.join(sys.argv[1], 'etc', 'install.conf')

try:
    installer_configuration = {
        'INSTALLER_TARGET_STORAGE_DEVICE': os.environ['INSTALLER_TARGET_STORAGE_DEVICE'],
        'INSTALLER_ROOTFS_TO_INSTALL': os.environ['INSTALLER_ROOTFS_TO_INSTALL'],
    }
except KeyError as e:
    print "Not configuring as an installer system"
    sys.exit(0)

postinstkey = 'INSTALLER_POST_INSTALL_COMMAND'
installer_configuration[postinstkey] = os.environ.get(postinstkey, 'reboot -f')

with open(install_config_file, 'w') as f:
    f.write( yaml.dump(installer_configuration, default_flow_style=False) )

print "Configuration of the installer system in %s" % install_config_file