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#! /usr/bin/python
# This program is free software: you can redistribute it and/or modify it
# under the terms of the 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 warranties of
# MERCHANTABILITY, SATISFACTORY QUALITY or FITNESS FOR A PARTICULAR
# PURPOSE.  See the applicable version of 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/>.
#
# Copyright (C) 2013 Canonical, Ltd.

# TODO Install packages
# TODO allow new vendor setup from existing repo

import argparse
import logging
import os
import subprocess
from os import path

logging.basicConfig(level=logging.DEBUG)
log = logging.getLogger()
log.name = 'phablet-dev-bootstrap'

repo = {
    'cyanogenmod': 'git://phablet.ubuntu.com/CyanogenMod/android.git',
    'aosp': 'git://phablet.ubuntu.com/aosp/platform/manifest.git',
    }

repo_branch = 'phablet-trusty'
valid_vendors = ('maguro', 'mako', 'manta', 'grouper')


class StringSplitAction(argparse.Action):
    def __call__(self, parser, namespace, values, option_string=None):
        setattr(namespace, self.dest, values.split(','))


def validate_vendors(vendors):
    for vendor in vendors:
        if vendor not in valid_vendors:
            log.error('Vendor device %s not supported' % vendor)
            exit(1)


def setup_sync_dir(target_directory, continue_sync=False):
    '''Creates and changes to target directory'''
    if not continue_sync:
        try:
            if os.path.isfile(target_directory):
                raise OSError('%s is not a directory' %
                              target_directory)
            elif not os.path.isdir(target_directory):
                log.debug('Creating sync directory %s' % target_directory)
                os.mkdir(target_directory)
            elif os.listdir(target_directory):
                raise OSError('%s is not empty and not using -c' %
                              target_directory)
        except OSError as e:
            if not e.message:
                log.error('Cannot setup environment in %s' %
                          target_directory)
            else:
                log.error(e.message)
            exit(1)
    log.info('Changing to workdir %s' % target_directory)
    os.chdir(target_directory)


def sync_repository(source, branch, jobs='1', reference=None):
    '''Syncs android sources with the repo command'''
    try:
        log.info('Initializing repository')
        init_cmd = ['repo', 'init',
                    '-u', repo[source], '-b', branch]
        if reference:
            init_cmd += ['--reference', reference]
        subprocess.check_call(init_cmd)
        subprocess.check_call(['repo',
                               'sync',
                               '-j%s' % jobs]
                              )
    except subprocess.CalledProcessError:
        log.error('Error while trying to sync repository')
        exit(1)


def sync_vendors(vendors):
    cmd = '''. build/envsetup.sh'''
    for vendor in vendors:
        cmd += '; breakfast %s' % vendor
    log.debug('Executing %s' % cmd)
    subprocess.check_call(cmd, shell=True, executable='/bin/bash')


def parse_arguments():
    parser = argparse.ArgumentParser(
        description='Phablet Development Environment Setup Tool')
    parser.add_argument('-v',
                        '--vendors',
                        dest='vendors',
                        help='''Comma separated list of devices to Setup
                        such as maguro, manta, mako, grouper''',
                        action=StringSplitAction,
                        )
    parser.add_argument('-j',
                        '--jobs',
                        dest='jobs',
                        help='''Ammount of sync jobs''',
                        default='1',
                        )
    parser.add_argument('-c',
                        '--continue',
                        dest='continue_sync',
                        action='store_true',
                        help='''Continue a previously started sync''',
                        default=False,
                        )
    parser.add_argument('-r',
                        '--reference',
                        help='Use another dev environment as reference for '
                             'git',
                        default='',
                        )
    parser.add_argument('--repo-branch',
                        help='Choose branch to init from',
                        default=repo_branch,
                        )
    parser.add_argument('--sources',
                        default='cyanogenmod',
                        choices=['aosp', 'cyanogenmod'],
                        help='Use to select a different source target.',
                        )
    parser.add_argument('target_directory',
                        help='Target directory for sources',
                        )
    return parser.parse_args()


def main(args):
    if args.vendors:
        validate_vendors(args.vendors)
    setup_sync_dir(path.abspath(path.expanduser(args.target_directory)),
                   args.continue_sync)
    sync_repository(args.sources, args.repo_branch, args.jobs, args.reference)
    if args.vendors:
        sync_vendors(args.vendors)


if __name__ == "__main__":
    args = parse_arguments()
    main(args)