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#!/usr/bin/env python3

import itertools
import subprocess
import sys
import logging


LOG = logging.getLogger(__name__)
REGISTRY = 'hub.extranet.logilab.fr/cubicweb/cubicweb'
CWREPO = 'https://hg.logilab.org/master/cubicweb'
MATRIX = [
    (['py27'], ['stretch', 'buster'], [None, '3.25', '3.26'],
        [None, 'onbuild']),
    (['py35'], ['stretch'], [None, '3.26', 'dev'], [None, 'onbuild']),
    (['py37'], ['buster'], [None, '3.26', 'dev'], [None, 'onbuild']),
]
ALIASES = (
    ('3.25', 'py27-buster-3.25'),
    ('3.26', 'py37-buster-3.26'),
    ('dev', 'py37-buster-dev'),
    ('latest', 'py37-buster-3.26'),
)


def run(*args):
    LOG.info('%s', ' '.join(args))
    return subprocess.run(args, stdout=subprocess.PIPE)


def check_call(*args):
    LOG.info('%s', ' '.join(args))
    return subprocess.check_call(args)


def check_output(*args):
    LOG.info('%s', ' '.join(args))
    return subprocess.check_output(args).decode().strip()


def _cwdev(_cache={}):
    if not _cache:
        rev = check_output('hg', 'id', '-r', 'default', CWREPO)
        _cache[None] = '{}/archive/{}.tar.gz#egg=cubicweb[pyramid]'.format(
            CWREPO, rev)
    return _cache[None]


def _tag(*args, registry=None):
    tag_part = '-'.join([x for x in args if x is not None])
    if tag_part:
        return '{}:{}'.format(registry or REGISTRY, tag_part)
    return REGISTRY


def tag_aliases():
    for alias, source in ALIASES:
        for onbuild in [None, 'onbuild']:
            if alias == 'latest' and onbuild == 'onbuild':
                tag = _tag('onbuild')
            else:
                tag = _tag(alias, onbuild)
            src = _tag(source, onbuild)
            check_call('docker', 'tag', src, tag)


def get_cubicweb_arg(cw):
    return {
        '3.25': 'cubicweb[pyramid]>=3.25,<3.26',
        '3.26': 'cubicweb[pyramid]>=3.26,<3.27',
        'dev': _cwdev(),
    }[cw]


def build_image(python, dist, cw, onbuild, no_cache=False, registry=None):
    tag = _tag(python, dist, cw, onbuild, registry=registry)
    args = {}
    dockerfile = 'Dockerfile'
    if onbuild is not None:
        dockerfile = 'Dockerfile.onbuild'
        args['FROM'] = _tag(python, dist, cw)
    elif cw is not None:
        dockerfile = 'Dockerfile.cubicweb'
        args['FROM'] = _tag(python, dist)
        args['CUBICWEB'] = get_cubicweb_arg(cw)
    else:
        args['DIST'] = dist
        args['PYTHON'] = 'python' if python == 'py27' else 'python3'
    cmd = [
        'docker', 'build', '-t', tag,
        '-f', dockerfile,
    ]
    if no_cache:
        cmd += ['--no-cache']
    for key, value in args.items():
        cmd += ['--build-arg', '{}={}'.format(key, value)]
    cmd += ['.']
    check_call(*cmd)


def green(text):
    return '\033[0;32m' + text + '\033[0m'


def red(text):
    return '\033[0;31m' + text + '\033[0m'


def build(rebuild=False):
    for matrix in MATRIX:
        for python, dist, cw, onbuild in itertools.product(*matrix):
            build_image(python, dist, cw, onbuild)
            if rebuild and cw is None and onbuild is None:
                tag = _tag(python, dist)
                out = run(
                    'docker', 'run', '--rm', '-t',
                    '--user', 'root',
                    '--entrypoint', 'check-docker-updates.sh',
                    tag, 'apt')
                if out.returncode == 1:
                    LOG.warning(red(
                        '%s debian packages updates are available: %s'),
                        tag, out.stdout)
                    build_image(python, dist, cw, onbuild, no_cache=True)
                else:
                    assert (out.returncode, out.stdout) == (0, b''), out
                    LOG.info(green('%s debian packages are up-to-date'), tag)
            if rebuild and cw is not None and onbuild is None:
                tag = _tag(python, dist, cw)
                out = run(
                    'docker', 'run', '--rm', '-t',
                    '--user', 'root',
                    '--entrypoint', 'check-docker-updates.sh',
                    tag, 'pip', get_cubicweb_arg(cw))
                if out.returncode == 1:
                    LOG.info(
                        red('%s python packages updates are available: %s'),
                        tag, out.stdout)
                    build_image(python, dist, cw, onbuild, no_cache=True)
                else:
                    assert (out.returncode, out.stdout) == (0, b''), out
                    LOG.info(green('%s python packages are up-to-date'), tag)


def push():
    for matrix in MATRIX:
        for python, dist, cw, onbuild in itertools.product(*matrix):
            tag = _tag(python, dist, cw, onbuild)
            check_call('docker', 'push', tag)
    for alias, source in ALIASES:
        for onbuild in [None, 'onbuild']:
            if alias == 'latest' and onbuild == 'onbuild':
                tag = _tag('onbuild')
            else:
                tag = _tag(alias, onbuild)
            check_call('docker', 'push', tag)


if __name__ == '__main__':
    import argparse
    logging.basicConfig(format='%(asctime)-15s %(message)s')
    LOG.setLevel(logging.INFO)
    parser = argparse.ArgumentParser(sys.argv[0])
    parser.add_argument('--registry', action='store', default=REGISTRY)
    parser.add_argument(
        '--checkrebuild', action='store_true', default=False,
        help='Rebuild images in case of outdated debian or python package')
    parser.add_argument(
        '--push', action='store_true', default=False,
        help='push images')
    args = parser.parse_args()
    REGISTRY = args.registry
    if args.push:
        push()
    else:
        build(args.checkrebuild)
        tag_aliases()