#!/usr/bin/python3

# flatdeb — build Flatpak runtimes from Debian packages
#
# Copyright © 2016-2017 Simon McVittie
# Copyright © 2017 Collabora Ltd.
#
# Partially derived from vectis, copyright © 2015-2017 Simon McVittie
#
# SPDX-License-Identifier: MIT
#
# Permission is hereby granted, free of charge, to any person obtaining
# a copy of this software and associated documentation files (the
# "Software"), to deal in the Software without restriction, including
# without limitation the rights to use, copy, modify, merge, publish,
# distribute, sublicense, and/or sell copies of the Software, and to
# permit persons to whom the Software is furnished to do so, subject to
# the following conditions:
#
# The above copyright notice and this permission notice shall be included
# in all copies or substantial portions of the Software.
#
# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
# EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
# MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
# IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
# CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
# TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
# SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

"""
Create Flatpak runtimes from Debian packages.
"""

import argparse
import json
import logging
import os
import re
import shutil
import subprocess
import sys
import urllib.parse
from contextlib import ExitStack
from tempfile import TemporaryDirectory

import yaml
from gi.repository import GLib

try:
    import typing
except ImportError:
    pass
else:
    typing  # silence "unused" warnings


logger = logging.getLogger('flatdeb')


# TODO: When flatdeb is packaged/released, replace this with the released
# version in packages/releases
VERSION = None

if VERSION is None:
    _git_version = subprocess.check_output([
        'sh', '-c',
        'cd "$(dirname "$1")" && '
        'git describe '
        '--always '
        '--dirty '
        '--first-parent '
        '--long '
        '--tags '
        '--match="v[0-9]*" '
        '2>/dev/null || :',
        'sh',
        sys.argv[0],
    ])[1:].decode('utf-8').strip()
    VERSION = _git_version

_DEBOS_BASE_RECIPE = os.path.join(
    os.path.dirname(__file__), 'flatdeb', 'debos-base.yaml')
_DEBOS_RUNTIMES_RECIPE = os.path.join(
    os.path.dirname(__file__), 'flatdeb', 'debos-runtimes.yaml')


class AptSource:
    def __init__(
        self,
        kind,                       # type: str
        uri,                        # type: str
        suite,                      # type: str
        components=('main',),       # type: typing.Sequence[str]
        trusted=False
    ):
        self.kind = kind
        self.uri = uri
        self.suite = suite
        self.components = components
        self.trusted = trusted

    def __eq__(self, other):
        # type: (typing.Any) -> bool
        if not isinstance(other, AptSource):
            return False

        if self.kind != other.kind:
            return False

        if self.uri != other.uri:
            return False

        if self.suite != other.suite:
            return False

        if set(self.components) != set(other.components):
            return False

        if self.trusted != other.trusted:
            return False

        return True

    @classmethod
    def multiple_from_string(
        cls,        # type: typing.Type[AptSource]
        line,       # type: str
    ):
        # type: (...) -> typing.Iterable[AptSource]
        line = line.strip()
        tokens = line.split()

        if tokens[0] in ('deb', 'deb-src'):
            return (cls.from_string(line),)
        elif tokens[0] == 'both':
            return (
                cls.from_string('deb' + line[4:]),
                cls.from_string('deb-src' + line[4:]),
            )
        else:
            raise ValueError(
                'apt sources must start with "deb ", "deb-src " or "both "')

    @classmethod
    def from_string(
        cls,        # type: typing.Type[AptSource]
        line,       # type: str
    ):
        # type: (...) -> AptSource
        tokens = line.split()
        trusted = False

        if len(tokens) < 4:
            raise ValueError(
                'apt sources must be specified in the form '
                '"deb http://URL SUITE COMPONENT [COMPONENT...]"')

        if tokens[0] not in ('deb', 'deb-src'):
            raise ValueError(
                'apt sources must start with "deb " or "deb-src "')

        if tokens[1] == '[trusted=yes]':
            trusted = True
            tokens = [tokens[0]] + tokens[2:]
        elif tokens[1].startswith('['):
            raise ValueError(
                'The only apt source option supported is [trusted=yes]')

        return cls(
            kind=tokens[0],
            uri=tokens[1],
            suite=tokens[2],
            components=tokens[3:],
            trusted=trusted,
        )

    def __str__(self):
        # type: () -> str
        if self.trusted:
            maybe_options = ' [trusted=yes]'
        else:
            maybe_options = ''

        return '%s%s %s %s %s' % (
            self.kind,
            maybe_options,
            self.uri,
            self.suite,
            ' '.join(self.components),
        )


class Builder:

    """
    Main object
    """

    __multiarch_tuple_cache = {}    # type: typing.Dict[str, str]

    def __init__(self):
        # type: () -> None

        #: The Debian suite to use
        self.apt_suite = 'stretch'
        #: The Flatpak branch to use for the runtime, or None for apt_suite
        self.runtime_branch = None      # type: typing.Optional[str]
        #: The Flatpak branch to use for the app
        self.app_branch = None          # type: typing.Optional[str]
        #: The freedesktop.org cache directory
        self.xdg_cache_dir = os.getenv(
            'XDG_CACHE_HOME', os.path.expanduser('~/.cache'))
        #: Where to write output
        self.build_area = os.path.join(
            self.xdg_cache_dir, 'flatdeb',
        )
        self.ostree_repo = os.path.join(self.build_area, 'ostree-repo')

        self.__dpkg_archs = []      # type: typing.Sequence[str]
        self.flatpak_arch = None    # type: typing.Optional[str]

        self.__primary_dpkg_arch_matches_cache = {
        }       # type: typing.Dict[str, bool]
        self.suite_details = {}         # type: typing.Dict[str, typing.Any]
        self.runtime_details = {}       # type: typing.Dict[str, typing.Any]
        self.ostree_commit = True
        self.ostree_mode = 'archive-z2'
        self.export_bundles = False
        self.sources_required = set()   # type: typing.Set[str]
        self.strip_source_version_suffix = None
        self.apt_keyrings = []          # type: typing.List[str]
        #: apt sources to use when building the runtime
        self.build_apt_sources = []     # type: typing.List[AptSource]
        #: apt sources to leave in /etc/apt/sources.list afterwards
        self.final_apt_sources = []     # type: typing.List[AptSource]
        self.build_id = None
        self.variant_name = None
        self.variant_id = None
        self.sdk_variant_name = None
        self.sdk_variant_id = None

        self.logger = logger.getChild('Builder')

    @staticmethod
    def yaml_dump_one_line(
        data,               # type: typing.Any
        stream=None,        # type: ignore
    ):
        # type: (...) -> typing.Optional[str]
        return yaml.safe_dump(
            data,
            stream=stream,
            default_flow_style=True,
            width=0xFFFFFFFF,
        ).replace('\n', ' ')

    @staticmethod
    def get_flatpak_arch(arch=None):
        # type: (typing.Optional[str]) -> str
        """
        Return the Flatpak architecture name corresponding to uname
        result arch.

        If arch is None, return the Flatpak architecture name
        corresponding to the machine where this script is running.
        """

        if arch is None:
            arch = os.uname()[4]

        if re.match(r'^i.86$', arch):
            return 'i386'
        elif re.match(r'^arm.*', arch):
            if arch.endswith('b'):
                return 'armeb'
            else:
                return 'arm'
        elif arch in ('mips', 'mips64'):
            import struct
            if struct.pack('i', 1).startswith(b'\x01'):
                return arch + 'el'

        return arch

    @staticmethod
    def other_multiarch(arch):
        # type: (str) -> typing.Optional[str]
        """
        Return the other architecture that accompanies the given Debian
        architecture in a multiarch setup, or None.
        """

        if arch == 'amd64':
            return 'i386'
        elif arch == 'arm64':
            return 'armhf'
        else:
            return None

    @staticmethod
    def multiarch_tuple(arch):
        # type: (str) -> str
        """
        Return the multiarch tuple for the given dpkg architecture name.
        """

        if arch not in Builder.__multiarch_tuple_cache:
            Builder.__multiarch_tuple_cache[arch] = subprocess.check_output([
                'dpkg-architecture',
                '-qDEB_HOST_MULTIARCH',
                '-a{}'.format(arch),
            ]).decode('utf-8').strip()

        return Builder.__multiarch_tuple_cache[arch]

    @staticmethod
    def dpkg_to_flatpak_arch(arch):
        # type: (str) -> str
        """
        Return the Flatpak architecture name corresponding to the given
        dpkg architecture name.
        """

        if arch == 'amd64':
            return 'x86_64'
        elif arch == 'arm64':
            return 'aarch64'
        elif arch in ('armel', 'armhf'):
            return 'arm'
        elif arch == 'powerpc':
            return 'ppc'
        elif arch == 'powerpc64':
            return 'ppc64'
        elif arch == 'powerpcel':
            return 'ppcle'
        elif arch == 'ppc64el':
            return 'ppc64le'

        return arch

    @property
    def primary_dpkg_arch(self):
        # type: () -> str
        """
        The Debian architecture we are building a runtime for, such as
        i386 or amd64.
        """
        return self.__dpkg_archs[0]

    @property
    def dpkg_archs(self):
        # type: () -> typing.Sequence[str]
        """
        The Debian architectures we support via multiarch, such as
        ['amd64', 'i386'].
        """
        return self.__dpkg_archs

    @dpkg_archs.setter
    def dpkg_archs(self, value):
        # type: (typing.Sequence[str]) -> None
        self.__primary_dpkg_arch_matches_cache = {}
        self.__dpkg_archs = value

    def primary_dpkg_arch_matches(self, arch_spec):
        # type: (str) -> bool
        """
        Return True if arch_spec matches primary_dpkg_arch (or
        equivalently, if primary_dpkg_arch is one of the architectures
        described by arch_spec). For example, any-amd64 matches amd64
        but not i386.
        """
        if arch_spec not in self.__primary_dpkg_arch_matches_cache:
            exit_code = subprocess.call(
                ['dpkg-architecture', '--host-arch', self.primary_dpkg_arch,
                 '--is', arch_spec])
            self.__primary_dpkg_arch_matches_cache[arch_spec] = (
                exit_code == 0
            )

        return self.__primary_dpkg_arch_matches_cache[arch_spec]

    def run_command_line(self):
        # type: () -> None
        """
        Run appropriate commands for the command-line arguments
        """
        parser = argparse.ArgumentParser(
            description='Build Flatpak runtimes',
        )
        parser.add_argument('--chdir', default=None)
        parser.add_argument(
            '--ostree-mode', default=self.ostree_mode,
        )
        parser.add_argument(
            '--export-bundles', action='store_true', default=False,
        )
        parser.add_argument('--build-area', default=self.build_area)
        parser.add_argument('--ostree-repo', default=self.ostree_repo)
        parser.add_argument(
            '--ostree-commit', action='store_true', default=self.ostree_commit,
        )
        parser.add_argument(
            '--no-ostree-commit', dest='ostree_commit', action='store_false',
        )
        parser.add_argument('--suite', '-d', default=self.apt_suite)
        parser.add_argument('--architecture', '--arch', '-a')
        parser.add_argument('--runtime-branch', default=self.runtime_branch)
        parser.add_argument('--version', action='store_true')
        parser.add_argument(
            '--replace-apt-source', action='append', default=[])
        parser.add_argument(
            '--remove-apt-source', action='append', default=[])
        parser.add_argument(
            '--add-apt-source', action='append', default=[])
        parser.add_argument(
            '--replace-build-apt-source', action='append', default=[])
        parser.add_argument(
            '--remove-build-apt-source', action='append', default=[])
        parser.add_argument(
            '--add-build-apt-source', action='append', default=[])
        parser.add_argument(
            '--replace-final-apt-source', action='append', default=[])
        parser.add_argument(
            '--remove-final-apt-source', action='append', default=[])
        parser.add_argument(
            '--add-final-apt-source', action='append', default=[])
        parser.add_argument(
            '--add-apt-keyring', action='append', default=[])
        parser.add_argument(
            '--generate-sysroot-tarball', action='store_true')
        parser.add_argument(
            '--build-id', default=None)
        parser.add_argument(
            '--variant-name', default=None)
        parser.add_argument(
            '--variant-id', default=None)
        parser.add_argument(
            '--sdk-variant-name', default=None)
        parser.add_argument(
            '--sdk-variant-id', default=None)
        subparsers = parser.add_subparsers(dest='command', metavar='command')

        subparser = subparsers.add_parser(
            'base',
            help='Build a fresh base tarball',
        )

        subparser = subparsers.add_parser(
            'runtimes',
            help='Build runtimes',
        )
        subparser.add_argument('yaml_file')

        subparser = subparsers.add_parser(
            'app',
            help='Build an app',
        )
        subparser.add_argument('--app-branch', default=self.app_branch)
        subparser.add_argument('yaml_manifest')

        subparser = subparsers.add_parser(
            'print-flatpak-architecture',
            help='Print the Flatpak architecture',
        )

        args = parser.parse_args()

        for replacement in args.replace_apt_source:
            if '=' not in replacement:
                parser.error(
                    '--replace-apt-source argument must be in the form '
                    '"LABEL=deb http://ARCHIVE SUITE COMPONENT[...]"')

        if args.version:
            print('flatdeb {}'.format(VERSION))
            return

        if args.chdir is not None:
            os.chdir(args.chdir)

        self.build_area = args.build_area
        self.build_id = args.build_id
        self.variant_name = args.variant_name
        self.variant_id = args.variant_id
        self.sdk_variant_name = args.sdk_variant_name
        self.sdk_variant_id = args.sdk_variant_id
        self.apt_suite = args.suite
        self.runtime_branch = args.runtime_branch
        self.ostree_commit = args.ostree_commit
        self.ostree_repo = args.ostree_repo
        self.export_bundles = args.export_bundles
        self.ostree_mode = args.ostree_mode

        if self.export_bundles and not self.ostree_commit:
            parser.error(
                '--export-bundles and --no-ostree-commit cannot '
                'work together')

        if args.architecture is None:
            self.dpkg_archs = [
                subprocess.check_output(
                    ['dpkg-architecture', '-q', 'DEB_HOST_ARCH'],
                ).decode('utf-8').rstrip('\n')
            ]
        else:
            self.dpkg_archs = args.architecture.split(',')

        self.flatpak_arch = self.dpkg_to_flatpak_arch(self.primary_dpkg_arch)

        self.ensure_build_area()

        if self.ostree_repo:
            os.makedirs(os.path.dirname(self.ostree_repo), exist_ok=True)

        if args.command is None:
            parser.error('A command is required')

        with open(
                os.path.join('suites', self.apt_suite + '.yaml'),
                encoding='utf-8') as reader:
            self.suite_details = yaml.safe_load(reader)

        self.strip_source_version_suffix = self.suite_details.get(
            'strip_source_version_suffix', '')

        self.build_apt_sources = self.generate_apt_sources(
            add=args.add_apt_source + args.add_build_apt_source,
            replace=args.replace_apt_source + args.replace_build_apt_source,
            remove=args.remove_apt_source + args.remove_build_apt_source,
            for_build=True,
        )
        self.final_apt_sources = self.generate_apt_sources(
            add=args.add_apt_source + args.add_final_apt_source,
            replace=args.replace_apt_source + args.replace_final_apt_source,
            remove=args.remove_apt_source + args.remove_final_apt_source,
            for_build=False,
        )

        for addition in args.add_apt_keyring:
            self.apt_keyrings.append(addition)

        if self.build_apt_sources[0].kind != 'deb':
            parser.error('First apt source must provide .deb packages')

        getattr(
            self, 'command_' + args.command.replace('-', '_'))(**vars(args))

    def generate_apt_sources(
        self,
        add=(),         # type: typing.Sequence[str]
        replace=(),     # type: typing.Sequence[str]
        remove=(),      # type: typing.Sequence[str]
        for_build=False
    ):
        # type: (...) -> typing.List[AptSource]

        apt_sources = []        # type: typing.List[AptSource]

        for source in self.suite_details['sources']:
            keyring = source.get('keyring')

            if keyring is not None:
                self.apt_keyrings.append(keyring)

            uri = source['apt_uri']
            suite = source.get('apt_suite', self.apt_suite)
            suite = suite.replace('*', self.apt_suite)
            components = source.get(
                'apt_components',
                self.suite_details.get('apt_components', ['main'])
            )
            trusted = source.get('apt_trusted', False)

            if 'label' in source:
                replaced = False

                for replacement in reversed(replace):
                    key, value = replacement.split('=', 1)

                    if key == source['label']:
                        apt_sources.extend(
                            AptSource.multiple_from_string(value))
                        replaced = True
                        break

                if replaced or source['label'] in remove:
                    continue

            if for_build:
                if not source.get('for_build', True):
                    continue
            else:
                if not source.get('for_final', True):
                    continue

            if source.get('deb', True):
                apt_sources.append(AptSource(
                    'deb', uri, suite,
                    components=components,
                    trusted=trusted,
                ))

            if source.get('deb-src', True):
                apt_sources.append(AptSource(
                    'deb-src', uri, suite,
                    components=components,
                    trusted=trusted,
                ))

        for addition in add:
            apt_sources.extend(AptSource.multiple_from_string(addition))

        return apt_sources

    def command_print_flatpak_architecture(self, **kwargs):
        # type: (...) -> None
        print(self.flatpak_arch)

    def ensure_build_area(self):
        # type: () -> None
        os.makedirs(self.xdg_cache_dir, 0o700, exist_ok=True)
        os.makedirs(self.build_area, 0o755, exist_ok=True)
        os.makedirs(os.path.join(self.build_area, 'tmp'), exist_ok=True)

    def command_base(self, **kwargs):
        # type: (...) -> None
        with ExitStack() as stack:
            scratch = stack.enter_context(
                TemporaryDirectory(prefix='flatdeb.')
            )
            self.ensure_build_area()

            # debootstrap only supports one suite, so we use the first
            apt_suite = self.build_apt_sources[0].suite
            dest_recipe = os.path.join(scratch, 'flatdeb.yaml')
            shutil.copyfile(_DEBOS_BASE_RECIPE, dest_recipe)

            for helper in (
                'add-foreign-architectures',
                'clean-up-base',
                'clean-up-before-pack',
                'disable-services',
                'set-build-id',
                'usrmerge',
                'write-manifest',
            ):
                dest = os.path.join(scratch, helper)
                shutil.copyfile(
                    os.path.join(
                        os.path.dirname(__file__),
                        'flatdeb',
                        helper,
                    ),
                    dest,
                )
                os.chmod(dest, 0o755)

            os.makedirs(
                os.path.join(
                    scratch, 'suites', apt_suite, 'overlay', 'etc',
                    'apt', 'trusted.gpg.d',
                ),
                0o755,
                exist_ok=True,
            )

            tarball = 'base-{}-{}.tar.gz'.format(
                self.apt_suite,
                ','.join(self.dpkg_archs),
            )
            output = os.path.join(self.build_area, tarball)

            script = self.suite_details.get('debootstrap_script')

            if script is not None:
                # TODO: flatdeb has historically used a configurable
                # debootstrap_script, but debos doesn't support scripts other
                # than 'unstable'. Does the Debian script work for precise and
                # produce the same results as the 'precise' script?
                # https://github.com/go-debos/debos/issues/16
                logger.debug(
                    'Ignoring /usr/share/debootstrap/scripts/%s', script)

            self.configure_apt(
                os.path.join(scratch, 'suites', apt_suite, 'overlay'),
                self.build_apt_sources,
            )

            argv = [
                'debos',
                '--artifactdir={}'.format(self.build_area),
                '-t', 'architecture:{}'.format(self.primary_dpkg_arch),
                '-t', 'suite:{}'.format(apt_suite),
                '-t', 'mirror:{}'.format(
                    self.build_apt_sources[0].uri,
                ),
                '-t', 'ospack:{}'.format(tarball + '.new'),
                '-t', 'artifact_prefix:base-{}-{}'.format(
                    self.apt_suite,
                    ','.join(self.dpkg_archs),
                ),
                '-t', 'foreignarchs:{}'.format(
                    ' '.join(self.dpkg_archs[1:]),
                ),
                '-t', 'mergedusr:{}'.format(
                    str(
                        self.suite_details.get('can_merge_usr', False),
                    ).lower(),
                ),
            ]

            if self.build_id is not None:
                argv.append('-t')
                argv.append('build_id:{}'.format(self.build_id))

            if self.variant_name is not None:
                argv.append('-t')
                argv.append('variant:{}'.format(self.variant_name))

            if self.variant_id is not None:
                argv.append('-t')
                argv.append('variant_id:{}'.format(
                    self.escape_variant_id(self.variant_id)
                ))

            for keyring in self.apt_keyrings:
                if os.path.exists(os.path.join('suites', keyring)):
                    keyring = os.path.join('suites', keyring)
                elif os.path.exists(keyring):
                    pass
                else:
                    raise RuntimeError('Cannot open {}'.format(keyring))

                dest = os.path.join(
                    scratch, 'suites', apt_suite, 'overlay',
                    'etc', 'apt', 'trusted.gpg.d',
                    os.path.basename(keyring),
                )
                shutil.copyfile(keyring, dest)

                argv.append('-t')
                argv.append(
                    'keyring:suites/{}/overlay/etc/apt/trusted.gpg.d/'
                    '{}'.format(
                        apt_suite,
                        os.path.basename(keyring),
                    )
                )

                # debootstrap only supports one keyring and one apt source,
                # so we take the first one
                break

            components = self.build_apt_sources[0].components

            if components:
                argv.append('-t')
                argv.append('components:{}'.format(
                    self.yaml_dump_one_line(components)))

            argv.append(dest_recipe)
            subprocess.check_call(argv)

            os.rename(output + '.new', output)

    def ensure_local_repo(self):
        # type: () -> None
        os.makedirs(os.path.dirname(self.ostree_repo), 0o755, exist_ok=True)
        subprocess.check_call([
            'ostree',
            '--repo=' + self.ostree_repo,
            'init',
            '--mode={}'.format(self.ostree_mode),
        ])

    def escape_variant_id(self, variant_id):
        # type: (str) -> str
        """
        Return a version of the variant_id that fits in the restricted
        character set documented in os-release(5).
        """
        buf = bytearray(variant_id.lower(), 'ascii', 'replace')

        for i, b in enumerate(buf):
            c = chr(b)

            if not c.isalnum() and c not in '._-':
                buf[i] = ord('_')

        return buf.decode('ascii')

    def command_runtimes(
        self,
        *,
        yaml_file,                          # type: str
        generate_sysroot_tarball=False,
        **kwargs
    ):
        # type: (...) -> None
        if self.ostree_commit:
            self.ensure_local_repo()

        if self.runtime_branch is None:
            self.runtime_branch = self.apt_suite

        with open(yaml_file, encoding='utf-8') as reader:
            self.runtime_details = yaml.safe_load(reader)

        tarball = 'base-{}-{}.tar.gz'.format(
            self.apt_suite,
            ','.join(self.dpkg_archs),
        )

        with ExitStack() as stack:
            scratch = stack.enter_context(
                TemporaryDirectory(prefix='flatdeb.')
            )
            self.ensure_build_area()

            dest_recipe = os.path.join(scratch, 'flatdeb.yaml')
            shutil.copyfile(_DEBOS_RUNTIMES_RECIPE, dest_recipe)

            for helper in (
                'apt-install',
                'clean-up-base',
                'clean-up-before-pack',
                'collect-source-code',
                'dbgsym-use-build-id',
                'disable-services',
                'make-flatpak-friendly',
                'platformize',
                'prepare-runtime',
                'purge-conffiles',
                'put-ldconfig-in-path',
                'set-build-id',
                'symlink-alternatives',
                'usrmerge',
                'write-manifest',
            ):
                dest = os.path.join(scratch, helper)
                shutil.copyfile(
                    os.path.join(
                        os.path.dirname(__file__),
                        'flatdeb',
                        helper,
                    ),
                    dest,
                )
                os.chmod(dest, 0o755)

            prefix = self.runtime_details['id_prefix']

            # Do the Platform first, because we download its source
            # packages as part of preparing the Sdk
            for sdk in (False, True):
                packages = list(self.runtime_details.get('add_packages', []))

                for p in self.runtime_details.get(
                    'add_packages_multiarch', []
                ):
                    for a in self.dpkg_archs:
                        packages.append(p + ':' + a)

                if sdk:
                    runtime = prefix + '.Sdk'
                else:
                    runtime = prefix + '.Platform'

                artifact_prefix = '{}-{}-{}'.format(
                    runtime,
                    ','.join(self.dpkg_archs),
                    self.runtime_branch,
                )
                ostree_prefix = artifact_prefix + '-runtime'
                out_tarball = ostree_prefix + '.tar.gz'

                argv = [
                    'debos',
                    '--artifactdir={}'.format(self.build_area),
                    '--scratchsize=8G',
                    '-t', 'architecture:{}'.format(self.primary_dpkg_arch),
                    '-t', 'flatpak_arch:{}'.format(self.flatpak_arch),
                    '-t', 'suite:{}'.format(self.apt_suite),
                    '-t', 'ospack:{}'.format(tarball),
                    '-t', 'artifact_prefix:{}'.format(artifact_prefix),
                    '-t', 'ostree_prefix:{}'.format(ostree_prefix),
                    '-t', 'ostree_tarball:{}'.format(out_tarball + '.new'),
                    '-t', 'runtime:{}'.format(runtime),
                    '-t', 'runtime_branch:{}'.format(self.runtime_branch),
                    '-t', 'strip_source_version_suffix:{}'.format(
                        self.strip_source_version_suffix),
                ]

                if self.build_id is not None:
                    argv.append('-t')
                    argv.append('build_id:{}'.format(self.build_id))

                if sdk:
                    variant_name = self.sdk_variant_name
                    variant_id = self.sdk_variant_id

                    if variant_name is None and self.variant_name is not None:
                        variant_name = self.variant_name + ' (SDK)'
                else:
                    variant_name = self.variant_name
                    variant_id = self.variant_id

                if variant_name is None:
                    variant_name = artifact_prefix

                if variant_id is None:
                    variant_id = artifact_prefix

                argv.append('-t')
                argv.append('variant:{}'.format(variant_name))
                argv.append('-t')
                argv.append('variant_id:{}'.format(
                    self.escape_variant_id(variant_id)
                ))

                if packages:
                    logger.info('Installing packages:')
                    packages.sort()

                    for p in packages:
                        logger.info('- %s', p)

                    argv.append('-t')
                    argv.append('packages:{}'.format(
                        self.yaml_dump_one_line(packages)))

                    dest = os.path.join(scratch, 'runtimes', runtime)
                    os.makedirs(dest, 0o755, exist_ok=True)
                    dest = os.path.join(dest, 'packages.yaml')

                    with open(dest, 'w', encoding='utf-8') as writer:
                        yaml.safe_dump(packages, stream=writer)

                script = self.runtime_details.get('post_script', '')

                if script:
                    dest = os.path.join(scratch, 'post_script')

                    with open(dest, 'w', encoding='utf-8') as writer:
                        writer.write('#!/bin/sh\n')
                        writer.write(script)
                        writer.write('\n')

                    os.chmod(dest, 0o755)
                    argv.append('-t')
                    argv.append('post_script:post_script')

                if sdk:
                    sources_prefix = artifact_prefix + '-sources'
                    sources_tarball = sources_prefix + '.tar.gz'

                    debug_prefix = artifact_prefix + '-debug'
                    debug_tarball = debug_prefix + '.tar.gz'

                    sysroot_prefix = None       # type: typing.Optional[str]
                    sysroot_tarball = None      # type: typing.Optional[str]

                    if generate_sysroot_tarball:
                        sysroot_prefix = artifact_prefix + '-sysroot'
                        sysroot_tarball = sysroot_prefix + '.tar.gz'
                        argv.append('-t')
                        argv.append('sysroot_prefix:{}'.format(sysroot_prefix))
                        argv.append('-t')
                        argv.append(
                            'sysroot_tarball:{}'.format(
                                sysroot_tarball + '.new'))

                    sdk_details = self.runtime_details.get('sdk', {})
                    sdk_packages = list(sdk_details.get('add_packages', []))
                    argv.append('-t')
                    argv.append('sdk:yes')
                    argv.append('-t')
                    argv.append('debug_tarball:' + debug_tarball + '.new')
                    argv.append('-t')
                    argv.append('debug_prefix:' + debug_prefix)
                    argv.append('-t')
                    argv.append('sources_tarball:' + sources_tarball + '.new')
                    argv.append('-t')
                    argv.append('sources_prefix:' + sources_prefix)

                    for p in sdk_details.get('add_packages_multiarch', []):
                        for a in self.dpkg_archs:
                            sdk_packages.append(p + ':' + a)

                    if sdk_packages:
                        logger.info('Installing extra packages for SDK:')
                        sdk_packages.sort()

                        for p in sdk_packages:
                            logger.info('- %s', p)

                        argv.append('-t')
                        argv.append(
                            'sdk_packages:{}'.format(
                                self.yaml_dump_one_line(sdk_packages)))

                        dest = os.path.join(scratch, 'runtimes', runtime)
                        os.makedirs(dest, 0o755, exist_ok=True)
                        dest = os.path.join(dest, 'sdk_packages.yaml')

                        with open(dest, 'w', encoding='utf-8') as writer:
                            yaml.safe_dump(sdk_packages, stream=writer)

                    script = sdk_details.get('post_script', '')

                    if script:
                        dest = os.path.join(scratch, 'sdk_post_script')

                        with open(dest, 'w', encoding='utf-8') as writer:
                            writer.write('#!/bin/sh\n')
                            writer.write(script)
                            writer.write('\n')

                        os.chmod(dest, 0o755)
                        argv.append('-t')
                        argv.append('sdk_post_script:sdk_post_script')
                else:   # not sdk
                    platform_details = self.runtime_details.get('platform', {})
                    script = platform_details.get('post_script', '')

                    if script:
                        dest = os.path.join(scratch, 'platform_post_script')

                        with open(dest, 'w', encoding='utf-8') as writer:
                            writer.write('#!/bin/sh\n')
                            writer.write(script)
                            writer.write('\n')

                        os.chmod(dest, 0o755)
                        argv.append('-t')
                        argv.append(
                            'platform_post_script:platform_post_script')

                overlay = os.path.join(scratch, 'runtimes', runtime, 'overlay')
                self.create_flatpak_manifest_overlay(
                    overlay, prefix, runtime, sdk=sdk)
                self.configure_apt(
                    os.path.join(scratch, 'runtimes', runtime, 'overlay'),
                    self.final_apt_sources,
                )

                argv.append(dest_recipe)
                subprocess.check_call(argv)

                if sdk:
                    if sysroot_prefix is not None:
                        assert sysroot_tarball is not None
                        output = os.path.join(self.build_area, sysroot_tarball)
                        os.rename(output + '.new', output)

                        output = os.path.join(
                            self.build_area, sysroot_prefix + '.Dockerfile')

                        with open(
                            os.path.join(
                                os.path.dirname(__file__), 'flatdeb',
                                'Dockerfile.in'),
                            'r',
                            encoding='utf-8',
                        ) as reader:
                            content = reader.read()

                        content = content.replace(
                            '@sysroot_tarball@', sysroot_tarball)

                        with open(
                            output + '.new', 'w', encoding='utf-8'
                        ) as writer:
                            writer.write(content)

                        os.rename(output + '.new', output)

                    output = os.path.join(self.build_area, debug_tarball)
                    os.rename(output + '.new', output)

                    if self.ostree_commit:
                        logger.info('Committing %s to OSTree', debug_tarball)
                        subprocess.check_call([
                            'time',
                            'ostree',
                            '--repo=' + self.ostree_repo,
                            'commit',
                            '--branch=runtime/{}.Debug/{}/{}'.format(
                                runtime,
                                self.flatpak_arch,
                                self.runtime_branch,
                            ),
                            '--subject=Update',
                            '--tree=tar={}'.format(output),
                            '--fsync=false',
                            '--tar-autocreate-parents',
                        ])

                    output = os.path.join(self.build_area, sources_tarball)
                    os.rename(output + '.new', output)

                    if self.ostree_commit:
                        logger.info('Committing %s to OSTree', sources_tarball)
                        subprocess.check_call([
                            'time',
                            'ostree',
                            '--repo=' + self.ostree_repo,
                            'commit',
                            '--branch=runtime/{}.Sources/{}/{}'.format(
                                runtime,
                                self.flatpak_arch,
                                self.runtime_branch,
                            ),
                            '--subject=Update',
                            '--tree=tar={}'.format(output),
                            '--fsync=false',
                            '--tar-autocreate-parents',
                        ])

                output = os.path.join(self.build_area, out_tarball)
                os.rename(output + '.new', output)

                if self.ostree_commit:
                    logger.info('Committing %s to OSTree', out_tarball)
                    subprocess.check_call([
                        'time',
                        'ostree',
                        '--repo=' + self.ostree_repo,
                        'commit',
                        '--branch=runtime/{}/{}/{}'.format(
                            runtime,
                            self.flatpak_arch,
                            self.runtime_branch,
                        ),
                        '--subject=Update',
                        '--tree=tar={}'.format(output),
                        '--fsync=false',
                        '--tar-autocreate-parents',
                    ])

            if self.ostree_commit:
                # Don't keep the history in this working repository:
                # if history is desired, mirror the commits into a public
                # repository and maintain history there.
                subprocess.check_call([
                    'time',
                    'ostree',
                    '--repo=' + self.ostree_repo,
                    'prune',
                    '--refs-only',
                    '--depth=1',
                ])

                subprocess.check_call([
                    'time',
                    'flatpak',
                    'build-update-repo',
                    self.ostree_repo,
                ])

                if self.export_bundles:
                    for suffix in ('.Platform', '.Sdk'):
                        bundle = '{}-{}-{}.bundle'.format(
                            prefix + suffix,
                            ','.join(self.dpkg_archs),
                            self.runtime_branch,
                        )
                        output = os.path.join(self.build_area, bundle)

                        subprocess.check_call([
                            'time',
                            'flatpak',
                            'build-bundle',
                            '--runtime',
                            self.ostree_repo,
                            output + '.new',
                            prefix + suffix,
                            self.runtime_branch,
                        ])

                        os.rename(output + '.new', output)

    def configure_apt(self, overlay, apt_sources):
        # type: (str, typing.Iterable[AptSource]) -> None
        """
        Configure apt. We only do this once, so that all chroots
        created from the same base have their version numbers
        aligned.
        """
        os.makedirs(
            os.path.join(overlay, 'etc', 'apt', 'trusted.gpg.d'),
            0o755,
            exist_ok=True,
        )

        with open(
            os.path.join(overlay, 'etc', 'apt', 'sources.list'),
            'w',
            encoding='utf-8'
        ) as writer:
            for source in apt_sources:
                writer.write('{}\n'.format(source))

            for keyring in self.apt_keyrings:
                if os.path.exists(os.path.join('suites', keyring)):
                    keyring = os.path.join('suites', keyring)
                elif os.path.exists(keyring):
                    pass
                else:
                    raise RuntimeError('Cannot open {}'.format(keyring))

                shutil.copyfile(
                    os.path.abspath(keyring),
                    os.path.join(
                        overlay,
                        'etc', 'apt', 'trusted.gpg.d',
                        os.path.basename(keyring),
                    ),
                )

    def create_flatpak_manifest_overlay(
        self,
        overlay,        # type: str
        prefix,         # type: str
        runtime,        # type: str
        sdk=False,
    ):
        # type: (...) -> None
        metadata = os.path.join(overlay, 'metadata')
        os.makedirs(os.path.dirname(metadata), 0o755, exist_ok=True)

        keyfile = GLib.KeyFile()
        keyfile.set_string('Runtime', 'name', runtime)
        keyfile.set_string(
            'Runtime', 'runtime',
            '{}.Platform/{}/{}'.format(
                prefix,
                self.flatpak_arch,
                self.runtime_branch,
            )
        )
        keyfile.set_string(
            'Runtime', 'sdk',
            '{}.Sdk/{}/{}'.format(
                prefix,
                self.flatpak_arch,
                self.runtime_branch,
            )
        )

        keyfile.set_string(
            'Runtime', 'x-flatdeb-sources',
            '{}.Sdk.Sources/{}/{}'.format(
                prefix,
                self.flatpak_arch,
                self.runtime_branch,
            ),
        )

        keyfile.set_string(
            'Environment', 'XDG_DATA_DIRS',
            ':'.join([
                '/app/share', '/usr/share', '/usr/share/runtime/share',
            ]),
        )

        if sdk:
            keyfile.set_string(
                'Extension {}.Sdk.Debug'.format(prefix),
                'directory', 'lib/debug',
            )
            keyfile.set_boolean(
                'Extension {}.Sdk.Debug'.format(prefix),
                'autodelete', True,
            )
            keyfile.set_boolean(
                'Extension {}.Sdk.Debug'.format(prefix),
                'no-autodownload', True,
            )

            keyfile.set_string(
                'Extension {}.Sdk.Sources'.format(prefix),
                'directory', 'runtime/src',
            )
            keyfile.set_boolean(
                'Extension {}.Sdk.Sources'.format(prefix),
                'autodelete', True,
            )
            keyfile.set_boolean(
                'Extension {}.Sdk.Sources'.format(prefix),
                'no-autodownload', True,
            )

        search_path = []

        for arch in self.dpkg_archs:
            search_path.append('/app/lib/{}'.format(
                self.multiarch_tuple(arch)))

        search_path.append('/app/lib')

        keyfile.set_string(
            'Environment', 'LD_LIBRARY_PATH', ':'.join(search_path),
        )

        if True:    # TODO: 'libgstreamer1.0-0' in installed:
            search_path = []

            for arch in self.dpkg_archs:
                search_path.append(
                    '/app/lib/{}/gstreamer-1.0'.format(
                        self.multiarch_tuple(arch)))

            search_path.append('/app/lib/gstreamer-1.0')

            for arch in self.dpkg_archs:
                search_path.append(
                    '/usr/lib/extensions/{}/gstreamer-1.0'.format(
                        self.multiarch_tuple(arch)))

            search_path.append('/usr/lib/extensions/gstreamer-1.0')

            for arch in self.dpkg_archs:
                search_path.append(
                    '/usr/lib/{}/gstreamer-1.0'.format(
                        self.multiarch_tuple(arch)))

            search_path.append('/usr/lib/gstreamer-1.0')

            keyfile.set_string(
                'Environment', 'GST_PLUGIN_SYSTEM_PATH',
                ':'.join(search_path),
            )

        if True:    # TODO: 'libgirepository-1.0-1' in installed:
            search_path = []

            for arch in self.dpkg_archs:
                search_path.append(
                    '/app/lib/{}/girepository-1.0'.format(
                        self.multiarch_tuple(arch)))

            search_path.append('/app/lib/girepository-1.0')

            keyfile.set_string(
                'Environment', 'GI_TYPELIB_PATH',
                ':'.join(search_path),
            )

        keyfile.set_string(
            'Runtime', 'x-flatdeb-version', VERSION,
        )

        if self.build_id is not None:
            keyfile.set_string(
                'Runtime', 'x-flatdeb-build-id', self.build_id,
            )

        for ext, detail in self.runtime_details.get(
                'add-extensions', {}
                ).items():
            group = 'Extension {}'.format(ext)

            os.makedirs(
                os.path.join(
                    overlay, 'usr',
                    detail['directory'],
                ),
                0o755,
                exist_ok=True,
            )

            for k, v in detail.items():
                if isinstance(v, str):
                    keyfile.set_string(group, k, v)
                elif isinstance(v, bool):
                    keyfile.set_boolean(group, k, v)
                else:
                    raise RuntimeError(
                        'Unknown type {} in {}'.format(v, ext))

        keyfile.save_to_file(metadata)

        if sdk:
            metadata = os.path.join(overlay, 'debug', 'metadata')
            os.makedirs(os.path.dirname(metadata), 0o755, exist_ok=True)

            keyfile = GLib.KeyFile()
            keyfile.set_string('Runtime', 'name', runtime + '.Debug')
            keyfile.set_string(
                'Runtime', 'runtime',
                '{}.Platform/{}/{}'.format(
                    prefix,
                    self.flatpak_arch,
                    self.runtime_branch,
                )
            )
            keyfile.set_string(
                'Runtime', 'sdk',
                '{}.Sdk/{}/{}'.format(
                    prefix,
                    self.flatpak_arch,
                    self.runtime_branch,
                )
            )

            keyfile.set_string(
                'Runtime', 'x-flatdeb-version', VERSION,
            )

            if self.build_id is not None:
                keyfile.set_string(
                    'Runtime', 'x-flatdeb-build-id', self.build_id,
                )

            keyfile.save_to_file(metadata)

            metadata = os.path.join(overlay, 'src', 'metadata')
            os.makedirs(os.path.dirname(metadata), 0o755, exist_ok=True)

            keyfile = GLib.KeyFile()
            keyfile.set_string('Runtime', 'name', runtime + '.Sources')
            keyfile.set_string(
                'Runtime', 'runtime',
                '{}.Platform/{}/{}'.format(
                    prefix,
                    self.flatpak_arch,
                    self.runtime_branch,
                )
            )
            keyfile.set_string(
                'Runtime', 'sdk',
                '{}.Sdk/{}/{}'.format(
                    prefix,
                    self.flatpak_arch,
                    self.runtime_branch,
                )
            )

            keyfile.set_string(
                'Runtime', 'x-flatdeb-version', VERSION,
            )

            if self.build_id is not None:
                keyfile.set_string(
                    'Runtime', 'x-flatdeb-build-id', self.build_id,
                )

            keyfile.save_to_file(metadata)

    def command_app(
        self,
        *,
        app_branch,         # type: str
        yaml_manifest,      # type: str
        **kwargs
    ):
        # type: (...) -> None

        if not self.ostree_commit:
            logger.error(
                'flatdeb app --no-ostree-commit cannot work')
            raise SystemExit(1)

        self.ensure_local_repo()

        with open(yaml_manifest, encoding='utf-8') as reader:
            manifest = yaml.safe_load(reader)

        if self.runtime_branch is None:
            self.runtime_branch = manifest.get('runtime-version')

        if self.runtime_branch is None:
            self.runtime_branch = self.apt_suite

        self.app_branch = app_branch

        if self.app_branch is None:
            self.app_branch = manifest.get('branch')

        if self.app_branch is None:
            self.app_branch = 'master'

        manifest['branch'] = self.app_branch
        manifest['runtime-version'] = self.runtime_branch

        with ExitStack() as stack:
            # We assume the build area has xattr support
            self.ensure_build_area()
            self.ensure_local_repo()
            scratch = stack.enter_context(
                TemporaryDirectory(
                    prefix='flatdeb.',
                    dir=os.path.join(self.build_area, 'tmp'),
                )
            )

            os.makedirs(os.path.join(scratch, 'home'), 0o755, exist_ok=True)
            subprocess.check_call([
                'env',
                'XDG_DATA_HOME={}/home'.format(scratch),
                'flatpak', '--user',
                'remote-add', '--if-not-exists', '--no-gpg-verify',
                'flatdeb',
                'file://{}'.format(urllib.parse.quote(self.ostree_repo)),
            ])
            subprocess.check_call([
                'env',
                'XDG_DATA_HOME={}/home'.format(scratch),
                'flatpak', '--user',
                'remote-modify', '--no-gpg-verify',
                '--url=file://{}'.format(urllib.parse.quote(self.ostree_repo)),
                'flatdeb',
            ])

            for runtime in (manifest['sdk'], manifest['runtime']):
                # This may fail: we might already have it.
                subprocess.call([
                    'env',
                    'XDG_DATA_HOME={}/home'.format(scratch),
                    'flatpak', '--user',
                    'install', '-y', 'flatdeb',
                    '{}/{}/{}'.format(
                        runtime,
                        self.flatpak_arch,
                        self.runtime_branch,
                    ),
                ])
                subprocess.check_call([
                    'env',
                    'XDG_DATA_HOME={}/home'.format(scratch),
                    'flatpak', '--user',
                    'update',
                    '{}/{}/{}'.format(
                        runtime,
                        self.flatpak_arch,
                        self.runtime_branch,
                    ),
                ])

            for module in manifest.get('modules', []):
                if isinstance(module, dict):
                    sources = module.setdefault('sources', [])

                    for source in sources:
                        if 'path' in source:
                            if source.get('type') == 'git':
                                clone = stack.enter_context(
                                    TemporaryDirectory(
                                        prefix='flatdeb-git.',
                                        dir=scratch,
                                    ),
                                )
                                uploader = subprocess.Popen([
                                    'tar',
                                    '-cf-',
                                    '-C', source['path'],
                                    '.',
                                ], stdout=subprocess.PIPE)
                                subprocess.check_call([
                                    'tar',
                                    '-xf-',
                                    '-C', clone,
                                ], stdin=uploader.stdout)
                                uploader.wait()
                                source['path'] = clone
                            else:
                                d = stack.enter_context(
                                    TemporaryDirectory(
                                        prefix='flatdeb-path.',
                                        dir=scratch,
                                    ),
                                )
                                clone = os.path.join(
                                    d, os.path.basename(source['path']),
                                )
                                shutil.copyfile(
                                    source['path'],
                                    clone,
                                )

                                if GLib.file_test(
                                        source['path'],
                                        GLib.FileTest.IS_EXECUTABLE,
                                ):
                                    os.chmod(clone, 0o755)
                                else:
                                    os.chmod(clone, 0o644)

                                source['path'] = clone

                    if 'x-flatdeb-apt-packages' in module:
                        packages = stack.enter_context(
                            TemporaryDirectory(
                                prefix='flatdeb-debs.',
                                dir=scratch,
                            ),
                        )
                        subprocess.check_call([
                            'env',
                            'XDG_DATA_HOME={}/home'.format(scratch),
                            'flatpak', 'run',
                            '--filesystem={}'.format(packages),
                            '--share=network',
                            '--command=/usr/bin/env',
                            '{}/{}/{}'.format(
                                manifest['sdk'],
                                self.flatpak_arch,
                                self.runtime_branch,
                            ),
                            'DEBIAN_FRONTEND=noninteractive',
                            'export={}'.format(packages),
                            'sh',
                            '-euc',

                            'cp -PRp /usr/var /\n'
                            'install -d /var/cache/apt/archives/partial\n'
                            'fakeroot apt-get update\n'
                            'fakeroot apt-get -y --download-only \\\n'
                            '    --no-install-recommends install "$@"\n'
                            'for x in /var/cache/apt/archives/*.deb; do\n'
                            '    package="$(dpkg-deb -f "$x" Package)"\n'
                            '    source="$(dpkg-deb -f "$x" Source)"\n'
                            '    bu="$(dpkg-deb -f "$x" Built-Using)"\n'
                            '    version="$(dpkg-deb -f "$x" Version)"\n'
                            '    if [ -z "$source" ]; then\n'
                            '        source="$package"\n'
                            '    fi\n'
                            '    if [ "${source% (*}" != "$source" ]; then\n'
                            '        version="${source#* (}"\n'
                            '        version="${version%)}"\n'
                            '        source="${source% (*}"\n'
                            '    fi\n'
                            '    ( cd "$export" && \\\n'
                            '         apt-get -y --download-only \\\n'
                            '         -oAPT::Get::Only-Source=true source \\\n'
                            '         "$source=$version"\n'
                            '    )\n'
                            '    if [ -n "$bu" ]; then\n'
                            '        oldIFS="$IFS"\n'
                            '        IFS=","\n'
                            '        for dep in $bu; do\n'
                            '            bu="$(echo "$bu" | tr -d " ")"\n'
                            '            version="${bu#*(=}"\n'
                            '            version="${version%)}"\n'
                            '            source="${bu%(*}"\n'
                            '            ( cd "$export" && \\\n'
                            '               apt-get -y --download-only \\\n'
                            '               -oAPT::Get::Only-Source=true \\\n'
                            '               source "$source=$version"\n'
                            '            )\n'
                            '        done\n'
                            '        IFS="$oldIFS"\n'
                            '    fi\n'
                            'done\n'
                            'mv /var/cache/apt/archives/*.deb "$export"\n'
                            'mv /var/lib/apt/lists "$export"\n'
                            '',

                            'sh',   # argv[0]
                        ] + module['x-flatdeb-apt-packages'])

                        obtained = subprocess.check_output([
                            'sh', '-euc',
                            'cd "$1"\n'
                            'find * -type f -print0 | xargs -0 sha256sum -b\n'
                            '',
                            'sh',   # argv[0]
                            packages,
                        ]).decode('utf-8').splitlines()

                        for line in obtained:
                            sha256, f = line.split(' *', 1)
                            path = '{}/{}'.format(packages, f)

                            sources.append({
                                'dest': (os.path.dirname(f) or '.'),
                                'type': 'file',
                                'sha256': sha256,
                                'url': urllib.parse.urlunsplit((
                                    'file',
                                    '',
                                    urllib.parse.quote(path),
                                    '',
                                    '',
                                ))
                            })

            json_manifest = os.path.join(scratch, manifest['id'] + '.json')
            os.makedirs(
                os.path.join(self.build_area, '.flatpak-builder'),
                exist_ok=True,
            )

            if self.build_area != scratch:
                subprocess.check_call([
                    'ln', '-nsf',
                    os.path.join(self.build_area, '.flatpak-builder'),
                    '{}/'.format(scratch),
                ])

            with open(json_manifest, 'w', encoding='utf-8') as writer:
                json.dump(manifest, writer, indent=2, sort_keys=True)

            subprocess.check_call([
                'env',
                'DEBIAN_FRONTEND=noninteractive',
                'XDG_DATA_HOME={}/home'.format(scratch),
                'sh', '-euc',
                'cd "$1"; shift; exec "$@"',
                'sh',                   # argv[0]
                scratch,                # directory to cd into
                'flatpak-builder',
                '--arch={}'.format(self.flatpak_arch),
                '--repo={}'.format(self.ostree_repo),
                '--bundle-sources',
                os.path.join(scratch, 'workdir'),
                json_manifest,
            ])

            if self.export_bundles:
                bundle = '{}-{}-{}.bundle'.format(
                    manifest['id'],
                    self.flatpak_arch,
                    manifest['branch'],
                )
                output = os.path.join(self.build_area, bundle)
                subprocess.check_call([
                    'time',
                    'env',
                    'XDG_DATA_HOME={}/home'.format(scratch),
                    'flatpak',
                    'build-bundle',
                    self.ostree_repo,
                    output + '.new',
                    manifest['id'],
                    manifest['branch'],
                ])
                os.rename(output + '.new', output)


if __name__ == '__main__':
    if sys.stderr.isatty():
        try:
            import colorlog
        except ImportError:
            pass
        else:
            formatter = colorlog.ColoredFormatter(
                '%(log_color)s%(levelname)s:%(name)s:%(reset)s %(message)s')
            handler = logging.StreamHandler()
            handler.setFormatter(formatter)
            logging.getLogger().addHandler(handler)
    else:
        logging.basicConfig()

    logging.getLogger().setLevel(logging.DEBUG)

    try:
        Builder().run_command_line()
    except KeyboardInterrupt:
        raise SystemExit(130)
    except subprocess.CalledProcessError as e:
        logger.error('%s', e)
        raise SystemExit(1)