borg/setup.py

# -*- encoding: utf-8 *-*
import os
import io
import re
import sys
from collections import OrderedDict
from datetime import datetime
from glob import glob

from distutils.command.build import build
from distutils.core import Command

import textwrap

import setup_lz4
import setup_zstd

# True: use the shared liblz4 (>= TBD) from the system, False: use the bundled lz4 code
prefer_system_liblz4 = True

# True: use the shared libzstd (>= 1.3.0) from the system, False: use the bundled zstd code
prefer_system_libzstd = True

min_python = (3, 5)
my_python = sys.version_info

if my_python < min_python:
    print("Borg requires Python %d.%d or later" % min_python)
    sys.exit(1)

# Are we building on ReadTheDocs?
on_rtd = os.environ.get('READTHEDOCS')

install_requires = [
    # msgpack pure python data corruption was fixed in 0.4.6.
    # Also, we might use some rather recent API features.
    'msgpack-python>=0.4.6',
    'pyzmq',
]

# note for package maintainers: if you package borgbackup for distribution,
# please add llfuse as a *requirement* on all platforms that have a working
# llfuse package. "borg mount" needs llfuse to work.
# if you do not have llfuse, do not require it, most of borgbackup will work.
extras_require = {
    # llfuse 0.40 (tested, proven, ok), needs FUSE version >= 2.8.0
    # llfuse 0.41 (tested shortly, looks ok), needs FUSE version >= 2.8.0
    # llfuse 0.41.1 (tested shortly, looks ok), needs FUSE version >= 2.8.0
    # llfuse 0.42 (tested shortly, looks ok), needs FUSE version >= 2.8.0
    # llfuse 1.0 (tested shortly, looks ok), needs FUSE version >= 2.8.0
    # llfuse 1.1.1 (tested shortly, looks ok), needs FUSE version >= 2.8.0
    # llfuse 1.2 (tested shortly, looks ok), needs FUSE version >= 2.8.0
    # llfuse 1.3 (tested shortly, looks ok), needs FUSE version >= 2.8.0
    # llfuse 2.0 will break API
    'fuse': ['llfuse<2.0', ],
}

if sys.platform.startswith('freebsd'):
    # llfuse was frequently broken / did not build on freebsd
    # llfuse 0.41.1, 1.1 are ok
    extras_require['fuse'] = ['llfuse <2.0, !=0.42.*, !=0.43, !=1.0', ]

from setuptools import setup, find_packages, Extension
from setuptools.command.sdist import sdist
from distutils.command.clean import clean

compress_source = 'src/borg/compress.pyx'
crypto_ll_source = 'src/borg/crypto/low_level.pyx'
crypto_helpers = 'src/borg/crypto/_crypto_helpers.c'
chunker_source = 'src/borg/chunker.pyx'
hashindex_source = 'src/borg/hashindex.pyx'
item_source = 'src/borg/item.pyx'
checksums_source = 'src/borg/algorithms/checksums.pyx'
platform_posix_source = 'src/borg/platform/posix.pyx'
platform_linux_source = 'src/borg/platform/linux.pyx'
platform_darwin_source = 'src/borg/platform/darwin.pyx'
platform_freebsd_source = 'src/borg/platform/freebsd.pyx'

cython_sources = [
    compress_source,
    crypto_ll_source,
    chunker_source,
    hashindex_source,
    item_source,
    checksums_source,

    platform_posix_source,
    platform_linux_source,
    platform_freebsd_source,
    platform_darwin_source,
]

try:
    from Cython.Distutils import build_ext
    import Cython.Compiler.Main as cython_compiler

    class Sdist(sdist):
        def __init__(self, *args, **kwargs):
            for src in cython_sources:
                cython_compiler.compile(src, cython_compiler.default_options)
            super().__init__(*args, **kwargs)

        def make_distribution(self):
            self.filelist.extend([
                'src/borg/compress.c',
                'src/borg/crypto/low_level.c',
                'src/borg/chunker.c', 'src/borg/_chunker.c',
                'src/borg/hashindex.c', 'src/borg/_hashindex.c',
                'src/borg/cache_sync/cache_sync.c', 'src/borg/cache_sync/sysdep.h', 'src/borg/cache_sync/unpack.h',
                'src/borg/cache_sync/unpack_define.h', 'src/borg/cache_sync/unpack_template.h',
                'src/borg/item.c',
                'src/borg/algorithms/checksums.c',
                'src/borg/algorithms/crc32_dispatch.c', 'src/borg/algorithms/crc32_clmul.c', 'src/borg/algorithms/crc32_slice_by_8.c',
                'src/borg/algorithms/xxh64/xxhash.h', 'src/borg/algorithms/xxh64/xxhash.c',
                'src/borg/platform/posix.c',
                'src/borg/platform/linux.c',
                'src/borg/platform/freebsd.c',
                'src/borg/platform/darwin.c',
            ])
            super().make_distribution()

except ImportError:
    class Sdist(sdist):
        def __init__(self, *args, **kwargs):
            raise Exception('Cython is required to run sdist')

    compress_source = compress_source.replace('.pyx', '.c')
    crypto_ll_source = crypto_ll_source.replace('.pyx', '.c')
    chunker_source = chunker_source.replace('.pyx', '.c')
    hashindex_source = hashindex_source.replace('.pyx', '.c')
    item_source = item_source.replace('.pyx', '.c')
    checksums_source = checksums_source.replace('.pyx', '.c')
    platform_posix_source = platform_posix_source.replace('.pyx', '.c')
    platform_linux_source = platform_linux_source.replace('.pyx', '.c')
    platform_freebsd_source = platform_freebsd_source.replace('.pyx', '.c')
    platform_darwin_source = platform_darwin_source.replace('.pyx', '.c')
    from distutils.command.build_ext import build_ext
    if not on_rtd and not all(os.path.exists(path) for path in [
        compress_source, crypto_ll_source, chunker_source, hashindex_source, item_source, checksums_source,
        platform_posix_source, platform_linux_source, platform_freebsd_source, platform_darwin_source]):
        raise ImportError('The GIT version of Borg needs Cython. Install Cython or use a released version.')


def detect_openssl(prefixes):
    for prefix in prefixes:
        filename = os.path.join(prefix, 'include', 'openssl', 'evp.h')
        if os.path.exists(filename):
            with open(filename, 'r') as fd:
                if 'PKCS5_PBKDF2_HMAC(' in fd.read():
                    return prefix


def detect_libb2(prefixes):
    for prefix in prefixes:
        filename = os.path.join(prefix, 'include', 'blake2.h')
        if os.path.exists(filename):
            with open(filename, 'r') as fd:
                if 'blake2b_init' in fd.read():
                    return prefix


include_dirs = []
library_dirs = []
define_macros = []
crypto_libraries = ['crypto']

possible_openssl_prefixes = ['/usr', '/usr/local', '/usr/local/opt/openssl', '/usr/local/ssl', '/usr/local/openssl',
                             '/usr/local/borg', '/opt/local', '/opt/pkg', ]
if os.environ.get('BORG_OPENSSL_PREFIX'):
    possible_openssl_prefixes.insert(0, os.environ.get('BORG_OPENSSL_PREFIX'))
ssl_prefix = detect_openssl(possible_openssl_prefixes)
if not ssl_prefix:
    raise Exception('Unable to find OpenSSL >= 1.0 headers. (Looked here: {})'.format(', '.join(possible_openssl_prefixes)))
include_dirs.append(os.path.join(ssl_prefix, 'include'))
library_dirs.append(os.path.join(ssl_prefix, 'lib'))


possible_liblz4_prefixes = ['/usr', '/usr/local', '/usr/local/opt/lz4', '/usr/local/lz4',
                         '/usr/local/borg', '/opt/local', '/opt/pkg', ]
if os.environ.get('BORG_LIBLZ4_PREFIX'):
    possible_liblz4_prefixes.insert(0, os.environ.get('BORG_LIBLZ4_PREFIX'))
liblz4_prefix = setup_lz4.lz4_system_prefix(possible_liblz4_prefixes)
if prefer_system_liblz4 and liblz4_prefix:
    print('Detected and preferring liblz4 over bundled LZ4')
    define_macros.append(('BORG_USE_LIBLZ4', 'YES'))
    liblz4_system = True
else:
    liblz4_system = False

possible_libb2_prefixes = ['/usr', '/usr/local', '/usr/local/opt/libb2', '/usr/local/libb2',
                           '/usr/local/borg', '/opt/local', '/opt/pkg', ]
if os.environ.get('BORG_LIBB2_PREFIX'):
    possible_libb2_prefixes.insert(0, os.environ.get('BORG_LIBB2_PREFIX'))
libb2_prefix = detect_libb2(possible_libb2_prefixes)
if libb2_prefix:
    print('Detected and preferring libb2 over bundled BLAKE2')
    include_dirs.append(os.path.join(libb2_prefix, 'include'))
    library_dirs.append(os.path.join(libb2_prefix, 'lib'))
    crypto_libraries.append('b2')
    define_macros.append(('BORG_USE_LIBB2', 'YES'))

possible_libzstd_prefixes = ['/usr', '/usr/local', '/usr/local/opt/libzstd', '/usr/local/libzstd',
                             '/usr/local/borg', '/opt/local', '/opt/pkg', ]
if os.environ.get('BORG_LIBZSTD_PREFIX'):
    possible_libzstd_prefixes.insert(0, os.environ.get('BORG_LIBZSTD_PREFIX'))
libzstd_prefix = setup_zstd.zstd_system_prefix(possible_libzstd_prefixes)
if prefer_system_libzstd and libzstd_prefix:
    print('Detected and preferring libzstd over bundled ZSTD')
    define_macros.append(('BORG_USE_LIBZSTD', 'YES'))
    libzstd_system = True
else:
    libzstd_system = False


with open('README.rst', 'r') as fd:
    long_description = fd.read()
    # remove badges
    long_description = re.compile(r'^\.\. start-badges.*^\.\. end-badges', re.M | re.S).sub('', long_description)
    # remove |substitutions|
    long_description = re.compile(r'\|screencast\|').sub('', long_description)
    # remove unknown directives
    long_description = re.compile(r'^\.\. highlight:: \w+$', re.M).sub('', long_description)


def format_metavar(option):
    if option.nargs in ('*', '...'):
        return '[%s...]' % option.metavar
    elif option.nargs == '?':
        return '[%s]' % option.metavar
    elif option.nargs is None:
        return option.metavar
    else:
        raise ValueError('Can\'t format metavar %s, unknown nargs %s!' % (option.metavar, option.nargs))


class build_usage(Command):
    description = "generate usage for each command"

    user_options = [
        ('output=', 'O', 'output directory'),
    ]

    def initialize_options(self):
        pass

    def finalize_options(self):
        pass

    def run(self):
        print('generating usage docs')
        import borg
        borg.doc_mode = 'build_man'
        if not os.path.exists('docs/usage'):
            os.mkdir('docs/usage')
        # allows us to build docs without the C modules fully loaded during help generation
        from borg.archiver import Archiver
        parser = Archiver(prog='borg').build_parser()
        # borgfs has a separate man page to satisfy debian's "every program from a package
        # must have a man page" requirement, but it doesn't need a separate HTML docs page
        #borgfs_parser = Archiver(prog='borgfs').build_parser()

        self.generate_level("", parser, Archiver)

    def generate_level(self, prefix, parser, Archiver, extra_choices=None):
        is_subcommand = False
        choices = {}
        for action in parser._actions:
            if action.choices is not None and 'SubParsersAction' in str(action.__class__):
                is_subcommand = True
                for cmd, parser in action.choices.items():
                    choices[prefix + cmd] = parser
        if extra_choices is not None:
            choices.update(extra_choices)
        if prefix and not choices:
            return
        print('found commands: %s' % list(choices.keys()))

        for command, parser in sorted(choices.items()):
            if command.startswith('debug'):
                print('skipping', command)
                continue
            print('generating help for %s' % command)

            if self.generate_level(command + " ", parser, Archiver):
                continue

            with open('docs/usage/%s.rst.inc' % command.replace(" ", "_"), 'w') as doc:
                doc.write(".. IMPORTANT: this file is auto-generated from borg's built-in help, do not edit!\n\n")
                if command == 'help':
                    for topic in Archiver.helptext:
                        params = {"topic": topic,
                                  "underline": '~' * len('borg help ' + topic)}
                        doc.write(".. _borg_{topic}:\n\n".format(**params))
                        doc.write("borg help {topic}\n{underline}\n\n".format(**params))
                        doc.write(Archiver.helptext[topic])
                else:
                    params = {"command": command,
                              "command_": command.replace(' ', '_'),
                              "underline": '-' * len('borg ' + command)}
                    doc.write(".. _borg_{command_}:\n\n".format(**params))
                    doc.write("borg {command}\n{underline}\n.. code-block:: none\n\n    borg [common options] {command}".format(**params))
                    self.write_usage(parser, doc)
                    epilog = parser.epilog
                    parser.epilog = None
                    self.write_options(parser, doc)
                    doc.write("\n\nDescription\n~~~~~~~~~~~\n")
                    doc.write(epilog)

        if 'create' in choices:
            common_options = [group for group in choices['create']._action_groups if group.title == 'Common options'][0]
            with open('docs/usage/common-options.rst.inc', 'w') as doc:
                self.write_options_group(common_options, doc, False, base_indent=0)

        return is_subcommand

    def write_usage(self, parser, fp):
        if any(len(o.option_strings) for o in parser._actions):
            fp.write(' [options]')
        for option in parser._actions:
            if option.option_strings:
                continue
            fp.write(' ' + format_metavar(option))
        fp.write('\n\n')

    def write_options(self, parser, fp):
        def is_positional_group(group):
            return any(not o.option_strings for o in group._group_actions)

        # HTML output:
        # A table using some column-spans

        def html_write(s):
            for line in s.splitlines():
                fp.write('    ' + line + '\n')

        rows = []
        for group in parser._action_groups:
            if group.title == 'Common options':
                # (no of columns used, columns, ...)
                rows.append((1, '.. class:: borg-common-opt-ref\n\n:ref:`common_options`'))
            else:
                if not group._group_actions:
                    continue
                group_header = '**%s**' % group.title
                if group.description:
                    group_header += ' — ' + group.description
                rows.append((1, group_header))
                if is_positional_group(group):
                    for option in group._group_actions:
                        rows.append((3, '', '``%s``' % option.metavar, option.help or ''))
                else:
                    for option in group._group_actions:
                        if option.metavar:
                            option_fmt = '``%s ' + option.metavar + '``'
                        else:
                            option_fmt = '``%s``'
                        option_str = ', '.join(option_fmt % s for s in option.option_strings)
                        option_desc = textwrap.dedent((option.help or '') % option.__dict__)
                        rows.append((3, '', option_str, option_desc))

        fp.write('.. only:: html\n\n')
        table = io.StringIO()
        table.write('.. class:: borg-options-table\n\n')
        self.rows_to_table(rows, table.write)
        fp.write(textwrap.indent(table.getvalue(), ' ' * 4))

        # LaTeX output:
        # Regular rST option lists (irregular column widths)
        latex_options = io.StringIO()
        for group in parser._action_groups:
            if group.title == 'Common options':
                latex_options.write('\n\n:ref:`common_options`\n')
                latex_options.write('    |')
            else:
                self.write_options_group(group, latex_options)
        fp.write('\n.. only:: latex\n\n')
        fp.write(textwrap.indent(latex_options.getvalue(), ' ' * 4))

    def rows_to_table(self, rows, write):
        def write_row_separator():
            write('+')
            for column_width in column_widths:
                write('-' * (column_width + 1))
                write('+')
            write('\n')

        # Find column count and width
        column_count = max(columns for columns, *_ in rows)
        column_widths = [0] * column_count
        for columns, *cells in rows:
            for i in range(columns):
                # "+ 1" because we want a space between the cell contents and the delimiting "|" in the output
                column_widths[i] = max(column_widths[i], len(cells[i]) + 1)

        for columns, *original_cells in rows:
            write_row_separator()
            # If a cell contains newlines, then the row must be split up in individual rows
            # where each cell contains no newline.
            rowspanning_cells = []
            original_cells = list(original_cells)
            while any('\n' in cell for cell in original_cells):
                cell_bloc = []
                for i, cell in enumerate(original_cells):
                    pre, _, original_cells[i] = cell.partition('\n')
                    cell_bloc.append(pre)
                rowspanning_cells.append(cell_bloc)
            rowspanning_cells.append(original_cells)
            for cells in rowspanning_cells:
                for i, column_width in enumerate(column_widths):
                    if i < columns:
                        write('| ')
                        write(cells[i].ljust(column_width))
                    else:
                        write('  ')
                        write(''.ljust(column_width))
                write('|\n')

        write_row_separator()
        # This bit of JavaScript kills the <colgroup> that is invariably inserted by docutils,
        # but does absolutely no good here. It sets bogus column widths which cannot be overridden
        # with CSS alone.
        # Since this is HTML-only output, it would be possible to just generate a <table> directly,
        # but then we'd lose rST formatting.
        write(textwrap.dedent("""
        .. raw:: html

            <script type='text/javascript'>
            $(document).ready(function () {
                $('.borg-options-table colgroup').remove();
            })
            </script>
        """))

    def write_options_group(self, group, fp, with_title=True, base_indent=4):
        def is_positional_group(group):
            return any(not o.option_strings for o in group._group_actions)

        indent = ' ' * base_indent

        if is_positional_group(group):
            for option in group._group_actions:
                fp.write(option.metavar + '\n')
                fp.write(textwrap.indent(option.help or '', ' ' * base_indent) + '\n')
            return

        if not group._group_actions:
            return

        if with_title:
            fp.write('\n\n')
            fp.write(group.title + '\n')

        opts = OrderedDict()

        for option in group._group_actions:
            if option.metavar:
                option_fmt = '%s ' + option.metavar
            else:
                option_fmt = '%s'
            option_str = ', '.join(option_fmt % s for s in option.option_strings)
            option_desc = textwrap.dedent((option.help or '') % option.__dict__)
            opts[option_str] = textwrap.indent(option_desc, ' ' * 4)

        padding = len(max(opts)) + 1

        for option, desc in opts.items():
            fp.write(indent + option.ljust(padding) + desc + '\n')


class build_man(Command):
    description = 'build man pages'

    user_options = []

    see_also = {
        'create': ('delete', 'prune', 'check', 'patterns', 'placeholders', 'compression'),
        'recreate': ('patterns', 'placeholders', 'compression'),
        'list': ('info', 'diff', 'prune', 'patterns'),
        'info': ('list', 'diff'),
        'init': ('create', 'delete', 'check', 'list', 'key-import', 'key-export', 'key-change-passphrase'),
        'key-import': ('key-export', ),
        'key-export': ('key-import', ),
        'mount': ('umount', 'extract'),  # Would be cooler if these two were on the same page
        'umount': ('mount', ),
        'extract': ('mount', ),
    }

    rst_prelude = textwrap.dedent("""
    .. role:: ref(title)

    .. |project_name| replace:: Borg

    """)

    usage_group = {
        'break-lock': 'lock',
        'with-lock': 'lock',

        'change-passphrase': 'key',
        'key_change-passphrase': 'key',
        'key_export': 'key',
        'key_import': 'key',
        'key_migrate-to-repokey': 'key',

        'export-tar': 'tar',

        'benchmark_crud': 'benchmark',

        'umount': 'mount',
    }

    def initialize_options(self):
        pass

    def finalize_options(self):
        pass

    def run(self):
        print('building man pages (in docs/man)', file=sys.stderr)
        import borg
        borg.doc_mode = 'build_man'
        os.makedirs('docs/man', exist_ok=True)
        # allows us to build docs without the C modules fully loaded during help generation
        from borg.archiver import Archiver
        parser = Archiver(prog='borg').build_parser()
        borgfs_parser = Archiver(prog='borgfs').build_parser()

        self.generate_level('', parser, Archiver, {'borgfs': borgfs_parser})
        self.build_topic_pages(Archiver)
        self.build_intro_page()

    def generate_level(self, prefix, parser, Archiver, extra_choices=None):
        is_subcommand = False
        choices = {}
        for action in parser._actions:
            if action.choices is not None and 'SubParsersAction' in str(action.__class__):
                is_subcommand = True
                for cmd, parser in action.choices.items():
                    choices[prefix + cmd] = parser
        if extra_choices is not None:
            choices.update(extra_choices)
        if prefix and not choices:
            return

        for command, parser in sorted(choices.items()):
            if command.startswith('debug') or command == 'help':
                continue

            if command == "borgfs":
                man_title = command
            else:
                man_title = 'borg-' + command.replace(' ', '-')
            print('building man page', man_title + '(1)', file=sys.stderr)

            is_intermediary = self.generate_level(command + ' ', parser, Archiver)

            doc, write = self.new_doc()
            self.write_man_header(write, man_title, parser.description)

            self.write_heading(write, 'SYNOPSIS')
            if is_intermediary:
                subparsers = [action for action in parser._actions if 'SubParsersAction' in str(action.__class__)][0]
                for subcommand in subparsers.choices:
                    write('| borg', '[common options]', command, subcommand, '...')
                    self.see_also.setdefault(command, []).append('%s-%s' % (command, subcommand))
            else:
                if command == "borgfs":
                    write(command, end='')
                else:
                    write('borg', '[common options]', command, end='')
                self.write_usage(write, parser)
            write('\n')

            description, _, notes = parser.epilog.partition('\n.. man NOTES')

            if description:
                self.write_heading(write, 'DESCRIPTION')
                write(description)

            if not is_intermediary:
                self.write_heading(write, 'OPTIONS')
                write('See `borg-common(1)` for common options of Borg commands.')
                write()
                self.write_options(write, parser)

                self.write_examples(write, command)

            if notes:
                self.write_heading(write, 'NOTES')
                write(notes)

            self.write_see_also(write, man_title)

            self.gen_man_page(man_title, doc.getvalue())

        # Generate the borg-common(1) man page with the common options.
        if 'create' in choices:
            doc, write = self.new_doc()
            man_title = 'borg-common'
            self.write_man_header(write, man_title, 'Common options of Borg commands')

            common_options = [group for group in choices['create']._action_groups if group.title == 'Common options'][0]

            self.write_heading(write, 'SYNOPSIS')
            self.write_options_group(write, common_options)
            self.write_see_also(write, man_title)
            self.gen_man_page(man_title, doc.getvalue())

        return is_subcommand

    def build_topic_pages(self, Archiver):
        for topic, text in Archiver.helptext.items():
            doc, write = self.new_doc()
            man_title = 'borg-' + topic
            print('building man page', man_title + '(1)', file=sys.stderr)

            self.write_man_header(write, man_title, 'Details regarding ' + topic)
            self.write_heading(write, 'DESCRIPTION')
            write(text)
            self.gen_man_page(man_title, doc.getvalue())

    def build_intro_page(self):
        print('building man page borg(1)', file=sys.stderr)
        with open('docs/man_intro.rst') as fd:
            man_intro = fd.read()
        self.gen_man_page('borg', self.rst_prelude + man_intro)

    def new_doc(self):
        doc = io.StringIO(self.rst_prelude)
        doc.read()
        write = self.printer(doc)
        return doc, write

    def printer(self, fd):
        def write(*args, **kwargs):
            print(*args, file=fd, **kwargs)
        return write

    def write_heading(self, write, header, char='-', double_sided=False):
        write()
        if double_sided:
            write(char * len(header))
        write(header)
        write(char * len(header))
        write()

    def write_man_header(self, write, title, description):
        self.write_heading(write, title, '=', double_sided=True)
        self.write_heading(write, description, double_sided=True)
        # man page metadata
        write(':Author: The Borg Collective')
        write(':Date:', datetime.utcnow().date().isoformat())
        write(':Manual section: 1')
        write(':Manual group: borg backup tool')
        write()

    def write_examples(self, write, command):
        command = command.replace(' ', '_')
        with open('docs/usage/%s.rst' % self.usage_group.get(command, command)) as fd:
            usage = fd.read()
            usage_include = '.. include:: %s.rst.inc' % command
            begin = usage.find(usage_include)
            end = usage.find('.. include', begin + 1)
            # If a command has a dedicated anchor, it will occur before the command's include.
            if 0 < usage.find('.. _', begin + 1) < end:
                end = usage.find('.. _', begin + 1)
            examples = usage[begin:end]
            examples = examples.replace(usage_include, '')
            examples = examples.replace('Examples\n~~~~~~~~', '')
            examples = examples.replace('Miscellaneous Help\n------------------', '')
            examples = examples.replace('``docs/misc/prune-example.txt``:', '``docs/misc/prune-example.txt``.')
            examples = examples.replace('.. highlight:: none\n', '')  # we don't support highlight
            examples = re.sub('^(~+)$', lambda matches: '+' * len(matches.group(0)), examples, flags=re.MULTILINE)
            examples = examples.strip()
        if examples:
            self.write_heading(write, 'EXAMPLES', '-')
            write(examples)

    def write_see_also(self, write, man_title):
        see_also = self.see_also.get(man_title.replace('borg-', ''), ())
        see_also = ['`borg-%s(1)`' % s for s in see_also]
        see_also.insert(0, '`borg-common(1)`')
        self.write_heading(write, 'SEE ALSO')
        write(', '.join(see_also))

    def gen_man_page(self, name, rst):
        from docutils.writers import manpage
        from docutils.core import publish_string
        from docutils.nodes import inline
        from docutils.parsers.rst import roles

        def issue(name, rawtext, text, lineno, inliner, options={}, content=[]):
            return [inline(rawtext, '#' + text)], []

        roles.register_local_role('issue', issue)
        # We give the source_path so that docutils can find relative includes
        # as-if the document where located in the docs/ directory.
        man_page = publish_string(source=rst, source_path='docs/%s.rst' % name, writer=manpage.Writer())
        with open('docs/man/%s.1' % name, 'wb') as fd:
            fd.write(man_page)

    def write_usage(self, write, parser):
        if any(len(o.option_strings) for o in parser._actions):
            write(' [options] ', end='')
        for option in parser._actions:
            if option.option_strings:
                continue
            write(format_metavar(option), end=' ')

    def write_options(self, write, parser):
        for group in parser._action_groups:
            if group.title == 'Common options' or not group._group_actions:
                continue
            title = 'arguments' if group.title == 'positional arguments' else group.title
            self.write_heading(write, title, '+')
            self.write_options_group(write, group)

    def write_options_group(self, write, group):
        def is_positional_group(group):
            return any(not o.option_strings for o in group._group_actions)

        if is_positional_group(group):
            for option in group._group_actions:
                write(option.metavar)
                write(textwrap.indent(option.help or '', ' ' * 4))
            return

        opts = OrderedDict()

        for option in group._group_actions:
            if option.metavar:
                option_fmt = '%s ' + option.metavar
            else:
                option_fmt = '%s'
            option_str = ', '.join(option_fmt % s for s in option.option_strings)
            option_desc = textwrap.dedent((option.help or '') % option.__dict__)
            opts[option_str] = textwrap.indent(option_desc, ' ' * 4)

        padding = len(max(opts)) + 1

        for option, desc in opts.items():
            write(option.ljust(padding), desc)


def rm(file):
    try:
        os.unlink(file)
        print('rm', file)
    except FileNotFoundError:
        pass


class Clean(clean):
    def run(self):
        super().run()
        for source in cython_sources:
            genc = source.replace('.pyx', '.c')
            rm(genc)
            compiled_glob = source.replace('.pyx', '.cpython*')
            for compiled in sorted(glob(compiled_glob)):
                rm(compiled)

cmdclass = {
    'build_ext': build_ext,
    'build_usage': build_usage,
    'build_man': build_man,
    'sdist': Sdist,
    'clean': Clean,
}

ext_modules = []
if not on_rtd:
    compress_ext_kwargs = dict(sources=[compress_source], include_dirs=include_dirs, library_dirs=library_dirs,
                               define_macros=define_macros)
    compress_ext_kwargs = setup_lz4.lz4_ext_kwargs(bundled_path='src/borg/algorithms/lz4',
                                                   system_prefix=liblz4_prefix, system=liblz4_system,
                                                   **compress_ext_kwargs)
    compress_ext_kwargs = setup_zstd.zstd_ext_kwargs(bundled_path='src/borg/algorithms/zstd',
                                                     system_prefix=libzstd_prefix, system=libzstd_system,
                                                     multithreaded=False, legacy=False, **compress_ext_kwargs)
    ext_modules += [
        Extension('borg.compress', **compress_ext_kwargs),
        Extension('borg.crypto.low_level', [crypto_ll_source, crypto_helpers], libraries=crypto_libraries,
                  include_dirs=include_dirs, library_dirs=library_dirs, define_macros=define_macros),
        Extension('borg.hashindex', [hashindex_source]),
        Extension('borg.item', [item_source]),
        Extension('borg.chunker', [chunker_source]),
        Extension('borg.algorithms.checksums', [checksums_source]),
    ]
    if not sys.platform.startswith(('win32', )):
        ext_modules.append(Extension('borg.platform.posix', [platform_posix_source]))
    if sys.platform == 'linux':
        ext_modules.append(Extension('borg.platform.linux', [platform_linux_source], libraries=['acl']))
    elif sys.platform.startswith('freebsd'):
        ext_modules.append(Extension('borg.platform.freebsd', [platform_freebsd_source]))
    elif sys.platform == 'darwin':
        ext_modules.append(Extension('borg.platform.darwin', [platform_darwin_source]))

setup(
    name='borgbackup',
    use_scm_version={
        'write_to': 'src/borg/_version.py',
    },
    author='The Borg Collective (see AUTHORS file)',
    author_email='borgbackup@python.org',
    url='https://borgbackup.readthedocs.io/',
    description='Deduplicated, encrypted, authenticated and compressed backups',
    long_description=long_description,
    license='BSD',
    platforms=['Linux', 'MacOS X', 'FreeBSD', 'OpenBSD', 'NetBSD', ],
    classifiers=[
        'Development Status :: 2 - Pre-Alpha',
        'Environment :: Console',
        'Intended Audience :: System Administrators',
        'License :: OSI Approved :: BSD License',
        'Operating System :: POSIX :: BSD :: FreeBSD',
        'Operating System :: POSIX :: BSD :: OpenBSD',
        'Operating System :: POSIX :: BSD :: NetBSD',
        'Operating System :: MacOS :: MacOS X',
        'Operating System :: POSIX :: Linux',
        'Programming Language :: Python',
        'Programming Language :: Python :: 3',
        'Programming Language :: Python :: 3.5',
        'Programming Language :: Python :: 3.6',
        'Topic :: Security :: Cryptography',
        'Topic :: System :: Archiving :: Backup',
    ],
    packages=find_packages('src'),
    package_dir={'': 'src'},
    zip_safe=False,
    entry_points={
        'console_scripts': [
            'borg = borg.archiver:main',
            'borgfs = borg.archiver:main',
        ]
    },
    # See also the MANIFEST.in file.
    # We want to install all the files in the package directories...
    include_package_data=True,
    # ...except the source files which have been compiled (C extensions):
    exclude_package_data={
        '': ['*.c', '*.h', '*.pyx', ],
    },
    cmdclass=cmdclass,
    ext_modules=ext_modules,
    setup_requires=['setuptools_scm>=1.7'],
    install_requires=install_requires,
    extras_require=extras_require,
)