annotate setup.py @ 40918:3764330f76a6

sparse-revlog: enabled by default

The feature provides large benefits. It now seems mature enough to be enabled
by default.

* It solves catastrophic issues regarding delta storage in revlog,
* It allows for shorter delta chain in all repositories, improving
  performances.

Running benchmark of a wide range of operation did not reveal problematic
impact. Performance gains are observed where expected.

The format is supported by Mercurial version 4.7. So it seems safe to enable
it by default now.

Here is a reminder of key numbers regarding this delta strategy effect on
repository size and performance.

Effect on Size:
===============

For repositories with a lot of branches, sparse-revlog significantly improve
size, fixing limitation associated with the span of a delta chain. In
addition, sparse-revlog, deal well with limitations of the delta chain length.
For large repositories, this allows for a stiff reduction of the delta chain
without a problematic impact on the repository size. This delta chain length
improvement helps all repositories, not just the ones with many branches.


As a reminder, here are the default chain limits for each "format":
  * no-sparse: none
  * sparse:    1000

Mercurial
---------

    Manifest Size:
        limit       | none        |        1000
        ------------|-------------|------------
        no-sparse   |   6 143 044 |  6 269 496
        sparse      |   5 798 796 |  5 827 025

    Manifest Chain length data
        limit       ||       none        ||       1000
        value       || average |   max   || average |   max
        ------------||---------|---------||---------|---------
        no-sparse   ||     429 |   1 397 ||     397 |    1 000
        sparse      ||     326 |   1 290 ||     313 |    1 000

    Full Store Size
        limit       | none        |        1000
        ------------|-------------|------------
        no-sparse   |  46 944 775 | 47 166 129
        sparse      |  46 622 445 | 46 723 774

pypy
----

    Manifest Size:
        limit       | none        |        1000
        ------------|-------------|------------
        no-sparse   |  52 941 760 |  56 200 970
        sparse      |  26 348 229 |  27 384 133

    Manifest Chain length data
        limit       ||       none        ||       1000
        value       || average |   max   || average |   max
        ------------||---------|---------||---------|---------
        no-sparse   ||     769 |   3 889 ||     390 |    1 000
        sparse      ||   1 223 |   3 846 ||     495 |    1 000

    Full Store Size
        limit       | none        |        1000
        ------------|-------------|------------
        no-sparse   | 336 050 203 | 339 309 413
        sparse      | 338 673 985 | 339 709 889

Mozilla
-------

    Manifest Size:
        limit       | none           |        1000
        ------------|----------------|---------------
        no-sparse   |    215 096 339 |  1 708 853 525
        sparse      |    188 947 271 |    278 894 170

    Manifest Chain length data
        limit       ||       none        ||       1000
        value       || average |   max   || average |   max
        ------------||---------|---------||---------|--------
        no-sparse   ||  20 454 |  59 562 ||     491 |   1 000
        sparse      ||  23 509 |  69 891 ||     489 |   1 000

    Full Store Size
        limit       | none           |        1000
        ------------|----------------|---------------
        no-sparse   |  2 377 578 715 |  3 876 258 798
        sparse      |  2 441 677 137 |  2 535 997 381

Netbeans
--------

    Manifest Size:
        limit       | none           |        1000
        ------------|----------------|---------------
        no-sparse   |    130 088 982 |    741 590 565
        sparse      |    118 836 887 |    159 161 207

    Manifest Chain length data
        limit       ||       none        ||       1000
        value       || average |   max   || average |   max
        ------------||---------|---------||---------|---------
        no-sparse   ||  19 321 |  61 397 ||     510 |    1 000
        sparse      ||  21 240 |  61 583 ||     503 |    1 000

    Full Store Size
        limit       | none           |        1000
        ------------|----------------|---------------
        no-sparse   |  1 160 013 008 |  1 771 514 591
        sparse      |  1 164 959 988 |  1 205 284 308

Private repo #1
---------------

    Manifest Size:
        limit       | none            |        1000
        ------------|-----------------|---------------
        no-sparse   | 33 725 285 081  | 33 724 834 190
        sparse      |    350 542 420  |    423 470 579

     Manifest Chain length data
         limit       ||       none        ||       1000
         value       || average |   max   || average |   max
         ------------||---------|---------||---------|---------
         no-sparse   ||     282 |   8 885 ||     113 |    1 000
         snapshot    ||   3 655 |   8 951 ||     530 |    1 000

    Full Store Size
        limit       | none           |        1000
        ------------|----------------|---------------
        no-sparse   | 41 544 149 652 | 41 543 698 761
        sparse      |  8 448 037 300 |  8 520 965 459

Effect on speed:
================

Performances are strongly impacted by the delta chain length. Longer chain
results in slower revision restoration. For this reason, the 1000 chain limit
introduced by sparse-revlog helps repository with previously large chains a
lot. In our corpus, this means `netbeans` and `mozilla-central` who suffered
from unreasonable manifest delta chain length.

Another way sparse revlog helps, is by producing better delta's. For
repositories with many branches, the pathological patterns that resulted in
many sub-optimal deltas are gone. Smaller delta help with operations where
deltas are directly relevant, like bundle.

However, the sparse-revlog logic introduces some extra processing and a more
throughout testing of possible delta candidates. Adding an extra cost in some
cases. This cost is usually counterbalanced by the other performance gain.
However, for smaller repositories not affected by delta chain length issues or
branching related issues, this might make things a bit slower. However, these
are also repository where revlog performance is dwarfed by other costs.

Below are the summary of some timing from the performance test suite running
at `http://perf.octobus.net/` for a handful of key commands and operation.

It is important to keep in mind that most of this command works on the tip
part of the repository. The non-sparse and sparse version produce different
delta chains and the tip revision can end up at an arbitrary point of these
chains. This will impact some performance number listed in this summary.

For the record: here is the delta chain length for the tip revision of
manifest log in the benchmarked repository:

              |  no-sparse |   sparse   |
    mercurial |         94 |        904 |
    pypy      |         23 |        673 |
    netbeans  |       4158 |        258 |
    mozilla   |      63263 |        781 |

As you can see, the chain length for mercurial and pypy turn out to be
significantly longer. The netbeans and mozilla one get shorter because these
repositories benefit from the maximum chain length.

Timing for `hg commit`:
-----------------------

The time taken by `hg commit` does not varies significantly, no drawback for
using sparse here.

              |  no-sparse |   sparse   |
    mercurial |     68.1ms |     66.7ms |
    pypy      |     95.0ms |     94.1ms |
    netbeans  |    614.0ms |    611.0ms |
    mozilla   |   1340.0ms |  1.320.0ms |

Check the final section for statistics on a wider array of write.

Timing for bundling 10 000 changesets
-------------------------------------

The repository that benefits from better delta see a good performance boost.
The other ones are not significantly affected.

              |  no-sparse |   sparse  |
    mercurial |       3.1s |      3.0s |
    pypy      |      25.1s |      7.5s |
    netbeans  |      24.2s |     17.0s |
    mozilla   |      23.7s |     25.0s |

Timing for unbundling 1 000 changesets
--------------------------------------

Mercurial and mozilla are unaffected. The pypy repository benefit well from
the better delta.

However, the netbeans repository takes a visible hit. Digging that difference
reveals that it comes from the sparse-revlog bundle having to deal with a
snapshot that was re-encoded in the bundle. The slow path for adding new a revision
had to be triggered for it, slowing things down. The Sparse versions do not have
such snapshot to handle similar cases in the tested configuration.

              |  no-sparse |   sparse   |
    mercurial |      519ms |      502ms |
    pypy      |    1.270ms |      886ms |
    netbeans  |    1.370ms |    2.250ms |
    mozilla   |    3.230ms |    3.210ms |

Netbeans benefits from the better deltas in other dimensions too. For
example, the produced bundle is significantly smaller:

      * netbeans-no-sparse.hg: 2.3MB
      * netbeans-sparse.hg:    1.9MB


Timing to restore the tip most manifest entry:
----------------------------------------------

Nothing surprising here. The timing for mercurial and pypy are within a small
range where they won't affect performance much. In our tested case, they are
slower as they use a longer chain.

Timing for netbeans and mozilla improves a lot. Removing a significant amount
of time.

              |  no-sparse |   sparse   |
    mercurial |     1.09ms |     3.15ms |
    pypy      |     4.11ms |    10.70ms |
    netbeans  |   239.00ms |   112.00ms |
    mozilla   |   688.00ms |   198.00ms |

Reading 100 revision in descending order:
-----------------------------------------

We see the same kind of effect when reading the last 100 revisions. Large
boost for netbeans and mozilla, as they use much smaller delta chain.

Mercurial and pypy longer chain means slower reads, but nothing gets out of
control.

              |  no-sparse |   sparse   |
    mercurial |     0.089s |     0.268s |
    pypy      |     0.259s |     0.698s |
    netbeans  |   125.000s |    20.600s |
    mozilla   |    23.000s |    11.400s |


Writing from full text: statistic for the last 30K revisions
------------------------------------------------------------

This benchmark adds revisions to revlog from their full text. This is similar
to the work done during a commit, but for a large amount of revisions so that
we get a more relevant view.

We see better overall performances with sparse-revlog. The very worst case is
usually slower with sparse-revlog, but does not gets out of control. For the
vast majorities of the other writes, sparse-revlog is significantly faster for
larger repositories. This is reflected in the accumulated rewrite time for
netbeans and mozilla.

The notable exception is the pypy repository where things get slower. The
extra processing is not balanced by shorter delta chain. However, this is to
be seen as a blocking issue. First, the overall time spend dealing with revlog
for the repository pypy size is small compared to the other costs, so we get
slower on operations that matter less than for other larger repository.
Second, we still get nice size benefit from using sparse-revlog, smaller repo
size brings other usability and speed benefit (eg: bundle size).

max time  |  no-sparse |   sparse   |
mercurial |  0.010143s |  0.045280s |
pypy      |  0.034924s |  0.243288s |
netbeans  |  0.605371s |  2.130876s |
mozilla   |  1.478342s |  3.424541s |

99% time  |  no-sparse |   sparse   |
mercurial |  0.003774s |  0.003758s |
pypy      |  0.017387s |  0.025310s |
netbeans  |  0.576913s |  0.271195s |
mozilla   |  1.478342s |  0.449661s |

95% time  |  no-sparse |   sparse   |
mercurial |  0.002069s |  0.002120s |
pypy      |  0.010141s |  0.014797s |
netbeans  |  0.540202s |  0.258644s |
mozilla   |  0.654830s |  0.243440s |

full time |  no-sparse |   sparse  |
mercurial |     14.15s |    14.87s |
pypy      |     90.50s |   137.12s |
netbeans  |   6401.06s |  3411.14s |
mozilla   |   3086.89s |  1991.97s |

Differential Revision: https://phab.mercurial-scm.org/D5345

#
# This is the mercurial setup script.
#
# 'python setup.py install', or
# 'python setup.py --help' for more options

import os

supportedpy = '~= 2.7'
if os.environ.get('HGALLOWPYTHON3', ''):
    # Mercurial will never work on Python 3 before 3.5 due to a lack
    # of % formatting on bytestrings, and can't work on 3.6.0 or 3.6.1
    # due to a bug in % formatting in bytestrings.
    # We cannot support Python 3.5.0, 3.5.1, 3.5.2 because of bug in
    # codecs.escape_encode() where it raises SystemError on empty bytestring
    # bug link: https://bugs.python.org/issue25270
    #
    # TODO: when we actually work on Python 3, use this string as the
    # actual supportedpy string.
    supportedpy = ','.join([
        '>=2.7',
        '!=3.0.*',
        '!=3.1.*',
        '!=3.2.*',
        '!=3.3.*',
        '!=3.4.*',
        '!=3.5.0',
        '!=3.5.1',
        '!=3.5.2',
        '!=3.6.0',
        '!=3.6.1',
    ])

import sys, platform
if sys.version_info[0] >= 3:
    printf = eval('print')
    libdir_escape = 'unicode_escape'
    def sysstr(s):
        return s.decode('latin-1')
else:
    libdir_escape = 'string_escape'
    def printf(*args, **kwargs):
        f = kwargs.get('file', sys.stdout)
        end = kwargs.get('end', '\n')
        f.write(b' '.join(args) + end)
    def sysstr(s):
        return s

# Attempt to guide users to a modern pip - this means that 2.6 users
# should have a chance of getting a 4.2 release, and when we ratchet
# the version requirement forward again hopefully everyone will get
# something that works for them.
if sys.version_info < (2, 7, 0, 'final'):
    pip_message = ('This may be due to an out of date pip. '
                   'Make sure you have pip >= 9.0.1.')
    try:
        import pip
        pip_version = tuple([int(x) for x in pip.__version__.split('.')[:3]])
        if pip_version < (9, 0, 1) :
            pip_message = (
                'Your pip version is out of date, please install '
                'pip >= 9.0.1. pip {} detected.'.format(pip.__version__))
        else:
            # pip is new enough - it must be something else
            pip_message = ''
    except Exception:
        pass
    error = """
Mercurial does not support Python older than 2.7.
Python {py} detected.
{pip}
""".format(py=sys.version_info, pip=pip_message)
    printf(error, file=sys.stderr)
    sys.exit(1)

# We don't yet officially support Python 3. But we want to allow developers to
# hack on. Detect and disallow running on Python 3 by default. But provide a
# backdoor to enable working on Python 3.
if sys.version_info[0] != 2:
    badpython = True

    # Allow Python 3 from source checkouts.
    if os.path.isdir('.hg') or 'HGPYTHON3' in os.environ:
        badpython = False

    if badpython:
        error = """
Mercurial only supports Python 2.7.
Python {py} detected.
Please re-run with Python 2.7.
""".format(py=sys.version_info)

        printf(error, file=sys.stderr)
        sys.exit(1)

# Solaris Python packaging brain damage
try:
    import hashlib
    sha = hashlib.sha1()
except ImportError:
    try:
        import sha
        sha.sha # silence unused import warning
    except ImportError:
        raise SystemExit(
            "Couldn't import standard hashlib (incomplete Python install).")

try:
    import zlib
    zlib.compressobj # silence unused import warning
except ImportError:
    raise SystemExit(
        "Couldn't import standard zlib (incomplete Python install).")

# The base IronPython distribution (as of 2.7.1) doesn't support bz2
isironpython = False
try:
    isironpython = (platform.python_implementation()
                    .lower().find("ironpython") != -1)
except AttributeError:
    pass

if isironpython:
    sys.stderr.write("warning: IronPython detected (no bz2 support)\n")
else:
    try:
        import bz2
        bz2.BZ2Compressor # silence unused import warning
    except ImportError:
        raise SystemExit(
            "Couldn't import standard bz2 (incomplete Python install).")

ispypy = "PyPy" in sys.version

iswithrustextensions = 'HGWITHRUSTEXT' in os.environ

import ctypes
import stat, subprocess, time
import re
import shutil
import tempfile
from distutils import log
# We have issues with setuptools on some platforms and builders. Until
# those are resolved, setuptools is opt-in except for platforms where
# we don't have issues.
issetuptools = (os.name == 'nt' or 'FORCE_SETUPTOOLS' in os.environ)
if issetuptools:
    from setuptools import setup
else:
    from distutils.core import setup
from distutils.ccompiler import new_compiler
from distutils.core import Command, Extension
from distutils.dist import Distribution
from distutils.command.build import build
from distutils.command.build_ext import build_ext
from distutils.command.build_py import build_py
from distutils.command.build_scripts import build_scripts
from distutils.command.install import install
from distutils.command.install_lib import install_lib
from distutils.command.install_scripts import install_scripts
from distutils.spawn import spawn, find_executable
from distutils import file_util
from distutils.errors import (
    CCompilerError,
    DistutilsError,
    DistutilsExecError,
)
from distutils.sysconfig import get_python_inc, get_config_var
from distutils.version import StrictVersion

# Explain to distutils.StrictVersion how our release candidates are versionned
StrictVersion.version_re = re.compile(r'^(\d+)\.(\d+)(\.(\d+))?-?(rc(\d+))?$')

def write_if_changed(path, content):
    """Write content to a file iff the content hasn't changed."""
    if os.path.exists(path):
        with open(path, 'rb') as fh:
            current = fh.read()
    else:
        current = b''

    if current != content:
        with open(path, 'wb') as fh:
            fh.write(content)

scripts = ['hg']
if os.name == 'nt':
    # We remove hg.bat if we are able to build hg.exe.
    scripts.append('contrib/win32/hg.bat')

def cancompile(cc, code):
    tmpdir = tempfile.mkdtemp(prefix='hg-install-')
    devnull = oldstderr = None
    try:
        fname = os.path.join(tmpdir, 'testcomp.c')
        f = open(fname, 'w')
        f.write(code)
        f.close()
        # Redirect stderr to /dev/null to hide any error messages
        # from the compiler.
        # This will have to be changed if we ever have to check
        # for a function on Windows.
        devnull = open('/dev/null', 'w')
        oldstderr = os.dup(sys.stderr.fileno())
        os.dup2(devnull.fileno(), sys.stderr.fileno())
        objects = cc.compile([fname], output_dir=tmpdir)
        cc.link_executable(objects, os.path.join(tmpdir, "a.out"))
        return True
    except Exception:
        return False
    finally:
        if oldstderr is not None:
            os.dup2(oldstderr, sys.stderr.fileno())
        if devnull is not None:
            devnull.close()
        shutil.rmtree(tmpdir)

# simplified version of distutils.ccompiler.CCompiler.has_function
# that actually removes its temporary files.
def hasfunction(cc, funcname):
    code = 'int main(void) { %s(); }\n' % funcname
    return cancompile(cc, code)

def hasheader(cc, headername):
    code = '#include <%s>\nint main(void) { return 0; }\n' % headername
    return cancompile(cc, code)

# py2exe needs to be installed to work
try:
    import py2exe
    py2exe.Distribution # silence unused import warning
    py2exeloaded = True
    # import py2exe's patched Distribution class
    from distutils.core import Distribution
except ImportError:
    py2exeloaded = False

def runcmd(cmd, env):
    p = subprocess.Popen(cmd, stdout=subprocess.PIPE,
                         stderr=subprocess.PIPE, env=env)
    out, err = p.communicate()
    return p.returncode, out, err

class hgcommand(object):
    def __init__(self, cmd, env):
        self.cmd = cmd
        self.env = env

    def run(self, args):
        cmd = self.cmd + args
        returncode, out, err = runcmd(cmd, self.env)
        err = filterhgerr(err)
        if err or returncode != 0:
            printf("stderr from '%s':" % (' '.join(cmd)), file=sys.stderr)
            printf(err, file=sys.stderr)
            return ''
        return out

def filterhgerr(err):
    # If root is executing setup.py, but the repository is owned by
    # another user (as in "sudo python setup.py install") we will get
    # trust warnings since the .hg/hgrc file is untrusted. That is
    # fine, we don't want to load it anyway.  Python may warn about
    # a missing __init__.py in mercurial/locale, we also ignore that.
    err = [e for e in err.splitlines()
           if (not e.startswith(b'not trusting file')
               and not e.startswith(b'warning: Not importing')
               and not e.startswith(b'obsolete feature not enabled')
               and not e.startswith(b'*** failed to import extension')
               and not e.startswith(b'devel-warn:')
               and not (e.startswith(b'(third party extension')
                        and e.endswith(b'or newer of Mercurial; disabling)')))]
    return b'\n'.join(b'  ' + e for e in err)

def findhg():
    """Try to figure out how we should invoke hg for examining the local
    repository contents.

    Returns an hgcommand object."""
    # By default, prefer the "hg" command in the user's path.  This was
    # presumably the hg command that the user used to create this repository.
    #
    # This repository may require extensions or other settings that would not
    # be enabled by running the hg script directly from this local repository.
    hgenv = os.environ.copy()
    # Use HGPLAIN to disable hgrc settings that would change output formatting,
    # and disable localization for the same reasons.
    hgenv['HGPLAIN'] = '1'
    hgenv['LANGUAGE'] = 'C'
    hgcmd = ['hg']
    # Run a simple "hg log" command just to see if using hg from the user's
    # path works and can successfully interact with this repository.
    check_cmd = ['log', '-r.', '-Ttest']
    try:
        retcode, out, err = runcmd(hgcmd + check_cmd, hgenv)
    except EnvironmentError:
        retcode = -1
    if retcode == 0 and not filterhgerr(err):
        return hgcommand(hgcmd, hgenv)

    # Fall back to trying the local hg installation.
    hgenv = localhgenv()
    hgcmd = [sys.executable, 'hg']
    try:
        retcode, out, err = runcmd(hgcmd + check_cmd, hgenv)
    except EnvironmentError:
        retcode = -1
    if retcode == 0 and not filterhgerr(err):
        return hgcommand(hgcmd, hgenv)

    raise SystemExit('Unable to find a working hg binary to extract the '
                     'version from the repository tags')

def localhgenv():
    """Get an environment dictionary to use for invoking or importing
    mercurial from the local repository."""
    # Execute hg out of this directory with a custom environment which takes
    # care to not use any hgrc files and do no localization.
    env = {'HGMODULEPOLICY': 'py',
           'HGRCPATH': '',
           'LANGUAGE': 'C',
           'PATH': ''} # make pypi modules that use os.environ['PATH'] happy
    if 'LD_LIBRARY_PATH' in os.environ:
        env['LD_LIBRARY_PATH'] = os.environ['LD_LIBRARY_PATH']
    if 'SystemRoot' in os.environ:
        # SystemRoot is required by Windows to load various DLLs.  See:
        # https://bugs.python.org/issue13524#msg148850
        env['SystemRoot'] = os.environ['SystemRoot']
    return env

version = ''

if os.path.isdir('.hg'):
    hg = findhg()
    cmd = ['log', '-r', '.', '--template', '{tags}\n']
    numerictags = [t for t in sysstr(hg.run(cmd)).split() if t[0:1].isdigit()]
    hgid = sysstr(hg.run(['id', '-i'])).strip()
    if not hgid:
        # Bail out if hg is having problems interacting with this repository,
        # rather than falling through and producing a bogus version number.
        # Continuing with an invalid version number will break extensions
        # that define minimumhgversion.
        raise SystemExit('Unable to determine hg version from local repository')
    if numerictags: # tag(s) found
        version = numerictags[-1]
        if hgid.endswith('+'): # propagate the dirty status to the tag
            version += '+'
    else: # no tag found
        ltagcmd = ['parents', '--template', '{latesttag}']
        ltag = sysstr(hg.run(ltagcmd))
        changessincecmd = ['log', '-T', 'x\n', '-r', "only(.,'%s')" % ltag]
        changessince = len(hg.run(changessincecmd).splitlines())
        version = '%s+%s-%s' % (ltag, changessince, hgid)
    if version.endswith('+'):
        version += time.strftime('%Y%m%d')
elif os.path.exists('.hg_archival.txt'):
    kw = dict([[t.strip() for t in l.split(':', 1)]
               for l in open('.hg_archival.txt')])
    if 'tag' in kw:
        version = kw['tag']
    elif 'latesttag' in kw:
        if 'changessincelatesttag' in kw:
            version = '%(latesttag)s+%(changessincelatesttag)s-%(node).12s' % kw
        else:
            version = '%(latesttag)s+%(latesttagdistance)s-%(node).12s' % kw
    else:
        version = kw.get('node', '')[:12]

if version:
    versionb = version
    if not isinstance(versionb, bytes):
        versionb = versionb.encode('ascii')

    write_if_changed('mercurial/__version__.py', b''.join([
        b'# this file is autogenerated by setup.py\n'
        b'version = b"%s"\n' % versionb,
    ]))

try:
    oldpolicy = os.environ.get('HGMODULEPOLICY', None)
    os.environ['HGMODULEPOLICY'] = 'py'
    from mercurial import __version__
    version = __version__.version
except ImportError:
    version = b'unknown'
finally:
    if oldpolicy is None:
        del os.environ['HGMODULEPOLICY']
    else:
        os.environ['HGMODULEPOLICY'] = oldpolicy

class hgbuild(build):
    # Insert hgbuildmo first so that files in mercurial/locale/ are found
    # when build_py is run next.
    sub_commands = [('build_mo', None)] + build.sub_commands

class hgbuildmo(build):

    description = "build translations (.mo files)"

    def run(self):
        if not find_executable('msgfmt'):
            self.warn("could not find msgfmt executable, no translations "
                     "will be built")
            return

        podir = 'i18n'
        if not os.path.isdir(podir):
            self.warn("could not find %s/ directory" % podir)
            return

        join = os.path.join
        for po in os.listdir(podir):
            if not po.endswith('.po'):
                continue
            pofile = join(podir, po)
            modir = join('locale', po[:-3], 'LC_MESSAGES')
            mofile = join(modir, 'hg.mo')
            mobuildfile = join('mercurial', mofile)
            cmd = ['msgfmt', '-v', '-o', mobuildfile, pofile]
            if sys.platform != 'sunos5':
                # msgfmt on Solaris does not know about -c
                cmd.append('-c')
            self.mkpath(join('mercurial', modir))
            self.make_file([pofile], mobuildfile, spawn, (cmd,))


class hgdist(Distribution):
    pure = False
    cffi = ispypy

    global_options = Distribution.global_options + \
                     [('pure', None, "use pure (slow) Python "
                        "code instead of C extensions"),
                     ]

    def has_ext_modules(self):
        # self.ext_modules is emptied in hgbuildpy.finalize_options which is
        # too late for some cases
        return not self.pure and Distribution.has_ext_modules(self)

# This is ugly as a one-liner. So use a variable.
buildextnegops = dict(getattr(build_ext, 'negative_options', {}))
buildextnegops['no-zstd'] = 'zstd'

class hgbuildext(build_ext):
    user_options = build_ext.user_options + [
        ('zstd', None, 'compile zstd bindings [default]'),
        ('no-zstd', None, 'do not compile zstd bindings'),
    ]

    boolean_options = build_ext.boolean_options + ['zstd']
    negative_opt = buildextnegops

    def initialize_options(self):
        self.zstd = True
        return build_ext.initialize_options(self)

    def build_extensions(self):
        # Filter out zstd if disabled via argument.
        if not self.zstd:
            self.extensions = [e for e in self.extensions
                               if e.name != 'mercurial.zstd']

        return build_ext.build_extensions(self)

    def build_extension(self, ext):
        if isinstance(ext, RustExtension):
            ext.rustbuild()
        try:
            build_ext.build_extension(self, ext)
        except CCompilerError:
            if not getattr(ext, 'optional', False):
                raise
            log.warn("Failed to build optional extension '%s' (skipping)",
                     ext.name)

class hgbuildscripts(build_scripts):
    def run(self):
        if os.name != 'nt' or self.distribution.pure:
            return build_scripts.run(self)

        exebuilt = False
        try:
            self.run_command('build_hgexe')
            exebuilt = True
        except (DistutilsError, CCompilerError):
            log.warn('failed to build optional hg.exe')

        if exebuilt:
            # Copying hg.exe to the scripts build directory ensures it is
            # installed by the install_scripts command.
            hgexecommand = self.get_finalized_command('build_hgexe')
            dest = os.path.join(self.build_dir, 'hg.exe')
            self.mkpath(self.build_dir)
            self.copy_file(hgexecommand.hgexepath, dest)

            # Remove hg.bat because it is redundant with hg.exe.
            self.scripts.remove('contrib/win32/hg.bat')

        return build_scripts.run(self)

class hgbuildpy(build_py):
    def finalize_options(self):
        build_py.finalize_options(self)

        if self.distribution.pure:
            self.distribution.ext_modules = []
        elif self.distribution.cffi:
            from mercurial.cffi import (
                bdiffbuild,
                mpatchbuild,
            )
            exts = [mpatchbuild.ffi.distutils_extension(),
                    bdiffbuild.ffi.distutils_extension()]
            # cffi modules go here
            if sys.platform == 'darwin':
                from mercurial.cffi import osutilbuild
                exts.append(osutilbuild.ffi.distutils_extension())
            self.distribution.ext_modules = exts
        else:
            h = os.path.join(get_python_inc(), 'Python.h')
            if not os.path.exists(h):
                raise SystemExit('Python headers are required to build '
                                 'Mercurial but weren\'t found in %s' % h)

    def run(self):
        basepath = os.path.join(self.build_lib, 'mercurial')
        self.mkpath(basepath)

        if self.distribution.pure:
            modulepolicy = 'py'
        elif self.build_lib == '.':
            # in-place build should run without rebuilding C extensions
            modulepolicy = 'allow'
        else:
            modulepolicy = 'c'

        content = b''.join([
            b'# this file is autogenerated by setup.py\n',
            b'modulepolicy = b"%s"\n' % modulepolicy.encode('ascii'),
        ])
        write_if_changed(os.path.join(basepath, '__modulepolicy__.py'),
                         content)

        build_py.run(self)

class buildhgextindex(Command):
    description = 'generate prebuilt index of hgext (for frozen package)'
    user_options = []
    _indexfilename = 'hgext/__index__.py'

    def initialize_options(self):
        pass

    def finalize_options(self):
        pass

    def run(self):
        if os.path.exists(self._indexfilename):
            with open(self._indexfilename, 'w') as f:
                f.write('# empty\n')

        # here no extension enabled, disabled() lists up everything
        code = ('import pprint; from mercurial import extensions; '
                'pprint.pprint(extensions.disabled())')
        returncode, out, err = runcmd([sys.executable, '-c', code],
                                      localhgenv())
        if err or returncode != 0:
            raise DistutilsExecError(err)

        with open(self._indexfilename, 'w') as f:
            f.write('# this file is autogenerated by setup.py\n')
            f.write('docs = ')
            f.write(out)

class buildhgexe(build_ext):
    description = 'compile hg.exe from mercurial/exewrapper.c'
    user_options = build_ext.user_options + [
        ('long-paths-support', None, 'enable support for long paths on '
                                     'Windows (off by default and '
                                     'experimental)'),
    ]

    LONG_PATHS_MANIFEST = """
    <?xml version="1.0" encoding="UTF-8" standalone="yes"?>
    <assembly xmlns="urn:schemas-microsoft-com:asm.v1" manifestVersion="1.0">
        <application>
            <windowsSettings
            xmlns:ws2="http://schemas.microsoft.com/SMI/2016/WindowsSettings">
                <ws2:longPathAware>true</ws2:longPathAware>
            </windowsSettings>
        </application>
    </assembly>"""

    def initialize_options(self):
        build_ext.initialize_options(self)
        self.long_paths_support = False

    def build_extensions(self):
        if os.name != 'nt':
            return
        if isinstance(self.compiler, HackedMingw32CCompiler):
            self.compiler.compiler_so = self.compiler.compiler # no -mdll
            self.compiler.dll_libraries = [] # no -lmsrvc90

        # Different Python installs can have different Python library
        # names. e.g. the official CPython distribution uses pythonXY.dll
        # and MinGW uses libpythonX.Y.dll.
        _kernel32 = ctypes.windll.kernel32
        _kernel32.GetModuleFileNameA.argtypes = [ctypes.c_void_p,
                                                 ctypes.c_void_p,
                                                 ctypes.c_ulong]
        _kernel32.GetModuleFileNameA.restype = ctypes.c_ulong
        size = 1000
        buf = ctypes.create_string_buffer(size + 1)
        filelen = _kernel32.GetModuleFileNameA(sys.dllhandle, ctypes.byref(buf),
                                               size)

        if filelen > 0 and filelen != size:
            dllbasename = os.path.basename(buf.value)
            if not dllbasename.lower().endswith(b'.dll'):
                raise SystemExit('Python DLL does not end with .dll: %s' %
                                 dllbasename)
            pythonlib = dllbasename[:-4]
        else:
            log.warn('could not determine Python DLL filename; '
                     'assuming pythonXY')

            hv = sys.hexversion
            pythonlib = 'python%d%d' % (hv >> 24, (hv >> 16) & 0xff)

        log.info('using %s as Python library name' % pythonlib)
        with open('mercurial/hgpythonlib.h', 'wb') as f:
            f.write(b'/* this file is autogenerated by setup.py */\n')
            f.write(b'#define HGPYTHONLIB "%s"\n' % pythonlib)

        macros = None
        if sys.version_info[0] >= 3:
            macros = [('_UNICODE', None), ('UNICODE', None)]

        objects = self.compiler.compile(['mercurial/exewrapper.c'],
                                         output_dir=self.build_temp,
                                         macros=macros)
        dir = os.path.dirname(self.get_ext_fullpath('dummy'))
        self.hgtarget = os.path.join(dir, 'hg')
        self.compiler.link_executable(objects, self.hgtarget,
                                      libraries=[],
                                      output_dir=self.build_temp)
        if self.long_paths_support:
            self.addlongpathsmanifest()

    def addlongpathsmanifest(self):
        """Add manifest pieces so that hg.exe understands long paths

        This is an EXPERIMENTAL feature, use with care.
        To enable long paths support, one needs to do two things:
        - build Mercurial with --long-paths-support option
        - change HKLM\SYSTEM\CurrentControlSet\Control\FileSystem\
                 LongPathsEnabled to have value 1.

        Please ignore 'warning 81010002: Unrecognized Element "longPathAware"';
        it happens because Mercurial uses mt.exe circa 2008, which is not
        yet aware of long paths support in the manifest (I think so at least).
        This does not stop mt.exe from embedding/merging the XML properly.

        Why resource #1 should be used for .exe manifests? I don't know and
        wasn't able to find an explanation for mortals. But it seems to work.
        """
        exefname = self.compiler.executable_filename(self.hgtarget)
        fdauto, manfname = tempfile.mkstemp(suffix='.hg.exe.manifest')
        os.close(fdauto)
        with open(manfname, 'w') as f:
            f.write(self.LONG_PATHS_MANIFEST)
        log.info("long paths manifest is written to '%s'" % manfname)
        inputresource = '-inputresource:%s;#1' % exefname
        outputresource = '-outputresource:%s;#1' % exefname
        log.info("running mt.exe to update hg.exe's manifest in-place")
        # supplying both -manifest and -inputresource to mt.exe makes
        # it merge the embedded and supplied manifests in the -outputresource
        self.spawn(['mt.exe', '-nologo', '-manifest', manfname,
                    inputresource, outputresource])
        log.info("done updating hg.exe's manifest")
        os.remove(manfname)

    @property
    def hgexepath(self):
        dir = os.path.dirname(self.get_ext_fullpath('dummy'))
        return os.path.join(self.build_temp, dir, 'hg.exe')

class hginstall(install):

    user_options = install.user_options + [
        ('old-and-unmanageable', None,
         'noop, present for eggless setuptools compat'),
        ('single-version-externally-managed', None,
         'noop, present for eggless setuptools compat'),
    ]

    # Also helps setuptools not be sad while we refuse to create eggs.
    single_version_externally_managed = True

    def get_sub_commands(self):
        # Screen out egg related commands to prevent egg generation.  But allow
        # mercurial.egg-info generation, since that is part of modern
        # packaging.
        excl = set(['bdist_egg'])
        return filter(lambda x: x not in excl, install.get_sub_commands(self))

class hginstalllib(install_lib):
    '''
    This is a specialization of install_lib that replaces the copy_file used
    there so that it supports setting the mode of files after copying them,
    instead of just preserving the mode that the files originally had.  If your
    system has a umask of something like 027, preserving the permissions when
    copying will lead to a broken install.

    Note that just passing keep_permissions=False to copy_file would be
    insufficient, as it might still be applying a umask.
    '''

    def run(self):
        realcopyfile = file_util.copy_file
        def copyfileandsetmode(*args, **kwargs):
            src, dst = args[0], args[1]
            dst, copied = realcopyfile(*args, **kwargs)
            if copied:
                st = os.stat(src)
                # Persist executable bit (apply it to group and other if user
                # has it)
                if st[stat.ST_MODE] & stat.S_IXUSR:
                    setmode = int('0755', 8)
                else:
                    setmode = int('0644', 8)
                m = stat.S_IMODE(st[stat.ST_MODE])
                m = (m & ~int('0777', 8)) | setmode
                os.chmod(dst, m)
        file_util.copy_file = copyfileandsetmode
        try:
            install_lib.run(self)
        finally:
            file_util.copy_file = realcopyfile

class hginstallscripts(install_scripts):
    '''
    This is a specialization of install_scripts that replaces the @LIBDIR@ with
    the configured directory for modules. If possible, the path is made relative
    to the directory for scripts.
    '''

    def initialize_options(self):
        install_scripts.initialize_options(self)

        self.install_lib = None

    def finalize_options(self):
        install_scripts.finalize_options(self)
        self.set_undefined_options('install',
                                   ('install_lib', 'install_lib'))

    def run(self):
        install_scripts.run(self)

        # It only makes sense to replace @LIBDIR@ with the install path if
        # the install path is known. For wheels, the logic below calculates
        # the libdir to be "../..". This is because the internal layout of a
        # wheel archive looks like:
        #
        #   mercurial-3.6.1.data/scripts/hg
        #   mercurial/__init__.py
        #
        # When installing wheels, the subdirectories of the "<pkg>.data"
        # directory are translated to system local paths and files therein
        # are copied in place. The mercurial/* files are installed into the
        # site-packages directory. However, the site-packages directory
        # isn't known until wheel install time. This means we have no clue
        # at wheel generation time what the installed site-packages directory
        # will be. And, wheels don't appear to provide the ability to register
        # custom code to run during wheel installation. This all means that
        # we can't reliably set the libdir in wheels: the default behavior
        # of looking in sys.path must do.

        if (os.path.splitdrive(self.install_dir)[0] !=
            os.path.splitdrive(self.install_lib)[0]):
            # can't make relative paths from one drive to another, so use an
            # absolute path instead
            libdir = self.install_lib
        else:
            common = os.path.commonprefix((self.install_dir, self.install_lib))
            rest = self.install_dir[len(common):]
            uplevel = len([n for n in os.path.split(rest) if n])

            libdir = uplevel * ('..' + os.sep) + self.install_lib[len(common):]

        for outfile in self.outfiles:
            with open(outfile, 'rb') as fp:
                data = fp.read()

            # skip binary files
            if b'\0' in data:
                continue

            # During local installs, the shebang will be rewritten to the final
            # install path. During wheel packaging, the shebang has a special
            # value.
            if data.startswith(b'#!python'):
                log.info('not rewriting @LIBDIR@ in %s because install path '
                         'not known' % outfile)
                continue

            data = data.replace(b'@LIBDIR@', libdir.encode(libdir_escape))
            with open(outfile, 'wb') as fp:
                fp.write(data)

cmdclass = {'build': hgbuild,
            'build_mo': hgbuildmo,
            'build_ext': hgbuildext,
            'build_py': hgbuildpy,
            'build_scripts': hgbuildscripts,
            'build_hgextindex': buildhgextindex,
            'install': hginstall,
            'install_lib': hginstalllib,
            'install_scripts': hginstallscripts,
            'build_hgexe': buildhgexe,
            }

packages = ['mercurial',
            'mercurial.cext',
            'mercurial.cffi',
            'mercurial.hgweb',
            'mercurial.pure',
            'mercurial.thirdparty',
            'mercurial.thirdparty.attr',
            'mercurial.thirdparty.cbor',
            'mercurial.thirdparty.cbor.cbor2',
            'mercurial.thirdparty.zope',
            'mercurial.thirdparty.zope.interface',
            'mercurial.utils',
            'mercurial.revlogutils',
            'mercurial.testing',
            'hgext', 'hgext.convert', 'hgext.fsmonitor',
            'hgext.fastannotate',
            'hgext.fsmonitor.pywatchman',
            'hgext.infinitepush',
            'hgext.highlight',
            'hgext.largefiles', 'hgext.lfs', 'hgext.narrow',
            'hgext.remotefilelog',
            'hgext.zeroconf', 'hgext3rd',
            'hgdemandimport']
if sys.version_info[0] == 2:
    packages.extend(['mercurial.thirdparty.concurrent',
                     'mercurial.thirdparty.concurrent.futures'])

common_depends = ['mercurial/bitmanipulation.h',
                  'mercurial/compat.h',
                  'mercurial/cext/util.h']
common_include_dirs = ['mercurial']

osutil_cflags = []
osutil_ldflags = []

# platform specific macros
for plat, func in [('bsd', 'setproctitle')]:
    if re.search(plat, sys.platform) and hasfunction(new_compiler(), func):
        osutil_cflags.append('-DHAVE_%s' % func.upper())

for plat, macro, code in [
    ('bsd|darwin', 'BSD_STATFS', '''
     #include <sys/param.h>
     #include <sys/mount.h>
     int main() { struct statfs s; return sizeof(s.f_fstypename); }
     '''),
    ('linux', 'LINUX_STATFS', '''
     #include <linux/magic.h>
     #include <sys/vfs.h>
     int main() { struct statfs s; return sizeof(s.f_type); }
     '''),
]:
    if re.search(plat, sys.platform) and cancompile(new_compiler(), code):
        osutil_cflags.append('-DHAVE_%s' % macro)

if sys.platform == 'darwin':
    osutil_ldflags += ['-framework', 'ApplicationServices']

xdiff_srcs = [
    'mercurial/thirdparty/xdiff/xdiffi.c',
    'mercurial/thirdparty/xdiff/xprepare.c',
    'mercurial/thirdparty/xdiff/xutils.c',
]

xdiff_headers = [
    'mercurial/thirdparty/xdiff/xdiff.h',
    'mercurial/thirdparty/xdiff/xdiffi.h',
    'mercurial/thirdparty/xdiff/xinclude.h',
    'mercurial/thirdparty/xdiff/xmacros.h',
    'mercurial/thirdparty/xdiff/xprepare.h',
    'mercurial/thirdparty/xdiff/xtypes.h',
    'mercurial/thirdparty/xdiff/xutils.h',
]

class RustExtension(Extension):
    """A C Extension, conditionnally enhanced with Rust code.

    if iswithrustextensions is False, does nothing else than plain Extension
    """

    rusttargetdir = os.path.join('rust', 'target', 'release')

    def __init__(self, mpath, sources, rustlibname, subcrate, **kw):
        Extension.__init__(self, mpath, sources, **kw)
        if not iswithrustextensions:
            return
        srcdir = self.rustsrcdir = os.path.join('rust', subcrate)
        self.libraries.append(rustlibname)
        self.extra_compile_args.append('-DWITH_RUST')

        # adding Rust source and control files to depends so that the extension
        # gets rebuilt if they've changed
        self.depends.append(os.path.join(srcdir, 'Cargo.toml'))
        cargo_lock = os.path.join(srcdir, 'Cargo.lock')
        if os.path.exists(cargo_lock):
            self.depends.append(cargo_lock)
        for dirpath, subdir, fnames in os.walk(os.path.join(srcdir, 'src')):
            self.depends.extend(os.path.join(dirpath, fname)
                                for fname in fnames
                                if os.path.splitext(fname)[1] == '.rs')

    def rustbuild(self):
        if not iswithrustextensions:
            return
        env = os.environ.copy()
        if 'HGTEST_RESTOREENV' in env:
            # Mercurial tests change HOME to a temporary directory,
            # but, if installed with rustup, the Rust toolchain needs
            # HOME to be correct (otherwise the 'no default toolchain'
            # error message is issued and the build fails).
            # This happens currently with test-hghave.t, which does
            # invoke this build.

            # Unix only fix (os.path.expanduser not really reliable if
            # HOME is shadowed like this)
            import pwd
            env['HOME'] = pwd.getpwuid(os.getuid()).pw_dir

        subprocess.check_call(['cargo', 'build', '-vv', '--release'],
                              env=env, cwd=self.rustsrcdir)
        self.library_dirs.append(self.rusttargetdir)

extmodules = [
    Extension('mercurial.cext.base85', ['mercurial/cext/base85.c'],
              include_dirs=common_include_dirs,
              depends=common_depends),
    Extension('mercurial.cext.bdiff', ['mercurial/bdiff.c',
                                       'mercurial/cext/bdiff.c'] + xdiff_srcs,
              include_dirs=common_include_dirs,
              depends=common_depends + ['mercurial/bdiff.h'] + xdiff_headers),
    Extension('mercurial.cext.mpatch', ['mercurial/mpatch.c',
                                        'mercurial/cext/mpatch.c'],
              include_dirs=common_include_dirs,
              depends=common_depends),
    RustExtension('mercurial.cext.parsers', ['mercurial/cext/charencode.c',
                                             'mercurial/cext/dirs.c',
                                             'mercurial/cext/manifest.c',
                                             'mercurial/cext/parsers.c',
                                             'mercurial/cext/pathencode.c',
                                             'mercurial/cext/revlog.c'],
                  'hgdirectffi',
                  'hg-direct-ffi',
                  include_dirs=common_include_dirs,
                  depends=common_depends + ['mercurial/cext/charencode.h',
                                            'mercurial/cext/revlog.h',
                                            'rust/hg-core/src/ancestors.rs',
                                            'rust/hg-core/src/lib.rs']),
    Extension('mercurial.cext.osutil', ['mercurial/cext/osutil.c'],
              include_dirs=common_include_dirs,
              extra_compile_args=osutil_cflags,
              extra_link_args=osutil_ldflags,
              depends=common_depends),
    Extension(
        'mercurial.thirdparty.zope.interface._zope_interface_coptimizations', [
        'mercurial/thirdparty/zope/interface/_zope_interface_coptimizations.c',
        ]),
    Extension('hgext.fsmonitor.pywatchman.bser',
              ['hgext/fsmonitor/pywatchman/bser.c']),
    ]

sys.path.insert(0, 'contrib/python-zstandard')
import setup_zstd
extmodules.append(setup_zstd.get_c_extension(
    name='mercurial.zstd',
    root=os.path.abspath(os.path.dirname(__file__))))

try:
    from distutils import cygwinccompiler

    # the -mno-cygwin option has been deprecated for years
    mingw32compilerclass = cygwinccompiler.Mingw32CCompiler

    class HackedMingw32CCompiler(cygwinccompiler.Mingw32CCompiler):
        def __init__(self, *args, **kwargs):
            mingw32compilerclass.__init__(self, *args, **kwargs)
            for i in 'compiler compiler_so linker_exe linker_so'.split():
                try:
                    getattr(self, i).remove('-mno-cygwin')
                except ValueError:
                    pass

    cygwinccompiler.Mingw32CCompiler = HackedMingw32CCompiler
except ImportError:
    # the cygwinccompiler package is not available on some Python
    # distributions like the ones from the optware project for Synology
    # DiskStation boxes
    class HackedMingw32CCompiler(object):
        pass

if os.name == 'nt':
    # Allow compiler/linker flags to be added to Visual Studio builds.  Passing
    # extra_link_args to distutils.extensions.Extension() doesn't have any
    # effect.
    from distutils import msvccompiler

    msvccompilerclass = msvccompiler.MSVCCompiler

    class HackedMSVCCompiler(msvccompiler.MSVCCompiler):
        def initialize(self):
            msvccompilerclass.initialize(self)
            # "warning LNK4197: export 'func' specified multiple times"
            self.ldflags_shared.append('/ignore:4197')
            self.ldflags_shared_debug.append('/ignore:4197')

    msvccompiler.MSVCCompiler = HackedMSVCCompiler

packagedata = {'mercurial': ['locale/*/LC_MESSAGES/hg.mo',
                             'help/*.txt',
                             'help/internals/*.txt',
                             'default.d/*.rc',
                             'dummycert.pem']}

def ordinarypath(p):
    return p and p[0] != '.' and p[-1] != '~'

for root in ('templates',):
    for curdir, dirs, files in os.walk(os.path.join('mercurial', root)):
        curdir = curdir.split(os.sep, 1)[1]
        dirs[:] = filter(ordinarypath, dirs)
        for f in filter(ordinarypath, files):
            f = os.path.join(curdir, f)
            packagedata['mercurial'].append(f)

datafiles = []

# distutils expects version to be str/unicode. Converting it to
# unicode on Python 2 still works because it won't contain any
# non-ascii bytes and will be implicitly converted back to bytes
# when operated on.
assert isinstance(version, bytes)
setupversion = version.decode('ascii')

extra = {}

if issetuptools:
    extra['python_requires'] = supportedpy
if py2exeloaded:
    extra['console'] = [
        {'script':'hg',
         'copyright':'Copyright (C) 2005-2018 Matt Mackall and others',
         'product_version':version}]
    # sub command of 'build' because 'py2exe' does not handle sub_commands
    build.sub_commands.insert(0, ('build_hgextindex', None))
    # put dlls in sub directory so that they won't pollute PATH
    extra['zipfile'] = 'lib/library.zip'

if os.name == 'nt':
    # Windows binary file versions for exe/dll files must have the
    # form W.X.Y.Z, where W,X,Y,Z are numbers in the range 0..65535
    setupversion = setupversion.split(r'+', 1)[0]

if sys.platform == 'darwin' and os.path.exists('/usr/bin/xcodebuild'):
    version = runcmd(['/usr/bin/xcodebuild', '-version'], {})[1].splitlines()
    if version:
        version = version[0]
        if sys.version_info[0] == 3:
            version = version.decode('utf-8')
        xcode4 = (version.startswith('Xcode') and
                  StrictVersion(version.split()[1]) >= StrictVersion('4.0'))
        xcode51 = re.match(r'^Xcode\s+5\.1', version) is not None
    else:
        # xcodebuild returns empty on OS X Lion with XCode 4.3 not
        # installed, but instead with only command-line tools. Assume
        # that only happens on >= Lion, thus no PPC support.
        xcode4 = True
        xcode51 = False

    # XCode 4.0 dropped support for ppc architecture, which is hardcoded in
    # distutils.sysconfig
    if xcode4:
        os.environ['ARCHFLAGS'] = ''

    # XCode 5.1 changes clang such that it now fails to compile if the
    # -mno-fused-madd flag is passed, but the version of Python shipped with
    # OS X 10.9 Mavericks includes this flag. This causes problems in all
    # C extension modules, and a bug has been filed upstream at
    # http://bugs.python.org/issue21244. We also need to patch this here
    # so Mercurial can continue to compile in the meantime.
    if xcode51:
        cflags = get_config_var('CFLAGS')
        if cflags and re.search(r'-mno-fused-madd\b', cflags) is not None:
            os.environ['CFLAGS'] = (
                os.environ.get('CFLAGS', '') + ' -Qunused-arguments')

setup(name='mercurial',
      version=setupversion,
      author='Matt Mackall and many others',
      author_email='[e-mail]',
      url='https://mercurial-scm.org/',
      download_url='https://mercurial-scm.org/release/',
      description=('Fast scalable distributed SCM (revision control, version '
                   'control) system'),
      long_description=('Mercurial is a distributed SCM tool written in Python.'
                        ' It is used by a number of large projects that require'
                        ' fast, reliable distributed revision control, such as '
                        'Mozilla.'),
      license='GNU GPLv2 or any later version',
      classifiers=[
          'Development Status :: 6 - Mature',
          'Environment :: Console',
          'Intended Audience :: Developers',
          'Intended Audience :: System Administrators',
          'License :: OSI Approved :: GNU General Public License (GPL)',
          'Natural Language :: Danish',
          'Natural Language :: English',
          'Natural Language :: German',
          'Natural Language :: Italian',
          'Natural Language :: Japanese',
          'Natural Language :: Portuguese (Brazilian)',
          'Operating System :: Microsoft :: Windows',
          'Operating System :: OS Independent',
          'Operating System :: POSIX',
          'Programming Language :: C',
          'Programming Language :: Python',
          'Topic :: Software Development :: Version Control',
      ],
      scripts=scripts,
      packages=packages,
      ext_modules=extmodules,
      data_files=datafiles,
      package_data=packagedata,
      cmdclass=cmdclass,
      distclass=hgdist,
      options={
          'py2exe': {
              'packages': [
                  'hgdemandimport',
                  'hgext',
                  'email',
                  # implicitly imported per module policy
                  # (cffi wouldn't be used as a frozen exe)
                  'mercurial.cext',
                  #'mercurial.cffi',
                  'mercurial.pure',
              ],
          },
          'bdist_mpkg': {
              'zipdist': False,
              'license': 'COPYING',
              'readme': 'contrib/packaging/macosx/Readme.html',
              'welcome': 'contrib/packaging/macosx/Welcome.html',
          },
      },
      **extra)