fix race in localrepo.addchangegroup.
localrepo.addchangegroup writes to changelog, then manifest, then normal
files. this breaks access ordering. if reader reads changelog while
manifest is being written, can find pointers into places in manifest
that are not yet written. same can happen for manifest and normal files.
fix is to make almost no change to localrepo.addchangegroup. it must
to write changelog and manifest data early because it has to read them
while writing other files. instead, write changelog and manifest data
to temp file that reader cannot see, then append temp data to manifest
after all normal files written, finally append temp data to changelog.
temp file code is in new appendfile module. can be used in other places
with small changes.
much smaller race still left. we write all new data in one write call,
but reader can maybe see partial update because python or os or filesystem
cannot always make write really atomic. file locking no help: slow, not
portable, not reliable over nfs. only real safe other plan is write to
temp file every time and rename, but performance bad when manifest or
changelog is big.
#!/usr/bin/env python
#
# This is the mercurial setup script.
#
# './setup.py install', or
# './setup.py --help' for more options
import sys
if not hasattr(sys, 'version_info') or sys.version_info < (2, 3):
raise SystemExit, "Mercurial requires python 2.3 or later."
import glob
from distutils.core import setup, Extension
from distutils.command.install_data import install_data
import mercurial.version
# py2exe needs to be installed to work
try:
import py2exe
# Help py2exe to find win32com.shell
try:
import modulefinder
import win32com
for p in win32com.__path__[1:]: # Take the path to win32comext
modulefinder.AddPackagePath("win32com", p)
pn = "win32com.shell"
__import__(pn)
m = sys.modules[pn]
for p in m.__path__[1:]:
modulefinder.AddPackagePath(pn, p)
except ImportError:
pass
# Due to the use of demandload py2exe is not finding the modules.
# packagescan.getmodules creates a list of modules included in
# the mercurial package plus depdent modules.
import mercurial.packagescan
from py2exe.build_exe import py2exe as build_exe
class py2exe_for_demandload(build_exe):
""" overwrites the py2exe command class for getting the build
directory and for setting the 'includes' option."""
def initialize_options(self):
self.build_lib = None
build_exe.initialize_options(self)
def finalize_options(self):
# Get the build directory, ie. where to search for modules.
self.set_undefined_options('build',
('build_lib', 'build_lib'))
# Sets the 'includes' option with the list of needed modules
if not self.includes:
self.includes = []
else:
self.includes = self.includes.split(',')
self.includes += mercurial.packagescan.getmodules(self.build_lib,
'mercurial')
self.includes += mercurial.packagescan.getmodules(self.build_lib,
'hgext')
build_exe.finalize_options(self)
except ImportError:
py2exe_for_demandload = None
# specify version string, otherwise 'hg identify' will be used:
version = ''
class install_package_data(install_data):
def finalize_options(self):
self.set_undefined_options('install',
('install_lib', 'install_dir'))
install_data.finalize_options(self)
mercurial.version.remember_version(version)
cmdclass = {'install_data': install_package_data}
py2exe_opts = {}
if py2exe_for_demandload is not None:
cmdclass['py2exe'] = py2exe_for_demandload
py2exe_opts['console'] = ['hg']
setup(name='mercurial',
version=mercurial.version.get_version(),
author='Matt Mackall',
author_email='mpm@selenic.com',
url='http://selenic.com/mercurial',
description='Scalable distributed SCM',
license='GNU GPL',
packages=['mercurial', 'hgext'],
ext_modules=[Extension('mercurial.mpatch', ['mercurial/mpatch.c']),
Extension('mercurial.bdiff', ['mercurial/bdiff.c'])],
data_files=[('mercurial/templates',
['templates/map'] +
glob.glob('templates/map-*') +
glob.glob('templates/*.tmpl')),
('mercurial/templates/static',
glob.glob('templates/static/*'))],
cmdclass=cmdclass,
scripts=['hg', 'hgmerge'],
options=dict(bdist_mpkg=dict(zipdist=True,
license='COPYING',
readme='contrib/macosx/Readme.html',
welcome='contrib/macosx/Welcome.html')),
**py2exe_opts)