view setup.py @ 827:a61728b58dc0

Fix array overflow bug in bdiff

I ran into a bug while importing a large repository into mercurial.
The diff algorithm does not allocate a big enough array of hunks
for some test cases. This results in memory corruption, and possibly,
as in my case, a seg fault.

You should be able to reproduce this problem with any case of more
than a few lines that follows this pattern:

a  b
=  =
1  1
   2
2  3
   4
3  5
   .
4  .
   .
5
.
.
.

I.e., "a" has blank lines on every other line that have been removed in
"b". In this case, the number of matching hunks is equal to the number
of lines in "b". This is more than ((an + bn)/4 + 2). I'm not sure what
motivates this formula, but when I changed it to the smaller of an or
bn (+ 1), it works.

[comment added by mpm]

#!/usr/bin/env python
#
# This is the mercurial setup script.
#
# './setup.py install', or
# './setup.py --help' for more options

import glob
from distutils.core import setup, Extension
from distutils.command.install_data import install_data

import mercurial.version

# 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)

try:
    mercurial.version.remember_version(version)
    setup(name='mercurial',
          version=mercurial.version.get_version(),
          author='Matt Mackall',
          author_email='[e-mail]',
          url='http://selenic.com/mercurial',
          description='scalable distributed SCM',
          license='GNU GPL',
          packages=['mercurial'],
          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'))],
          cmdclass = { 'install_data' : install_package_data },
          scripts=['hg', 'hgmerge'])
finally:
    mercurial.version.forget_version()