Added check for minimal python version to setup.py

setup.py

@@ -1,103 +1,106 b''
 #!/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
-import sys
 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)
 
 try:
     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='[e-mail]',
           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)
 finally:
     mercurial.version.forget_version()