Fix IPython.utils.sysinfo for Python 3.

IPython/utils/sysinfo.py

@@ -70,9 +70,13 b' def pkg_commit_hash(pkg_path):'
         raise IOError('Missing commit info file %s' % pth)
     cfg_parser = ConfigParser()
     cfg_parser.read(pth)
-    archive_subst = cfg_parser.get('commit hash', 'archive_subst_hash')
-    if not archive_subst.startswith('$Format'): # it has been substituted
-        return 'archive substitution', archive_subst
+    try:
+        archive_subst = cfg_parser.get('commit hash', 'archive_subst_hash')
+    except Exception:
+        pass
+    else:
+        if not archive_subst.startswith('$Format'): # it has been substituted
+            return 'archive substitution', archive_subst
     install_subst = cfg_parser.get('commit hash', 'install_hash')
     if install_subst != '':
         return 'installation', install_subst

setup3.py

@@ -1,15 +1,18 b''
 import os.path
 from setuptools import setup
+from setuptools.command.build_py import build_py
 
 from setupbase import (setup_args,
                        find_scripts,
                        find_packages,
                        find_package_data,
+                       record_commit_info,
                        )
     
 setup_args['entry_points'] = find_scripts(True, suffix='3')
 setup_args['packages'] = find_packages()
 setup_args['package_data'] = find_package_data()
+setup_args['cmdclass'] = {'build_py': record_commit_info('IPython', build_cmd=build_py)}
 
 def main():
     setup(use_2to3 = True, **setup_args)

setupbase.py

@@ -359,7 +359,7 b' def record_commit_info(pkg_dir, build_cmd=build_py):'
     class MyBuildPy(build_cmd):
         ''' Subclass to write commit data into installation tree '''
         def run(self):
-            build_py.run(self)
+            build_cmd.run(self)
             import subprocess
             proc = subprocess.Popen('git rev-parse --short HEAD',
                                     stdout=subprocess.PIPE,
@@ -369,7 +369,7 b' def record_commit_info(pkg_dir, build_cmd=build_py):'
             # We write the installation commit even if it's empty
             cfg_parser = ConfigParser()
             cfg_parser.read(pjoin(pkg_dir, '.git_commit_info.ini'))
-            cfg_parser.set('commit hash', 'install_hash', repo_commit)
+            cfg_parser.set('commit hash', 'install_hash', repo_commit.decode('ascii'))
             out_pth = pjoin(self.build_lib, pkg_dir, '.git_commit_info.ini')
             out_file = open(out_pth, 'wt')
             cfg_parser.write(out_file)