Fix py27-cxfreeze tox environment

Use a custom script to install a patched version of cx_freeze,
as required in Ubuntu 14.04 systems

--HG--
branch : cx_freeze_ubuntu

.hgignore

@@ -25,6 +25,8 @@ syntax:glob
 doc/*/_build
 build/
 dist/
+testing/cx_freeze/build
+testing/cx_freeze/cx_freeze_source
 *.egg-info
 issue/
 env/

testing/cx_freeze/install_cx_freeze.py

@@ -0,0 +1,66 @@
+"""
+Installs cx_freeze from source, but first patching
+setup.py as described here:
+
+http://stackoverflow.com/questions/25107697/compiling-cx-freeze-under-ubuntu
+"""
+import glob
+import shutil
+import tarfile
+import os
+import sys
+import platform
+
+if __name__ == '__main__':
+    if 'ubuntu' not in platform.version().lower():
+
+        print('Not Ubuntu, installing using pip. (platform.version() is %r)' %
+              platform.version())
+        res = os.system('pip install cx_freeze')
+        if res != 0:
+            sys.exit(res)
+        sys.exit(0)
+
+    if os.path.isdir('cx_freeze_source'):
+        shutil.rmtree('cx_freeze_source')
+    os.mkdir('cx_freeze_source')
+
+    res = os.system('pip install --download cx_freeze_source --no-use-wheel '
+                    'cx_freeze')
+    if res != 0:
+        sys.exit(res)
+
+    packages = glob.glob('cx_freeze_source/*.tar.gz')
+    assert len(packages) == 1
+    tar_filename = packages[0]
+
+    tar_file = tarfile.open(tar_filename)
+    try:
+        tar_file.extractall(path='cx_freeze_source')
+    finally:
+        tar_file.close()
+
+    basename = os.path.basename(tar_filename).replace('.tar.gz', '')
+    setup_py_filename = 'cx_freeze_source/%s/setup.py' % basename
+    with open(setup_py_filename) as f:
+        lines = f.readlines()
+
+    line_to_patch = 'if not vars.get("Py_ENABLE_SHARED", 0):'
+    for index, line in enumerate(lines):
+        if line_to_patch in line:
+            indent = line[:line.index(line_to_patch)]
+            lines[index] = indent + 'if True:\n'
+            print('Patched line %d' % (index + 1))
+            break
+    else:
+        sys.exit('Could not find line in setup.py to patch!')
+
+    with open(setup_py_filename, 'w') as f:
+        f.writelines(lines)
+
+    os.chdir('cx_freeze_source/%s' % basename)
+    res = os.system('python setup.py install')
+    if res != 0:
+        sys.exit(res)
+
+    sys.exit(0)

tox.ini

@@ -125,10 +125,10 @@ commands=
         -rfsxX --junitxml={envlogdir}/junit-{envname}2.xml []
 
 [testenv:py27-cxfreeze]
-deps=cx_freeze
 changedir=testing/cx_freeze
 basepython=python2.7
 commands=
+    {envpython} install_cx_freeze.py
     {envpython} runtests_setup.py build --build-exe build
     {envpython} tox_run.py