added workaround for corrupted lib directory

docs/index.rst

@@ -33,6 +33,7 @@ Contents:
    indexes
    inheritance
    versions
+   caveats
 
 
 Indices and tables

scripts/uranium

@@ -84,10 +84,35 @@ def _install_virtualenv(install_dir):
                          '--no-site-packages',
                          '--always-copy',
                          install_dir])
+        site_py_file = _get_site_file_path(install_dir)
+        _inject_to_site_py(site_py_file)
     finally:
         shutil.rmtree(temp_dir)
 
 
+def _get_site_file_path(venv_directory):
+    executable = os.path.join(venv_directory, 'bin', 'python')
+    return subprocess.check_output(
+        [executable, "-c", "import site; print(site.__file__)"]
+    # we strip the last character because it is a .pyc file.
+    # want the .py
+    )[:-2]
+
+
+def _inject_to_site_py(site_py_file):
+    """
+    we inject modifications to the site.py
+    """
+    with open(site_py_file, 'a') as fh:
+        fh.write("""
+# reshuffling the paths to ensure that distributions in the sandbox
+# always come first
+paths_to_append = [p for p in sys.path if p.startswith(sys.real_prefix)]
+sys.path = [p for p in sys.path if not p.startswith(sys.real_prefix)]
+sys.path += paths_to_append
+        """.strip())
+
+
 def _install_uranium(virtualenv_dir, uranium_dir=None, version=None):
     if uranium_dir:
         uranium_dir = os.path.expanduser(uranium_dir)

setup.py

@@ -21,7 +21,7 @@
 ]
 
 setup(name='uranium',
-      version='0.0.63',
+      version='0.0.64',
       description='a build system for python',
       long_description='a build system for python',
       author='Yusuke Tsutsumi',

uranium/__init__.py

@@ -22,7 +22,8 @@
 from virtualenv import make_environment_relocatable
 from .uranium import Uranium
 from .virtualenv_manager import (
-    install_virtualenv, inject_into_activate_this
+    install_virtualenv, inject_into_activate_this,
+    inject_sitepy
 )
 from .config import Config
 from .activate import generate_activate_this
@@ -43,7 +44,7 @@ def main(argv=sys.argv[1:]):
 
     with in_virtualenv(uranium_dir):
         uranium.run()
-    _inject_activate_this(uranium_dir, uranium)
+    _inject_uranium_into_venv(uranium_dir, uranium)
 
 
 def _get_uranium(uranium_file):
@@ -68,9 +69,10 @@ def in_virtualenv(path):
     make_environment_relocatable(path)
 
 
-def _inject_activate_this(uranium_dir, uranium):
+def _inject_uranium_into_venv(uranium_dir, uranium):
     content = generate_activate_this(uranium)
     inject_into_activate_this(uranium_dir, content)
+    inject_sitepy(uranium_dir)
 
 
 def _activate_virtualenv(uranium_dir):

uranium/virtualenv_manager.py

@@ -1,6 +1,7 @@
 import logging
-import re
 import os
+import re
+import subprocess
 from virtualenv import create_environment
 
 LOGGER = logging.getLogger(__name__)
@@ -38,6 +39,14 @@ def is_virtualenv(path):
 {0}
 """.format(INJECT_WRAPPER)
 
+SITE_PY_INJECTION = """
+# reshuffling the paths to ensure that distributions in the sandbox
+# always come first
+paths_to_append = [p for p in sys.path if p.startswith(sys.real_prefix)]
+sys.path = [p for p in sys.path if not p.startswith(sys.real_prefix)]
+sys.path += paths_to_append
+"""
+
 
 def inject_into_activate_this(venv_root, body):
     """
@@ -49,6 +58,20 @@ def inject_into_activate_this(venv_root, body):
     inject_into_file(activate_this_file, body)
 
 
+def inject_sitepy(venv_root):
+    site_py_file = _get_site_file_path(venv_root)
+    inject_into_file(site_py_file, SITE_PY_INJECTION)
+
+
+def _get_site_file_path(venv_directory):
+    executable = os.path.join(venv_directory, 'bin', 'python')
+    return subprocess.check_output(
+        [executable, "-c", "import site; print(site.__file__)"]
+    # we strip the last character because it is a .pyc file.
+    # want the .py
+    )[:-2]
+
+
 def inject_into_file(path, body):
     """ inject into a file """
     with open(path) as fh: