fix(python2): do not rewrite sys.path entries for PYTHONPATH

Fixes #1670

src/virtualenv/create/via_global_ref/builtin/python2/site.py

@@ -28,6 +28,7 @@ def main():
  prefix, exec_prefix = abs_path(sys.prefix), abs_path(sys.exec_prefix)
  global_site_package_enabled = config.get("include-system-site-packages", False) == "true"
  rewrite_standard_library_sys_path()
+ revert_pythonpath_rewrite()
  disable_user_site_package()
  load_host_site()
  if global_site_package_enabled:
@@ -130,6 +131,22 @@ def rewrite_standard_library_sys_path():
  sys.path[at] = translate_directory(value)
 
 
+def revert_pythonpath_rewrite():
+ # Now that we can access os.environ["PYTHONPATH"], we can revert our
+ # rewrite of thoses paths done in `rewrite_standard_library_sys_path`.
+ import os
+
+ python_paths = os.environ.get("PYTHONPATH", "").split(":")
+ for ppath in python_paths:
+ translated_ppath = translate_directory(ppath)
+ try:
+ at = sys.path.index(translated_ppath)
+ except ValueError:
+ pass
+ else:
+ sys.path[at] = ppath
+
+
 def disable_user_site_package():
  """Flip the switch on enable user site package"""
  # sys.flags is a c-extension type, so we cannot monkeypatch it, replace it with a python class to flip it