[Python-modules-commits] [python-pex] 08/10: Work around Debian's devendorizing of pkg_resource dependencies.

[Barry Warsaw]

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barry pushed a commit to branch master
in repository python-pex.

commit 1c903a85e39cd3fa74bd4159e72c1dbee2024cdd
Author: Barry Warsaw <barry at debian.org>
Date:   Thu Aug 13 18:21:53 2015 -0400

    Work around Debian's devendorizing of pkg_resource dependencies.
    
    Forwarded: not-needed
    Patch-Name: handle-pkg_resources-devendorization.patch
---
 pex/pex_bootstrapper.py | 14 ++++++++++++++
 1 file changed, 14 insertions(+)

diff --git a/pex/pex_bootstrapper.py b/pex/pex_bootstrapper.py
index 137757f..f2aaa45 100644
--- a/pex/pex_bootstrapper.py
+++ b/pex/pex_bootstrapper.py
@@ -94,6 +94,20 @@ def bootstrap_pex(entry_point):
   register_finders()
   maybe_reexec_pex()
 
+  # 2015-03-24 BAW (Debian/Ubuntu): This will make grown Pythonistas weep.  In
+  # Debian, we devendorize pkg_resources by removing all its bundled
+  # dependencies and making it use the system versions.  This plays havoc with
+  # pex though, because pex messes with sys.path and sys.modules and ends up
+  # double importing sub-modules from pkg_resources.  This confuses Python
+  # deeply, resulting in AttributeError tracebacks when pkg_resources itself
+  # tries to dig sub-modules out of its own namespace.  Yes, AttributeErrors,
+  # not ImportErrors.  By pure trial and error, this seems to work around the
+  # problem.
+  import sys
+  for modname in list(sys.modules):
+    if modname.startswith('pkg_resources.'):
+      del sys.modules[modname]
+
   from . import pex
   pex.PEX(entry_point).execute()
 

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