From 53e1294825c3889235af2ca6ac9dbc9d6cb74a7a Mon Sep 17 00:00:00 2001
From: Eelco Dolstra <edolstra@gmail.com>
Date: Tue, 31 Mar 2020 13:33:11 +0200
Subject: [PATCH] Fix Mercurial tests

In Nixpkgs 20.03, Mercurial fails if PYTHONPATH is set:

  $ hg
  Traceback (most recent call last):
    File "/nix/store/q7s856v6nw4dffdrm9k3w38qs35i8kr3-mercurial-5.2.2/bin/..hg-wrapped-wrapped", line 37, in <module>
      dispatch.run()
    File "/nix/store/bffdy7q3wi3qinflnvbdkigqj39zzynd-python3-3.7.6/lib/python3.7/importlib/util.py", line 245, in __getattribute__
      self.__spec__.loader.exec_module(self)
    File "<frozen importlib._bootstrap_external>", line 728, in exec_module
    File "<frozen importlib._bootstrap>", line 219, in _call_with_frames_removed
    File "/nix/store/q7s856v6nw4dffdrm9k3w38qs35i8kr3-mercurial-5.2.2/lib/python3.7/site-packages/mercurial/dispatch.py", line 10, in <module>
      import difflib
    File "/nix/store/bffdy7q3wi3qinflnvbdkigqj39zzynd-python3-3.7.6/lib/python3.7/difflib.py", line 1084, in <module>
      import re
    File "/nix/store/bffdy7q3wi3qinflnvbdkigqj39zzynd-python3-3.7.6/lib/python3.7/re.py", line 143, in <module>
      class RegexFlag(enum.IntFlag):
  AttributeError: module 'enum' has no attribute 'IntFlag'

(cherry picked from commit 4009d4295e1e3c0e59e716b0b111f48c590a6020)
---
 tests/Makefile.am | 1 +
 1 file changed, 1 insertion(+)

diff --git a/tests/Makefile.am b/tests/Makefile.am
index e56e528e..d3153a55 100644
--- a/tests/Makefile.am
+++ b/tests/Makefile.am
@@ -14,6 +14,7 @@ TESTS_ENVIRONMENT = \
   NIX_BUILD_HOOK=					\
   PGHOST=/tmp	\
   PERL5LIB="$(srcdir):$(abs_top_srcdir)/src/lib:$$PERL5LIB"	\
+  PYTHONPATH= \
   PATH=$(abs_top_srcdir)/src/hydra-evaluator:$(abs_top_srcdir)/src/script:$(abs_top_srcdir)/src/hydra-eval-jobs:$(abs_top_srcdir)/src/hydra-queue-runner:$$PATH \
   perl -w