Python 3 - fix cffi resolver issues

3rdparty/python/requirements.txt

@@ -27,7 +27,7 @@ pywatchman==1.4.1
 requests[security]>=2.5.0,<2.19
 scandir==1.2
 setproctitle==1.1.10
-setuptools==30.0.0
+setuptools==33.1.1
 six>=1.9.0,<2
 subprocess32==3.2.7 ; python_version<'3'
 thrift>=0.9.1

src/python/pants/backend/python/subsystems/python_setup.py

@@ -33,7 +33,7 @@ def register_options(cls, register):
                   "or 'PyPy' (A pypy interpreter of any version). Multiple constraint strings will "
                   "be ORed together. These constraints are applied in addition to any "
                   "compatibilities required by the relevant targets.")
-    register('--setuptools-version', advanced=True, default='30.0.0',
+    register('--setuptools-version', advanced=True, default='33.1.1',
              help='The setuptools version for this python environment.')
     register('--wheel-version', advanced=True, default='0.29.0',
              help='The wheel version for this python environment.')

src/python/pants/core_tasks/clean.py

@@ -41,7 +41,7 @@ def execute(self):
       safe_concurrent_rename(pants_wd, tmp_trash)
       safe_concurrent_rename(tmpdir, pants_wd)
 
-      if self.get_options().async:
+      if self.get_options()['async']:
         # The trash directory is deleted in a child process.
         pid = os.fork()
         if pid == 0:

src/python/pants/invalidation/cache_manager.py

@@ -6,10 +6,11 @@
 
 import os
 import shutil
-import sys
 from builtins import object
 from hashlib import sha1
 
+from future.utils import raise_from
+
 from pants.build_graph.build_graph import sort_targets
 from pants.build_graph.target import Target
 from pants.invalidation.build_invalidator import CacheKey
@@ -389,8 +390,6 @@ def _key_for(self, target):
     except Exception as e:
       # This is a catch-all for problems we haven't caught up with and given a better diagnostic.
       # TODO(Eric Ayers): If you see this exception, add a fix to catch the problem earlier.
-      exc_info = sys.exc_info()
       new_exception = self.CacheValidationError("Problem validating target {} in {}: {}"
                                                 .format(target.id, target.address.spec_path, e))
-
-      raise self.CacheValidationError, new_exception, exc_info[2]
+      raise_from(self.CacheValidationError(new_exception), e)