Trying a new technique. In this approach, setuptools is aware of its...

Trying a new technique. In this approach, setuptools is aware of its dependencies and when imported makes sure the vendored versions are present on sys.path.

--HG--
branch : feature/issue-229

.travis.yml

@@ -8,7 +8,6 @@ python:
   - pypy
 # command to run tests
 script:
- - export PYTHONPATH=`pwd`/six-*.egg
  - python setup.py egg_info
  - python setup.py test
  - python setup.py ptr

setup.py

@@ -6,8 +6,6 @@ import sys
 import textwrap
 import contextlib
 
-sys.path.append('six-1.7.3.egg')
-
 # Allow to run setup.py from another directory.
 os.chdir(os.path.dirname(os.path.abspath(__file__)))
 

setuptools/__init__.py

 """Extensions to the 'distutils' for large or complex distributions"""
 
+__import__('setuptools.bootstrap').bootstrap.ensure_deps()
+
 import os
 import sys
 import distutils.core

setuptools/bootstrap.py

+"""
+When setuptools is installed in a clean environment, it doesn't have its
+dependencies, so it can't run to install its dependencies. This module
+checks those dependencies and if one or more are missing, it uses vendored
+versions.
+"""
+
+import os
+import sys
+import glob
+
+def ensure_deps():
+	"""
+	Detect if dependencies are installed and if not, use vendored versions.
+	"""
+	try:
+		__import__('six')
+	except ImportError:
+		use_vendor_deps()
+
+def use_vendor_deps():
+	"""
+	Use vendored versions
+	"""
+	here = os.path.dirname(__file__)
+	eggs = glob.glob(here + '/_vendor/*.egg')
+	sys.path.extend(eggs)