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

1 files changed, 27 insertions, 0 deletions

diff --git a/setuptools/bootstrap.py b/setuptools/bootstrap.py
new file mode 100644
index 00000000..0cd95778
--- /dev/null
+++ b/setuptools/bootstrap.py
@@ -0,0 +1,27 @@
+"""
+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)