Add safeguard against improper installs when using a clean repository checkout. Fixes #659.

1 files changed, 5 insertions, 0 deletions

diff --git a/setup.py b/setup.py
index 1d742add..69c55417 100755
--- a/setup.py
+++ b/setup.py
@@ -11,6 +11,11 @@ import textwrap
 # Allow to run setup.py from another directory.
 os.chdir(os.path.dirname(os.path.abspath(__file__)))
 
+# Prevent improper installs without necessary metadata. See #659
+if not os.path.exists('setuptools.egg-info'):
+    msg = "Cannot build setuptools without metadata. Run bootstrap.py"
+    raise RuntimeError(msg)
+
 src_root = None
 
 from distutils.util import convert_path