Stop trying to write into the stdlib during packaging tests (#12331).
This prevents tests from failing when run from a Python installed in a
read-only directory. The code is a bit uglier; shutil.copytree calls
copystat on directories behind our back, so I had to add an os.walk
with os.chmod (*and* os.path.join!) calls. shutil, I am disappoint.
This changeset is dedicated to the hundreds of neurons that were lost
while I was debugging this on an otherwise fine afternoon.
diff --git a/Misc/NEWS b/Misc/NEWS
index 3f5aa29..afe4894 100644
--- a/Misc/NEWS
+++ b/Misc/NEWS
@@ -1147,6 +1147,9 @@
Tests
-----
+- Issue #12331: The test suite for the packaging module can now run from an
+ installed Python.
+
- Issue #12331: The test suite for lib2to3 can now run from an installed
Python.