Regression: sdists no longer install package data correctly with 35.0.0

[PiDelport]

Problem description

I have a package that uses setuptools_scm and include_package_data=True to include some Django templates and static files.

With setuptools 34.4.1, installing an sdist will install these package data files without any problems. However, with setuptools 35.0.0, installing the same sdist file will no longer install these package data files.

Note:

• Only installing sdists seem to be affected by this problem. In particular:
  • Generating sdists seems unaffected: both setuptools 34 and 35 generate sdists with the same (correct) distribution content and SOURCES.txt.
  • Installing sdists previously generated with either setuptools version works correctly with 34.4.1, and fails with 35.0.0.
• Wheels seem to be unaffected by this, and build and install fine with both setuptools 34 and 35.

Cause?

As far as I can tell, this regression is due to #436 / #1014, which no longer reads the sdist package's existing manifest. When the manifest gets regenerated (?), the files that were previously included by setuptools_scm while building the sdist are no longer included anymore.

[PiDelport]

Here's a reproducing test script using cartridge-downloads, which uses setuptools_scm and include_package_data=True to include some templates:

PACKAGE=cartridge-downloads  # Change this to test other packages

pip install 'setuptools==34.4.1'
pip install --no-binary "$PACKAGE" "$PACKAGE"
pip show -f "$PACKAGE" >good-info

pip uninstall "$PACKAGE"

pip install 'setuptools==35.0.0'
pip install --no-binary "$PACKAGE" "$PACKAGE"
pip show -f "$PACKAGE" >bad-info

diff -u good-info bad-info

(Note that this uses pip install --no-binary to install the sdist rather than the wheel.)

Diff output:

--- good-info	2017-04-18 16:25:18.364959212 +0200
+++ bad-info	2017-04-18 16:25:32.172929357 +0200
@@ -37,12 +37,6 @@
   cartridge_downloads/models.py
   cartridge_downloads/page_processors.py
   cartridge_downloads/signals.py
-  cartridge_downloads/templates/email/form_response.html
-  cartridge_downloads/templates/email/form_response.txt
-  cartridge_downloads/templates/email/order_receipt.html
-  cartridge_downloads/templates/email/order_receipt.txt
-  cartridge_downloads/templates/shop/complete.html
-  cartridge_downloads/templates/shop/downloads/index.html
   cartridge_downloads/templatetags/__init__.py
   cartridge_downloads/templatetags/__pycache__/__init__.cpython-35.pyc
   cartridge_downloads/templatetags/__pycache__/downloads.cpython-35.pyc

As you can see, setuptools 35.0.0 no longer installs the templates directory as package data.

[PiDelport]

pyuri is another example of an affected package:

+ diff -u good-info bad-info
--- good-info	2017-04-18 16:36:47.098278222 +0200
+++ bad-info	2017-04-18 16:36:53.994243434 +0200
@@ -19,5 +19,4 @@
   pyuri/__pycache__/uri.cpython-35.pyc
   pyuri/__pycache__/validators.cpython-35.pyc
   pyuri/uri.py
-  pyuri/uri.regex
   pyuri/validators.py

[miccoli]

I'm convinced that my PR #1014 is the culprit, see my comments to #436 .

[jaraco]

Well, now we know. The quick fix is to revert the change. The better fix would be to also write a test to capture this expectation.

[PiDelport]

Okay, I created an integration test case using pyuri that seems to reliably test for this:

• Branch: https://github.com/pjdelport/setuptools/tree/issue-1016-install-sdist-package-data
• Diff: master...pjdelport:issue-1016-install-sdist-package-data

This test case passes on 34, and fails on 35.

If it looks good, I can PR that as a starting point for fixing this issue?

[miccoli]

I think that at this point it is better to revert #1014 starting from @pjdelport test case, reopening #436 . Sorry for the regression: when testing #1014 I've completely overlooked the implications beyond sdist creation.

[jaraco]

I can PR that as a starting point.

I went ahead and pulled in the commit. Thanks for putting it together and presenting it in such an accessible way.

[PiDelport]

Thanks @jaraco!