Validate that LICENSE files are included in build wheels

.github/workflows/cibuildwheel.yml

@@ -67,6 +67,10 @@ jobs:
           startsWith(github.ref, 'refs/heads/v3.3') ||
           startsWith(github.ref, 'refs/tags/v3.3') )
 
+      - name: Validate that LICENSE files are included in wheels
+        run: |
+          python ./ci/check_wheel_licenses.py
+
       - uses: actions/upload-artifact@v2
         with:
           name: wheels

ci/check_wheel_licenses.py

@@ -0,0 +1,32 @@
+#!/usr/bin/env python3
+
+"""Check that all .whl files in the dist folder have the correct LICENSE files included.
+
+To run:
+    $ python3 setup.py bdist_wheel
+    $ ./ci/check_wheel_licenses.py
+"""
+
+from pathlib import Path
+import sys
+import zipfile
+
+EXIT_SUCCESS = 0
+EXIT_FAILURE = 1
+
+project_dir = Path(__file__).parent.resolve().parent
+dist_dir = project_dir / 'dist'
+license_dir = project_dir / 'LICENSE'
+
+license_file_names = [Path(path).name for path in sorted(license_dir.glob('*'))]
+for wheel in dist_dir.glob('*.whl'):
+    print(f'Checking LICENSE files in: {wheel}')
+    with zipfile.ZipFile(wheel) as f:
+        wheel_license_file_names = [Path(path).name for path in sorted(f.namelist())
+                                    if '.dist-info/LICENSE' in path]
+        if wheel_license_file_names != license_file_names:
+            print(f'LICENSE file(s) missing:\n'
+                  f'{wheel_license_file_names} !=\n'
+                  f'{license_file_names}')
+            sys.exit(EXIT_FAILURE)
+sys.exit(EXIT_SUCCESS)