Merge pull request matplotlib#18376 from meeseeksmachine/auto-backport-of-pr-18298-on-v3.3.x

Backport PR matplotlib#18298 on branch v3.3.x (Include license files in built distribution)

Author: dopplershift

.github/workflows/cibuildwheel.yml

@@ -30,6 +30,10 @@ jobs:
         run: |
           python -m pip install cibuildwheel==1.5.5
 
+      - name: Copy setup.cfg to configure wheel
+        run: |
+          cp setup.cfg.template setup.cfg
+
       - name: Build wheels for CPython
         run: |
           python -m cibuildwheel --output-dir dist
@@ -65,6 +69,10 @@ 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

LICENSE/LICENSE_CARLOGO.txt renamed to LICENSE/LICENSE_CARLOGO

@@ -0,0 +1,36 @@
+#!/usr/bin/env python3
+
+"""
+Check that all .whl files in the dist folder have the correct LICENSE files
+included.
+
+To run:
+    $ cp setup.cfg.template setup.cfg
+    $ 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.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)

LICENSE/Solarized.txt renamed to LICENSE/LICENSE_SOLARIZED

@@ -1,5 +1,8 @@
 # Rename this file to setup.cfg to modify Matplotlib's build options.
 
+[metadata]
+license_files = LICENSE/*
+
 [egg_info]
 
 [libs]