add script to add license full text file to wheel dist-info

maturing has issues embedding license full text in the wheels so for now we do it ourselves.
PyO3/maturin#829

There's another problem using wheeltools on windows (it creates zip files with backslashes...) so I run this on Linux after all the wheels have been built.

.github/workflows/ci.yml

@@ -153,13 +153,24 @@ jobs:
     steps:
     - uses: actions/checkout@v2
       with:
-        fetch-depth: 0
+        submodules: recursive
+
+    - name: Set up Python
+      uses: actions/setup-python@v2
+      with:
+        python-version: "3.x"
 
     - uses: actions/download-artifact@v2
       with:
         name: dist
         path: dist
 
+    # https://github.com/PyO3/maturin/issues/829
+    - name: Add license text file to wheels
+      run: |
+        pip install wheeltools
+        python add_license_file_to_wheels.py dist/*.whl
+
     - name: Extract release notes from annotated tag message
       id: release_notes
       env:

add_license_file_to_wheels.py

@@ -0,0 +1,25 @@
+#!/usr/bin/env python3
+
+import sys
+from pathlib import Path
+import shutil
+from wheeltools import InWheel
+
+
+root_dir = Path(__file__).parent.resolve()
+crate_dir = root_dir / "pngquant"
+license = crate_dir / "COPYRIGHT"
+
+
+def main():
+    # maturin has problems adding the license text to the wheel archive yet so we
+    # have to do it ourselves: cf. https://github.com/PyO3/maturin/issues/829
+    for wheel_file in sys.argv[1:]:
+        with InWheel(in_wheel=wheel_file, out_wheel=wheel_file) as tmpdir:
+            distinfo = next(Path(tmpdir).glob("*.dist-info"))
+            assert distinfo.is_dir()
+            shutil.copyfile(license, distinfo / "LICENSE")
+
+
+if __name__ == "__main__":
+    sys.exit(main())

build.py

@@ -6,7 +6,6 @@
 import subprocess
 import sys
 from pathlib import Path
-from wheeltools import InWheel
 
 
 root_dir = Path(__file__).parent.resolve()
@@ -38,18 +37,10 @@ def main():
     except (IndexError, KeyError):
         sys.exit("usage: build.py [sdist|wheel]")
 
-    subprocess.run(
-        cmd + ["-o", str(dist_dir)] + sys.argv[2:], check=True, cwd=str(crate_dir)
+    return subprocess.call(
+        cmd + ["-o", str(dist_dir)] + sys.argv[2:], cwd=str(crate_dir)
     )
 
-    # maturin doesn't add the license text to the wheel archive yet so we
-    # have to do it ourselves: cf. https://github.com/PyO3/maturin/issues/829
-    for wheel_file in dist_dir.glob("pngquant*.whl"):
-        with InWheel(in_wheel=str(wheel_file), out_wheel=str(wheel_file)) as tmpdir:
-            distinfo = next(Path(tmpdir).glob("*.dist-info"))
-            assert distinfo.is_dir()
-            shutil.copyfile(crate_dir / "COPYRIGHT", distinfo / "LICENSE")
-
 
 if __name__ == "__main__":
     sys.exit(main())

requirements.txt

@@ -2,4 +2,3 @@ maturin
 tomli
 tomli-w
 twine
-wheeltools