Handle cold Windows runner startup and verify PyPI artifacts

.github/workflows/publish.yml

@@ -1,6 +1,11 @@
 name: Publish Python package
 on:
   workflow_dispatch:
+    inputs:
+      tag:
+        description: Existing GitHub release tag
+        required: true
+        default: v0.1.0b1
 permissions:
   contents: read
 jobs:
@@ -13,7 +18,9 @@ jobs:
           python-version: '3.15'
       - run: python -m pip install .[dev] twine
       - run: python -m pytest -q
-      - run: python -m build
+      - run: python tools/download_release_artifacts.py
+        env:
+          RELEASE_TAG: ${{ inputs.tag }}
       - run: python -m twine check dist/*
       - run: python tools/check_release.py
       - uses: actions/upload-artifact@v4

docs/RELEASING.md

@@ -55,8 +55,9 @@ Environment: pypi
 
 No long-lived PyPI token is required by the prepared workflow. The PyPI account owner
 must authorize the publisher (a pending publisher can create the first project).
-The manually triggered publication workflow runs tests, builds distributions,
-checks metadata and public runtime availability, then publishes through OIDC.
+The manually triggered publication workflow runs tests, downloads the exact existing
+GitHub release wheel/sdist, verifies their GitHub SHA-256 digests, checks metadata and
+public runtime availability, then publishes those same bytes through OIDC.
 [PyPI Trusted Publishing](https://docs.pypi.org/trusted-publishers/using-a-publisher/)
 
 The CI workflow tests installed packages on Windows/Linux/macOS. Hosted runners have

tests/test_service_helper.py

@@ -72,7 +72,7 @@ def quote(path):
         ],
         capture_output=True,
         text=True,
-        timeout=10,
+        timeout=30,  # Cold PowerShell startup can exceed 10s on a hosted Windows runner.
     )
     assert result.returncode == 0, result.stderr
     service = json.loads(mock_output.read_text(encoding="utf-8-sig"))

tools/download_release_artifacts.py

@@ -0,0 +1,51 @@
+"""Fetch the exact published GitHub wheel and sdist for the PyPI upload job."""
+
+from __future__ import annotations
+
+import hashlib
+import json
+import os
+import urllib.request
+from pathlib import Path
+
+from source_robotics_leap_motion import __version__
+
+
+def main():
+    tag = os.environ.get("RELEASE_TAG", "v" + __version__)
+    if tag != "v" + __version__:
+        raise SystemExit("Release tag must match the tested source package version")
+    repository = "Source-Robotics/Source-Robotics-Leap-Motion"
+    request = urllib.request.Request(
+        f"https://api.github.com/repos/{repository}/releases/tags/{tag}",
+        headers={"User-Agent": "source-robotics-leap-release"},
+    )
+    with urllib.request.urlopen(request, timeout=30) as response:
+        release = json.load(response)
+    if release["draft"]:
+        raise SystemExit("A draft release cannot be published to PyPI")
+    names = {
+        f"source_robotics_leap_motion-{__version__}-py3-none-any.whl",
+        f"source_robotics_leap_motion-{__version__}.tar.gz",
+    }
+    assets = {asset["name"]: asset for asset in release["assets"]}
+    destination = Path("dist")
+    destination.mkdir(exist_ok=True)
+    for name in sorted(names):
+        asset = assets[name]
+        expected_url = f"https://github.com/{repository}/releases/download/{tag}/{name}"
+        if asset["browser_download_url"] != expected_url:
+            raise SystemExit("Unexpected release asset URL")
+        digest = asset.get("digest", "")
+        if not digest or not digest.startswith("sha256:"):
+            raise SystemExit("GitHub asset has no SHA-256 digest")
+        with urllib.request.urlopen(expected_url, timeout=30) as response:
+            data = response.read(10 * 1024 * 1024 + 1)
+        if len(data) != asset["size"] or hashlib.sha256(data).hexdigest() != digest[7:]:
+            raise SystemExit("Release artifact size or SHA-256 mismatch")
+        (destination / name).write_bytes(data)
+        print(f"Verified {name}")
+
+
+if __name__ == "__main__":
+    main()