ci: new regression test for the Python module

Signed-off-by: d9pouces <github@19pouces.net>

tests/dockerfiles/repos/build_test_wheel.py

@@ -0,0 +1,80 @@
+"""Build a minimal, offline, hand-rolled wheel and PEP 503 "simple" index for
+integration-testing the `python` module of id-configurator.
+
+No network access and no build backend (setuptools/build/pip) are used: the
+wheel is a plain zip file assembled with the standard library only, so this
+script can run in a minimal Python image with nothing installed.
+"""
+
+from __future__ import annotations
+
+import base64
+import hashlib
+import pathlib
+import zipfile
+
+PACKAGE = "idconfiguratortestpkg"
+VERSION = "0.0.1"
+WHEEL_NAME = f"{PACKAGE}-{VERSION}-py3-none-any.whl"
+OUT_DIR = pathlib.Path("/srv")
+
+METADATA = f"""Metadata-Version: 2.1
+Name: {PACKAGE}
+Version: {VERSION}
+Summary: Test-only package served by the id-configurator integration tests
+"""
+
+WHEEL_FILE = """Wheel-Version: 1.0
+Generator: id-configurator-tests
+Root-Is-Purelib: true
+Tag: py3-none-any
+"""
+
+INIT_PY = '"""Test-only package used to verify the python module mirror."""\n'
+
+
+def _record_line(path: str, content: bytes) -> str:
+    digest = base64.urlsafe_b64encode(hashlib.sha256(content).digest()).rstrip(b"=")
+    return f"{path},sha256={digest.decode('ascii')},{len(content)}"
+
+
+def build_wheel(packages_dir: pathlib.Path) -> bytes:
+    dist_info = f"{PACKAGE}-{VERSION}.dist-info"
+    files = {
+        f"{PACKAGE}/__init__.py": INIT_PY.encode("utf-8"),
+        f"{dist_info}/METADATA": METADATA.encode("utf-8"),
+        f"{dist_info}/WHEEL": WHEEL_FILE.encode("utf-8"),
+    }
+    record_lines = [_record_line(name, content) for name, content in files.items()]
+    record_lines.append(f"{dist_info}/RECORD,,")
+    files[f"{dist_info}/RECORD"] = ("\n".join(record_lines) + "\n").encode("utf-8")
+
+    packages_dir.mkdir(parents=True, exist_ok=True)
+    wheel_path = packages_dir / WHEEL_NAME
+    with zipfile.ZipFile(wheel_path, "w", zipfile.ZIP_DEFLATED) as archive:
+        for name, content in files.items():
+            archive.writestr(name, content)
+    return wheel_path.read_bytes()
+
+
+def write_simple_index(simple_dir: pathlib.Path, wheel_content: bytes) -> None:
+    package_dir = simple_dir / PACKAGE
+    package_dir.mkdir(parents=True, exist_ok=True)
+    digest = hashlib.sha256(wheel_content).hexdigest()
+    html = f"""<!DOCTYPE html>
+<html>
+  <body>
+    <a href="../../packages/{WHEEL_NAME}#sha256={digest}">{WHEEL_NAME}</a>
+  </body>
+</html>
+"""
+    (package_dir / "index.html").write_text(html, encoding="utf-8")
+
+
+def main() -> None:
+    wheel_content = build_wheel(OUT_DIR / "packages")
+    write_simple_index(OUT_DIR / "simple", wheel_content)
+
+
+if __name__ == "__main__":
+    main()