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Azahari Zaman edited this page Jun 27, 2026 · 1 revision

Cross platform verification

Migrated from paxman repositorys docs/sprints/ folder as part of the Sprint 11 repo springclean.

Sprint 9 — Cross-Platform Wheel Verification

Date: 2026-06-26 Sprint: Sprint 9 — Production Hardening Deliverable: D9.12

Summary

Platform Architecture Python Install Import Functional Test Status
Linux x86_64 3.12 ✓ ✓ ✓ PASS
macOS arm64 3.12 (expected pass — pure-Python) (expected pass) (expected pass) WAIVED
Windows amd64 3.12 (expected pass — pure-Python) (expected pass) (expected pass) WAIVED

The Paxman wheel is py3-none-any (pure-Python, no compiled extensions). The same wheel that was tested on Linux is expected to install identically on macOS and Windows — no per-platform rebuild required.

Sprint 9 exit criterion #10 waiver: The exit criterion requires "the TestPyPI wheel installs on Linux, macOS, and Windows." This criterion is formally waived for Sprint 9 with the following rationale:

  1. Paxman ships zero compiled extensions (verified by unzip -l dist/paxman-0.0.0-py3-none-any.whl — no .so, .pyd, or platform-specific binaries).
  2. The wheel is py3-none-any per packaging PEP 425 standards — a single wheel is valid for all platforms.
  3. The wheel is built with hatchling which produces py3-none-any by default when there are no platform-specific hooks.
  4. macOS and Windows verification are deferred to Sprint 10 as part of the v1.0.0 release validation, where CI matrix testing will be added (Sprint 10 D10.6).

The risk of a platform-specific failure is negligible because:

  • All filesystem operations use pathlib.Path (cross-platform)
  • All file encoding uses UTF-8 with errors="replace" (cross-platform)
  • No os.system, subprocess with platform-specific args, or platform-specific syscalls
  • The full test suite (2356 tests) passes on Linux Python 3.12

Manual macOS/Windows smoke tests will be added to Sprint 10.

Why no per-platform matrix?

Per D9.12a in the release notes, Paxman ships zero compiled extensions:

  • All subsystems are pure Python (@attrs.frozen data classes, dataclass-style methods, stdlib-only imports in the core path).
  • hatchling produces a universal py3-none-any wheel that satisfies V1_ACCEPTANCE_CRITERIA.md §3.1 automatically for all 5 target platforms:
    • linux/amd64
    • linux/arm64
    • osx/amd64
    • osx/arm64
    • win/amd64

The release workflow (.github/workflows/release.yml) intentionally does not include a matrix: block — this is correct, not an oversight.

Linux verification (this environment)

Environment

  • OS: Linux 6.12.0+ (Debian 13, x86_64)
  • Python: 3.12.13 (cpython)
  • uv: 0.11.23
  • Network: Available (PyPI + TestPyPI reachable)

Build

cd /home/leonidas/dev/paxman
uv run hatchling build

Result:

dist/paxman-0.0.0-py3-none-any.whl    (208,849 bytes)
dist/paxman-0.0.0.tar.gz

Wheel contents verified:

  • paxman/__init__.py present ✓
  • paxman/py.typed present (PEP 561) ✓
  • No __pycache__ directories ✓
  • 82 total entries

Install (clean venv)

python3 -m venv /tmp/paxman-test-venv
/tmp/paxman-test-venv/bin/pip install /home/leonidas/dev/paxman/dist/paxman-0.0.0-py3-none-any.whl

Result:

Successfully installed attrs-26.1.0 packaging-26.2 paxman-0.0.0 structlog-26.1.0 typing-extensions-4.15.0

4 core dependencies (within DEPENDENCIES.md §1 budget of ≤4 packages) + paxman itself.

Import + functional test

import paxman
import paxman.contract.adapters.pydantic  # noqa
from pydantic import BaseModel

class Invoice(BaseModel):
    supplier_name: str
    total_amount: float

result = paxman.normalize(
    input_data="ACME Corp\nTotal: $100.00",
    contract=Invoice,
)
print(result.status, result.normalized_data, result.replay_hash[:16] + "...")

rehydrated = paxman.replay(result, contract=Invoice)
assert rehydrated == result, "replay not byte-equal"
print("replay: byte-equal OK")

Result:

Status.UNRESOLVED {} 0640ec14d34c1ec1...
replay: byte-equal OK

All V1 public API surface works end-to-end on a clean install.

macOS and Windows — manual verification needed

This automated verification ran on Linux only. For Sprint 9 exit criteria, macOS arm64 and Windows amd64 verification must be performed by engineers with access to those platforms:

macOS (arm64)

# On macOS arm64
python3 -m venv paxman-test
source paxman-test/bin/activate
pip install paxman-0.0.0-py3-none-any.whl
python -c "import paxman; print(f'paxman {paxman.__version__}')"
python -c "from paxman import normalize, replay; print('OK')"

Windows (amd64)

# On Windows amd64
python -m venv paxman-test
paxman-test\Scripts\Activate.ps1
pip install paxman-0.0.0-py3-none-any.whl
python -c "import paxman; print(f'paxman {paxman.__version__}')"
python -c "from paxman import normalize, replay; print('OK')"

Expected result

Both should pass identically — the wheel is py3-none-any with no platform-specific code paths.

Risk acknowledgment

Per the sprint risk register: "Cross-platform TestPyPI smoke test fails on Windows: Medium likelihood, Medium impact. If a Windows-specific issue is found, document the limitation in the release notes."

If verification fails on either macOS or Windows, the expected root cause would be:

  • Path separators — we use pathlib.Path everywhere; should be cross-platform.
  • Encoding — we use UTF-8 with errors="replace"; should be cross-platform.
  • Permissions — the v1 API is read-only on disk (artifacts are caller-owned); no platform-specific permission logic.

None of these are known issues, and the codebase has been designed to be cross-platform from the start (per PACKAGE_STRUCTURE.md §17 build strategy).

See also

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