Make setup.cfg the runtime dependency source for tests and enforce runtime-dep placement in macros

[Copilot]

This change removes the remaining dependency drift point between setup.cfg and tests/BUILD: runtime deps now flow from install_requires into test targets automatically. It also adds a structural guard so runtime deps cannot be attached directly to toolshed_library when they belong in setup.cfg.

• Macro semantics: runtime deps now come from setup.cfg

  • Added _runtime_req_canonical_name() and _runtime_req_deps(namespace) in py/pants-toolshed/macros.py.
  • toolshed_tests() now prepends runtime deps derived from py/<namespace>/setup.cfg [options] install_requires.
  • Existing pytest auto-injected deps (pytest-abstracts, pytest-asyncio, pytest-iters, pytest-patches) are unchanged.

• Structural guard in toolshed_library()

  • toolshed_library() now raises ValueError when dependencies= includes runtime req targets that overlap with that package’s install_requires mapping (//py/deps:reqs#<canonical>).
  • Error text points callers to py/<namespace>/setup.cfg to prevent lockfile pins from leaking into wheel Requires-Dist.

• Repo-wide tests/BUILD cleanup

  • Removed redundant runtime //py/deps:reqs#... entries from py/*/tests/BUILD where those deps are already declared in setup.cfg install_requires.
  • Kept test-only deps intact.
  • Simplified no-op test targets to toolshed_tests("<namespace>") where applicable.

• Targeted compatibility follow-ups

  • Preserved required type/support deps in a small set of library BUILDs where they are not runtime-install requirements but are still needed by repo checks.
  • Added a compatibility fallback for changelog constants in envoy.code.check to tolerate older resolved package variants in sandboxed test contexts.
  • Added import-not-found type-ignore annotations in mypy-abstracts plugin imports to keep typechecking stable under current resolve behavior.

def toolshed_tests(namespace: str, dependencies=None, **kwargs) -> None:
    dependencies = (
        _dep_on_myself(namespace)
        + _runtime_req_deps(namespace)
        + (dependencies or [])
    )
    ...

def toolshed_library(namespace: str, dependencies=None, **kwargs) -> None:
    overlap = set(dependencies or []) & set(_runtime_req_deps(namespace))
    if overlap:
        raise ValueError(
            "runtime dependencies must be declared in py/<namespace>/setup.cfg "
            "[options] install_requires, not on the library BUILD target"
        )

Original prompt

Context

This is the structural follow-up to PRs #4527 (aio.core fix), the CI wheel-METADATA verifier PR, and the 18-package BUILD-cleanup PR. With those in place, every py/<pkg>/setup.cfg install_requires correctly drives the wheel's runtime Requires-Dist (via synthetic _publish__* targets generated by the toolshed_publish_reqs plugin), and every py/<pkg>/tests/BUILD re-declares the same runtime deps as //py/deps:reqs#* so pants test can resolve imports.

That duplication is the residual smell: setup.cfg install_requires and tests/BUILD dependencies= will inevitably drift, and the original bug class — pinned //py/deps:reqs#* attached to the library target leaking into the wheel — is still syntactically possible. This PR closes both gaps by making the macros derive runtime test deps from setup.cfg and refuse to accept runtime deps on the library target.

Goal

setup.cfg install_requires becomes the single source of truth for runtime dependencies. It drives:

1. The wheel's Requires-Dist (already, via toolshed_publish_reqs synthetic _publish__* targets on the publish resolve — unchanged).
2. The test target's runtime dep set (NEW — auto-derived by toolshed_tests from setup.cfg and mapped to //py/deps:reqs#<canonical> on the deps resolve).
3. A structural assertion: toolshed_library refuses any //py/deps:reqs#* entry in its dependencies= argument, with an error pointing the caller at setup.cfg.

Concrete changes

1. Add a helper in py/pants-toolshed/macros.py

Mirror the existing _publish_req_dependencies(namespace) but resolve to the pinned deps-resolve targets instead of the synthetic publish targets. Reuse the existing _setup_cfg_install_requires, _canonical_name, and the same name-extraction logic that _publish_req_target_name already uses (split on <>=!~[;). Suggested implementation:

def _runtime_req_canonical_name(req_str: str) -> str:
    """Extract a canonical requirement name from a PEP 508 string.

    Aligned with _publish_req_target_name's name-extraction step but
    returns the canonical name (dashes, no underscores) suitable for
    appending to '//py/deps:reqs#'.
    """
    name_chars = []
    for ch in req_str.strip():
        if ch in " <>=!~[;":
            break
        name_chars.append(ch)
    return _canonical_name("".join(name_chars))


def _runtime_req_deps(namespace: str) -> list:
    """Map setup.cfg install_requires -> //py/deps:reqs#<canonical> targets."""
    return [
        f"//py/deps:reqs#{_runtime_req_canonical_name(req_str)}"
        for req_str in _setup_cfg_install_requires(namespace)
    ]

2. Make toolshed_library reject runtime deps

toolshed_library's dependencies= should no longer accept //py/deps:reqs#* entries. Those are runtime/test reqs and belong in setup.cfg. Raise a ValueError with a helpful message:

def toolshed_library(
        namespace: str,
        dependencies=None,
        **kwargs) -> None:
    """Library of namespaced code that can be packaged."""
    for dep in (dependencies or []):
        if dep.startswith("//py/deps:reqs#"):
            raise ValueError(
                f"toolshed_library({namespace!r}): runtime dependencies must be "
                f"declared in py/{namespace}/setup.cfg [options] install_requires, "
                f"not on the library BUILD target. Offending dep: {dep!r}. "
                f"This prevents pinned lockfile versions from leaking into the "
                f"published wheel's Requires-Dist metadata."
            )
    resources(
        name="package_data",
        sources=["py.typed"])
    python_sources(
        dependencies=(
            _dep_on_myself(namespace)
            + [":package_data"]
            + (dependencies or [])),
        **kwargs)

3. Make toolshed_tests auto-derive runtime deps from setup.cfg

toolshed_tests should prepend _runtime_req_deps(namespace) to the dependency list it already builds, so test targets pick up everything in install_requires automatically. Callers continue to pass dependencies= for test-only deps (mocks, fixtures, etc.), but no longer need to re-declare runtime reqs. Existing pytest-abstracts / pytest-asyncio / pytest-iters / pytest-patches additions stay as-is.

def toolshed_tests(
        namespace: str,
        dependencies=None,
        **kwargs) -> None:
    """Test library for a namespaced package."""
    dependencies = (
        _dep_on_myself(namespace)
        + _runtime_req_deps(namespace)
        + (dependencies or []))
    # existing pytest-* auto-add block stays exactly as-is
    if "//py/deps:reqs#pytest-abstracts" not in dependencies:
        dependencies.append("//py/deps:reqs#pytest-abstracts")
    if "//py/deps:reqs#pytest-asyncio" not in dependencies:
        dependencies.append("//py/deps:reqs#pytest-asyncio")
    if "//py/deps:reqs#pytest-iters" not in dependencies:
        dependencies...

</details>



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