add a warning when setuptools dynamic version in pyproject is used in error

Author: RonnyPfannschmidt

src/setuptools_scm/_config.py

@@ -310,7 +310,6 @@ def from_data(
         # Handle nested SCM configuration
 
         scm_config = ScmConfiguration.from_data(scm_data)
-
         return cls(
             relative_to=relative_to,
             version_cls=version_cls,

src/setuptools_scm/_integration/pyproject_reading.py

@@ -228,6 +228,18 @@ def read_pyproject(
         requires,
     )
 
+    setuptools_dynamic_version = (
+        defn.get("tool", {})
+        .get("setuptools", {})
+        .get("dynamic", {})
+        .get("version", None)
+    )
+    if setuptools_dynamic_version is not None:
+        warnings.warn(
+            f"{path}: at [tool.setuptools.dynamic]\n"
+            "version = {attr = ...} is sabotaging setuptools-scm"
+        )
+
     return pyproject_data
 
 

testing/test_pyproject_reading.py

@@ -126,3 +126,23 @@ def test_read_pyproject_with_given_definition(monkeypatch: pytest.MonkeyPatch) -
     )
 
     assert res.should_infer()
+
+
+def test_read_pyproject_with_setuptools_dynamic_version_warns() -> None:
+    with pytest.warns(
+        UserWarning,
+        match=r"pyproject.toml: at \[tool\.setuptools\.dynamic\]\n"
+        r"version = {attr = \.\.\.} is sabotaging setuptools-scm",
+    ):
+        pyproject_data = read_pyproject(
+            _given_definition={
+                "build-system": {"requires": ["setuptools-scm[simple]"]},
+                "project": {"name": "test-package", "dynamic": ["version"]},
+                "tool": {
+                    "setuptools": {
+                        "dynamic": {"version": {"attr": "test_package.__version__"}}
+                    }
+                },
+            }
+        )
+    assert pyproject_data.project_version is None