fix: don't require a specific python interpreter for uv

craft_parts/plugins/uv_plugin.py

@@ -98,8 +98,14 @@ def _get_rewrite_shebangs_commands(self) -> list[str]:
         return []
 
     def _get_create_venv_commands(self) -> list[str]:
+        # Explicitly request a Python version if provided by the plugin, otherwise use the global
+        # parts interpreter.
+        python_ver = (
+            self._get_system_python_interpreter()
+            or "$(which ${PARTS_PYTHON_INTERPRETER})"
+        )
         return [
-            f'uv venv --relocatable --allow-existing --python "{self._get_system_python_interpreter()}" "{self._get_venv_directory()}"',
+            f'uv venv --relocatable --allow-existing --python {python_ver} "{self._get_venv_directory()}"',
             f'PARTS_PYTHON_VENV_INTERP_PATH="{self._get_venv_directory()}/bin/${{PARTS_PYTHON_INTERPRETER}}"',
         ]
 

docs/reference/changelog.rst

@@ -2,6 +2,14 @@
 Changelog
 *********
 
+X.X.X (2025-MM-DD)
+------------------
+
+Bug fixes:
+
+- Allow for a non-specific system Python interpreter when using the
+  :ref:`uv plugin<craft_parts_uv_plugin>`.
+
 2.5.0 (2025-01-30)
 ------------------
 

tests/integration/plugins/test_uv.py

@@ -148,9 +148,11 @@ def _should_remove_symlinks(self) -> bool:
     )
     actions = lf.plan(Step.PRIME)
 
-    with lf.action_executor() as ctx, pytest.raises(errors.PluginBuildError):
+    with lf.action_executor() as ctx, pytest.raises(errors.PluginBuildError) as exc:
         ctx.execute(actions)
 
+    assert b"No suitable Python interpreter found" in cast(bytes, exc.value.stderr)
+
 
 def test_uv_plugin_remove_symlinks(new_dir, partitions, uv_parts_simple):
     """Override symlink removal."""