Check whether WSL is installed (#5434)

* Clear libmamba `.solv` cache (#5428)

* Check WSL exists first

conda_build/build.py

@@ -1738,7 +1738,10 @@ def bundle_conda(
             if (
                 # WSL bash is always the same path, it is an alias to the default
                 # distribution as configured by the user
-                on_win and Path("C:\\Windows\\System32\\bash.exe").samefile(args[0])
+                on_win
+                # check if WSL is installed before calling Path.samefile/os.stat
+                and (wsl_bash := Path("C:\\Windows\\System32\\bash.exe")).exists()
+                and wsl_bash.samefile(args[0])
             ):
                 raise CondaBuildUserError(
                     "WSL bash.exe is not supported. Please use MSYS2 packages. Add "

news/5434-check-for-WSL

@@ -0,0 +1,19 @@
+### Enhancements
+
+* <news item>
+
+### Bug fixes
+
+* Check for WSL existence before calling `os.stat`. (#5433 via #5434)
+
+### Deprecations
+
+* <news item>
+
+### Docs
+
+* <news item>
+
+### Other
+
+* <news item>

tests/test_api_build.py

@@ -1963,8 +1963,13 @@ def test_activated_prefixes_in_actual_path(testing_metadata):
 
 @pytest.mark.parametrize("add_pip_as_python_dependency", [False, True])
 def test_add_pip_as_python_dependency_from_condarc_file(
-    testing_metadata, testing_workdir, add_pip_as_python_dependency, monkeypatch
-):
+    testing_metadata: MetaData,
+    testing_workdir: str | os.PathLike,
+    add_pip_as_python_dependency: bool,
+    monkeypatch: MonkeyPatch,
+    mocker: MockerFixture,
+    tmp_path: Path,
+) -> None:
     """
     Test whether settings from .condarc files are needed.
     ref: https://github.com/conda/conda-libmamba-solver/issues/393
@@ -1976,6 +1981,10 @@ def test_add_pip_as_python_dependency_from_condarc_file(
     # SubdirData's cache doesn't distinguish on add_pip_as_python_dependency.
     SubdirData._cache_.clear()
 
+    # clear cache
+    mocker.patch("conda.base.context.Context.pkgs_dirs", pkgs_dirs := (str(tmp_path),))
+    assert context.pkgs_dirs == pkgs_dirs
+
     testing_metadata.meta["build"]["script"] = ['python -c "import pip"']
     testing_metadata.meta["requirements"]["host"] = ["python"]
     del testing_metadata.meta["test"]