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Bug report
Test cases that insertos.curdir ('.') intosys.path fail on WASI platforms. I think it is related how wasmtime maps directories into the runtime environment and how it sets up the current working directory. The test passes if I replace'.' with an empty string'' or remove the cachedFileFinder instance for'.' withsys.path_importer_cache.pop('.').
./test-wasi.sh test_support -m test_forget0:00:00 Run tests sequentially0:00:00 [1/1] test_supporttest test_support failed -- Traceback (most recent call last): File "/Lib/test/test_support.py", line 116, in test_forget mod = __import__(TESTFN) ^^^^^^^^^^^^^^^^^^ModuleNotFoundError: No module named '@test_66600_tmpæ'test_support failed (1 error)== Tests result: FAILURE ==The culprit seems to be an outdatedFileFinder instance:{'.': FileFinder('/.')}. The CWD is'/python-wasm/cpython/builddir/wasi/build/test_python_66600æ' when the test case is executed.
0:00:00 [1/1] test_support> /Lib/test/test_support.py(114)test_forget()-> sys.path.insert(0, os.curdir)(Pdb) p sys.path['.', '/usr/local/lib/python312.zip', '/Lib', '/build/lib.wasi-wasm32-3.12'](Pdb) pp sys.path_importer_cache{'.': FileFinder('/.'), '/Lib': FileFinder('/Lib'), '/Lib/collections': FileFinder('/Lib/collections'), '/Lib/encodings': FileFinder('/Lib/encodings'), '/Lib/importlib': FileFinder('/Lib/importlib'), '/Lib/re': FileFinder('/Lib/re'), '/Lib/test': FileFinder('/Lib/test'), '/Lib/test/libregrtest': FileFinder('/Lib/test/libregrtest'), '/Lib/test/support': FileFinder('/Lib/test/support'), '/Lib/unittest': FileFinder('/Lib/unittest'), '/Lib/urllib': FileFinder('/Lib/urllib'), '/build/lib.wasi-wasm32-3.12': FileFinder('/build/lib.wasi-wasm32-3.12'), '/usr/local/lib/python312.zip': None}(Pdb) p os.getcwd()'/python-wasm/cpython/builddir/wasi/build/test_python_66600æ'(Pdb) n> /Lib/test/test_support.py(115)test_forget()-> importlib.invalidate_caches()(Pdb) n> /Lib/test/test_support.py(116)test_forget()-> try:(Pdb) p sys.path['.', '.', '/usr/local/lib/python312.zip', '/Lib', '/build/lib.wasi-wasm32-3.12'](Pdb) pp sys.path_importer_cache{'.': FileFinder('/.'), '/Lib': FileFinder('/Lib'), '/Lib/collections': FileFinder('/Lib/collections'), '/Lib/encodings': FileFinder('/Lib/encodings'), '/Lib/importlib': FileFinder('/Lib/importlib'), '/Lib/re': FileFinder('/Lib/re'), '/Lib/test': FileFinder('/Lib/test'), '/Lib/test/libregrtest': FileFinder('/Lib/test/libregrtest'), '/Lib/test/support': FileFinder('/Lib/test/support'), '/Lib/unittest': FileFinder('/Lib/unittest'), '/Lib/urllib': FileFinder('/Lib/urllib'), '/build/lib.wasi-wasm32-3.12': FileFinder('/build/lib.wasi-wasm32-3.12'), '/usr/local/lib/python312.zip': None}A build on Linux has an absolute path to build directory as firstsys.path entry.
reproducer
$ podman run --rm -ti -v $(pwd):/python-wasm/cpython:Z quay.io/tiran/cpythonbuild:emsdk3# ./build-python-build.sh# ./build-python-wasi.sh# ./test-wasi.sh test_support -m test_forget