bpo-40280: Skip subprocess-based tests on wasm32-emscripten (GH-30615)

Lib/distutils/tests/test_build_clib.py

@@ -4,7 +4,9 @@
 import sys
 import sysconfig
 
-from test.support import run_unittest, missing_compiler_executable
+from test.support import (
+    run_unittest, missing_compiler_executable, requires_subprocess
+)
 
 from distutils.command.build_clib import build_clib
 from distutils.errors import DistutilsSetupError
@@ -112,6 +114,7 @@ def test_finalize_options(self):
         self.assertRaises(DistutilsSetupError, cmd.finalize_options)
 
     @unittest.skipIf(sys.platform == 'win32', "can't test on Windows")
+    @requires_subprocess()
     def test_run(self):
         pkg_dir, dist = self.create_dist()
         cmd = build_clib(dist)

Lib/distutils/tests/test_build_ext.py

@@ -56,6 +56,7 @@ def tearDown(self):
     def build_ext(self, *args, **kwargs):
         return build_ext(*args, **kwargs)
 
+    @support.requires_subprocess()
     def test_build_ext(self):
         cmd = support.missing_compiler_executable()
         if cmd is not None:
@@ -332,6 +333,7 @@ def test_compiler_option(self):
         cmd.run()
         self.assertEqual(cmd.compiler, 'unix')
 
+    @support.requires_subprocess()
     def test_get_outputs(self):
         cmd = support.missing_compiler_executable()
         if cmd is not None:

Lib/distutils/tests/test_build_py.py

@@ -9,7 +9,7 @@
 from distutils.errors import DistutilsFileError
 
 from distutils.tests import support
-from test.support import run_unittest
+from test.support import run_unittest, requires_subprocess
 
 
 class BuildPyTestCase(support.TempdirManager,
@@ -89,6 +89,7 @@ def test_empty_package_dir(self):
             self.fail("failed package_data test when package_dir is ''")
 
     @unittest.skipIf(sys.dont_write_bytecode, 'byte-compile disabled')
+    @requires_subprocess()
     def test_byte_compile(self):
         project_dir, dist = self.create_dist(py_modules=['boiledeggs'])
         os.chdir(project_dir)
@@ -106,6 +107,7 @@ def test_byte_compile(self):
                          ['boiledeggs.%s.pyc' % sys.implementation.cache_tag])
 
     @unittest.skipIf(sys.dont_write_bytecode, 'byte-compile disabled')
+    @requires_subprocess()
     def test_byte_compile_optimized(self):
         project_dir, dist = self.create_dist(py_modules=['boiledeggs'])
         os.chdir(project_dir)

Lib/distutils/tests/test_config_cmd.py

@@ -3,7 +3,9 @@
 import os
 import sys
 import sysconfig
-from test.support import run_unittest, missing_compiler_executable
+from test.support import (
+    run_unittest, missing_compiler_executable, requires_subprocess
+)
 
 from distutils.command.config import dump_file, config
 from distutils.tests import support
@@ -42,6 +44,7 @@ def test_dump_file(self):
         self.assertEqual(len(self._logs), numlines+1)
 
     @unittest.skipIf(sys.platform == 'win32', "can't test on Windows")
+    @requires_subprocess()
     def test_search_cpp(self):
         cmd = missing_compiler_executable(['preprocessor'])
         if cmd is not None:

Lib/distutils/tests/test_install.py

@@ -5,7 +5,7 @@
 import unittest
 import site
 
-from test.support import captured_stdout, run_unittest
+from test.support import captured_stdout, run_unittest, requires_subprocess
 
 from distutils import sysconfig
 from distutils.command.install import install, HAS_USER_SITE
@@ -208,6 +208,7 @@ def test_record(self):
                     'UNKNOWN-0.0.0-py%s.%s.egg-info' % sys.version_info[:2]]
         self.assertEqual(found, expected)
 
+    @requires_subprocess()
     def test_record_extensions(self):
         cmd = test_support.missing_compiler_executable()
         if cmd is not None:

Lib/distutils/tests/test_install_lib.py

@@ -8,7 +8,7 @@
 from distutils.extension import Extension
 from distutils.tests import support
 from distutils.errors import DistutilsOptionError
-from test.support import run_unittest
+from test.support import run_unittest, requires_subprocess
 
 
 class InstallLibTestCase(support.TempdirManager,
@@ -35,6 +35,7 @@ def test_finalize_options(self):
         self.assertEqual(cmd.optimize, 2)
 
     @unittest.skipIf(sys.dont_write_bytecode, 'byte-compile disabled')
+    @requires_subprocess()
     def test_byte_compile(self):
         project_dir, dist = self.create_dist()
         os.chdir(project_dir)
@@ -90,6 +91,7 @@ def test_get_inputs(self):
         inputs = cmd.get_inputs()
         self.assertEqual(len(inputs), 2, inputs)
 
+    @requires_subprocess()
     def test_dont_write_bytecode(self):
         # makes sure byte_compile is not used
         dist = self.create_dist()[1]

Lib/distutils/tests/test_spawn.py

@@ -3,14 +3,16 @@
 import stat
 import sys
 import unittest.mock
-from test.support import run_unittest, unix_shell
+from test.support import run_unittest, unix_shell, requires_subprocess
 from test.support import os_helper
 
 from distutils.spawn import find_executable
 from distutils.spawn import spawn
 from distutils.errors import DistutilsExecError
 from distutils.tests import support
 
+
+@requires_subprocess()
 class SpawnTestCase(support.TempdirManager,
                     support.LoggingSilencer,
                     unittest.TestCase):

Lib/distutils/tests/test_sysconfig.py

@@ -10,7 +10,7 @@
 from distutils import sysconfig
 from distutils.ccompiler import get_default_compiler
 from distutils.tests import support
-from test.support import run_unittest, swap_item
+from test.support import run_unittest, swap_item, requires_subprocess
 from test.support.os_helper import TESTFN
 from test.support.warnings_helper import check_warnings
 
@@ -247,6 +247,7 @@ def test_SO_in_vars(self):
         self.assertIsNotNone(vars['SO'])
         self.assertEqual(vars['SO'], vars['EXT_SUFFIX'])
 
+    @requires_subprocess()
     def test_customize_compiler_before_get_config_vars(self):
         # Issue #21923: test that a Distribution compiler
         # instance can be called without an explicit call to

Lib/lib2to3/tests/test_parser.py

@@ -61,6 +61,9 @@ def test_load_grammar_from_pickle(self):
             shutil.rmtree(tmpdir)
 
     @unittest.skipIf(sys.executable is None, 'sys.executable required')
+    @unittest.skipIf(
+        sys.platform == 'emscripten', 'requires working subprocess'
+    )
     def test_load_grammar_from_subprocess(self):
         tmpdir = tempfile.mkdtemp()
         tmpsubdir = os.path.join(tmpdir, 'subdir')

Lib/test/support/__init__.py

@@ -40,11 +40,12 @@
     "bigmemtest", "bigaddrspacetest", "cpython_only", "get_attribute",
     "requires_IEEE_754", "requires_zlib",
     "has_fork_support", "requires_fork",
+    "has_subprocess_support", "requires_subprocess",
     "anticipate_failure", "load_package_tests", "detect_api_mismatch",
     "check__all__", "skip_if_buggy_ucrt_strfptime",
     "check_disallow_instantiation",
     # sys
-    "is_jython", "is_android", "is_emscripten",
+    "is_jython", "is_android", "is_emscripten", "is_wasi",
     "check_impl_detail", "unix_shell", "setswitchinterval",
     # network
     "open_urlresource",
@@ -467,15 +468,23 @@ def requires_debug_ranges(reason='requires co_positions / debug_ranges'):
 else:
     unix_shell = None
 
-# wasm32-emscripten is POSIX-like but does not provide a
-# working fork() or subprocess API.
+# wasm32-emscripten and -wasi are POSIX-like but do not
+# have subprocess or fork support.
 is_emscripten = sys.platform == "emscripten"
+is_wasi = sys.platform == "wasi"
 
-has_fork_support = hasattr(os, "fork") and not is_emscripten
+has_fork_support = hasattr(os, "fork") and not is_emscripten and not is_wasi
 
 def requires_fork():
     return unittest.skipUnless(has_fork_support, "requires working os.fork()")
 
+has_subprocess_support = not is_emscripten and not is_wasi
+
+def requires_subprocess():
+    """Used for subprocess, os.spawn calls"""
+    return unittest.skipUnless(has_subprocess_support, "requires subprocess support")
+
+
 # Define the URL of a dedicated HTTP server for the network tests.
 # The URL must use clear-text HTTP: no redirection to encrypted HTTPS.
 TEST_HTTP_URL = "http://www.pythontest.net"

Lib/test/support/script_helper.py

@@ -42,6 +42,10 @@ def interpreter_requires_environment():
         if 'PYTHONHOME' in os.environ:
             __cached_interp_requires_environment = True
             return True
+        # cannot run subprocess, assume we don't need it
+        if not support.has_subprocess_support:
+            __cached_interp_requires_environment = False
+            return False
 
         # Try running an interpreter with -E to see if it works or not.
         try:
@@ -87,6 +91,7 @@ def fail(self, cmd_line):
 
 
 # Executing the interpreter in a subprocess
+@support.requires_subprocess()
 def run_python_until_end(*args, **env_vars):
     env_required = interpreter_requires_environment()
     cwd = env_vars.pop('__cwd', None)
@@ -139,6 +144,7 @@ def run_python_until_end(*args, **env_vars):
     return _PythonRunResult(rc, out, err), cmd_line
 
 
+@support.requires_subprocess()
 def _assert_python(expected_success, /, *args, **env_vars):
     res, cmd_line = run_python_until_end(*args, **env_vars)
     if (res.rc and expected_success) or (not res.rc and not expected_success):
@@ -171,6 +177,7 @@ def assert_python_failure(*args, **env_vars):
     return _assert_python(False, *args, **env_vars)
 
 
+@support.requires_subprocess()
 def spawn_python(*args, stdout=subprocess.PIPE, stderr=subprocess.STDOUT, **kw):
     """Run a Python subprocess with the given arguments.
 
@@ -273,6 +280,7 @@ def make_zip_pkg(zip_dir, zip_basename, pkg_name, script_basename,
     return zip_name, os.path.join(zip_name, script_name_in_zip)
 
 
+@support.requires_subprocess()
 def run_test_script(script):
     # use -u to try to get the full output if the test hangs or crash
     if support.verbose:

Lib/test/test_audit.py

@@ -16,6 +16,8 @@
 
 
 class AuditTest(unittest.TestCase):
+
+    @support.requires_subprocess()
     def do_test(self, *args):
         with subprocess.Popen(
             [sys.executable, "-Xutf8", AUDIT_TESTS_PY, *args],
@@ -29,6 +31,7 @@ def do_test(self, *args):
             if p.returncode:
                 self.fail("".join(p.stderr))
 
+    @support.requires_subprocess()
     def run_python(self, *args):
         events = []
         with subprocess.Popen(

Lib/test/test_capi.py

@@ -66,6 +66,7 @@ def test_instancemethod(self):
         self.assertEqual(testfunction.attribute, "test")
         self.assertRaises(AttributeError, setattr, inst.testfunction, "attribute", "test")
 
+    @support.requires_subprocess()
     def test_no_FatalError_infinite_loop(self):
         with support.SuppressCrashReport():
             p = subprocess.Popen([sys.executable, "-c",

Lib/test/test_cmd_line.py

@@ -15,6 +15,8 @@
     interpreter_requires_environment
 )
 
+if not support.has_subprocess_support:
+    raise unittest.SkipTest("test module requires subprocess")
 
 # Debug build?
 Py_DEBUG = hasattr(sys, "gettotalrefcount")

Lib/test/test_embed.py

@@ -17,6 +17,8 @@
 import tempfile
 import textwrap
 
+if not support.has_subprocess_support:
+    raise unittest.SkipTest("test module requires subprocess")
 
 MS_WINDOWS = (os.name == 'nt')
 MACOS = (sys.platform == 'darwin')

Lib/test/test_faulthandler.py

@@ -412,6 +412,7 @@ def test_is_enabled(self):
         finally:
             sys.stderr = orig_stderr
 
+    @support.requires_subprocess()
     def test_disabled_by_default(self):
         # By default, the module should be disabled
         code = "import faulthandler; print(faulthandler.is_enabled())"
@@ -420,6 +421,7 @@ def test_disabled_by_default(self):
         output = subprocess.check_output(args)
         self.assertEqual(output.rstrip(), b"False")
 
+    @support.requires_subprocess()
     def test_sys_xoptions(self):
         # Test python -X faulthandler
         code = "import faulthandler; print(faulthandler.is_enabled())"
@@ -432,6 +434,7 @@ def test_sys_xoptions(self):
         output = subprocess.check_output(args, env=env)
         self.assertEqual(output.rstrip(), b"True")
 
+    @support.requires_subprocess()
     def test_env_var(self):
         # empty env var
         code = "import faulthandler; print(faulthandler.is_enabled())"

Lib/test/test_file_eintr.py

@@ -15,12 +15,15 @@
 import sys
 import time
 import unittest
+from test import support
+
+if not support.has_subprocess_support:
+    raise unittest.SkipTest("test module requires subprocess")
 
 # Test import all of the things we're about to try testing up front.
 import _io
 import _pyio
 
-
 @unittest.skipUnless(os.name == 'posix', 'tests requires a posix system.')
 class TestFileIOSignalInterrupt:
     def setUp(self):

Lib/test/test_gc.py

@@ -1,7 +1,7 @@
 import unittest
 import unittest.mock
 from test.support import (verbose, refcount_test,
-                          cpython_only)
+                          cpython_only, requires_subprocess)
 from test.support.import_helper import import_module
 from test.support.os_helper import temp_dir, TESTFN, unlink
 from test.support.script_helper import assert_python_ok, make_script
@@ -661,6 +661,7 @@ def do_work():
         gc.collect() # this blows up (bad C pointer) when it fails
 
     @cpython_only
+    @requires_subprocess()
     def test_garbage_at_shutdown(self):
         import subprocess
         code = """if 1:

Lib/test/test_gzip.py

@@ -12,7 +12,7 @@
 from subprocess import PIPE, Popen
 from test.support import import_helper
 from test.support import os_helper
-from test.support import _4G, bigmemtest
+from test.support import _4G, bigmemtest, requires_subprocess
 from test.support.script_helper import assert_python_ok, assert_python_failure
 
 gzip = import_helper.import_module('gzip')
@@ -760,6 +760,7 @@ def wrapper(*args, **kwargs):
 class TestCommandLine(unittest.TestCase):
     data = b'This is a simple test with gzip'
 
+    @requires_subprocess()
     def test_decompress_stdin_stdout(self):
         with io.BytesIO() as bytes_io:
             with gzip.GzipFile(fileobj=bytes_io, mode='wb') as gzip_file:
@@ -795,6 +796,7 @@ def test_decompress_infile_outfile_error(self):
         self.assertEqual(rc, 1)
         self.assertEqual(out, b'')
 
+    @requires_subprocess()
     @create_and_remove_directory(TEMPDIR)
     def test_compress_stdin_outfile(self):
         args = sys.executable, '-m', 'gzip'