import unittest from test import support import subprocess import sys import signal import os import errno import tempfile import time import re import sysconfig try: import gc except ImportError: gc = None mswindows = (sys.platform == "win32") # # Depends on the following external programs: Python # if mswindows: SETBINARY = ('import msvcrt; msvcrt.setmode(sys.stdout.fileno(), ' 'os.O_BINARY);') else: SETBINARY = '' try: mkstemp = tempfile.mkstemp except AttributeError: # tempfile.mkstemp is not available def mkstemp(): """Replacement for mkstemp, calling mktemp.""" fname = tempfile.mktemp() return os.open(fname, os.O_RDWR|os.O_CREAT), fname class BaseTestCase(unittest.TestCase): def setUp(self): # Try to minimize the number of children we have so this test # doesn't crash on some buildbots (Alphas in particular). support.reap_children() def tearDown(self): for inst in subprocess._active: inst.wait() subprocess._cleanup() self.assertFalse(subprocess._active, "subprocess._active not empty") def assertStderrEqual(self, stderr, expected, msg=None): # In a debug build, stuff like "[6580 refs]" is printed to stderr at # shutdown time. That frustrates tests trying to check stderr produced # from a spawned Python process. actual = re.sub("\[\d+ refs\]\r?\n?$", "", stderr.decode()).encode() self.assertEqual(actual, expected, msg) class ProcessTestCase(BaseTestCase): def test_call_seq(self): # call() function with sequence argument rc = subprocess.call([sys.executable, "-c", "import sys; sys.exit(47)"]) self.assertEqual(rc, 47) def test_check_call_zero(self): # check_call() function with zero return code rc = subprocess.check_call([sys.executable, "-c", "import sys; sys.exit(0)"]) self.assertEqual(rc, 0) def test_check_call_nonzero(self): # check_call() function with non-zero return code with self.assertRaises(subprocess.CalledProcessError) as c: subprocess.check_call([sys.executable, "-c", "import sys; sys.exit(47)"]) self.assertEqual(c.exception.returncode, 47) def test_check_output(self): # check_output() function with zero return code output = subprocess.check_output( [sys.executable, "-c", "print('BDFL')"]) self.assertIn(b'BDFL', output) def test_check_output_nonzero(self): # check_call() function with non-zero return code with self.assertRaises(subprocess.CalledProcessError) as c: subprocess.check_output( [sys.executable, "-c", "import sys; sys.exit(5)"]) self.assertEqual(c.exception.returncode, 5) def test_check_output_stderr(self): # check_output() function stderr redirected to stdout output = subprocess.check_output( [sys.executable, "-c", "import sys; sys.stderr.write('BDFL')"], stderr=subprocess.STDOUT) self.assertIn(b'BDFL', output) def test_check_output_stdout_arg(self): # check_output() function stderr redirected to stdout with self.assertRaises(ValueError) as c: output = subprocess.check_output( [sys.executable, "-c", "print('will not be run')"], stdout=sys.stdout) self.fail("Expected ValueError when stdout arg supplied.") self.assertIn('stdout', c.exception.args[0]) def test_call_kwargs(self): # call() function with keyword args newenv = os.environ.copy() newenv["FRUIT"] = "banana" rc = subprocess.call([sys.executable, "-c", 'import sys, os;' 'sys.exit(os.getenv("FRUIT")=="banana")'], env=newenv) self.assertEqual(rc, 1) def test_stdin_none(self): # .stdin is None when not redirected p = subprocess.Popen([sys.executable, "-c", 'print("banana")'], stdout=subprocess.PIPE, stderr=subprocess.PIPE) p.wait() self.assertEqual(p.stdin, None) def test_stdout_none(self): # .stdout is None when not redirected p = subprocess.Popen([sys.executable, "-c", 'print(" this bit of output is from a ' 'test of stdout in a different ' 'process ...")'], stdin=subprocess.PIPE, stderr=subprocess.PIPE) p.wait() self.assertEqual(p.stdout, None) def test_stderr_none(self): # .stderr is None when not redirected p = subprocess.Popen([sys.executable, "-c", 'print("banana")'], stdin=subprocess.PIPE, stdout=subprocess.PIPE) p.wait() self.assertEqual(p.stderr, None) def test_executable_with_cwd(self): python_dir = os.path.dirname(os.path.realpath(sys.executable)) p = subprocess.Popen(["somethingyoudonthave", "-c", "import sys; sys.exit(47)"], executable=sys.executable, cwd=python_dir) p.wait() self.assertEqual(p.returncode, 47) @unittest.skipIf(sysconfig.is_python_build(), "need an installed Python. See #7774") def test_executable_without_cwd(self): # For a normal installation, it should work without 'cwd' # argument. For test runs in the build directory, see #7774. p = subprocess.Popen(["somethingyoudonthave", "-c", "import sys; sys.exit(47)"], executable=sys.executable) p.wait() self.assertEqual(p.returncode, 47) def test_stdin_pipe(self): # stdin redirection p = subprocess.Popen([sys.executable, "-c", 'import sys; sys.exit(sys.stdin.read() == "pear")'], stdin=subprocess.PIPE) p.stdin.write(b"pear") p.stdin.close() p.wait() self.assertEqual(p.returncode, 1) def test_stdin_filedes(self): # stdin is set to open file descriptor tf = tempfile.TemporaryFile() d = tf.fileno() os.write(d, b"pear") os.lseek(d, 0, 0) p = subprocess.Popen([sys.executable, "-c", 'import sys; sys.exit(sys.stdin.read() == "pear")'], stdin=d) p.wait() self.assertEqual(p.returncode, 1) def test_stdin_fileobj(self): # stdin is set to open file object tf = tempfile.TemporaryFile() tf.write(b"pear") tf.seek(0) p = subprocess.Popen([sys.executable, "-c", 'import sys; sys.exit(sys.stdin.read() == "pear")'], stdin=tf) p.wait() self.assertEqual(p.returncode, 1) def test_stdout_pipe(self): # stdout redirection p = subprocess.Popen([sys.executable, "-c", 'import sys; sys.stdout.write("orange")'], stdout=subprocess.PIPE) self.assertEqual(p.stdout.read(), b"orange") def test_stdout_filedes(self): # stdout is set to open file descriptor tf = tempfile.TemporaryFile() d = tf.fileno() p = subprocess.Popen([sys.executable, "-c", 'import sys; sys.stdout.write("orange")'], stdout=d) p.wait() os.lseek(d, 0, 0) self.assertEqual(os.read(d, 1024), b"orange") def test_stdout_fileobj(self): # stdout is set to open file object tf = tempfile.TemporaryFile() p = subprocess.Popen([sys.executable, "-c", 'import sys; sys.stdout.write("orange")'], stdout=tf) p.wait() tf.seek(0) self.assertEqual(tf.read(), b"orange") def test_stderr_pipe(self): # stderr redirection p = subprocess.Popen([sys.executable, "-c", 'import sys; sys.stderr.write("strawberry")'], stderr=subprocess.PIPE) self.assertStderrEqual(p.stderr.read(), b"strawberry") def test_stderr_filedes(self): # stderr is set to open file descriptor tf = tempfile.TemporaryFile() d = tf.fileno() p = subprocess.Popen([sys.executable, "-c", 'import sys; sys.stderr.write("strawberry")'], stderr=d) p.wait() os.lseek(d, 0, 0) self.assertStderrEqual(os.read(d, 1024), b"strawberry") def test_stderr_fileobj(self): # stderr is set to open file object tf = tempfile.TemporaryFile() p = subprocess.Popen([sys.executable, "-c", 'import sys; sys.stderr.write("strawberry")'], stderr=tf) p.wait() tf.seek(0) self.assertStderrEqual(tf.read(), b"strawberry") def test_stdout_stderr_pipe(self): # capture stdout and stderr to the same pipe p = subprocess.Popen([sys.executable, "-c", 'import sys;' 'sys.stdout.write("apple");' 'sys.stdout.flush();' 'sys.stderr.write("orange")'], stdout=subprocess.PIPE, stderr=subprocess.STDOUT) self.assertStderrEqual(p.stdout.read(), b"appleorange") def test_stdout_stderr_file(self): # capture stdout and stderr to the same open file tf = tempfile.TemporaryFile() p = subprocess.Popen([sys.executable, "-c", 'import sys;' 'sys.stdout.write("apple");' 'sys.stdout.flush();' 'sys.stderr.write("orange")'], stdout=tf, stderr=tf) p.wait() tf.seek(0) self.assertStderrEqual(tf.read(), b"appleorange") def test_stdout_filedes_of_stdout(self): # stdout is set to 1 (#1531862). cmd = r"import sys, os; sys.exit(os.write(sys.stdout.fileno(), b'.\n'))" rc = subprocess.call([sys.executable, "-c", cmd], stdout=1) self.assertEqual(rc, 2) def test_cwd(self): tmpdir = tempfile.gettempdir() # We cannot use os.path.realpath to canonicalize the path, # since it doesn't expand Tru64 {memb} strings. See bug 1063571. cwd = os.getcwd() os.chdir(tmpdir) tmpdir = os.getcwd() os.chdir(cwd) p = subprocess.Popen([sys.executable, "-c", 'import sys,os;' 'sys.stdout.write(os.getcwd())'], stdout=subprocess.PIPE, cwd=tmpdir) normcase = os.path.normcase self.assertEqual(normcase(p.stdout.read().decode("utf-8")), normcase(tmpdir)) def test_env(self): newenv = os.environ.copy() newenv["FRUIT"] = "orange" p = subprocess.Popen([sys.executable, "-c", 'import sys,os;' 'sys.stdout.write(os.getenv("FRUIT"))'], stdout=subprocess.PIPE, env=newenv) self.assertEqual(p.stdout.read(), b"orange") def test_communicate_stdin(self): p = subprocess.Popen([sys.executable, "-c", 'import sys;' 'sys.exit(sys.stdin.read() == "pear")'], stdin=subprocess.PIPE) p.communicate(b"pear") self.assertEqual(p.returncode, 1) def test_communicate_stdout(self): p = subprocess.Popen([sys.executable, "-c", 'import sys; sys.stdout.write("pineapple")'], stdout=subprocess.PIPE) (stdout, stderr) = p.communicate() self.assertEqual(stdout, b"pineapple") self.assertEqual(stderr, None) def test_communicate_stderr(self): p = subprocess.Popen([sys.executable, "-c", 'import sys; sys.stderr.write("pineapple")'], stderr=subprocess.PIPE) (stdout, stderr) = p.communicate() self.assertEqual(stdout, None) self.assertStderrEqual(stderr, b"pineapple") def test_communicate(self): p = subprocess.Popen([sys.executable, "-c", 'import sys,os;' 'sys.stderr.write("pineapple");' 'sys.stdout.write(sys.stdin.read())'], stdin=subprocess.PIPE, stdout=subprocess.PIPE, stderr=subprocess.PIPE) (stdout, stderr) = p.communicate(b"banana") self.assertEqual(stdout, b"banana") self.assertStderrEqual(stderr, b"pineapple") # This test is Linux specific for simplicity to at least have # some coverage. It is not a platform specific bug. @unittest.skipUnless(os.path.isdir('/proc/%d/fd' % os.getpid()), "Linux specific") # Test for the fd leak reported in http://bugs.python.org/issue2791. def test_communicate_pipe_fd_leak(self): fd_directory = '/proc/%d/fd' % os.getpid() num_fds_before_popen = len(os.listdir(fd_directory)) p = subprocess.Popen([sys.executable, "-c", "print()"], stdout=subprocess.PIPE) p.communicate() num_fds_after_communicate = len(os.listdir(fd_directory)) del p num_fds_after_destruction = len(os.listdir(fd_directory)) self.assertEqual(num_fds_before_popen, num_fds_after_destruction) self.assertEqual(num_fds_before_popen, num_fds_after_communicate) def test_communicate_returns(self): # communicate() should return None if no redirection is active p = subprocess.Popen([sys.executable, "-c", "import sys; sys.exit(47)"]) (stdout, stderr) = p.communicate() self.assertEqual(stdout, None) self.assertEqual(stderr, None) def test_communicate_pipe_buf(self): # communicate() with writes larger than pipe_buf # This test will probably deadlock rather than fail, if # communicate() does not work properly. x, y = os.pipe() if mswindows: pipe_buf = 512 else: pipe_buf = os.fpathconf(x, "PC_PIPE_BUF") os.close(x) os.close(y) p = subprocess.Popen([sys.executable, "-c", 'import sys,os;' 'sys.stdout.write(sys.stdin.read(47));' 'sys.stderr.write("xyz"*%d);' 'sys.stdout.write(sys.stdin.read())' % pipe_buf], stdin=subprocess.PIPE, stdout=subprocess.PIPE, stderr=subprocess.PIPE) string_to_write = b"abc"*pipe_buf (stdout, stderr) = p.communicate(string_to_write) self.assertEqual(stdout, string_to_write) def test_writes_before_communicate(self): # stdin.write before communicate() p = subprocess.Popen([sys.executable, "-c", 'import sys,os;' 'sys.stdout.write(sys.stdin.read())'], stdin=subprocess.PIPE, stdout=subprocess.PIPE, stderr=subprocess.PIPE) p.stdin.write(b"banana") (stdout, stderr) = p.communicate(b"split") self.assertEqual(stdout, b"bananasplit") self.assertStderrEqual(stderr, b"") def test_universal_newlines(self): p = subprocess.Popen([sys.executable, "-c", 'import sys,os;' + SETBINARY + 'sys.stdout.write("line1\\n");' 'sys.stdout.flush();' 'sys.stdout.write("line2\\n");' 'sys.stdout.flush();' 'sys.stdout.write("line3\\r\\n");' 'sys.stdout.flush();' 'sys.stdout.write("line4\\r");' 'sys.stdout.flush();' 'sys.stdout.write("\\nline5");' 'sys.stdout.flush();' 'sys.stdout.write("\\nline6");'], stdout=subprocess.PIPE, universal_newlines=1) stdout = p.stdout.read() self.assertEqual(stdout, "line1\nline2\nline3\nline4\nline5\nline6") def test_universal_newlines_communicate(self): # universal newlines through communicate() p = subprocess.Popen([sys.executable, "-c", 'import sys,os;' + SETBINARY + 'sys.stdout.write("line1\\n");' 'sys.stdout.flush();' 'sys.stdout.write("line2\\n");' 'sys.stdout.flush();' 'sys.stdout.write("line3\\r\\n");' 'sys.stdout.flush();' 'sys.stdout.write("line4\\r");' 'sys.stdout.flush();' 'sys.stdout.write("\\nline5");' 'sys.stdout.flush();' 'sys.stdout.write("\\nline6");'], stdout=subprocess.PIPE, stderr=subprocess.PIPE, universal_newlines=1) (stdout, stderr) = p.communicate() self.assertEqual(stdout, "line1\nline2\nline3\nline4\nline5\nline6") def test_no_leaking(self): # Make sure we leak no resources if (not hasattr(support, "is_resource_enabled") or support.is_resource_enabled("subprocess") and not mswindows): max_handles = 1026 # too much for most UNIX systems else: max_handles = 65 for i in range(max_handles): p = subprocess.Popen([sys.executable, "-c", "import sys;" "sys.stdout.write(sys.stdin.read())"], stdin=subprocess.PIPE, stdout=subprocess.PIPE, stderr=subprocess.PIPE) data = p.communicate(b"lime")[0] self.assertEqual(data, b"lime") def test_list2cmdline(self): self.assertEqual(subprocess.list2cmdline(['a b c', 'd', 'e']), '"a b c" d e') self.assertEqual(subprocess.list2cmdline(['ab"c', '\\', 'd']), 'ab\\"c \\ d') self.assertEqual(subprocess.list2cmdline(['ab"c', ' \\', 'd']), 'ab\\"c " \\\\" d') self.assertEqual(subprocess.list2cmdline(['a\\\\\\b', 'de fg', 'h']), 'a\\\\\\b "de fg" h') self.assertEqual(subprocess.list2cmdline(['a\\"b', 'c', 'd']), 'a\\\\\\"b c d') self.assertEqual(subprocess.list2cmdline(['a\\\\b c', 'd', 'e']), '"a\\\\b c" d e') self.assertEqual(subprocess.list2cmdline(['a\\\\b\\ c', 'd', 'e']), '"a\\\\b\\ c" d e') self.assertEqual(subprocess.list2cmdline(['ab', '']), 'ab ""') self.assertEqual(subprocess.list2cmdline(['echo', 'foo|bar']), 'echo "foo|bar"') def test_poll(self): p = subprocess.Popen([sys.executable, "-c", "import time; time.sleep(1)"]) count = 0 while p.poll() is None: time.sleep(0.1) count += 1 # We expect that the poll loop probably went around about 10 times, # but, based on system scheduling we can't control, it's possible # poll() never returned None. It "should be" very rare that it # didn't go around at least twice. self.assertGreaterEqual(count, 2) # Subsequent invocations should just return the returncode self.assertEqual(p.poll(), 0) def test_wait(self): p = subprocess.Popen([sys.executable, "-c", "import time; time.sleep(2)"]) self.assertEqual(p.wait(), 0) # Subsequent invocations should just return the returncode self.assertEqual(p.wait(), 0) def test_invalid_bufsize(self): # an invalid type of the bufsize argument should raise # TypeError. with self.assertRaises(TypeError): subprocess.Popen([sys.executable, "-c", "pass"], "orange") def test_bufsize_is_none(self): # bufsize=None should be the same as bufsize=0. p = subprocess.Popen([sys.executable, "-c", "pass"], None) self.assertEqual(p.wait(), 0) # Again with keyword arg p = subprocess.Popen([sys.executable, "-c", "pass"], bufsize=None) self.assertEqual(p.wait(), 0) def test_leaking_fds_on_error(self): # see bug #5179: Popen leaks file descriptors to PIPEs if # the child fails to execute; this will eventually exhaust # the maximum number of open fds. 1024 seems a very common # value for that limit, but Windows has 2048, so we loop # 1024 times (each call leaked two fds). for i in range(1024): # Windows raises IOError. Others raise OSError. with self.assertRaises(EnvironmentError) as c: subprocess.Popen(['nonexisting_i_hope'], stdout=subprocess.PIPE, stderr=subprocess.PIPE) if c.exception.errno != 2: # ignore "no such file" raise c.exception # context manager class _SuppressCoreFiles(object): """Try to prevent core files from being created.""" old_limit = None def __enter__(self): """Try to save previous ulimit, then set it to (0, 0).""" try: import resource self.old_limit = resource.getrlimit(resource.RLIMIT_CORE) resource.setrlimit(resource.RLIMIT_CORE, (0, 0)) except (ImportError, ValueError, resource.error): pass def __exit__(self, *args): """Return core file behavior to default.""" if self.old_limit is None: return try: import resource resource.setrlimit(resource.RLIMIT_CORE, self.old_limit) except (ImportError, ValueError, resource.error): pass @unittest.skipIf(mswindows, "POSIX specific tests") class POSIXProcessTestCase(BaseTestCase): def test_exceptions(self): nonexistent_dir = "/_this/pa.th/does/not/exist" try: os.chdir(nonexistent_dir) except OSError as e: # This avoids hard coding the errno value or the OS perror() # string and instead capture the exception that we want to see # below for comparison. desired_exception = e else: self.fail("chdir to nonexistant directory %s succeeded." % nonexistent_dir) # Error in the child re-raised in the parent. try: p = subprocess.Popen([sys.executable, "-c", ""], cwd=nonexistent_dir) except OSError as e: # Test that the child process chdir failure actually makes # it up to the parent process as the correct exception. self.assertEqual(desired_exception.errno, e.errno) self.assertEqual(desired_exception.strerror, e.strerror) else: self.fail("Expected OSError: %s" % desired_exception) def test_restore_signals(self): # Code coverage for both values of restore_signals to make sure it # at least does not blow up. # A test for behavior would be complex. Contributions welcome. subprocess.call([sys.executable, "-c", ""], restore_signals=True) subprocess.call([sys.executable, "-c", ""], restore_signals=False) def test_start_new_session(self): # For code coverage of calling setsid(). We don't care if we get an # EPERM error from it depending on the test execution environment, that # still indicates that it was called. try: output = subprocess.check_output( [sys.executable, "-c", "import os; print(os.getpgid(os.getpid()))"], start_new_session=True) except OSError as e: if e.errno != errno.EPERM: raise else: parent_pgid = os.getpgid(os.getpid()) child_pgid = int(output) self.assertNotEqual(parent_pgid, child_pgid) def test_run_abort(self): # returncode handles signal termination with _SuppressCoreFiles(): p = subprocess.Popen([sys.executable, "-c", 'import os; os.abort()']) p.wait() self.assertEqual(-p.returncode, signal.SIGABRT) def test_preexec(self): # DISCLAIMER: Setting environment variables is *not* a good use # of a preexec_fn. This is merely a test. p = subprocess.Popen([sys.executable, "-c", 'import sys,os;' 'sys.stdout.write(os.getenv("FRUIT"))'], stdout=subprocess.PIPE, preexec_fn=lambda: os.putenv("FRUIT", "apple")) self.assertEqual(p.stdout.read(), b"apple") def test_preexec_exception(self): def raise_it(): raise ValueError("What if two swallows carried a coconut?") try: p = subprocess.Popen([sys.executable, "-c", ""], preexec_fn=raise_it) except RuntimeError as e: self.assertTrue( subprocess._posixsubprocess, "Expected a ValueError from the preexec_fn") except ValueError as e: self.assertIn("coconut", e.args[0]) else: self.fail("Exception raised by preexec_fn did not make it " "to the parent process.") @unittest.skipUnless(gc, "Requires a gc module.") def test_preexec_gc_module_failure(self): # This tests the code that disables garbage collection if the child # process will execute any Python. def raise_runtime_error(): raise RuntimeError("this shouldn't escape") enabled = gc.isenabled() orig_gc_disable = gc.disable orig_gc_isenabled = gc.isenabled try: gc.disable() self.assertFalse(gc.isenabled()) subprocess.call([sys.executable, '-c', ''], preexec_fn=lambda: None) self.assertFalse(gc.isenabled(), "Popen enabled gc when it shouldn't.") gc.enable() self.assertTrue(gc.isenabled()) subprocess.call([sys.executable, '-c', ''], preexec_fn=lambda: None) self.assertTrue(gc.isenabled(), "Popen left gc disabled.") gc.disable = raise_runtime_error self.assertRaises(RuntimeError, subprocess.Popen, [sys.executable, '-c', ''], preexec_fn=lambda: None) del gc.isenabled # force an AttributeError self.assertRaises(AttributeError, subprocess.Popen, [sys.executable, '-c', ''], preexec_fn=lambda: None) finally: gc.disable = orig_gc_disable gc.isenabled = orig_gc_isenabled if not enabled: gc.disable() def test_args_string(self): # args is a string fd, fname = mkstemp() # reopen in text mode with open(fd, "w") as fobj: fobj.write("#!/bin/sh\n") fobj.write("exec '%s' -c 'import sys; sys.exit(47)'\n" % sys.executable) os.chmod(fname, 0o700) p = subprocess.Popen(fname) p.wait() os.remove(fname) self.assertEqual(p.returncode, 47) def test_invalid_args(self): # invalid arguments should raise ValueError self.assertRaises(ValueError, subprocess.call, [sys.executable, "-c", "import sys; sys.exit(47)"], startupinfo=47) self.assertRaises(ValueError, subprocess.call, [sys.executable, "-c", "import sys; sys.exit(47)"], creationflags=47) def test_shell_sequence(self): # Run command through the shell (sequence) newenv = os.environ.copy() newenv["FRUIT"] = "apple" p = subprocess.Popen(["echo $FRUIT"], shell=1, stdout=subprocess.PIPE, env=newenv) self.assertEqual(p.stdout.read().strip(b" \t\r\n\f"), b"apple") def test_shell_string(self): # Run command through the shell (string) newenv = os.environ.copy() newenv["FRUIT"] = "apple" p = subprocess.Popen("echo $FRUIT", shell=1, stdout=subprocess.PIPE, env=newenv) self.assertEqual(p.stdout.read().strip(b" \t\r\n\f"), b"apple") def test_call_string(self): # call() function with string argument on UNIX fd, fname = mkstemp() # reopen in text mode with open(fd, "w") as fobj: fobj.write("#!/bin/sh\n") fobj.write("exec '%s' -c 'import sys; sys.exit(47)'\n" % sys.executable) os.chmod(fname, 0o700) rc = subprocess.call(fname) os.remove(fname) self.assertEqual(rc, 47) def _kill_process(self, method, *args): # Do not inherit file handles from the parent. # It should fix failures on some platforms. p = subprocess.Popen([sys.executable, "-c", "input()"], close_fds=True, stdin=subprocess.PIPE, stderr=subprocess.PIPE) # Let the process initialize (Issue #3137) time.sleep(0.1) # The process should not terminate prematurely self.assertIsNone(p.poll()) # Retry if the process do not receive the signal. count, maxcount = 0, 3 while count < maxcount and p.poll() is None: getattr(p, method)(*args) time.sleep(0.1) count += 1 self.assertIsNotNone(p.poll(), "the subprocess did not terminate") if count > 1: print("p.{}{} succeeded after " "{} attempts".format(method, args, count), file=sys.stderr) return p def test_send_signal(self): p = self._kill_process('send_signal', signal.SIGINT) _, stderr = p.communicate() self.assertIn(b'KeyboardInterrupt', stderr) self.assertNotEqual(p.wait(), 0) def test_kill(self): p = self._kill_process('kill') _, stderr = p.communicate() self.assertStderrEqual(stderr, b'') self.assertEqual(p.wait(), -signal.SIGKILL) def test_terminate(self): p = self._kill_process('terminate') _, stderr = p.communicate() self.assertStderrEqual(stderr, b'') self.assertEqual(p.wait(), -signal.SIGTERM) def test_surrogates_error_message(self): def prepare(): raise ValueError("surrogate:\uDCff") try: subprocess.call( [sys.executable, "-c", "pass"], preexec_fn=prepare) except ValueError as err: # Pure Python implementations keeps the message self.assertIsNone(subprocess._posixsubprocess) self.assertEqual(str(err), "surrogate:\uDCff") except RuntimeError as err: # _posixsubprocess uses a default message self.assertIsNotNone(subprocess._posixsubprocess) self.assertEqual(str(err), "Exception occurred in preexec_fn.") else: self.fail("Expected ValueError or RuntimeError") def test_undecodable_env(self): for key, value in (('test', 'abc\uDCFF'), ('test\uDCFF', '42')): # test str with surrogates script = "import os; print(repr(os.getenv(%s)))" % repr(key) env = os.environ.copy() env[key] = value stdout = subprocess.check_output( [sys.executable, "-c", script], env=env) stdout = stdout.rstrip(b'\n\r') self.assertEquals(stdout.decode('ascii'), repr(value)) # test bytes key = key.encode("ascii", "surrogateescape") value = value.encode("ascii", "surrogateescape") script = "import os; print(repr(os.getenvb(%s)))" % repr(key) env = os.environ.copy() env[key] = value stdout = subprocess.check_output( [sys.executable, "-c", script], env=env) stdout = stdout.rstrip(b'\n\r') self.assertEquals(stdout.decode('ascii'), repr(value)) @unittest.skipUnless(mswindows, "Windows specific tests") class Win32ProcessTestCase(BaseTestCase): def test_startupinfo(self): # startupinfo argument # We uses hardcoded constants, because we do not want to # depend on win32all. STARTF_USESHOWWINDOW = 1 SW_MAXIMIZE = 3 startupinfo = subprocess.STARTUPINFO() startupinfo.dwFlags = STARTF_USESHOWWINDOW startupinfo.wShowWindow = SW_MAXIMIZE # Since Python is a console process, it won't be affected # by wShowWindow, but the argument should be silently # ignored subprocess.call([sys.executable, "-c", "import sys; sys.exit(0)"], startupinfo=startupinfo) def test_creationflags(self): # creationflags argument CREATE_NEW_CONSOLE = 16 sys.stderr.write(" a DOS box should flash briefly ...\n") subprocess.call(sys.executable + ' -c "import time; time.sleep(0.25)"', creationflags=CREATE_NEW_CONSOLE) def test_invalid_args(self): # invalid arguments should raise ValueError self.assertRaises(ValueError, subprocess.call, [sys.executable, "-c", "import sys; sys.exit(47)"], preexec_fn=lambda: 1) self.assertRaises(ValueError, subprocess.call, [sys.executable, "-c", "import sys; sys.exit(47)"], stdout=subprocess.PIPE, close_fds=True) def test_close_fds(self): # close file descriptors rc = subprocess.call([sys.executable, "-c", "import sys; sys.exit(47)"], close_fds=True) self.assertEqual(rc, 47) def test_shell_sequence(self): # Run command through the shell (sequence) newenv = os.environ.copy() newenv["FRUIT"] = "physalis" p = subprocess.Popen(["set"], shell=1, stdout=subprocess.PIPE, env=newenv) self.assertIn(b"physalis", p.stdout.read()) def test_shell_string(self): # Run command through the shell (string) newenv = os.environ.copy() newenv["FRUIT"] = "physalis" p = subprocess.Popen("set", shell=1, stdout=subprocess.PIPE, env=newenv) self.assertIn(b"physalis", p.stdout.read()) def test_call_string(self): # call() function with string argument on Windows rc = subprocess.call(sys.executable + ' -c "import sys; sys.exit(47)"') self.assertEqual(rc, 47) def _kill_process(self, method, *args): # Some win32 buildbot raises EOFError if stdin is inherited p = subprocess.Popen([sys.executable, "-c", "input()"], stdin=subprocess.PIPE, stderr=subprocess.PIPE) # Let the process initialize (Issue #3137) time.sleep(0.1) # The process should not terminate prematurely self.assertIsNone(p.poll()) # Retry if the process do not receive the signal. count, maxcount = 0, 3 while count < maxcount and p.poll() is None: getattr(p, method)(*args) time.sleep(0.1) count += 1 returncode = p.poll() self.assertIsNotNone(returncode, "the subprocess did not terminate") if count > 1: print("p.{}{} succeeded after " "{} attempts".format(method, args, count), file=sys.stderr) _, stderr = p.communicate() self.assertStderrEqual(stderr, b'') self.assertEqual(p.wait(), returncode) self.assertNotEqual(returncode, 0) def test_send_signal(self): self._kill_process('send_signal', signal.SIGTERM) def test_kill(self): self._kill_process('kill') def test_terminate(self): self._kill_process('terminate') # The module says: # "NB This only works (and is only relevant) for UNIX." # # Actually, getoutput should work on any platform with an os.popen, but # I'll take the comment as given, and skip this suite. @unittest.skipUnless(os.name == 'posix', "only relevant for UNIX") class CommandTests(unittest.TestCase): def test_getoutput(self): self.assertEqual(subprocess.getoutput('echo xyzzy'), 'xyzzy') self.assertEqual(subprocess.getstatusoutput('echo xyzzy'), (0, 'xyzzy')) # we use mkdtemp in the next line to create an empty directory # under our exclusive control; from that, we can invent a pathname # that we _know_ won't exist. This is guaranteed to fail. dir = None try: dir = tempfile.mkdtemp() name = os.path.join(dir, "foo") status, output = subprocess.getstatusoutput('cat ' + name) self.assertNotEqual(status, 0) finally: if dir is not None: os.rmdir(dir) @unittest.skipUnless(getattr(subprocess, '_has_poll', False), "poll system call not supported") class ProcessTestCaseNoPoll(ProcessTestCase): def setUp(self): subprocess._has_poll = False ProcessTestCase.setUp(self) def tearDown(self): subprocess._has_poll = True ProcessTestCase.tearDown(self) @unittest.skipUnless(getattr(subprocess, '_posixsubprocess', False), "_posixsubprocess extension module not found.") class ProcessTestCasePOSIXPurePython(ProcessTestCase, POSIXProcessTestCase): def setUp(self): subprocess._posixsubprocess = None ProcessTestCase.setUp(self) POSIXProcessTestCase.setUp(self) def tearDown(self): subprocess._posixsubprocess = sys.modules['_posixsubprocess'] POSIXProcessTestCase.tearDown(self) ProcessTestCase.tearDown(self) class HelperFunctionTests(unittest.TestCase): @unittest.skipIf(mswindows, "errno and EINTR make no sense on windows") def test_eintr_retry_call(self): record_calls = [] def fake_os_func(*args): record_calls.append(args) if len(record_calls) == 2: raise OSError(errno.EINTR, "fake interrupted system call") return tuple(reversed(args)) self.assertEqual((999, 256), subprocess._eintr_retry_call(fake_os_func, 256, 999)) self.assertEqual([(256, 999)], record_calls) # This time there will be an EINTR so it will loop once. self.assertEqual((666,), subprocess._eintr_retry_call(fake_os_func, 666)) self.assertEqual([(256, 999), (666,), (666,)], record_calls) def test_main(): unit_tests = (ProcessTestCase, POSIXProcessTestCase, Win32ProcessTestCase, ProcessTestCasePOSIXPurePython, CommandTests, ProcessTestCaseNoPoll, HelperFunctionTests) support.run_unittest(*unit_tests) support.reap_children() if __name__ == "__main__": test_main()