import unittest from test import test_support import subprocess import sys import signal import os import errno import tempfile import time import re 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 = '' # 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. def remove_stderr_debug_decorations(stderr): return re.sub(r"\[\d+ refs\]\r?\n?$", "", stderr) class ProcessTestCase(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). if hasattr(test_support, "reap_children"): test_support.reap_children() def tearDown(self): # Try to minimize the number of children we have so this test # doesn't crash on some buildbots (Alphas in particular). if hasattr(test_support, "reap_children"): test_support.reap_children() def mkstemp(self): """wrapper for mkstemp, calling mktemp if mkstemp is not available""" if hasattr(tempfile, "mkstemp"): return tempfile.mkstemp() else: fname = tempfile.mktemp() return os.open(fname, os.O_RDWR|os.O_CREAT), fname # # Generic tests # 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 try: subprocess.check_call([sys.executable, "-c", "import sys; sys.exit(47)"]) except subprocess.CalledProcessError, e: self.assertEqual(e.returncode, 47) else: self.fail("Expected CalledProcessError") 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(self): 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("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, "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("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(), "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), "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(), "orange") def test_stderr_pipe(self): # stderr redirection p = subprocess.Popen([sys.executable, "-c", 'import sys; sys.stderr.write("strawberry")'], stderr=subprocess.PIPE) self.assertEqual(remove_stderr_debug_decorations(p.stderr.read()), "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.assertEqual(remove_stderr_debug_decorations(os.read(d, 1024)), "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.assertEqual(remove_stderr_debug_decorations(tf.read()), "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) output = p.stdout.read() stripped = remove_stderr_debug_decorations(output) self.assertEqual(stripped, "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) output = tf.read() stripped = remove_stderr_debug_decorations(output) self.assertEqual(stripped, "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(), '.\n'))" rc = subprocess.call([sys.executable, "-c", cmd], stdout=1) self.assertEquals(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()), 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(), "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("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, "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.assertEqual(remove_stderr_debug_decorations(stderr), "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("banana") self.assertEqual(stdout, "banana") self.assertEqual(remove_stderr_debug_decorations(stderr), "pineapple") # This test is Linux specific for simplicity to at least have # some coverage. It is not a platform specific bug. if os.path.isdir('/proc/%d/fd' % os.getpid()): # 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 = "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("banana") (stdout, stderr) = p.communicate("split") self.assertEqual(stdout, "bananasplit") self.assertEqual(remove_stderr_debug_decorations(stderr), "") 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\\r");' '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() if hasattr(file, 'newlines'): # Interpreter with universal newline support self.assertEqual(stdout, "line1\nline2\nline3\nline4\nline5\nline6") else: # Interpreter without universal newline support self.assertEqual(stdout, "line1\nline2\rline3\r\nline4\r\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\\r");' '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() if hasattr(file, 'newlines'): # Interpreter with universal newline support self.assertEqual(stdout, "line1\nline2\nline3\nline4\nline5\nline6") else: # Interpreter without universal newline support self.assertEqual(stdout, "line1\nline2\rline3\r\nline4\r\nline5\nline6") def test_no_leaking(self): # Make sure we leak no resources if not hasattr(test_support, "is_resource_enabled") \ or test_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("lime")[0] self.assertEqual(data, "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.assert_(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. try: subprocess.Popen([sys.executable, "-c", "pass"], "orange") except TypeError: pass else: self.fail("Expected TypeError") 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): try: subprocess.Popen(['nonexisting_i_hope'], stdout=subprocess.PIPE, stderr=subprocess.PIPE) # Windows raises IOError except (IOError, OSError), err: if err.errno != 2: # ignore "no such file" raise # # POSIX tests # if not mswindows: def test_exceptions(self): # catched & re-raised exceptions try: p = subprocess.Popen([sys.executable, "-c", ""], cwd="/this/path/does/not/exist") except OSError, e: # The attribute child_traceback should contain "os.chdir" # somewhere. self.assertNotEqual(e.child_traceback.find("os.chdir"), -1) else: self.fail("Expected OSError") def _suppress_core_files(self): """Try to prevent core files from being created. Returns previous ulimit if successful, else None. """ try: import resource old_limit = resource.getrlimit(resource.RLIMIT_CORE) resource.setrlimit(resource.RLIMIT_CORE, (0,0)) return old_limit except (ImportError, ValueError, resource.error): return None def _unsuppress_core_files(self, old_limit): """Return core file behavior to default.""" if old_limit is None: return try: import resource resource.setrlimit(resource.RLIMIT_CORE, old_limit) except (ImportError, ValueError, resource.error): return def test_run_abort(self): # returncode handles signal termination old_limit = self._suppress_core_files() try: p = subprocess.Popen([sys.executable, "-c", "import os; os.abort()"]) finally: self._unsuppress_core_files(old_limit) p.wait() self.assertEqual(-p.returncode, signal.SIGABRT) def test_preexec(self): # preexec function 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(), "apple") def test_args_string(self): # args is a string f, fname = self.mkstemp() os.write(f, "#!/bin/sh\n") os.write(f, "exec '%s' -c 'import sys; sys.exit(47)'\n" % sys.executable) os.close(f) os.chmod(fname, 0700) 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(), "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(), "apple") def test_call_string(self): # call() function with string argument on UNIX f, fname = self.mkstemp() os.write(f, "#!/bin/sh\n") os.write(f, "exec '%s' -c 'import sys; sys.exit(47)'\n" % sys.executable) os.close(f) os.chmod(fname, 0700) rc = subprocess.call(fname) os.remove(fname) self.assertEqual(rc, 47) def DISABLED_test_send_signal(self): p = subprocess.Popen([sys.executable, "-c", "input()"]) self.assert_(p.poll() is None, p.poll()) p.send_signal(signal.SIGINT) self.assertNotEqual(p.wait(), 0) def DISABLED_test_kill(self): p = subprocess.Popen([sys.executable, "-c", "input()"]) self.assert_(p.poll() is None, p.poll()) p.kill() self.assertEqual(p.wait(), -signal.SIGKILL) def DISABLED_test_terminate(self): p = subprocess.Popen([sys.executable, "-c", "input()"]) self.assert_(p.poll() is None, p.poll()) p.terminate() self.assertEqual(p.wait(), -signal.SIGTERM) # # Windows tests # if mswindows: 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.assertNotEqual(p.stdout.read().find("physalis"), -1) 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.assertNotEqual(p.stdout.read().find("physalis"), -1) 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 DISABLED_test_send_signal(self): p = subprocess.Popen([sys.executable, "-c", "input()"]) self.assert_(p.poll() is None, p.poll()) p.send_signal(signal.SIGTERM) self.assertNotEqual(p.wait(), 0) def DISABLED_test_kill(self): p = subprocess.Popen([sys.executable, "-c", "input()"]) self.assert_(p.poll() is None, p.poll()) p.kill() self.assertNotEqual(p.wait(), 0) def DISABLED_test_terminate(self): p = subprocess.Popen([sys.executable, "-c", "input()"]) self.assert_(p.poll() is None, p.poll()) p.terminate() self.assertNotEqual(p.wait(), 0) class HelperFunctionTests(unittest.TestCase): 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) if not mswindows: test_eintr_retry_call = _test_eintr_retry_call def test_main(): test_support.run_unittest(ProcessTestCase, HelperFunctionTests) if hasattr(test_support, "reap_children"): test_support.reap_children() if __name__ == "__main__": test_main()