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4304 lines (3798 loc) · 180 KB
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import unittest
from unittest import mock
from test import support
from test.support import check_sanitizer
from test.support import import_helper
from test.support import os_helper
from test.support import strace_helper
from test.support import warnings_helper
from test.support.script_helper import assert_python_ok
import subprocess
import sys
import signal
import io
import itertools
import os
import errno
import tempfile
import time
import traceback
import types
import selectors
import sysconfig
import select
import shutil
import socket
import threading
import gc
import textwrap
import json
from test.support.os_helper import FakePath
try:
import _testcapi
except ImportError:
_testcapi = None
try:
import pwd
except ImportError:
pwd = None
try:
import grp
except ImportError:
grp = None
try:
import resource
except ImportError:
resource = None
try:
import fcntl
except:
fcntl = None
if support.PGO:
raise unittest.SkipTest("test is not helpful for PGO")
if not support.has_subprocess_support:
raise unittest.SkipTest("test module requires subprocess")
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 = ''
NONEXISTING_CMD = ('nonexisting_i_hope',)
# Ignore errors that indicate the command was not found
NONEXISTING_ERRORS = (FileNotFoundError, NotADirectoryError, PermissionError)
ZERO_RETURN_CMD = (sys.executable, '-c', 'pass')
def setUpModule():
shell_true = shutil.which('true')
if shell_true is None:
return
if (os.access(shell_true, os.X_OK) and
subprocess.run([shell_true]).returncode == 0):
global ZERO_RETURN_CMD
ZERO_RETURN_CMD = (shell_true,) # Faster than Python startup.
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):
if not mswindows:
# subprocess._active is not used on Windows and is set to None.
for inst in subprocess._active:
inst.wait()
subprocess._cleanup()
self.assertFalse(
subprocess._active, "subprocess._active not empty"
)
self.doCleanups()
support.reap_children()
class PopenTestException(Exception):
pass
class PopenExecuteChildRaises(subprocess.Popen):
"""Popen subclass for testing cleanup of subprocess.PIPE filehandles when
_execute_child fails.
"""
def _execute_child(self, *args, **kwargs):
raise PopenTestException("Forced Exception for Test")
class ProcessTestCase(BaseTestCase):
def test_io_buffered_by_default(self):
p = subprocess.Popen(ZERO_RETURN_CMD,
stdin=subprocess.PIPE, stdout=subprocess.PIPE,
stderr=subprocess.PIPE)
try:
self.assertIsInstance(p.stdin, io.BufferedIOBase)
self.assertIsInstance(p.stdout, io.BufferedIOBase)
self.assertIsInstance(p.stderr, io.BufferedIOBase)
finally:
p.stdin.close()
p.stdout.close()
p.stderr.close()
p.wait()
def test_io_unbuffered_works(self):
p = subprocess.Popen(ZERO_RETURN_CMD,
stdin=subprocess.PIPE, stdout=subprocess.PIPE,
stderr=subprocess.PIPE, bufsize=0)
try:
self.assertIsInstance(p.stdin, io.RawIOBase)
self.assertIsInstance(p.stdout, io.RawIOBase)
self.assertIsInstance(p.stderr, io.RawIOBase)
finally:
p.stdin.close()
p.stdout.close()
p.stderr.close()
p.wait()
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_call_timeout(self):
# call() function with timeout argument; we want to test that the child
# process gets killed when the timeout expires. If the child isn't
# killed, this call will deadlock since subprocess.call waits for the
# child.
self.assertRaises(subprocess.TimeoutExpired, subprocess.call,
[sys.executable, "-c", "while True: pass"],
timeout=0.1)
def test_timeout_exception(self):
try:
subprocess.run([sys.executable, '-c', 'import time;time.sleep(9)'], timeout = -1)
except subprocess.TimeoutExpired as e:
self.assertIn("-1 seconds", str(e))
else:
self.fail("Expected TimeoutExpired exception not raised")
try:
subprocess.run([sys.executable, '-c', 'import time;time.sleep(9)'], timeout = 0)
except subprocess.TimeoutExpired as e:
self.assertIn("0 seconds", str(e))
else:
self.fail("Expected TimeoutExpired exception not raised")
def test_check_call_zero(self):
# check_call() function with zero return code
rc = subprocess.check_call(ZERO_RETURN_CMD)
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)
with self.assertRaisesRegex(ValueError,
"stdout argument not allowed, it will be overridden"):
subprocess.check_output([], stdout=None)
with self.assertRaisesRegex(ValueError,
"check argument not allowed, it will be overridden"):
subprocess.check_output([], check=False)
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_stdin_arg(self):
# check_output() can be called with stdin set to a file
tf = tempfile.TemporaryFile()
self.addCleanup(tf.close)
tf.write(b'pear')
tf.seek(0)
output = subprocess.check_output(
[sys.executable, "-c",
"import sys; sys.stdout.write(sys.stdin.read().upper())"],
stdin=tf)
self.assertIn(b'PEAR', output)
def test_check_output_input_arg(self):
# check_output() can be called with input set to a string
output = subprocess.check_output(
[sys.executable, "-c",
"import sys; sys.stdout.write(sys.stdin.read().upper())"],
input=b'pear')
self.assertIn(b'PEAR', output)
def test_check_output_input_none(self):
"""input=None has a legacy meaning of input='' on check_output."""
output = subprocess.check_output(
[sys.executable, "-c",
"import sys; print('XX' if sys.stdin.read() else '')"],
input=None)
self.assertNotIn(b'XX', output)
def test_check_output_input_none_text(self):
output = subprocess.check_output(
[sys.executable, "-c",
"import sys; print('XX' if sys.stdin.read() else '')"],
input=None, text=True)
self.assertNotIn('XX', output)
def test_check_output_input_none_universal_newlines(self):
output = subprocess.check_output(
[sys.executable, "-c",
"import sys; print('XX' if sys.stdin.read() else '')"],
input=None, universal_newlines=True)
self.assertNotIn('XX', output)
def test_check_output_input_none_encoding_errors(self):
output = subprocess.check_output(
[sys.executable, "-c", "print('foo')"],
input=None, encoding='utf-8', errors='ignore')
self.assertIn('foo', output)
def test_check_output_stdout_arg(self):
# check_output() refuses to accept 'stdout' argument
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_check_output_stdin_with_input_arg(self):
# check_output() refuses to accept 'stdin' with 'input'
tf = tempfile.TemporaryFile()
self.addCleanup(tf.close)
tf.write(b'pear')
tf.seek(0)
with self.assertRaises(ValueError) as c:
output = subprocess.check_output(
[sys.executable, "-c", "print('will not be run')"],
stdin=tf, input=b'hare')
self.fail("Expected ValueError when stdin and input args supplied.")
self.assertIn('stdin', c.exception.args[0])
self.assertIn('input', c.exception.args[0])
def test_check_output_timeout(self):
# check_output() function with timeout arg
with self.assertRaises(subprocess.TimeoutExpired) as c:
output = subprocess.check_output(
[sys.executable, "-c",
"import time; time.sleep(3600)"],
timeout=0.1)
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_invalid_args(self):
# Popen() called with invalid arguments should raise TypeError
# but Popen.__del__ should not complain (issue #12085)
with support.captured_stderr() as s:
self.assertRaises(TypeError, subprocess.Popen, invalid_arg_name=1)
argcount = subprocess.Popen.__init__.__code__.co_argcount
too_many_args = [0] * (argcount + 1)
self.assertRaises(TypeError, subprocess.Popen, *too_many_args)
self.assertEqual(s.getvalue(), '')
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)
self.addCleanup(p.stdout.close)
self.addCleanup(p.stderr.close)
p.wait()
self.assertEqual(p.stdin, None)
def test_stdout_none(self):
# .stdout is None when not redirected, and the child's stdout will
# be inherited from the parent. In order to test this we run a
# subprocess in a subprocess:
# this_test
# \-- subprocess created by this test (parent)
# \-- subprocess created by the parent subprocess (child)
# The parent doesn't specify stdout, so the child will use the
# parent's stdout. This test checks that the message printed by the
# child goes to the parent stdout. The parent also checks that the
# child's stdout is None. See #11963.
code = ('import sys; from subprocess import Popen, PIPE;'
'p = Popen([sys.executable, "-c", "print(\'test_stdout_none\')"],'
' stdin=PIPE, stderr=PIPE);'
'p.wait(); assert p.stdout is None;')
p = subprocess.Popen([sys.executable, "-c", code],
stdout=subprocess.PIPE, stderr=subprocess.PIPE)
self.addCleanup(p.stdout.close)
self.addCleanup(p.stderr.close)
out, err = p.communicate()
self.assertEqual(p.returncode, 0, err)
self.assertEqual(out.rstrip(), b'test_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)
self.addCleanup(p.stdout.close)
self.addCleanup(p.stdin.close)
p.wait()
self.assertEqual(p.stderr, None)
def _assert_python(self, pre_args, **kwargs):
# We include sys.exit() to prevent the test runner from hanging
# whenever python is found.
args = pre_args + ["import sys; sys.exit(47)"]
p = subprocess.Popen(args, **kwargs)
p.wait()
self.assertEqual(47, p.returncode)
def test_executable(self):
# Check that the executable argument works.
#
# On Unix (non-Mac and non-Windows), Python looks at args[0] to
# determine where its standard library is, so we need the directory
# of args[0] to be valid for the Popen() call to Python to succeed.
# See also issue #16170 and issue #7774.
doesnotexist = os.path.join(os.path.dirname(sys.executable),
"doesnotexist")
self._assert_python([doesnotexist, "-c"], executable=sys.executable)
def test_bytes_executable(self):
doesnotexist = os.path.join(os.path.dirname(sys.executable),
"doesnotexist")
self._assert_python([doesnotexist, "-c"],
executable=os.fsencode(sys.executable))
def test_pathlike_executable(self):
doesnotexist = os.path.join(os.path.dirname(sys.executable),
"doesnotexist")
self._assert_python([doesnotexist, "-c"],
executable=FakePath(sys.executable))
def test_executable_takes_precedence(self):
# Check that the executable argument takes precedence over args[0].
#
# Verify first that the call succeeds without the executable arg.
pre_args = [sys.executable, "-c"]
self._assert_python(pre_args)
self.assertRaises(NONEXISTING_ERRORS,
self._assert_python, pre_args,
executable=NONEXISTING_CMD[0])
@unittest.skipIf(mswindows, "executable argument replaces shell")
def test_executable_replaces_shell(self):
# Check that the executable argument replaces the default shell
# when shell=True.
self._assert_python([], executable=sys.executable, shell=True)
@unittest.skipIf(mswindows, "executable argument replaces shell")
def test_bytes_executable_replaces_shell(self):
self._assert_python([], executable=os.fsencode(sys.executable),
shell=True)
@unittest.skipIf(mswindows, "executable argument replaces shell")
def test_pathlike_executable_replaces_shell(self):
self._assert_python([], executable=FakePath(sys.executable),
shell=True)
# For use in the test_cwd* tests below.
def _normalize_cwd(self, cwd):
# Normalize an expected cwd (for Tru64 support).
# We can't use os.path.realpath since it doesn't expand Tru64 {memb}
# strings. See bug #1063571.
with os_helper.change_cwd(cwd):
return os.getcwd()
# For use in the test_cwd* tests below.
def _split_python_path(self):
# Return normalized (python_dir, python_base).
python_path = os.path.realpath(sys.executable)
return os.path.split(python_path)
# For use in the test_cwd* tests below.
def _assert_cwd(self, expected_cwd, python_arg, **kwargs):
# Invoke Python via Popen, and assert that (1) the call succeeds,
# and that (2) the current working directory of the child process
# matches *expected_cwd*.
p = subprocess.Popen([python_arg, "-c",
"import os, sys; "
"buf = sys.stdout.buffer; "
"buf.write(os.getcwd().encode()); "
"buf.flush(); "
"sys.exit(47)"],
stdout=subprocess.PIPE,
**kwargs)
self.addCleanup(p.stdout.close)
p.wait()
self.assertEqual(47, p.returncode)
normcase = os.path.normcase
self.assertEqual(normcase(expected_cwd),
normcase(p.stdout.read().decode()))
def test_cwd(self):
# Check that cwd changes the cwd for the child process.
temp_dir = tempfile.gettempdir()
temp_dir = self._normalize_cwd(temp_dir)
self._assert_cwd(temp_dir, sys.executable, cwd=temp_dir)
def test_cwd_with_bytes(self):
temp_dir = tempfile.gettempdir()
temp_dir = self._normalize_cwd(temp_dir)
self._assert_cwd(temp_dir, sys.executable, cwd=os.fsencode(temp_dir))
def test_cwd_with_pathlike(self):
temp_dir = tempfile.gettempdir()
temp_dir = self._normalize_cwd(temp_dir)
self._assert_cwd(temp_dir, sys.executable, cwd=FakePath(temp_dir))
@unittest.skipIf(mswindows, "pending resolution of issue #15533")
def test_cwd_with_relative_arg(self):
# Check that Popen looks for args[0] relative to cwd if args[0]
# is relative.
python_dir, python_base = self._split_python_path()
rel_python = os.path.join(os.curdir, python_base)
with os_helper.temp_cwd() as wrong_dir:
# Before calling with the correct cwd, confirm that the call fails
# without cwd and with the wrong cwd.
self.assertRaises(FileNotFoundError, subprocess.Popen,
[rel_python])
self.assertRaises(FileNotFoundError, subprocess.Popen,
[rel_python], cwd=wrong_dir)
python_dir = self._normalize_cwd(python_dir)
self._assert_cwd(python_dir, rel_python, cwd=python_dir)
@unittest.skipIf(mswindows, "pending resolution of issue #15533")
def test_cwd_with_relative_executable(self):
# Check that Popen looks for executable relative to cwd if executable
# is relative (and that executable takes precedence over args[0]).
python_dir, python_base = self._split_python_path()
rel_python = os.path.join(os.curdir, python_base)
doesntexist = "somethingyoudonthave"
with os_helper.temp_cwd() as wrong_dir:
# Before calling with the correct cwd, confirm that the call fails
# without cwd and with the wrong cwd.
self.assertRaises(FileNotFoundError, subprocess.Popen,
[doesntexist], executable=rel_python)
self.assertRaises(FileNotFoundError, subprocess.Popen,
[doesntexist], executable=rel_python,
cwd=wrong_dir)
python_dir = self._normalize_cwd(python_dir)
self._assert_cwd(python_dir, doesntexist, executable=rel_python,
cwd=python_dir)
def test_cwd_with_absolute_arg(self):
# Check that Popen can find the executable when the cwd is wrong
# if args[0] is an absolute path.
python_dir, python_base = self._split_python_path()
abs_python = os.path.join(python_dir, python_base)
rel_python = os.path.join(os.curdir, python_base)
with os_helper.temp_dir() as wrong_dir:
# Before calling with an absolute path, confirm that using a
# relative path fails.
self.assertRaises(FileNotFoundError, subprocess.Popen,
[rel_python], cwd=wrong_dir)
wrong_dir = self._normalize_cwd(wrong_dir)
self._assert_cwd(wrong_dir, abs_python, cwd=wrong_dir)
@unittest.skipIf(sys.base_prefix != sys.prefix,
'Test is not venv-compatible')
def test_executable_with_cwd(self):
python_dir, python_base = self._split_python_path()
python_dir = self._normalize_cwd(python_dir)
self._assert_cwd(python_dir, "somethingyoudonthave",
executable=sys.executable, cwd=python_dir)
@unittest.skipIf(sys.base_prefix != sys.prefix,
'Test is not venv-compatible')
@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.
self._assert_cwd(os.getcwd(), "somethingyoudonthave",
executable=sys.executable)
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()
self.addCleanup(tf.close)
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()
self.addCleanup(tf.close)
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)
with p:
self.assertEqual(p.stdout.read(), b"orange")
def test_stdout_filedes(self):
# stdout is set to open file descriptor
tf = tempfile.TemporaryFile()
self.addCleanup(tf.close)
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()
self.addCleanup(tf.close)
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)
with p:
self.assertEqual(p.stderr.read(), b"strawberry")
def test_stderr_filedes(self):
# stderr is set to open file descriptor
tf = tempfile.TemporaryFile()
self.addCleanup(tf.close)
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(os.read(d, 1024), b"strawberry")
def test_stderr_fileobj(self):
# stderr is set to open file object
tf = tempfile.TemporaryFile()
self.addCleanup(tf.close)
p = subprocess.Popen([sys.executable, "-c",
'import sys; sys.stderr.write("strawberry")'],
stderr=tf)
p.wait()
tf.seek(0)
self.assertEqual(tf.read(), b"strawberry")
def test_stderr_redirect_with_no_stdout_redirect(self):
# test stderr=STDOUT while stdout=None (not set)
# - grandchild prints to stderr
# - child redirects grandchild's stderr to its stdout
# - the parent should get grandchild's stderr in child's stdout
p = subprocess.Popen([sys.executable, "-c",
'import sys, subprocess;'
'rc = subprocess.call([sys.executable, "-c",'
' "import sys;"'
' "sys.stderr.write(\'42\')"],'
' stderr=subprocess.STDOUT);'
'sys.exit(rc)'],
stdout=subprocess.PIPE,
stderr=subprocess.PIPE)
stdout, stderr = p.communicate()
#NOTE: stdout should get stderr from grandchild
self.assertEqual(stdout, b'42')
self.assertEqual(stderr, b'') # should be empty
self.assertEqual(p.returncode, 0)
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)
with p:
self.assertEqual(p.stdout.read(), b"appleorange")
def test_stdout_stderr_file(self):
# capture stdout and stderr to the same open file
tf = tempfile.TemporaryFile()
self.addCleanup(tf.close)
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.assertEqual(tf.read(), b"appleorange")
def test_stdout_filedes_of_stdout(self):
# stdout is set to 1 (#1531862).
# To avoid printing the text on stdout, we do something similar to
# test_stdout_none (see above). The parent subprocess calls the child
# subprocess passing stdout=1, and this test uses stdout=PIPE in
# order to capture and check the output of the parent. See #11963.
code = ('import sys, subprocess; '
'rc = subprocess.call([sys.executable, "-c", '
' "import os, sys; sys.exit(os.write(sys.stdout.fileno(), '
'b\'test with stdout=1\'))"], stdout=1); '
'assert rc == 18')
p = subprocess.Popen([sys.executable, "-c", code],
stdout=subprocess.PIPE, stderr=subprocess.PIPE)
self.addCleanup(p.stdout.close)
self.addCleanup(p.stderr.close)
out, err = p.communicate()
self.assertEqual(p.returncode, 0, err)
self.assertEqual(out.rstrip(), b'test with stdout=1')
def test_stdout_devnull(self):
p = subprocess.Popen([sys.executable, "-c",
'for i in range(10240):'
'print("x" * 1024)'],
stdout=subprocess.DEVNULL)
p.wait()
self.assertEqual(p.stdout, None)
def test_stderr_devnull(self):
p = subprocess.Popen([sys.executable, "-c",
'import sys\n'
'for i in range(10240):'
'sys.stderr.write("x" * 1024)'],
stderr=subprocess.DEVNULL)
p.wait()
self.assertEqual(p.stderr, None)
def test_stdin_devnull(self):
p = subprocess.Popen([sys.executable, "-c",
'import sys;'
'sys.stdin.read(1)'],
stdin=subprocess.DEVNULL)
p.wait()
self.assertEqual(p.stdin, None)
@unittest.skipUnless(fcntl and hasattr(fcntl, 'F_GETPIPE_SZ'),
'fcntl.F_GETPIPE_SZ required for test.')
def test_pipesizes(self):
test_pipe_r, test_pipe_w = os.pipe()
try:
# Get the default pipesize with F_GETPIPE_SZ
pipesize_default = fcntl.fcntl(test_pipe_w, fcntl.F_GETPIPE_SZ)
finally:
os.close(test_pipe_r)
os.close(test_pipe_w)
pipesize = pipesize_default // 2
pagesize_default = support.get_pagesize()
if pipesize < pagesize_default: # the POSIX minimum
raise unittest.SkipTest(
'default pipesize too small to perform test.')
p = subprocess.Popen(
[sys.executable, "-c",
'import sys; sys.stdin.read(); sys.stdout.write("out"); '
'sys.stderr.write("error!")'],
stdin=subprocess.PIPE, stdout=subprocess.PIPE,
stderr=subprocess.PIPE, pipesize=pipesize)
try:
for fifo in [p.stdin, p.stdout, p.stderr]:
self.assertEqual(
fcntl.fcntl(fifo.fileno(), fcntl.F_GETPIPE_SZ),
pipesize)
# Windows pipe size can be acquired via GetNamedPipeInfoFunction
# https://docs.microsoft.com/en-us/windows/win32/api/namedpipeapi/nf-namedpipeapi-getnamedpipeinfo
# However, this function is not yet in _winapi.
p.stdin.write(b"pear")
p.stdin.close()
p.stdout.close()
p.stderr.close()
finally:
p.kill()
p.wait()
@unittest.skipUnless(fcntl and hasattr(fcntl, 'F_GETPIPE_SZ'),
'fcntl.F_GETPIPE_SZ required for test.')
def test_pipesize_default(self):
proc = subprocess.Popen(
[sys.executable, "-c",
'import sys; sys.stdin.read(); sys.stdout.write("out"); '
'sys.stderr.write("error!")'],
stdin=subprocess.PIPE, stdout=subprocess.PIPE,
stderr=subprocess.PIPE, pipesize=-1)
with proc:
try:
fp_r, fp_w = os.pipe()
try:
default_read_pipesize = fcntl.fcntl(fp_r, fcntl.F_GETPIPE_SZ)
default_write_pipesize = fcntl.fcntl(fp_w, fcntl.F_GETPIPE_SZ)
finally:
os.close(fp_r)
os.close(fp_w)
self.assertEqual(
fcntl.fcntl(proc.stdin.fileno(), fcntl.F_GETPIPE_SZ),
default_read_pipesize)
self.assertEqual(
fcntl.fcntl(proc.stdout.fileno(), fcntl.F_GETPIPE_SZ),
default_write_pipesize)
self.assertEqual(
fcntl.fcntl(proc.stderr.fileno(), fcntl.F_GETPIPE_SZ),
default_write_pipesize)
# On other platforms we cannot test the pipe size (yet). But above
# code using pipesize=-1 should not crash.
finally:
proc.kill()
def test_env(self):
newenv = os.environ.copy()
newenv["FRUIT"] = "orange"
with subprocess.Popen([sys.executable, "-c",
'import sys,os;'
'sys.stdout.write(os.getenv("FRUIT"))'],
stdout=subprocess.PIPE,
env=newenv) as p:
stdout, stderr = p.communicate()
self.assertEqual(stdout, b"orange")
@unittest.skipUnless(sys.platform == "win32", "Windows only issue")
def test_win32_duplicate_envs(self):
newenv = os.environ.copy()
newenv["fRUit"] = "cherry"
newenv["fruit"] = "lemon"
newenv["FRUIT"] = "orange"
newenv["frUit"] = "banana"
with subprocess.Popen(["CMD", "/c", "SET", "fruit"],
stdout=subprocess.PIPE,
env=newenv) as p:
stdout, _ = p.communicate()
self.assertEqual(stdout.strip(), b"frUit=banana")
# Windows requires at least the SYSTEMROOT environment variable to start
# Python
@unittest.skipIf(sys.platform == 'win32',
'cannot test an empty env on Windows')
@unittest.skipIf(sysconfig.get_config_var('Py_ENABLE_SHARED') == 1,
'The Python shared library cannot be loaded '
'with an empty environment.')
@unittest.skipIf(check_sanitizer(address=True),
'AddressSanitizer adds to the environment.')
def test_empty_env(self):
"""Verify that env={} is as empty as possible."""
def is_env_var_to_ignore(n):
"""Determine if an environment variable is under our control."""
# This excludes some __CF_* and VERSIONER_* keys MacOS insists
# on adding even when the environment in exec is empty.
# Gentoo sandboxes also force LD_PRELOAD and SANDBOX_* to exist.
return ('VERSIONER' in n or '__CF' in n or # MacOS
n == 'LD_PRELOAD' or n.startswith('SANDBOX') or # Gentoo
n == 'LC_CTYPE') # Locale coercion triggered
with subprocess.Popen([sys.executable, "-c",
'import os; print(list(os.environ.keys()))'],
stdout=subprocess.PIPE, env={}) as p:
stdout, stderr = p.communicate()
child_env_names = eval(stdout.strip())
self.assertIsInstance(child_env_names, list)
child_env_names = [k for k in child_env_names
if not is_env_var_to_ignore(k)]
self.assertEqual(child_env_names, [])
@unittest.skipIf(sysconfig.get_config_var('Py_ENABLE_SHARED') == 1,
'The Python shared library cannot be loaded '
'without some system environments.')
@unittest.skipIf(check_sanitizer(address=True),
'AddressSanitizer adds to the environment.')
def test_one_environment_variable(self):
newenv = {'fruit': 'orange'}
cmd = [sys.executable, '-c',
'import sys,os;'
'sys.stdout.write("fruit="+os.getenv("fruit"))']
if sys.platform == "win32":
cmd = ["CMD", "/c", "SET", "fruit"]
with subprocess.Popen(cmd, stdout=subprocess.PIPE, stderr=subprocess.PIPE, env=newenv) as p:
stdout, stderr = p.communicate()
if p.returncode and support.verbose:
print("STDOUT:", stdout.decode("ascii", "replace"))
print("STDERR:", stderr.decode("ascii", "replace"))
self.assertEqual(p.returncode, 0)
self.assertEqual(stdout.strip(), b"fruit=orange")
def test_invalid_cmd(self):
# null character in the command name
cmd = sys.executable + '\0'
with self.assertRaises(ValueError):
subprocess.Popen([cmd, "-c", "pass"])
# null character in the command argument
with self.assertRaises(ValueError):
subprocess.Popen([sys.executable, "-c", "pass#\0"])
def test_invalid_env(self):
# null character in the environment variable name
newenv = os.environ.copy()
newenv["FRUIT\0VEGETABLE"] = "cabbage"
with self.assertRaises(ValueError):
subprocess.Popen(ZERO_RETURN_CMD, env=newenv)
# null character in the environment variable value
newenv = os.environ.copy()
newenv["FRUIT"] = "orange\0VEGETABLE=cabbage"
with self.assertRaises(ValueError):
subprocess.Popen(ZERO_RETURN_CMD, env=newenv)
# equal character in the environment variable name
newenv = os.environ.copy()
newenv["FRUIT=ORANGE"] = "lemon"
with self.assertRaises(ValueError):
subprocess.Popen(ZERO_RETURN_CMD, env=newenv)
# equal character in the environment variable value
newenv = os.environ.copy()
newenv["FRUIT"] = "orange=lemon"
with subprocess.Popen([sys.executable, "-c",
'import sys, os;'
'sys.stdout.write(os.getenv("FRUIT"))'],
stdout=subprocess.PIPE,
env=newenv) as p:
stdout, stderr = p.communicate()
self.assertEqual(stdout, b"orange=lemon")
@unittest.skipUnless(sys.platform == "win32", "Windows only issue")
def test_win32_invalid_env(self):
# '=' in the environment variable name
newenv = os.environ.copy()
newenv["FRUIT=VEGETABLE"] = "cabbage"
with self.assertRaises(ValueError):
subprocess.Popen(ZERO_RETURN_CMD, env=newenv)
newenv = os.environ.copy()
newenv["==FRUIT"] = "cabbage"
with self.assertRaises(ValueError):
subprocess.Popen(ZERO_RETURN_CMD, env=newenv)
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.assertEqual(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)
self.addCleanup(p.stdout.close)
self.addCleanup(p.stderr.close)
self.addCleanup(p.stdin.close)
(stdout, stderr) = p.communicate(b"banana")
self.assertEqual(stdout, b"banana")
self.assertEqual(stderr, b"pineapple")
def test_communicate_memoryview_input(self):
# Test memoryview input with byte elements
test_data = b"Hello, memoryview!"
mv = memoryview(test_data)
p = subprocess.Popen([sys.executable, "-c",
'import sys; sys.stdout.write(sys.stdin.read())'],
stdin=subprocess.PIPE,
stdout=subprocess.PIPE)
self.addCleanup(p.stdout.close)
self.addCleanup(p.stdin.close)
(stdout, stderr) = p.communicate(mv)
self.assertEqual(stdout, test_data)
self.assertIsNone(stderr)
def test_communicate_memoryview_input_nonbyte(self):
# Test memoryview input with non-byte elements (e.g., int32)
# This tests the fix for gh-134453 where non-byte memoryviews
# had incorrect length tracking on POSIX
import array
# Create an array of 32-bit integers that's large enough to trigger
# the chunked writing behavior (> PIPE_BUF)
pipe_buf = getattr(select, 'PIPE_BUF', 512)
# Each 'i' element is 4 bytes, so we need more than pipe_buf/4 elements
# Add some extra to ensure we exceed the buffer size
num_elements = pipe_buf + 1
test_array = array.array('i', [0x64306f66 for _ in range(num_elements)])
expected_bytes = test_array.tobytes()
mv = memoryview(test_array)
p = subprocess.Popen([sys.executable, "-c",
'import sys; '
'data = sys.stdin.buffer.read(); '
'sys.stdout.buffer.write(data)'],
stdin=subprocess.PIPE,
stdout=subprocess.PIPE)
self.addCleanup(p.stdout.close)
self.addCleanup(p.stdin.close)
(stdout, stderr) = p.communicate(mv)
self.assertEqual(stdout, expected_bytes,
msg=f"{len(stdout)=} =? {len(expected_bytes)=}")