cpython/Lib/test/test_subprocess.py

1112 lines
45 KiB
Python

import unittest
from test import support
import subprocess
import sys
import signal
import os
import errno
import tempfile
import time
import re
import shutil
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("\[\d+ refs\]\r?\n?$", "", stderr.decode()).encode()
#return re.sub(r"\[\d+ refs\]\r?\n?$", "", stderr)
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).
if hasattr(support, "reap_children"):
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(support, "reap_children"):
support.reap_children()
def mkstemp(self, *args, **kwargs):
"""wrapper for mkstemp, calling mktemp if mkstemp is not available"""
if hasattr(tempfile, "mkstemp"):
return tempfile.mkstemp(*args, **kwargs)
else:
fname = tempfile.mktemp(*args, **kwargs)
return os.open(fname, os.O_RDWR|os.O_CREAT), fname
class ProcessTestCase(BaseTestCase):
#
# 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 as e:
self.assertEqual(e.returncode, 47)
else:
self.fail("Expected CalledProcessError")
def test_check_output(self):
# check_output() function with zero return code
output = subprocess.check_output(
[sys.executable, "-c", "print('BDFL')"])
self.assertTrue(b'BDFL' in output)
def test_check_output_nonzero(self):
# check_call() function with non-zero return code
try:
subprocess.check_output(
[sys.executable, "-c", "import sys; sys.exit(5)"])
except subprocess.CalledProcessError as e:
self.assertEqual(e.returncode, 5)
else:
self.fail("Expected CalledProcessError")
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.assertTrue(b'BDFL' in output)
def test_check_output_stdout_arg(self):
# check_output() function stderr redirected to stdout
try:
output = subprocess.check_output(
[sys.executable, "-c", "print('will not be run')"],
stdout=sys.stdout)
except ValueError as e:
self.assertTrue('stdout' in e.args[0])
else:
self.fail("Expected ValueError when stdout arg supplied.")
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):
arg0 = os.path.join(os.path.dirname(sys.executable),
"somethingyoudonthave")
p = subprocess.Popen([arg0, "-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.assertEqual(remove_stderr_debug_decorations(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.assertEqual(remove_stderr_debug_decorations(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.assertEqual(remove_stderr_debug_decorations(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)
output = p.stdout.read()
stripped = remove_stderr_debug_decorations(output)
self.assertEqual(stripped, 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)
output = tf.read()
stripped = remove_stderr_debug_decorations(output)
self.assertEqual(stripped, 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)
# When running with a pydebug build, the # of references is outputted
# to stderr, so just check if stderr at least started with "pinapple"
self.assertEqual(remove_stderr_debug_decorations(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.assertEqual(remove_stderr_debug_decorations(stderr),
b"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 = 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.assertEqual(remove_stderr_debug_decorations(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 mswindows:
max_handles = 1026 # too much for most UNIX systems
else:
max_handles = 2050 # too much for (at least some) Windows setups
handles = []
tmpdir = tempfile.mkdtemp()
try:
for i in range(max_handles):
try:
tmpfile = os.path.join(tmpdir, support.TESTFN)
handles.append(os.open(tmpfile, os.O_WRONLY|os.O_CREAT))
except OSError as e:
if e.errno != errno.EMFILE:
raise
break
else:
self.skipTest("failed to reach the file descriptor limit "
"(tried %d)" % max_handles)
# Close a couple of them (should be enough for a subprocess)
for i in range(10):
os.close(handles.pop())
# Loop creating some subprocesses. If one of them leaks some fds,
# the next loop iteration will fail by reaching the max fd limit.
for i in range(15):
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")
finally:
for h in handles:
os.close(h)
shutil.rmtree(tmpdir)
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 ""')
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.assertTrue(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_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):
try:
subprocess.Popen(['nonexisting_i_hope'],
stdout=subprocess.PIPE,
stderr=subprocess.PIPE)
# Windows raises IOError
except (IOError, OSError) as err:
# ignore errors that indicate the command was not found
if err.errno not in (errno.ENOENT, errno.EACCES):
raise
def test_issue8780(self):
# Ensure that stdout is inherited from the parent
# if stdout=PIPE is not used
code = ';'.join((
'import subprocess, sys',
'retcode = subprocess.call('
"[sys.executable, '-c', 'print(\"Hello World!\")'])",
'assert retcode == 0'))
output = subprocess.check_output([sys.executable, '-c', code])
self.assertTrue(output.startswith(b'Hello World!'), ascii(output))
def test_handles_closed_on_exception(self):
# If CreateProcess exits with an error, ensure the
# duplicate output handles are released
ifhandle, ifname = self.mkstemp()
ofhandle, ofname = self.mkstemp()
efhandle, efname = self.mkstemp()
try:
subprocess.Popen (["*"], stdin=ifhandle, stdout=ofhandle,
stderr=efhandle)
except OSError:
os.close(ifhandle)
os.remove(ifname)
os.close(ofhandle)
os.remove(ofname)
os.close(efhandle)
os.remove(efname)
self.assertFalse(os.path.exists(ifname))
self.assertFalse(os.path.exists(ofname))
self.assertFalse(os.path.exists(efname))
def test_communicate_epipe(self):
# Issue 10963: communicate() should hide EPIPE
p = subprocess.Popen([sys.executable, "-c", 'pass'],
stdin=subprocess.PIPE,
stdout=subprocess.PIPE,
stderr=subprocess.PIPE)
self.addCleanup(p.stdout.close)
self.addCleanup(p.stderr.close)
self.addCleanup(p.stdin.close)
p.communicate(b"x" * 2**20)
def test_communicate_epipe_only_stdin(self):
# Issue 10963: communicate() should hide EPIPE
p = subprocess.Popen([sys.executable, "-c", 'pass'],
stdin=subprocess.PIPE)
self.addCleanup(p.stdin.close)
time.sleep(2)
p.communicate(b"x" * 2**20)
#
# POSIX tests
#
if not mswindows:
def test_exceptions(self):
# caught & re-raised exceptions
try:
p = subprocess.Popen([sys.executable, "-c", ""],
cwd="/this/path/does/not/exist")
except OSError as 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.
"""
if sys.platform == 'darwin':
# Check if the 'Crash Reporter' on OSX was configured
# in 'Developer' mode and warn that it will get triggered
# when it is.
#
# This assumes that this context manager is used in tests
# that might trigger the next manager.
value = subprocess.Popen(['/usr/bin/defaults', 'read',
'com.apple.CrashReporter', 'DialogType'],
stdout=subprocess.PIPE).communicate()[0]
if value.strip() == b'developer':
print("this tests triggers the Crash Reporter, "
"that is intentional", end='')
sys.stdout.flush()
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(), b"apple")
def test_args_string(self):
# args is a string
fd, fname = self.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 = self.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 test_specific_shell(self):
# Issue #9265: Incorrect name passed as arg[0].
shells = []
for prefix in ['/bin', '/usr/bin/', '/usr/local/bin']:
for name in ['bash', 'ksh']:
sh = os.path.join(prefix, name)
if os.path.isfile(sh):
shells.append(sh)
if not shells: # Will probably work for any shell but csh.
self.skipTest("bash or ksh required for this test")
sh = '/bin/sh'
if os.path.isfile(sh) and not os.path.islink(sh):
# Test will fail if /bin/sh is a symlink to csh.
shells.append(sh)
for sh in shells:
p = subprocess.Popen("echo $0", executable=sh, shell=True,
stdout=subprocess.PIPE)
self.assertEqual(p.stdout.read().strip(), bytes(sh, 'ascii'))
def DISABLED_test_send_signal(self):
p = subprocess.Popen([sys.executable,
"-c", "input()"])
self.assertTrue(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.assertTrue(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.assertTrue(p.poll() is None, p.poll())
p.terminate()
self.assertEqual(p.wait(), -signal.SIGTERM)
def test_undecodable_env(self):
for key, value in (('test', 'abc\uDCFF'), ('test\uDCFF', '42')):
value_repr = ascii(value).encode("ascii")
# test str with surrogates
script = "import os; print(ascii(os.getenv(%s)))" % repr(key)
env = os.environ.copy()
env[key] = value
# Force surrogate-escaping of \xFF in the child process;
# otherwise it can be decoded as-is if the default locale
# is latin-1.
env['PYTHONFSENCODING'] = 'ascii'
stdout = subprocess.check_output(
[sys.executable, "-c", script],
env=env)
stdout = stdout.rstrip(b'\n\r')
self.assertEqual(stdout, value_repr)
# test bytes
key = key.encode("ascii", "surrogateescape")
value = value.encode("ascii", "surrogateescape")
script = "import os; print(ascii(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.assertEqual(stdout, value_repr)
def test_wait_when_sigchild_ignored(self):
# NOTE: sigchild_ignore.py may not be an effective test on all OSes.
sigchild_ignore = support.findfile("sigchild_ignore.py",
subdir="subprocessdata")
p = subprocess.Popen([sys.executable, sigchild_ignore],
stdout=subprocess.PIPE, stderr=subprocess.PIPE)
stdout, stderr = p.communicate()
self.assertEqual(0, p.returncode, "sigchild_ignore.py exited"
" non-zero with this error:\n%s" %
stderr.decode('utf8'))
def check_close_std_fds(self, fds):
# Issue #9905: test that subprocess pipes still work properly with
# some standard fds closed
stdin = 0
newfds = []
for a in fds:
b = os.dup(a)
newfds.append(b)
if a == 0:
stdin = b
try:
for fd in fds:
os.close(fd)
out, err = subprocess.Popen([sys.executable, "-c",
'import sys;'
'sys.stdout.write("apple");'
'sys.stdout.flush();'
'sys.stderr.write("orange")'],
stdin=stdin,
stdout=subprocess.PIPE,
stderr=subprocess.PIPE).communicate()
err = support.strip_python_stderr(err)
self.assertEqual((out, err), (b'apple', b'orange'))
finally:
for b, a in zip(newfds, fds):
os.dup2(b, a)
for b in newfds:
os.close(b)
def test_close_fd_0(self):
self.check_close_std_fds([0])
def test_close_fd_1(self):
self.check_close_std_fds([1])
def test_close_fd_2(self):
self.check_close_std_fds([2])
def test_close_fds_0_1(self):
self.check_close_std_fds([0, 1])
def test_close_fds_0_2(self):
self.check_close_std_fds([0, 2])
def test_close_fds_1_2(self):
self.check_close_std_fds([1, 2])
def test_close_fds_0_1_2(self):
# Issue #10806: test that subprocess pipes still work properly with
# all standard fds closed.
self.check_close_std_fds([0, 1, 2])
def test_surrogates_error_message(self):
def prepare():
raise ValueError("surrogate:\uDCff")
def test_select_unbuffered(self):
# Issue #11459: bufsize=0 should really set the pipes as
# unbuffered (and therefore let select() work properly).
select = support.import_module("select")
p = subprocess.Popen([sys.executable, "-c",
'import sys;'
'sys.stdout.write("apple")'],
stdout=subprocess.PIPE,
bufsize=0)
f = p.stdout
self.addCleanup(f.close)
try:
self.assertEqual(f.read(4), b"appl")
self.assertIn(f, select.select([f], [], [], 0.0)[0])
finally:
p.wait()
#
# 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(b"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(b"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.assertTrue(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.assertTrue(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.assertTrue(p.poll() is None, p.poll())
p.terminate()
self.assertNotEqual(p.wait(), 0)
class CommandTests(unittest.TestCase):
# 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.
if os.name == 'posix':
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)
unit_tests = [ProcessTestCase, CommandTests]
if mswindows:
class CommandsWithSpaces (BaseTestCase):
def setUp(self):
super().setUp()
f, fname = self.mkstemp(".py", "te st")
self.fname = fname.lower ()
os.write(f, b"import sys;"
b"sys.stdout.write('%d %s' % (len(sys.argv), [a.lower () for a in sys.argv]))"
)
os.close(f)
def tearDown(self):
os.remove(self.fname)
super().tearDown()
def with_spaces(self, *args, **kwargs):
kwargs['stdout'] = subprocess.PIPE
p = subprocess.Popen(*args, **kwargs)
self.assertEqual(
p.stdout.read ().decode("mbcs"),
"2 [%r, 'ab cd']" % self.fname
)
def test_shell_string_with_spaces(self):
# call() function with string argument with spaces on Windows
self.with_spaces('"%s" "%s" "%s"' % (sys.executable, self.fname,
"ab cd"), shell=1)
def test_shell_sequence_with_spaces(self):
# call() function with sequence argument with spaces on Windows
self.with_spaces([sys.executable, self.fname, "ab cd"], shell=1)
def test_noshell_string_with_spaces(self):
# call() function with string argument with spaces on Windows
self.with_spaces('"%s" "%s" "%s"' % (sys.executable, self.fname,
"ab cd"))
def test_noshell_sequence_with_spaces(self):
# call() function with sequence argument with spaces on Windows
self.with_spaces([sys.executable, self.fname, "ab cd"])
unit_tests.append(CommandsWithSpaces)
if getattr(subprocess, '_has_poll', False):
class ProcessTestCaseNoPoll(ProcessTestCase):
def setUp(self):
subprocess._has_poll = False
ProcessTestCase.setUp(self)
def tearDown(self):
subprocess._has_poll = True
ProcessTestCase.tearDown(self)
unit_tests.append(ProcessTestCaseNoPoll)
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)
unit_tests.append(HelperFunctionTests)
def test_main():
support.run_unittest(*unit_tests)
support.reap_children()
if __name__ == "__main__":
test_main()