cpython/Lib/test/test_posix.py

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"Test posix functions"
from test import test_support
# Skip these tests if there is no posix module.
posix = test_support.import_module('posix')
import errno
import time
import os
import pwd
import shutil
import unittest
import warnings
warnings.filterwarnings('ignore', '.* potential security risk .*',
RuntimeWarning)
class PosixTester(unittest.TestCase):
def setUp(self):
# create empty file
fp = open(test_support.TESTFN, 'w+')
fp.close()
def tearDown(self):
os.unlink(test_support.TESTFN)
def testNoArgFunctions(self):
# test posix functions which take no arguments and have
# no side-effects which we need to cleanup (e.g., fork, wait, abort)
NO_ARG_FUNCTIONS = [ "ctermid", "getcwd", "getcwdu", "uname",
"times", "getloadavg", "tmpnam",
"getegid", "geteuid", "getgid", "getgroups",
"getpid", "getpgrp", "getppid", "getuid",
]
for name in NO_ARG_FUNCTIONS:
posix_func = getattr(posix, name, None)
if posix_func is not None:
posix_func()
self.assertRaises(TypeError, posix_func, 1)
if hasattr(posix, 'getresuid'):
def test_getresuid(self):
user_ids = posix.getresuid()
self.assertEqual(len(user_ids), 3)
for val in user_ids:
self.assertGreaterEqual(val, 0)
if hasattr(posix, 'getresgid'):
def test_getresgid(self):
group_ids = posix.getresgid()
self.assertEqual(len(group_ids), 3)
for val in group_ids:
self.assertGreaterEqual(val, 0)
if hasattr(posix, 'setresuid'):
def test_setresuid(self):
current_user_ids = posix.getresuid()
self.assertIsNone(posix.setresuid(*current_user_ids))
# -1 means don't change that value.
self.assertIsNone(posix.setresuid(-1, -1, -1))
def test_setresuid_exception(self):
# Don't do this test if someone is silly enough to run us as root.
current_user_ids = posix.getresuid()
if 0 not in current_user_ids:
new_user_ids = (current_user_ids[0]+1, -1, -1)
self.assertRaises(OSError, posix.setresuid, *new_user_ids)
if hasattr(posix, 'setresgid'):
def test_setresgid(self):
current_group_ids = posix.getresgid()
self.assertIsNone(posix.setresgid(*current_group_ids))
# -1 means don't change that value.
self.assertIsNone(posix.setresgid(-1, -1, -1))
def test_setresgid_exception(self):
# Don't do this test if someone is silly enough to run us as root.
current_group_ids = posix.getresgid()
if 0 not in current_group_ids:
new_group_ids = (current_group_ids[0]+1, -1, -1)
self.assertRaises(OSError, posix.setresgid, *new_group_ids)
@unittest.skipUnless(hasattr(posix, 'initgroups'),
"test needs os.initgroups()")
def test_initgroups(self):
# It takes a string and an integer; check that it raises a TypeError
# for other argument lists.
self.assertRaises(TypeError, posix.initgroups)
self.assertRaises(TypeError, posix.initgroups, None)
self.assertRaises(TypeError, posix.initgroups, 3, "foo")
self.assertRaises(TypeError, posix.initgroups, "foo", 3, object())
# If a non-privileged user invokes it, it should fail with OSError
# EPERM.
if os.getuid() != 0:
name = pwd.getpwuid(posix.getuid()).pw_name
try:
posix.initgroups(name, 13)
except OSError as e:
self.assertEquals(e.errno, errno.EPERM)
else:
self.fail("Expected OSError to be raised by initgroups")
def test_statvfs(self):
if hasattr(posix, 'statvfs'):
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self.assertTrue(posix.statvfs(os.curdir))
def test_fstatvfs(self):
if hasattr(posix, 'fstatvfs'):
fp = open(test_support.TESTFN)
try:
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self.assertTrue(posix.fstatvfs(fp.fileno()))
finally:
fp.close()
def test_ftruncate(self):
if hasattr(posix, 'ftruncate'):
fp = open(test_support.TESTFN, 'w+')
try:
# we need to have some data to truncate
fp.write('test')
fp.flush()
posix.ftruncate(fp.fileno(), 0)
finally:
fp.close()
def test_dup(self):
if hasattr(posix, 'dup'):
fp = open(test_support.TESTFN)
try:
fd = posix.dup(fp.fileno())
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self.assertTrue(isinstance(fd, int))
os.close(fd)
finally:
fp.close()
def test_confstr(self):
if hasattr(posix, 'confstr'):
self.assertRaises(ValueError, posix.confstr, "CS_garbage")
self.assertEqual(len(posix.confstr("CS_PATH")) > 0, True)
def test_dup2(self):
if hasattr(posix, 'dup2'):
fp1 = open(test_support.TESTFN)
fp2 = open(test_support.TESTFN)
try:
posix.dup2(fp1.fileno(), fp2.fileno())
finally:
fp1.close()
fp2.close()
def fdopen_helper(self, *args):
fd = os.open(test_support.TESTFN, os.O_RDONLY)
fp2 = posix.fdopen(fd, *args)
fp2.close()
def test_fdopen(self):
if hasattr(posix, 'fdopen'):
self.fdopen_helper()
self.fdopen_helper('r')
self.fdopen_helper('r', 100)
def test_osexlock(self):
if hasattr(posix, "O_EXLOCK"):
fd = os.open(test_support.TESTFN,
os.O_WRONLY|os.O_EXLOCK|os.O_CREAT)
self.assertRaises(OSError, os.open, test_support.TESTFN,
os.O_WRONLY|os.O_EXLOCK|os.O_NONBLOCK)
os.close(fd)
if hasattr(posix, "O_SHLOCK"):
fd = os.open(test_support.TESTFN,
os.O_WRONLY|os.O_SHLOCK|os.O_CREAT)
self.assertRaises(OSError, os.open, test_support.TESTFN,
os.O_WRONLY|os.O_EXLOCK|os.O_NONBLOCK)
os.close(fd)
def test_osshlock(self):
if hasattr(posix, "O_SHLOCK"):
fd1 = os.open(test_support.TESTFN,
os.O_WRONLY|os.O_SHLOCK|os.O_CREAT)
fd2 = os.open(test_support.TESTFN,
os.O_WRONLY|os.O_SHLOCK|os.O_CREAT)
os.close(fd2)
os.close(fd1)
if hasattr(posix, "O_EXLOCK"):
fd = os.open(test_support.TESTFN,
os.O_WRONLY|os.O_SHLOCK|os.O_CREAT)
self.assertRaises(OSError, os.open, test_support.TESTFN,
os.O_RDONLY|os.O_EXLOCK|os.O_NONBLOCK)
os.close(fd)
def test_fstat(self):
if hasattr(posix, 'fstat'):
fp = open(test_support.TESTFN)
try:
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self.assertTrue(posix.fstat(fp.fileno()))
finally:
fp.close()
def test_stat(self):
if hasattr(posix, 'stat'):
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self.assertTrue(posix.stat(test_support.TESTFN))
if hasattr(posix, 'chown'):
def test_chown(self):
# raise an OSError if the file does not exist
os.unlink(test_support.TESTFN)
self.assertRaises(OSError, posix.chown, test_support.TESTFN, -1, -1)
# re-create the file
open(test_support.TESTFN, 'w').close()
if os.getuid() == 0:
try:
# Many linux distros have a nfsnobody user as MAX_UID-2
# that makes a good test case for signedness issues.
# http://bugs.python.org/issue1747858
# This part of the test only runs when run as root.
# Only scary people run their tests as root.
ent = pwd.getpwnam('nfsnobody')
posix.chown(test_support.TESTFN, ent.pw_uid, ent.pw_gid)
except KeyError:
pass
else:
# non-root cannot chown to root, raises OSError
self.assertRaises(OSError, posix.chown,
test_support.TESTFN, 0, 0)
# test a successful chown call
posix.chown(test_support.TESTFN, os.getuid(), os.getgid())
def test_chdir(self):
if hasattr(posix, 'chdir'):
posix.chdir(os.curdir)
self.assertRaises(OSError, posix.chdir, test_support.TESTFN)
def test_lsdir(self):
if hasattr(posix, 'lsdir'):
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self.assertTrue(test_support.TESTFN in posix.lsdir(os.curdir))
def test_access(self):
if hasattr(posix, 'access'):
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self.assertTrue(posix.access(test_support.TESTFN, os.R_OK))
def test_umask(self):
if hasattr(posix, 'umask'):
old_mask = posix.umask(0)
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self.assertTrue(isinstance(old_mask, int))
posix.umask(old_mask)
def test_strerror(self):
if hasattr(posix, 'strerror'):
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self.assertTrue(posix.strerror(0))
def test_pipe(self):
if hasattr(posix, 'pipe'):
reader, writer = posix.pipe()
os.close(reader)
os.close(writer)
def test_tempnam(self):
if hasattr(posix, 'tempnam'):
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self.assertTrue(posix.tempnam())
self.assertTrue(posix.tempnam(os.curdir))
self.assertTrue(posix.tempnam(os.curdir, 'blah'))
def test_tmpfile(self):
if hasattr(posix, 'tmpfile'):
fp = posix.tmpfile()
fp.close()
def test_utime(self):
if hasattr(posix, 'utime'):
now = time.time()
posix.utime(test_support.TESTFN, None)
self.assertRaises(TypeError, posix.utime, test_support.TESTFN, (None, None))
self.assertRaises(TypeError, posix.utime, test_support.TESTFN, (now, None))
self.assertRaises(TypeError, posix.utime, test_support.TESTFN, (None, now))
posix.utime(test_support.TESTFN, (int(now), int(now)))
posix.utime(test_support.TESTFN, (now, now))
def test_chflags(self):
if hasattr(posix, 'chflags'):
st = os.stat(test_support.TESTFN)
if hasattr(st, 'st_flags'):
posix.chflags(test_support.TESTFN, st.st_flags)
def test_lchflags(self):
if hasattr(posix, 'lchflags'):
st = os.stat(test_support.TESTFN)
if hasattr(st, 'st_flags'):
posix.lchflags(test_support.TESTFN, st.st_flags)
def test_getcwd_long_pathnames(self):
if hasattr(posix, 'getcwd'):
dirname = 'getcwd-test-directory-0123456789abcdef-01234567890abcdef'
curdir = os.getcwd()
base_path = os.path.abspath(test_support.TESTFN) + '.getcwd'
try:
os.mkdir(base_path)
os.chdir(base_path)
except:
# Just returning nothing instead of the SkipTest exception,
# because the test results in Error in that case.
# Is that ok?
# raise unittest.SkipTest, "cannot create directory for testing"
return
try:
def _create_and_do_getcwd(dirname, current_path_length = 0):
try:
os.mkdir(dirname)
except:
raise unittest.SkipTest, "mkdir cannot create directory sufficiently deep for getcwd test"
os.chdir(dirname)
try:
os.getcwd()
if current_path_length < 1027:
_create_and_do_getcwd(dirname, current_path_length + len(dirname) + 1)
finally:
os.chdir('..')
os.rmdir(dirname)
_create_and_do_getcwd(dirname)
finally:
os.chdir(curdir)
shutil.rmtree(base_path)
def test_main():
test_support.run_unittest(PosixTester)
if __name__ == '__main__':
test_main()