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import tempfile
import os
import pexpect
from . import PexpectTestCase
class TestCaseWhich(PexpectTestCase.PexpectTestCase):
" Tests for pexpect.which(). "
def test_which_finds_ls(self):
" which() can find ls(1). "
exercise = pexpect.which("ls")
assert exercise is not None
assert exercise.startswith('/')
def test_os_defpath_which(self):
" which() finds an executable in $PATH and returns its abspath. "
fname = 'cc'
bin_dir = tempfile.mkdtemp()
bin_path = os.path.join(bin_dir, fname)
save_path = os.environ['PATH']
save_defpath = os.defpath
try:
# setup
os.environ['PATH'] = ''
os.defpath = bin_dir
with open(bin_path, 'w') as fp:
pass
# given non-executable,
os.chmod(bin_path, 0o400)
# exercise absolute and relative,
assert pexpect.which(bin_path) is None
assert pexpect.which(fname) is None
# given executable,
os.chmod(bin_path, 0o700)
# exercise absolute and relative,
assert pexpect.which(bin_path) == bin_path
assert pexpect.which(fname) == bin_path
finally:
# restore,
os.environ['PATH'] = save_path
os.defpath = save_defpath
# destroy scratch files and folders,
if os.path.exists(bin_path):
os.unlink(bin_path)
if os.path.exists(bin_dir):
os.rmdir(bin_dir)
def test_path_search_which(self):
" which() finds an executable in $PATH and returns its abspath. "
fname = 'gcc'
bin_dir = tempfile.mkdtemp()
bin_path = os.path.join(bin_dir, fname)
save_path = os.environ['PATH']
try:
# setup
os.environ['PATH'] = bin_dir
with open(bin_path, 'w') as fp:
pass
# given non-executable,
os.chmod(bin_path, 0o400)
# exercise absolute and relative,
assert pexpect.which(bin_path) is None
assert pexpect.which(fname) is None
# given executable,
os.chmod(bin_path, 0o700)
# exercise absolute and relative,
assert pexpect.which(bin_path) == bin_path
assert pexpect.which(fname) == bin_path
finally:
# restore,
os.environ['PATH'] = save_path
# destroy scratch files and folders,
if os.path.exists(bin_path):
os.unlink(bin_path)
if os.path.exists(bin_dir):
os.rmdir(bin_dir)
def test_which_follows_symlink(self):
" which() follows symlinks and returns its path. "
fname = 'original'
symname = 'extra-crispy'
bin_dir = tempfile.mkdtemp()
bin_path = os.path.join(bin_dir, fname)
sym_path = os.path.join(bin_dir, symname)
save_path = os.environ['PATH']
try:
# setup
os.environ['PATH'] = bin_dir
with open(bin_path, 'w') as fp:
pass
os.chmod(bin_path, 0o400)
os.symlink(bin_path, sym_path)
# should not be found because symlink points to non-executable
assert pexpect.which(symname) is None
# but now it should -- because it is executable
os.chmod(bin_path, 0o700)
assert pexpect.which(symname) == sym_path
finally:
# restore,
os.environ['PATH'] = save_path
# destroy scratch files, symlinks, and folders,
if os.path.exists(sym_path):
os.unlink(sym_path)
if os.path.exists(bin_path):
os.unlink(bin_path)
if os.path.exists(bin_dir):
os.rmdir(bin_dir)
def test_which_should_not_match_folders(self):
" Which does not match folders, even though they are executable. "
# make up a path and insert a folder that is 'executable', a naive
# implementation might match (previously pexpect versions 3.2 and
# sh versions 1.0.8, reported by @lcm337.)
fname = 'g++'
bin_dir = tempfile.mkdtemp()
bin_dir2 = os.path.join(bin_dir, fname)
save_path = os.environ['PATH']
try:
os.environ['PATH'] = bin_dir
os.mkdir(bin_dir2, 0o755)
# should not be found because it is not executable *file*,
# but rather, has the executable bit set, as a good folder
# should -- it should not be returned because it fails isdir()
exercise = pexpect.which(fname)
assert exercise is None
finally:
# restore,
os.environ['PATH'] = save_path
# destroy scratch folders,
for _dir in (bin_dir2, bin_dir,):
if os.path.exists(_dir):
os.rmdir(_dir)
def test_which_should_match_other_group_user(self):
" which() returns executables by other, group, and user ownership. "
# create an executable and test that it is found using which() for
# each of the 'other', 'group', and 'user' permission bits.
fname = 'g77'
bin_dir = tempfile.mkdtemp()
bin_path = os.path.join(bin_dir, fname)
save_path = os.environ['PATH']
try:
# setup
os.environ['PATH'] = bin_dir
with open(bin_path, 'w') as fp:
fp.write('#!/bin/sh\necho hello, world\n')
for should_match, mode in ((False, 0o000),
(True, 0o005),
(True, 0o050),
(True, 0o500),
(False, 0o004),
(False, 0o040),
(False, 0o400)):
os.chmod(bin_path, mode)
if not should_match:
# should not be found because it is not executable
assert pexpect.which(fname) is None
else:
# should match full path
assert pexpect.which(fname) == bin_path
finally:
# restore,
os.environ['PATH'] = save_path
# destroy scratch files and folders,
if os.path.exists(bin_path):
os.unlink(bin_path)
if os.path.exists(bin_dir):
os.rmdir(bin_dir)
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