Lib/test/test_shutil.py

# Copyright (C) 2003 Python Software Foundation

import unittest
import shutil
import tempfile
import sys
import stat
import os
import os.path
from test import support
from test.support import TESTFN
from os.path import splitdrive
from distutils.spawn import find_executable, spawn
from shutil import (_make_tarball, _make_zipfile, make_archive,
                    register_archive_format, unregister_archive_format,
                    get_archive_formats, Error)
import tarfile
import warnings

from test import support
from test.support import TESTFN, check_warnings, captured_stdout

TESTFN2 = TESTFN + "2"

try:
    import grp
    import pwd
    UID_GID_SUPPORT = True
except ImportError:
    UID_GID_SUPPORT = False

try:
    import zlib
except ImportError:
    zlib = None

try:
    import zipfile
    ZIP_SUPPORT = True
except ImportError:
    ZIP_SUPPORT = find_executable('zip')

class TestShutil(unittest.TestCase):

    def setUp(self):
        super(TestShutil, self).setUp()
        self.tempdirs = []

    def tearDown(self):
        super(TestShutil, self).tearDown()
        while self.tempdirs:
            d = self.tempdirs.pop()
            shutil.rmtree(d, os.name in ('nt', 'cygwin'))

    def write_file(self, path, content='xxx'):
        """Writes a file in the given path.


        path can be a string or a sequence.
        """
        if isinstance(path, (list, tuple)):
            path = os.path.join(*path)
        f = open(path, 'w')
        try:
            f.write(content)
        finally:
            f.close()

    def mkdtemp(self):
        """Create a temporary directory that will be cleaned up.

        Returns the path of the directory.
        """
        d = tempfile.mkdtemp()
        self.tempdirs.append(d)
        return d

    def test_rmtree_errors(self):
        # filename is guaranteed not to exist
        filename = tempfile.mktemp()
        self.assertRaises(OSError, shutil.rmtree, filename)

    # See bug #1071513 for why we don't run this on cygwin
    # and bug #1076467 for why we don't run this as root.
    if (hasattr(os, 'chmod') and sys.platform[:6] != 'cygwin'
        and not (hasattr(os, 'geteuid') and os.geteuid() == 0)):
        def test_on_error(self):
            self.errorState = 0
            os.mkdir(TESTFN)
            self.childpath = os.path.join(TESTFN, 'a')
            f = open(self.childpath, 'w')
            f.close()
            old_dir_mode = os.stat(TESTFN).st_mode
            old_child_mode = os.stat(self.childpath).st_mode
            # Make unwritable.
            os.chmod(self.childpath, stat.S_IREAD)
            os.chmod(TESTFN, stat.S_IREAD)

            shutil.rmtree(TESTFN, onerror=self.check_args_to_onerror)
            # Test whether onerror has actually been called.
            self.assertEqual(self.errorState, 2,
                             "Expected call to onerror function did not happen.")

            # Make writable again.
            os.chmod(TESTFN, old_dir_mode)
            os.chmod(self.childpath, old_child_mode)

            # Clean up.
            shutil.rmtree(TESTFN)

    def check_args_to_onerror(self, func, arg, exc):
        # test_rmtree_errors deliberately runs rmtree
        # on a directory that is chmod 400, which will fail.
        # This function is run when shutil.rmtree fails.
        # 99.9% of the time it initially fails to remove
        # a file in the directory, so the first time through
        # func is os.remove.
        # However, some Linux machines running ZFS on
        # FUSE experienced a failure earlier in the process
        # at os.listdir.  The first failure may legally
        # be either.
        if self.errorState == 0:
            if func is os.remove:
                self.assertEqual(arg, self.childpath)
            else:
                self.assertIs(func, os.listdir,
                              "func must be either os.remove or os.listdir")
                self.assertEqual(arg, TESTFN)
            self.assertTrue(issubclass(exc[0], OSError))
            self.errorState = 1
        else:
            self.assertEqual(func, os.rmdir)
            self.assertEqual(arg, TESTFN)
            self.assertTrue(issubclass(exc[0], OSError))
            self.errorState = 2

    def test_rmtree_dont_delete_file(self):
        # When called on a file instead of a directory, don't delete it.
        handle, path = tempfile.mkstemp()
        os.fdopen(handle).close()
        self.assertRaises(OSError, shutil.rmtree, path)
        os.remove(path)

    def _write_data(self, path, data):
        f = open(path, "w")
        f.write(data)
        f.close()

    def test_copytree_simple(self):

        def read_data(path):
            f = open(path)
            data = f.read()
            f.close()
            return data

        src_dir = tempfile.mkdtemp()
        dst_dir = os.path.join(tempfile.mkdtemp(), 'destination')
        self._write_data(os.path.join(src_dir, 'test.txt'), '123')
        os.mkdir(os.path.join(src_dir, 'test_dir'))
        self._write_data(os.path.join(src_dir, 'test_dir', 'test.txt'), '456')

        try:
            shutil.copytree(src_dir, dst_dir)
            self.assertTrue(os.path.isfile(os.path.join(dst_dir, 'test.txt')))
            self.assertTrue(os.path.isdir(os.path.join(dst_dir, 'test_dir')))
            self.assertTrue(os.path.isfile(os.path.join(dst_dir, 'test_dir',
                                                        'test.txt')))
            actual = read_data(os.path.join(dst_dir, 'test.txt'))
            self.assertEqual(actual, '123')
            actual = read_data(os.path.join(dst_dir, 'test_dir', 'test.txt'))
            self.assertEqual(actual, '456')
        finally:
            for path in (
                    os.path.join(src_dir, 'test.txt'),
                    os.path.join(dst_dir, 'test.txt'),
                    os.path.join(src_dir, 'test_dir', 'test.txt'),
                    os.path.join(dst_dir, 'test_dir', 'test.txt'),
                ):
                if os.path.exists(path):
                    os.remove(path)
            for path in (src_dir,
                    os.path.dirname(dst_dir)
                ):
                if os.path.exists(path):
                    shutil.rmtree(path)

    def test_copytree_with_exclude(self):

        def read_data(path):
            f = open(path)
            data = f.read()
            f.close()
            return data

        # creating data
        join = os.path.join
        exists = os.path.exists
        src_dir = tempfile.mkdtemp()
        try:
            dst_dir = join(tempfile.mkdtemp(), 'destination')
            self._write_data(join(src_dir, 'test.txt'), '123')
            self._write_data(join(src_dir, 'test.tmp'), '123')
            os.mkdir(join(src_dir, 'test_dir'))
            self._write_data(join(src_dir, 'test_dir', 'test.txt'), '456')
            os.mkdir(join(src_dir, 'test_dir2'))
            self._write_data(join(src_dir, 'test_dir2', 'test.txt'), '456')
            os.mkdir(join(src_dir, 'test_dir2', 'subdir'))
            os.mkdir(join(src_dir, 'test_dir2', 'subdir2'))
            self._write_data(join(src_dir, 'test_dir2', 'subdir', 'test.txt'),
                             '456')
            self._write_data(join(src_dir, 'test_dir2', 'subdir2', 'test.py'),
                             '456')


            # testing glob-like patterns
            try:
                patterns = shutil.ignore_patterns('*.tmp', 'test_dir2')
                shutil.copytree(src_dir, dst_dir, ignore=patterns)
                # checking the result: some elements should not be copied
                self.assertTrue(exists(join(dst_dir, 'test.txt')))
                self.assertTrue(not exists(join(dst_dir, 'test.tmp')))
                self.assertTrue(not exists(join(dst_dir, 'test_dir2')))
            finally:
                if os.path.exists(dst_dir):
                    shutil.rmtree(dst_dir)
            try:
                patterns = shutil.ignore_patterns('*.tmp', 'subdir*')
                shutil.copytree(src_dir, dst_dir, ignore=patterns)
                # checking the result: some elements should not be copied
                self.assertTrue(not exists(join(dst_dir, 'test.tmp')))
                self.assertTrue(not exists(join(dst_dir, 'test_dir2', 'subdir2')))
                self.assertTrue(not exists(join(dst_dir, 'test_dir2', 'subdir')))
            finally:
                if os.path.exists(dst_dir):
                    shutil.rmtree(dst_dir)

            # testing callable-style
            try:
                def _filter(src, names):
                    res = []
                    for name in names:
                        path = os.path.join(src, name)

                        if (os.path.isdir(path) and
                            path.split()[-1] == 'subdir'):
                            res.append(name)
                        elif os.path.splitext(path)[-1] in ('.py'):
                            res.append(name)
                    return res

                shutil.copytree(src_dir, dst_dir, ignore=_filter)

                # checking the result: some elements should not be copied
                self.assertTrue(not exists(join(dst_dir, 'test_dir2', 'subdir2',
                                        'test.py')))
                self.assertTrue(not exists(join(dst_dir, 'test_dir2', 'subdir')))

            finally:
                if os.path.exists(dst_dir):
                    shutil.rmtree(dst_dir)
        finally:
            shutil.rmtree(src_dir)
            shutil.rmtree(os.path.dirname(dst_dir))

    @unittest.skipUnless(hasattr(os, 'symlink'), 'requires os.symlink')
    def test_dont_copy_file_onto_link_to_itself(self):
        # bug 851123.
        os.mkdir(TESTFN)
        src = os.path.join(TESTFN, 'cheese')
        dst = os.path.join(TESTFN, 'shop')
        try:
            f = open(src, 'w')
            f.write('cheddar')
            f.close()

            os.link(src, dst)
            self.assertRaises(shutil.Error, shutil.copyfile, src, dst)
            self.assertEqual(open(src,'r').read(), 'cheddar')
            os.remove(dst)

            # Using `src` here would mean we end up with a symlink pointing
            # to TESTFN/TESTFN/cheese, while it should point at
            # TESTFN/cheese.
            os.symlink('cheese', dst)
            self.assertRaises(shutil.Error, shutil.copyfile, src, dst)
            self.assertEqual(open(src,'r').read(), 'cheddar')
            os.remove(dst)
        finally:
            try:
                shutil.rmtree(TESTFN)
            except OSError:
                pass

        @unittest.skipUnless(hasattr(os, 'symlink'), 'requires os.symlink')
        def test_rmtree_on_symlink(self):
            # bug 1669.
            os.mkdir(TESTFN)
            try:
                src = os.path.join(TESTFN, 'cheese')
                dst = os.path.join(TESTFN, 'shop')
                os.mkdir(src)
                os.symlink(src, dst)
                self.assertRaises(OSError, shutil.rmtree, dst)
            finally:
                shutil.rmtree(TESTFN, ignore_errors=True)

    @unittest.skipUnless(hasattr(os, 'mkfifo'), 'requires os.mkfifo')
    # Issue #3002: copyfile and copytree block indefinitely on named pipes
    def test_copyfile_named_pipe(self):
        os.mkfifo(TESTFN)
        try:
            self.assertRaises(shutil.SpecialFileError,
                                shutil.copyfile, TESTFN, TESTFN2)
            self.assertRaises(shutil.SpecialFileError,
                                shutil.copyfile, __file__, TESTFN)
        finally:
            os.remove(TESTFN)

    @unittest.skipUnless(hasattr(os, 'mkfifo'), 'requires os.mkfifo')
    def test_copytree_named_pipe(self):
        os.mkdir(TESTFN)
        try:
            subdir = os.path.join(TESTFN, "subdir")
            os.mkdir(subdir)
            pipe = os.path.join(subdir, "mypipe")
            os.mkfifo(pipe)
            try:
                shutil.copytree(TESTFN, TESTFN2)
            except shutil.Error as e:
                errors = e.args[0]
                self.assertEqual(len(errors), 1)
                src, dst, error_msg = errors[0]
                self.assertEqual("`%s` is a named pipe" % pipe, error_msg)
            else:
                self.fail("shutil.Error should have been raised")
        finally:
            shutil.rmtree(TESTFN, ignore_errors=True)
            shutil.rmtree(TESTFN2, ignore_errors=True)

    def test_copytree_special_func(self):

        src_dir = self.mkdtemp()
        dst_dir = os.path.join(self.mkdtemp(), 'destination')
        self._write_data(os.path.join(src_dir, 'test.txt'), '123')
        os.mkdir(os.path.join(src_dir, 'test_dir'))
        self._write_data(os.path.join(src_dir, 'test_dir', 'test.txt'), '456')

        copied = []
        def _copy(src, dst):
            copied.append((src, dst))

        shutil.copytree(src_dir, dst_dir, copy_function=_copy)
        self.assertEquals(len(copied), 2)

    @unittest.skipUnless(hasattr(os, 'symlink'), 'requires os.symlink')
    def test_copytree_dangling_symlinks(self):

        # a dangling symlink raises an error at the end
        src_dir = self.mkdtemp()
        dst_dir = os.path.join(self.mkdtemp(), 'destination')
        os.symlink('IDONTEXIST', os.path.join(src_dir, 'test.txt'))
        os.mkdir(os.path.join(src_dir, 'test_dir'))
        self._write_data(os.path.join(src_dir, 'test_dir', 'test.txt'), '456')
        self.assertRaises(Error, shutil.copytree, src_dir, dst_dir)

        # a dangling symlink is ignored with the proper flag
        dst_dir = os.path.join(self.mkdtemp(), 'destination2')
        shutil.copytree(src_dir, dst_dir, ignore_dangling_symlinks=True)
        self.assertNotIn('test.txt', os.listdir(dst_dir))

        # a dangling symlink is copied if symlinks=True
        dst_dir = os.path.join(self.mkdtemp(), 'destination3')
        shutil.copytree(src_dir, dst_dir, symlinks=True)
        self.assertIn('test.txt', os.listdir(dst_dir))

    @unittest.skipUnless(zlib, "requires zlib")
    def test_make_tarball(self):
        # creating something to tar
        tmpdir = self.mkdtemp()
        self.write_file([tmpdir, 'file1'], 'xxx')
        self.write_file([tmpdir, 'file2'], 'xxx')
        os.mkdir(os.path.join(tmpdir, 'sub'))
        self.write_file([tmpdir, 'sub', 'file3'], 'xxx')

        tmpdir2 = self.mkdtemp()
        unittest.skipUnless(splitdrive(tmpdir)[0] == splitdrive(tmpdir2)[0],
                            "source and target should be on same drive")

        base_name = os.path.join(tmpdir2, 'archive')

        # working with relative paths to avoid tar warnings
        old_dir = os.getcwd()
        os.chdir(tmpdir)
        try:
            _make_tarball(splitdrive(base_name)[1], '.')
        finally:
            os.chdir(old_dir)

        # check if the compressed tarball was created
        tarball = base_name + '.tar.gz'
        self.assertTrue(os.path.exists(tarball))

        # trying an uncompressed one
        base_name = os.path.join(tmpdir2, 'archive')
        old_dir = os.getcwd()
        os.chdir(tmpdir)
        try:
            _make_tarball(splitdrive(base_name)[1], '.', compress=None)
        finally:
            os.chdir(old_dir)
        tarball = base_name + '.tar'
        self.assertTrue(os.path.exists(tarball))

    def _tarinfo(self, path):
        tar = tarfile.open(path)
        try:
            names = tar.getnames()
            names.sort()
            return tuple(names)
        finally:
            tar.close()

    def _create_files(self):
        # creating something to tar
        tmpdir = self.mkdtemp()
        dist = os.path.join(tmpdir, 'dist')
        os.mkdir(dist)
        self.write_file([dist, 'file1'], 'xxx')
        self.write_file([dist, 'file2'], 'xxx')
        os.mkdir(os.path.join(dist, 'sub'))
        self.write_file([dist, 'sub', 'file3'], 'xxx')
        os.mkdir(os.path.join(dist, 'sub2'))
        tmpdir2 = self.mkdtemp()
        base_name = os.path.join(tmpdir2, 'archive')
        return tmpdir, tmpdir2, base_name

    @unittest.skipUnless(zlib, "Requires zlib")
    @unittest.skipUnless(find_executable('tar') and find_executable('gzip'),
                         'Need the tar command to run')
    def test_tarfile_vs_tar(self):
        tmpdir, tmpdir2, base_name =  self._create_files()
        old_dir = os.getcwd()
        os.chdir(tmpdir)
        try:
            _make_tarball(base_name, 'dist')
        finally:
            os.chdir(old_dir)

        # check if the compressed tarball was created
        tarball = base_name + '.tar.gz'
        self.assertTrue(os.path.exists(tarball))

        # now create another tarball using `tar`
        tarball2 = os.path.join(tmpdir, 'archive2.tar.gz')
        tar_cmd = ['tar', '-cf', 'archive2.tar', 'dist']
        gzip_cmd = ['gzip', '-f9', 'archive2.tar']
        old_dir = os.getcwd()
        os.chdir(tmpdir)
        try:
            with captured_stdout() as s:
                spawn(tar_cmd)
                spawn(gzip_cmd)
        finally:
            os.chdir(old_dir)

        self.assertTrue(os.path.exists(tarball2))
        # let's compare both tarballs
        self.assertEquals(self._tarinfo(tarball), self._tarinfo(tarball2))

        # trying an uncompressed one
        base_name = os.path.join(tmpdir2, 'archive')
        old_dir = os.getcwd()
        os.chdir(tmpdir)
        try:
            _make_tarball(base_name, 'dist', compress=None)
        finally:
            os.chdir(old_dir)
        tarball = base_name + '.tar'
        self.assertTrue(os.path.exists(tarball))

        # now for a dry_run
        base_name = os.path.join(tmpdir2, 'archive')
        old_dir = os.getcwd()
        os.chdir(tmpdir)
        try:
            _make_tarball(base_name, 'dist', compress=None, dry_run=True)
        finally:
            os.chdir(old_dir)
        tarball = base_name + '.tar'
        self.assertTrue(os.path.exists(tarball))

    @unittest.skipUnless(zlib, "Requires zlib")
    @unittest.skipUnless(ZIP_SUPPORT, 'Need zip support to run')
    def test_make_zipfile(self):
        # creating something to tar
        tmpdir = self.mkdtemp()
        self.write_file([tmpdir, 'file1'], 'xxx')
        self.write_file([tmpdir, 'file2'], 'xxx')

        tmpdir2 = self.mkdtemp()
        base_name = os.path.join(tmpdir2, 'archive')
        _make_zipfile(base_name, tmpdir)

        # check if the compressed tarball was created
        tarball = base_name + '.zip'


    def test_make_archive(self):
        tmpdir = self.mkdtemp()
        base_name = os.path.join(tmpdir, 'archive')
        self.assertRaises(ValueError, make_archive, base_name, 'xxx')

    @unittest.skipUnless(zlib, "Requires zlib")
    def test_make_archive_owner_group(self):
        # testing make_archive with owner and group, with various combinations
        # this works even if there's not gid/uid support
        if UID_GID_SUPPORT:
            group = grp.getgrgid(0)[0]
            owner = pwd.getpwuid(0)[0]
        else:
            group = owner = 'root'

        base_dir, root_dir, base_name =  self._create_files()
        base_name = os.path.join(self.mkdtemp() , 'archive')
        res = make_archive(base_name, 'zip', root_dir, base_dir, owner=owner,
                           group=group)
        self.assertTrue(os.path.exists(res))

        res = make_archive(base_name, 'zip', root_dir, base_dir)
        self.assertTrue(os.path.exists(res))

        res = make_archive(base_name, 'tar', root_dir, base_dir,
                           owner=owner, group=group)
        self.assertTrue(os.path.exists(res))

        res = make_archive(base_name, 'tar', root_dir, base_dir,
                           owner='kjhkjhkjg', group='oihohoh')
        self.assertTrue(os.path.exists(res))

    @unittest.skipUnless(zlib, "Requires zlib")
    @unittest.skipUnless(UID_GID_SUPPORT, "Requires grp and pwd support")
    def test_tarfile_root_owner(self):
        tmpdir, tmpdir2, base_name =  self._create_files()
        old_dir = os.getcwd()
        os.chdir(tmpdir)
        group = grp.getgrgid(0)[0]
        owner = pwd.getpwuid(0)[0]
        try:
            archive_name = _make_tarball(base_name, 'dist', compress=None,
                                         owner=owner, group=group)
        finally:
            os.chdir(old_dir)

        # check if the compressed tarball was created
        self.assertTrue(os.path.exists(archive_name))

        # now checks the rights
        archive = tarfile.open(archive_name)
        try:
            for member in archive.getmembers():
                self.assertEquals(member.uid, 0)
                self.assertEquals(member.gid, 0)
        finally:
            archive.close()

    def test_make_archive_cwd(self):
        current_dir = os.getcwd()
        def _breaks(*args, **kw):
            raise RuntimeError()

        register_archive_format('xxx', _breaks, [], 'xxx file')
        try:
            try:
                make_archive('xxx', 'xxx', root_dir=self.mkdtemp())
            except Exception:
                pass
            self.assertEquals(os.getcwd(), current_dir)
        finally:
            unregister_archive_format('xxx')

    def test_register_archive_format(self):

        self.assertRaises(TypeError, register_archive_format, 'xxx', 1)
        self.assertRaises(TypeError, register_archive_format, 'xxx', lambda: x,
                          1)
        self.assertRaises(TypeError, register_archive_format, 'xxx', lambda: x,
                          [(1, 2), (1, 2, 3)])

        register_archive_format('xxx', lambda: x, [(1, 2)], 'xxx file')
        formats = [name for name, params in get_archive_formats()]
        self.assertIn('xxx', formats)

        unregister_archive_format('xxx')
        formats = [name for name, params in get_archive_formats()]
        self.assertNotIn('xxx', formats)


class TestMove(unittest.TestCase):

    def setUp(self):
        filename = "foo"
        self.src_dir = tempfile.mkdtemp()
        self.dst_dir = tempfile.mkdtemp()
        self.src_file = os.path.join(self.src_dir, filename)
        self.dst_file = os.path.join(self.dst_dir, filename)
        # Try to create a dir in the current directory, hoping that it is
        # not located on the same filesystem as the system tmp dir.
        try:
            self.dir_other_fs = tempfile.mkdtemp(
                dir=os.path.dirname(__file__))
            self.file_other_fs = os.path.join(self.dir_other_fs,
                filename)
        except OSError:
            self.dir_other_fs = None
        with open(self.src_file, "wb") as f:
            f.write(b"spam")

    def tearDown(self):
        for d in (self.src_dir, self.dst_dir, self.dir_other_fs):
            try:
                if d:
                    shutil.rmtree(d)
            except:
                pass

    def _check_move_file(self, src, dst, real_dst):
        contents = open(src, "rb").read()
        shutil.move(src, dst)
        self.assertEqual(contents, open(real_dst, "rb").read())
        self.assertFalse(os.path.exists(src))

    def _check_move_dir(self, src, dst, real_dst):
        contents = sorted(os.listdir(src))
        shutil.move(src, dst)
        self.assertEqual(contents, sorted(os.listdir(real_dst)))
        self.assertFalse(os.path.exists(src))

    def test_move_file(self):
        # Move a file to another location on the same filesystem.
        self._check_move_file(self.src_file, self.dst_file, self.dst_file)

    def test_move_file_to_dir(self):
        # Move a file inside an existing dir on the same filesystem.
        self._check_move_file(self.src_file, self.dst_dir, self.dst_file)

    def test_move_file_other_fs(self):
        # Move a file to an existing dir on another filesystem.
        if not self.dir_other_fs:
            # skip
            return
        self._check_move_file(self.src_file, self.file_other_fs,
            self.file_other_fs)

    def test_move_file_to_dir_other_fs(self):
        # Move a file to another location on another filesystem.
        if not self.dir_other_fs:
            # skip
            return
        self._check_move_file(self.src_file, self.dir_other_fs,
            self.file_other_fs)

    def test_move_dir(self):
        # Move a dir to another location on the same filesystem.
        dst_dir = tempfile.mktemp()
        try:
            self._check_move_dir(self.src_dir, dst_dir, dst_dir)
        finally:
            try:
                shutil.rmtree(dst_dir)
            except:
                pass

    def test_move_dir_other_fs(self):
        # Move a dir to another location on another filesystem.
        if not self.dir_other_fs:
            # skip
            return
        dst_dir = tempfile.mktemp(dir=self.dir_other_fs)
        try:
            self._check_move_dir(self.src_dir, dst_dir, dst_dir)
        finally:
            try:
                shutil.rmtree(dst_dir)
            except:
                pass

    def test_move_dir_to_dir(self):
        # Move a dir inside an existing dir on the same filesystem.
        self._check_move_dir(self.src_dir, self.dst_dir,
            os.path.join(self.dst_dir, os.path.basename(self.src_dir)))

    def test_move_dir_to_dir_other_fs(self):
        # Move a dir inside an existing dir on another filesystem.
        if not self.dir_other_fs:
            # skip
            return
        self._check_move_dir(self.src_dir, self.dir_other_fs,
            os.path.join(self.dir_other_fs, os.path.basename(self.src_dir)))

    def test_existing_file_inside_dest_dir(self):
        # A file with the same name inside the destination dir already exists.
        with open(self.dst_file, "wb"):
            pass
        self.assertRaises(shutil.Error, shutil.move, self.src_file, self.dst_dir)

    def test_dont_move_dir_in_itself(self):
        # Moving a dir inside itself raises an Error.
        dst = os.path.join(self.src_dir, "bar")
        self.assertRaises(shutil.Error, shutil.move, self.src_dir, dst)

    def test_destinsrc_false_negative(self):
        os.mkdir(TESTFN)
        try:
            for src, dst in [('srcdir', 'srcdir/dest')]:
                src = os.path.join(TESTFN, src)
                dst = os.path.join(TESTFN, dst)
                self.assertTrue(shutil._destinsrc(src, dst),
                             msg='_destinsrc() wrongly concluded that '
                             'dst (%s) is not in src (%s)' % (dst, src))
        finally:
            shutil.rmtree(TESTFN, ignore_errors=True)

    def test_destinsrc_false_positive(self):
        os.mkdir(TESTFN)
        try:
            for src, dst in [('srcdir', 'src/dest'), ('srcdir', 'srcdir.new')]:
                src = os.path.join(TESTFN, src)
                dst = os.path.join(TESTFN, dst)
                self.assertFalse(shutil._destinsrc(src, dst),
                            msg='_destinsrc() wrongly concluded that '
                            'dst (%s) is in src (%s)' % (dst, src))
        finally:
            shutil.rmtree(TESTFN, ignore_errors=True)


def test_main():
    support.run_unittest(TestShutil, TestMove)

if __name__ == '__main__':
    test_main()