summaryrefslogtreecommitdiff
path: root/tests/unittests/test_util.py
blob: fc6b9d40b9779b02f207c5dac07460d59c370790 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
from __future__ import print_function

import logging
import os
import shutil
import stat
import tempfile

import six
import yaml

from cloudinit import importer, util
from . import helpers

try:
    from unittest import mock
except ImportError:
    import mock


class FakeSelinux(object):

    def __init__(self, match_what):
        self.match_what = match_what
        self.restored = []

    def matchpathcon(self, path, mode):
        if path == self.match_what:
            return
        else:
            raise OSError("No match!")

    def is_selinux_enabled(self):
        return True

    def restorecon(self, path, recursive):
        self.restored.append(path)


class TestGetCfgOptionListOrStr(helpers.TestCase):
    def test_not_found_no_default(self):
        """None is returned if key is not found and no default given."""
        config = {}
        result = util.get_cfg_option_list(config, "key")
        self.assertEqual(None, result)

    def test_not_found_with_default(self):
        """Default is returned if key is not found."""
        config = {}
        result = util.get_cfg_option_list(config, "key", default=["DEFAULT"])
        self.assertEqual(["DEFAULT"], result)

    def test_found_with_default(self):
        """Default is not returned if key is found."""
        config = {"key": ["value1"]}
        result = util.get_cfg_option_list(config, "key", default=["DEFAULT"])
        self.assertEqual(["value1"], result)

    def test_found_convert_to_list(self):
        """Single string is converted to one element list."""
        config = {"key": "value1"}
        result = util.get_cfg_option_list(config, "key")
        self.assertEqual(["value1"], result)

    def test_value_is_none(self):
        """If value is None empty list is returned."""
        config = {"key": None}
        result = util.get_cfg_option_list(config, "key")
        self.assertEqual([], result)


class TestWriteFile(helpers.TestCase):
    def setUp(self):
        super(TestWriteFile, self).setUp()
        self.tmp = tempfile.mkdtemp()
        self.addCleanup(shutil.rmtree, self.tmp)

    def test_basic_usage(self):
        """Verify basic usage with default args."""
        path = os.path.join(self.tmp, "NewFile.txt")
        contents = "Hey there"

        util.write_file(path, contents)

        self.assertTrue(os.path.exists(path))
        self.assertTrue(os.path.isfile(path))
        with open(path) as f:
            create_contents = f.read()
            self.assertEqual(contents, create_contents)
        file_stat = os.stat(path)
        self.assertEqual(0o644, stat.S_IMODE(file_stat.st_mode))

    def test_dir_is_created_if_required(self):
        """Verifiy that directories are created is required."""
        dirname = os.path.join(self.tmp, "subdir")
        path = os.path.join(dirname, "NewFile.txt")
        contents = "Hey there"

        util.write_file(path, contents)

        self.assertTrue(os.path.isdir(dirname))
        self.assertTrue(os.path.isfile(path))

    def test_custom_mode(self):
        """Verify custom mode works properly."""
        path = os.path.join(self.tmp, "NewFile.txt")
        contents = "Hey there"

        util.write_file(path, contents, mode=0o666)

        self.assertTrue(os.path.exists(path))
        self.assertTrue(os.path.isfile(path))
        file_stat = os.stat(path)
        self.assertEqual(0o666, stat.S_IMODE(file_stat.st_mode))

    def test_custom_omode(self):
        """Verify custom omode works properly."""
        path = os.path.join(self.tmp, "NewFile.txt")
        contents = "Hey there"

        # Create file first with basic content
        with open(path, "wb") as f:
            f.write(b"LINE1\n")
        util.write_file(path, contents, omode="a")

        self.assertTrue(os.path.exists(path))
        self.assertTrue(os.path.isfile(path))
        with open(path) as f:
            create_contents = f.read()
            self.assertEqual("LINE1\nHey there", create_contents)

    def test_restorecon_if_possible_is_called(self):
        """Make sure the selinux guard is called correctly."""
        my_file = os.path.join(self.tmp, "my_file")
        with open(my_file, "w") as fp:
            fp.write("My Content")

        fake_se = FakeSelinux(my_file)

        with mock.patch.object(importer, 'import_module',
                               return_value=fake_se) as mockobj:
            with util.SeLinuxGuard(my_file) as is_on:
                self.assertTrue(is_on)

        self.assertEqual(1, len(fake_se.restored))
        self.assertEqual(my_file, fake_se.restored[0])

        mockobj.assert_called_once_with('selinux')


class TestDeleteDirContents(helpers.TestCase):
    def setUp(self):
        super(TestDeleteDirContents, self).setUp()
        self.tmp = tempfile.mkdtemp()
        self.addCleanup(shutil.rmtree, self.tmp)

    def assertDirEmpty(self, dirname):
        self.assertEqual([], os.listdir(dirname))

    def test_does_not_delete_dir(self):
        """Ensure directory itself is not deleted."""
        util.delete_dir_contents(self.tmp)

        self.assertTrue(os.path.isdir(self.tmp))
        self.assertDirEmpty(self.tmp)

    def test_deletes_files(self):
        """Single file should be deleted."""
        with open(os.path.join(self.tmp, "new_file.txt"), "wb") as f:
            f.write(b"DELETE ME")

        util.delete_dir_contents(self.tmp)

        self.assertDirEmpty(self.tmp)

    def test_deletes_empty_dirs(self):
        """Empty directories should be deleted."""
        os.mkdir(os.path.join(self.tmp, "new_dir"))

        util.delete_dir_contents(self.tmp)

        self.assertDirEmpty(self.tmp)

    def test_deletes_nested_dirs(self):
        """Nested directories should be deleted."""
        os.mkdir(os.path.join(self.tmp, "new_dir"))
        os.mkdir(os.path.join(self.tmp, "new_dir", "new_subdir"))

        util.delete_dir_contents(self.tmp)

        self.assertDirEmpty(self.tmp)

    def test_deletes_non_empty_dirs(self):
        """Non-empty directories should be deleted."""
        os.mkdir(os.path.join(self.tmp, "new_dir"))
        f_name = os.path.join(self.tmp, "new_dir", "new_file.txt")
        with open(f_name, "wb") as f:
            f.write(b"DELETE ME")

        util.delete_dir_contents(self.tmp)

        self.assertDirEmpty(self.tmp)

    def test_deletes_symlinks(self):
        """Symlinks should be deleted."""
        file_name = os.path.join(self.tmp, "new_file.txt")
        link_name = os.path.join(self.tmp, "new_file_link.txt")
        with open(file_name, "wb") as f:
            f.write(b"DELETE ME")
        os.symlink(file_name, link_name)

        util.delete_dir_contents(self.tmp)

        self.assertDirEmpty(self.tmp)


class TestKeyValStrings(helpers.TestCase):
    def test_keyval_str_to_dict(self):
        expected = {'1': 'one', '2': 'one+one', 'ro': True}
        cmdline = "1=one ro 2=one+one"
        self.assertEqual(expected, util.keyval_str_to_dict(cmdline))


class TestGetCmdline(helpers.TestCase):
    def test_cmdline_reads_debug_env(self):
        with mock.patch.dict("os.environ",
                             values={'DEBUG_PROC_CMDLINE': 'abcd 123'}):
            ret = util.get_cmdline()
        self.assertEqual("abcd 123", ret)


class TestLoadYaml(helpers.TestCase):
    mydefault = "7b03a8ebace993d806255121073fed52"

    def test_simple(self):
        mydata = {'1': "one", '2': "two"}
        self.assertEqual(util.load_yaml(yaml.dump(mydata)), mydata)

    def test_nonallowed_returns_default(self):
        # for now, anything not in the allowed list just returns the default.
        myyaml = yaml.dump({'1': "one"})
        self.assertEqual(util.load_yaml(blob=myyaml,
                                        default=self.mydefault,
                                        allowed=(str,)),
                         self.mydefault)

    def test_bogus_returns_default(self):
        badyaml = "1\n 2:"
        self.assertEqual(util.load_yaml(blob=badyaml,
                                        default=self.mydefault),
                         self.mydefault)

    def test_unsafe_types(self):
        # should not load complex types
        unsafe_yaml = yaml.dump((1, 2, 3,))
        self.assertEqual(util.load_yaml(blob=unsafe_yaml,
                                        default=self.mydefault),
                         self.mydefault)

    def test_python_unicode(self):
        # complex type of python/unicode is explicitly allowed
        myobj = {'1': six.text_type("FOOBAR")}
        safe_yaml = yaml.dump(myobj)
        self.assertEqual(util.load_yaml(blob=safe_yaml,
                                        default=self.mydefault),
                         myobj)


class TestMountinfoParsing(helpers.ResourceUsingTestCase):
    def test_invalid_mountinfo(self):
        line = ("20 1 252:1 / / rw,relatime - ext4 /dev/mapper/vg0-root"
                "rw,errors=remount-ro,data=ordered")
        elements = line.split()
        for i in range(len(elements) + 1):
            lines = [' '.join(elements[0:i])]
            if i < 10:
                expected = None
            else:
                expected = ('/dev/mapper/vg0-root', 'ext4', '/')
            self.assertEqual(expected, util.parse_mount_info('/', lines))

    def test_precise_ext4_root(self):

        lines = self.readResource('mountinfo_precise_ext4.txt').splitlines()

        expected = ('/dev/mapper/vg0-root', 'ext4', '/')
        self.assertEqual(expected, util.parse_mount_info('/', lines))
        self.assertEqual(expected, util.parse_mount_info('/usr', lines))
        self.assertEqual(expected, util.parse_mount_info('/usr/bin', lines))

        expected = ('/dev/md0', 'ext4', '/boot')
        self.assertEqual(expected, util.parse_mount_info('/boot', lines))
        self.assertEqual(expected, util.parse_mount_info('/boot/grub', lines))

        expected = ('/dev/mapper/vg0-root', 'ext4', '/')
        self.assertEqual(expected, util.parse_mount_info('/home', lines))
        self.assertEqual(expected, util.parse_mount_info('/home/me', lines))

        expected = ('tmpfs', 'tmpfs', '/run')
        self.assertEqual(expected, util.parse_mount_info('/run', lines))

        expected = ('none', 'tmpfs', '/run/lock')
        self.assertEqual(expected, util.parse_mount_info('/run/lock', lines))

    def test_raring_btrfs_root(self):
        lines = self.readResource('mountinfo_raring_btrfs.txt').splitlines()

        expected = ('/dev/vda1', 'btrfs', '/')
        self.assertEqual(expected, util.parse_mount_info('/', lines))
        self.assertEqual(expected, util.parse_mount_info('/usr', lines))
        self.assertEqual(expected, util.parse_mount_info('/usr/bin', lines))
        self.assertEqual(expected, util.parse_mount_info('/boot', lines))
        self.assertEqual(expected, util.parse_mount_info('/boot/grub', lines))

        expected = ('/dev/vda1', 'btrfs', '/home')
        self.assertEqual(expected, util.parse_mount_info('/home', lines))
        self.assertEqual(expected, util.parse_mount_info('/home/me', lines))

        expected = ('tmpfs', 'tmpfs', '/run')
        self.assertEqual(expected, util.parse_mount_info('/run', lines))

        expected = ('none', 'tmpfs', '/run/lock')
        self.assertEqual(expected, util.parse_mount_info('/run/lock', lines))


class TestReadDMIData(helpers.FilesystemMockingTestCase):

    def setUp(self):
        super(TestReadDMIData, self).setUp()
        self.new_root = tempfile.mkdtemp()
        self.addCleanup(shutil.rmtree, self.new_root)
        self.patchOS(self.new_root)
        self.patchUtils(self.new_root)

    def _create_sysfs_parent_directory(self):
        util.ensure_dir(os.path.join('sys', 'class', 'dmi', 'id'))

    def _create_sysfs_file(self, key, content):
        """Mocks the sys path found on Linux systems."""
        self._create_sysfs_parent_directory()
        dmi_key = "/sys/class/dmi/id/{0}".format(key)
        util.write_file(dmi_key, content)

    def _configure_dmidecode_return(self, key, content, error=None):
        """
        In order to test a missing sys path and call outs to dmidecode, this
        function fakes the results of dmidecode to test the results.
        """
        def _dmidecode_subp(cmd):
            if cmd[-1] != key:
                raise util.ProcessExecutionError()
            return (content, error)

        self.patched_funcs.enter_context(
            mock.patch.object(util, 'which', lambda _: True))
        self.patched_funcs.enter_context(
            mock.patch.object(util, 'subp', _dmidecode_subp))

    def patch_mapping(self, new_mapping):
        self.patched_funcs.enter_context(
            mock.patch('cloudinit.util.DMIDECODE_TO_DMI_SYS_MAPPING',
                       new_mapping))

    def test_sysfs_used_with_key_in_mapping_and_file_on_disk(self):
        self.patch_mapping({'mapped-key': 'mapped-value'})
        expected_dmi_value = 'sys-used-correctly'
        self._create_sysfs_file('mapped-value', expected_dmi_value)
        self._configure_dmidecode_return('mapped-key', 'wrong-wrong-wrong')
        self.assertEqual(expected_dmi_value, util.read_dmi_data('mapped-key'))

    def test_dmidecode_used_if_no_sysfs_file_on_disk(self):
        self.patch_mapping({})
        self._create_sysfs_parent_directory()
        expected_dmi_value = 'dmidecode-used'
        self._configure_dmidecode_return('use-dmidecode', expected_dmi_value)
        with mock.patch("cloudinit.util.os.uname") as m_uname:
            m_uname.return_value = ('x-sysname', 'x-nodename',
                                    'x-release', 'x-version', 'x86_64')
            self.assertEqual(expected_dmi_value,
                             util.read_dmi_data('use-dmidecode'))

    def test_dmidecode_not_used_on_arm(self):
        self.patch_mapping({})
        self._create_sysfs_parent_directory()
        dmi_val = 'from-dmidecode'
        dmi_name = 'use-dmidecode'
        self._configure_dmidecode_return(dmi_name, dmi_val)

        expected = {'armel': None, 'aarch64': None, 'x86_64': dmi_val}
        found = {}
        # we do not run the 'dmi-decode' binary on some arches
        # verify that anything requested that is not in the sysfs dir
        # will return None on those arches.
        with mock.patch("cloudinit.util.os.uname") as m_uname:
            for arch in expected:
                m_uname.return_value = ('x-sysname', 'x-nodename',
                                        'x-release', 'x-version', arch)
                found[arch] = util.read_dmi_data(dmi_name)
        self.assertEqual(expected, found)

    def test_none_returned_if_neither_source_has_data(self):
        self.patch_mapping({})
        self._configure_dmidecode_return('key', 'value')
        self.assertEqual(None, util.read_dmi_data('expect-fail'))

    def test_none_returned_if_dmidecode_not_in_path(self):
        self.patched_funcs.enter_context(
            mock.patch.object(util, 'which', lambda _: False))
        self.patch_mapping({})
        self.assertEqual(None, util.read_dmi_data('expect-fail'))

    def test_dots_returned_instead_of_foxfox(self):
        # uninitialized dmi values show as \xff, return those as .
        my_len = 32
        dmi_value = b'\xff' * my_len + b'\n'
        expected = ""
        dmi_key = 'system-product-name'
        sysfs_key = 'product_name'
        self._create_sysfs_file(sysfs_key, dmi_value)
        self.assertEqual(expected, util.read_dmi_data(dmi_key))


class TestMultiLog(helpers.FilesystemMockingTestCase):

    def _createConsole(self, root):
        os.mkdir(os.path.join(root, 'dev'))
        open(os.path.join(root, 'dev', 'console'), 'a').close()

    def setUp(self):
        super(TestMultiLog, self).setUp()
        self.root = tempfile.mkdtemp()
        self.addCleanup(shutil.rmtree, self.root)
        self.patchOS(self.root)
        self.patchUtils(self.root)
        self.patchOpen(self.root)
        self.stdout = six.StringIO()
        self.stderr = six.StringIO()
        self.patchStdoutAndStderr(self.stdout, self.stderr)

    def test_stderr_used_by_default(self):
        logged_string = 'test stderr output'
        util.multi_log(logged_string)
        self.assertEqual(logged_string, self.stderr.getvalue())

    def test_stderr_not_used_if_false(self):
        util.multi_log('should not see this', stderr=False)
        self.assertEqual('', self.stderr.getvalue())

    def test_logs_go_to_console_by_default(self):
        self._createConsole(self.root)
        logged_string = 'something very important'
        util.multi_log(logged_string)
        self.assertEqual(logged_string, open('/dev/console').read())

    def test_logs_dont_go_to_stdout_if_console_exists(self):
        self._createConsole(self.root)
        util.multi_log('something')
        self.assertEqual('', self.stdout.getvalue())

    def test_logs_go_to_stdout_if_console_does_not_exist(self):
        logged_string = 'something very important'
        util.multi_log(logged_string)
        self.assertEqual(logged_string, self.stdout.getvalue())

    def test_logs_go_to_log_if_given(self):
        log = mock.MagicMock()
        logged_string = 'something very important'
        util.multi_log(logged_string, log=log)
        self.assertEqual([((mock.ANY, logged_string), {})],
                         log.log.call_args_list)

    def test_newlines_stripped_from_log_call(self):
        log = mock.MagicMock()
        expected_string = 'something very important'
        util.multi_log('{0}\n'.format(expected_string), log=log)
        self.assertEqual((mock.ANY, expected_string), log.log.call_args[0])

    def test_log_level_defaults_to_debug(self):
        log = mock.MagicMock()
        util.multi_log('message', log=log)
        self.assertEqual((logging.DEBUG, mock.ANY), log.log.call_args[0])

    def test_given_log_level_used(self):
        log = mock.MagicMock()
        log_level = mock.Mock()
        util.multi_log('message', log=log, log_level=log_level)
        self.assertEqual((log_level, mock.ANY), log.log.call_args[0])


class TestMessageFromString(helpers.TestCase):

    def test_unicode_not_messed_up(self):
        roundtripped = util.message_from_string(u'\n').as_string()
        self.assertNotIn('\x00', roundtripped)


class TestReadSeeded(helpers.TestCase):
    def setUp(self):
        super(TestReadSeeded, self).setUp()
        self.tmp = tempfile.mkdtemp()
        self.addCleanup(shutil.rmtree, self.tmp)

    def test_unicode_not_messed_up(self):
        ud = b"userdatablob"
        helpers.populate_dir(
            self.tmp, {'meta-data': "key1: val1", 'user-data': ud})
        sdir = self.tmp + os.path.sep
        (found_md, found_ud) = util.read_seeded(sdir)

        self.assertEqual(found_md, {'key1': 'val1'})
        self.assertEqual(found_ud, ud)


class TestSubp(helpers.TestCase):

    stdin2err = ['bash', '-c', 'cat >&2']
    stdin2out = ['cat']
    utf8_invalid = b'ab\xaadef'
    utf8_valid = b'start \xc3\xa9 end'
    utf8_valid_2 = b'd\xc3\xa9j\xc8\xa7'
    printenv = ['bash', '-c', 'for n in "$@"; do echo "$n=${!n}"; done', '--']

    def printf_cmd(self, *args):
        # bash's printf supports \xaa.  So does /usr/bin/printf
        # but by using bash, we remove dependency on another program.
        return(['bash', '-c', 'printf "$@"', 'printf'] + list(args))

    def test_subp_handles_utf8(self):
        # The given bytes contain utf-8 accented characters as seen in e.g.
        # the "deja dup" package in Ubuntu.
        cmd = self.printf_cmd(self.utf8_valid_2)
        (out, _err) = util.subp(cmd, capture=True)
        self.assertEqual(out, self.utf8_valid_2.decode('utf-8'))

    def test_subp_respects_decode_false(self):
        (out, err) = util.subp(self.stdin2out, capture=True, decode=False,
                               data=self.utf8_valid)
        self.assertTrue(isinstance(out, bytes))
        self.assertTrue(isinstance(err, bytes))
        self.assertEqual(out, self.utf8_valid)

    def test_subp_decode_ignore(self):
        # this executes a string that writes invalid utf-8 to stdout
        (out, _err) = util.subp(self.printf_cmd('abc\\xaadef'),
                                capture=True, decode='ignore')
        self.assertEqual(out, 'abcdef')

    def test_subp_decode_strict_valid_utf8(self):
        (out, _err) = util.subp(self.stdin2out, capture=True,
                                decode='strict', data=self.utf8_valid)
        self.assertEqual(out, self.utf8_valid.decode('utf-8'))

    def test_subp_decode_invalid_utf8_replaces(self):
        (out, _err) = util.subp(self.stdin2out, capture=True,
                                data=self.utf8_invalid)
        expected = self.utf8_invalid.decode('utf-8', errors='replace')
        self.assertEqual(out, expected)

    def test_subp_decode_strict_raises(self):
        args = []
        kwargs = {'args': self.stdin2out, 'capture': True,
                  'decode': 'strict', 'data': self.utf8_invalid}
        self.assertRaises(UnicodeDecodeError, util.subp, *args, **kwargs)

    def test_subp_capture_stderr(self):
        data = b'hello world'
        (out, err) = util.subp(self.stdin2err, capture=True,
                               decode=False, data=data)
        self.assertEqual(err, data)
        self.assertEqual(out, b'')

    def test_subp_reads_env(self):
        with mock.patch.dict("os.environ", values={'FOO': 'BAR'}):
            out, err = util.subp(self.printenv + ['FOO'], capture=True)
        self.assertEqual('FOO=BAR', out.splitlines()[0])

    def test_subp_env_and_update_env(self):
        out, err = util.subp(
            self.printenv + ['FOO', 'HOME', 'K1', 'K2'], capture=True,
            env={'FOO': 'BAR'},
            update_env={'HOME': '/myhome', 'K2': 'V2'})
        self.assertEqual(
            ['FOO=BAR', 'HOME=/myhome', 'K1=', 'K2=V2'], out.splitlines())

    def test_subp_update_env(self):
        extra = {'FOO': 'BAR', 'HOME': '/root', 'K1': 'V1'}
        with mock.patch.dict("os.environ", values=extra):
            out, err = util.subp(
                self.printenv + ['FOO', 'HOME', 'K1', 'K2'], capture=True,
                update_env={'HOME': '/myhome', 'K2': 'V2'})

        self.assertEqual(
            ['FOO=BAR', 'HOME=/myhome', 'K1=V1', 'K2=V2'], out.splitlines())

    def test_returns_none_if_no_capture(self):
        (out, err) = util.subp(self.stdin2out, data=b'', capture=False)
        self.assertEqual(err, None)
        self.assertEqual(out, None)

    def test_bunch_of_slashes_in_path(self):
        self.assertEqual("/target/my/path/",
                         util.target_path("/target/", "//my/path/"))
        self.assertEqual("/target/my/path/",
                         util.target_path("/target/", "///my/path/"))


class TestEncode(helpers.TestCase):
    """Test the encoding functions"""
    def test_decode_binary_plain_text_with_hex(self):
        blob = 'BOOTABLE_FLAG=\x80init=/bin/systemd'
        text = util.decode_binary(blob)
        self.assertEqual(text, blob)

# vi: ts=4 expandtab