summaryrefslogtreecommitdiff
path: root/cloudinit/sources/tests/test_init.py
blob: 8082019e29a5ed70abba6f8815b9dac0774871b7 (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
# This file is part of cloud-init. See LICENSE file for license information.

import copy
import inspect
import os
import six
import stat

from cloudinit.event import EventType
from cloudinit.helpers import Paths
from cloudinit import importer
from cloudinit.sources import (
    EXPERIMENTAL_TEXT, INSTANCE_JSON_FILE, INSTANCE_JSON_SENSITIVE_FILE,
    REDACT_SENSITIVE_VALUE, UNSET, DataSource, redact_sensitive_keys)
from cloudinit.tests.helpers import CiTestCase, skipIf, mock
from cloudinit.user_data import UserDataProcessor
from cloudinit import util


class DataSourceTestSubclassNet(DataSource):

    dsname = 'MyTestSubclass'
    url_max_wait = 55

    def __init__(self, sys_cfg, distro, paths, custom_metadata=None,
                 custom_userdata=None, get_data_retval=True):
        super(DataSourceTestSubclassNet, self).__init__(
            sys_cfg, distro, paths)
        self._custom_userdata = custom_userdata
        self._custom_metadata = custom_metadata
        self._get_data_retval = get_data_retval

    def _get_cloud_name(self):
        return 'SubclassCloudName'

    def _get_data(self):
        if self._custom_metadata:
            self.metadata = self._custom_metadata
        else:
            self.metadata = {'availability_zone': 'myaz',
                             'local-hostname': 'test-subclass-hostname',
                             'region': 'myregion'}
        if self._custom_userdata:
            self.userdata_raw = self._custom_userdata
        else:
            self.userdata_raw = 'userdata_raw'
        self.vendordata_raw = 'vendordata_raw'
        return self._get_data_retval


class InvalidDataSourceTestSubclassNet(DataSource):
    pass


class TestDataSource(CiTestCase):

    with_logs = True

    def setUp(self):
        super(TestDataSource, self).setUp()
        self.sys_cfg = {'datasource': {'_undef': {'key1': False}}}
        self.distro = 'distrotest'  # generally should be a Distro object
        self.paths = Paths({})
        self.datasource = DataSource(self.sys_cfg, self.distro, self.paths)

    def test_datasource_init(self):
        """DataSource initializes metadata attributes, ds_cfg and ud_proc."""
        self.assertEqual(self.paths, self.datasource.paths)
        self.assertEqual(self.sys_cfg, self.datasource.sys_cfg)
        self.assertEqual(self.distro, self.datasource.distro)
        self.assertIsNone(self.datasource.userdata)
        self.assertEqual({}, self.datasource.metadata)
        self.assertIsNone(self.datasource.userdata_raw)
        self.assertIsNone(self.datasource.vendordata)
        self.assertIsNone(self.datasource.vendordata_raw)
        self.assertEqual({'key1': False}, self.datasource.ds_cfg)
        self.assertIsInstance(self.datasource.ud_proc, UserDataProcessor)

    def test_datasource_init_gets_ds_cfg_using_dsname(self):
        """Init uses DataSource.dsname for sourcing ds_cfg."""
        sys_cfg = {'datasource': {'MyTestSubclass': {'key2': False}}}
        distro = 'distrotest'  # generally should be a Distro object
        datasource = DataSourceTestSubclassNet(sys_cfg, distro, self.paths)
        self.assertEqual({'key2': False}, datasource.ds_cfg)

    def test_str_is_classname(self):
        """The string representation of the datasource is the classname."""
        self.assertEqual('DataSource', str(self.datasource))
        self.assertEqual(
            'DataSourceTestSubclassNet',
            str(DataSourceTestSubclassNet('', '', self.paths)))

    def test_datasource_get_url_params_defaults(self):
        """get_url_params default url config settings for the datasource."""
        params = self.datasource.get_url_params()
        self.assertEqual(params.max_wait_seconds, self.datasource.url_max_wait)
        self.assertEqual(params.timeout_seconds, self.datasource.url_timeout)
        self.assertEqual(params.num_retries, self.datasource.url_retries)

    def test_datasource_get_url_params_subclassed(self):
        """Subclasses can override get_url_params defaults."""
        sys_cfg = {'datasource': {'MyTestSubclass': {'key2': False}}}
        distro = 'distrotest'  # generally should be a Distro object
        datasource = DataSourceTestSubclassNet(sys_cfg, distro, self.paths)
        expected = (datasource.url_max_wait, datasource.url_timeout,
                    datasource.url_retries)
        url_params = datasource.get_url_params()
        self.assertNotEqual(self.datasource.get_url_params(), url_params)
        self.assertEqual(expected, url_params)

    def test_datasource_get_url_params_ds_config_override(self):
        """Datasource configuration options can override url param defaults."""
        sys_cfg = {
            'datasource': {
                'MyTestSubclass': {
                    'max_wait': '1', 'timeout': '2', 'retries': '3'}}}
        datasource = DataSourceTestSubclassNet(
            sys_cfg, self.distro, self.paths)
        expected = (1, 2, 3)
        url_params = datasource.get_url_params()
        self.assertNotEqual(
            (datasource.url_max_wait, datasource.url_timeout,
             datasource.url_retries),
            url_params)
        self.assertEqual(expected, url_params)

    def test_datasource_get_url_params_is_zero_or_greater(self):
        """get_url_params ignores timeouts with a value below 0."""
        # Set an override that is below 0 which gets ignored.
        sys_cfg = {'datasource': {'_undef': {'timeout': '-1'}}}
        datasource = DataSource(sys_cfg, self.distro, self.paths)
        (_max_wait, timeout, _retries) = datasource.get_url_params()
        self.assertEqual(0, timeout)

    def test_datasource_get_url_uses_defaults_on_errors(self):
        """On invalid system config values for url_params defaults are used."""
        # All invalid values should be logged
        sys_cfg = {'datasource': {
            '_undef': {
                'max_wait': 'nope', 'timeout': 'bug', 'retries': 'nonint'}}}
        datasource = DataSource(sys_cfg, self.distro, self.paths)
        url_params = datasource.get_url_params()
        expected = (datasource.url_max_wait, datasource.url_timeout,
                    datasource.url_retries)
        self.assertEqual(expected, url_params)
        logs = self.logs.getvalue()
        expected_logs = [
            "Config max_wait 'nope' is not an int, using default '-1'",
            "Config timeout 'bug' is not an int, using default '10'",
            "Config retries 'nonint' is not an int, using default '5'",
        ]
        for log in expected_logs:
            self.assertIn(log, logs)

    @mock.patch('cloudinit.sources.net.find_fallback_nic')
    def test_fallback_interface_is_discovered(self, m_get_fallback_nic):
        """The fallback_interface is discovered via find_fallback_nic."""
        m_get_fallback_nic.return_value = 'nic9'
        self.assertEqual('nic9', self.datasource.fallback_interface)

    @mock.patch('cloudinit.sources.net.find_fallback_nic')
    def test_fallback_interface_logs_undiscovered(self, m_get_fallback_nic):
        """Log a warning when fallback_interface can not discover the nic."""
        self.datasource._cloud_name = 'MySupahCloud'
        m_get_fallback_nic.return_value = None  # Couldn't discover nic
        self.assertIsNone(self.datasource.fallback_interface)
        self.assertEqual(
            'WARNING: Did not find a fallback interface on MySupahCloud.\n',
            self.logs.getvalue())

    @mock.patch('cloudinit.sources.net.find_fallback_nic')
    def test_wb_fallback_interface_is_cached(self, m_get_fallback_nic):
        """The fallback_interface is cached and won't be rediscovered."""
        self.datasource._fallback_interface = 'nic10'
        self.assertEqual('nic10', self.datasource.fallback_interface)
        m_get_fallback_nic.assert_not_called()

    def test__get_data_unimplemented(self):
        """Raise an error when _get_data is not implemented."""
        with self.assertRaises(NotImplementedError) as context_manager:
            self.datasource.get_data()
        self.assertIn(
            'Subclasses of DataSource must implement _get_data',
            str(context_manager.exception))
        datasource2 = InvalidDataSourceTestSubclassNet(
            self.sys_cfg, self.distro, self.paths)
        with self.assertRaises(NotImplementedError) as context_manager:
            datasource2.get_data()
        self.assertIn(
            'Subclasses of DataSource must implement _get_data',
            str(context_manager.exception))

    def test_get_data_calls_subclass__get_data(self):
        """Datasource.get_data uses the subclass' version of _get_data."""
        tmp = self.tmp_dir()
        datasource = DataSourceTestSubclassNet(
            self.sys_cfg, self.distro, Paths({'run_dir': tmp}))
        self.assertTrue(datasource.get_data())
        self.assertEqual(
            {'availability_zone': 'myaz',
             'local-hostname': 'test-subclass-hostname',
             'region': 'myregion'},
            datasource.metadata)
        self.assertEqual('userdata_raw', datasource.userdata_raw)
        self.assertEqual('vendordata_raw', datasource.vendordata_raw)

    def test_get_hostname_strips_local_hostname_without_domain(self):
        """Datasource.get_hostname strips metadata local-hostname of domain."""
        tmp = self.tmp_dir()
        datasource = DataSourceTestSubclassNet(
            self.sys_cfg, self.distro, Paths({'run_dir': tmp}))
        self.assertTrue(datasource.get_data())
        self.assertEqual(
            'test-subclass-hostname', datasource.metadata['local-hostname'])
        self.assertEqual('test-subclass-hostname', datasource.get_hostname())
        datasource.metadata['local-hostname'] = 'hostname.my.domain.com'
        self.assertEqual('hostname', datasource.get_hostname())

    def test_get_hostname_with_fqdn_returns_local_hostname_with_domain(self):
        """Datasource.get_hostname with fqdn set gets qualified hostname."""
        tmp = self.tmp_dir()
        datasource = DataSourceTestSubclassNet(
            self.sys_cfg, self.distro, Paths({'run_dir': tmp}))
        self.assertTrue(datasource.get_data())
        datasource.metadata['local-hostname'] = 'hostname.my.domain.com'
        self.assertEqual(
            'hostname.my.domain.com', datasource.get_hostname(fqdn=True))

    def test_get_hostname_without_metadata_uses_system_hostname(self):
        """Datasource.gethostname runs util.get_hostname when no metadata."""
        tmp = self.tmp_dir()
        datasource = DataSourceTestSubclassNet(
            self.sys_cfg, self.distro, Paths({'run_dir': tmp}))
        self.assertEqual({}, datasource.metadata)
        mock_fqdn = 'cloudinit.sources.util.get_fqdn_from_hosts'
        with mock.patch('cloudinit.sources.util.get_hostname') as m_gethost:
            with mock.patch(mock_fqdn) as m_fqdn:
                m_gethost.return_value = 'systemhostname.domain.com'
                m_fqdn.return_value = None  # No maching fqdn in /etc/hosts
                self.assertEqual('systemhostname', datasource.get_hostname())
                self.assertEqual(
                    'systemhostname.domain.com',
                    datasource.get_hostname(fqdn=True))

    def test_get_hostname_without_metadata_returns_none(self):
        """Datasource.gethostname returns None when metadata_only and no MD."""
        tmp = self.tmp_dir()
        datasource = DataSourceTestSubclassNet(
            self.sys_cfg, self.distro, Paths({'run_dir': tmp}))
        self.assertEqual({}, datasource.metadata)
        mock_fqdn = 'cloudinit.sources.util.get_fqdn_from_hosts'
        with mock.patch('cloudinit.sources.util.get_hostname') as m_gethost:
            with mock.patch(mock_fqdn) as m_fqdn:
                self.assertIsNone(datasource.get_hostname(metadata_only=True))
                self.assertIsNone(
                    datasource.get_hostname(fqdn=True, metadata_only=True))
        self.assertEqual([], m_gethost.call_args_list)
        self.assertEqual([], m_fqdn.call_args_list)

    def test_get_hostname_without_metadata_prefers_etc_hosts(self):
        """Datasource.gethostname prefers /etc/hosts to util.get_hostname."""
        tmp = self.tmp_dir()
        datasource = DataSourceTestSubclassNet(
            self.sys_cfg, self.distro, Paths({'run_dir': tmp}))
        self.assertEqual({}, datasource.metadata)
        mock_fqdn = 'cloudinit.sources.util.get_fqdn_from_hosts'
        with mock.patch('cloudinit.sources.util.get_hostname') as m_gethost:
            with mock.patch(mock_fqdn) as m_fqdn:
                m_gethost.return_value = 'systemhostname.domain.com'
                m_fqdn.return_value = 'fqdnhostname.domain.com'
                self.assertEqual('fqdnhostname', datasource.get_hostname())
                self.assertEqual('fqdnhostname.domain.com',
                                 datasource.get_hostname(fqdn=True))

    def test_get_data_does_not_write_instance_data_on_failure(self):
        """get_data does not write INSTANCE_JSON_FILE on get_data False."""
        tmp = self.tmp_dir()
        datasource = DataSourceTestSubclassNet(
            self.sys_cfg, self.distro, Paths({'run_dir': tmp}),
            get_data_retval=False)
        self.assertFalse(datasource.get_data())
        json_file = self.tmp_path(INSTANCE_JSON_FILE, tmp)
        self.assertFalse(
            os.path.exists(json_file), 'Found unexpected file %s' % json_file)

    def test_get_data_writes_json_instance_data_on_success(self):
        """get_data writes INSTANCE_JSON_FILE to run_dir as world readable."""
        tmp = self.tmp_dir()
        datasource = DataSourceTestSubclassNet(
            self.sys_cfg, self.distro, Paths({'run_dir': tmp}))
        datasource.get_data()
        json_file = self.tmp_path(INSTANCE_JSON_FILE, tmp)
        content = util.load_file(json_file)
        expected = {
            'base64_encoded_keys': [],
            'sensitive_keys': [],
            'v1': {
                'availability-zone': 'myaz',
                'availability_zone': 'myaz',
                'cloud-name': 'subclasscloudname',
                'cloud_name': 'subclasscloudname',
                'instance-id': 'iid-datasource',
                'instance_id': 'iid-datasource',
                'local-hostname': 'test-subclass-hostname',
                'local_hostname': 'test-subclass-hostname',
                'region': 'myregion'},
            'ds': {
                '_doc': EXPERIMENTAL_TEXT,
                'meta_data': {'availability_zone': 'myaz',
                              'local-hostname': 'test-subclass-hostname',
                              'region': 'myregion'}}}
        self.assertEqual(expected, util.load_json(content))
        file_stat = os.stat(json_file)
        self.assertEqual(0o644, stat.S_IMODE(file_stat.st_mode))
        self.assertEqual(expected, util.load_json(content))

    def test_get_data_writes_json_instance_data_sensitive(self):
        """get_data writes INSTANCE_JSON_SENSITIVE_FILE as readonly root."""
        tmp = self.tmp_dir()
        datasource = DataSourceTestSubclassNet(
            self.sys_cfg, self.distro, Paths({'run_dir': tmp}),
            custom_metadata={
                'availability_zone': 'myaz',
                'local-hostname': 'test-subclass-hostname',
                'region': 'myregion',
                'some': {'security-credentials': {
                    'cred1': 'sekret', 'cred2': 'othersekret'}}})
        self.assertEqual(
            ('security-credentials',), datasource.sensitive_metadata_keys)
        datasource.get_data()
        json_file = self.tmp_path(INSTANCE_JSON_FILE, tmp)
        sensitive_json_file = self.tmp_path(INSTANCE_JSON_SENSITIVE_FILE, tmp)
        redacted = util.load_json(util.load_file(json_file))
        self.assertEqual(
            {'cred1': 'sekret', 'cred2': 'othersekret'},
            redacted['ds']['meta_data']['some']['security-credentials'])
        content = util.load_file(sensitive_json_file)
        expected = {
            'base64_encoded_keys': [],
            'sensitive_keys': ['ds/meta_data/some/security-credentials'],
            'v1': {
                'availability-zone': 'myaz',
                'availability_zone': 'myaz',
                'cloud-name': 'subclasscloudname',
                'cloud_name': 'subclasscloudname',
                'instance-id': 'iid-datasource',
                'instance_id': 'iid-datasource',
                'local-hostname': 'test-subclass-hostname',
                'local_hostname': 'test-subclass-hostname',
                'region': 'myregion'},
            'ds': {
                '_doc': EXPERIMENTAL_TEXT,
                'meta_data': {
                    'availability_zone': 'myaz',
                    'local-hostname': 'test-subclass-hostname',
                    'region': 'myregion',
                    'some': {'security-credentials': REDACT_SENSITIVE_VALUE}}}
        }
        self.maxDiff = None
        self.assertEqual(expected, util.load_json(content))
        file_stat = os.stat(sensitive_json_file)
        self.assertEqual(0o600, stat.S_IMODE(file_stat.st_mode))
        self.assertEqual(expected, util.load_json(content))

    def test_get_data_handles_redacted_unserializable_content(self):
        """get_data warns unserializable content in INSTANCE_JSON_FILE."""
        tmp = self.tmp_dir()
        datasource = DataSourceTestSubclassNet(
            self.sys_cfg, self.distro, Paths({'run_dir': tmp}),
            custom_metadata={'key1': 'val1', 'key2': {'key2.1': self.paths}})
        datasource.get_data()
        json_file = self.tmp_path(INSTANCE_JSON_FILE, tmp)
        content = util.load_file(json_file)
        expected_metadata = {
            'key1': 'val1',
            'key2': {
                'key2.1': "Warning: redacted unserializable type <class"
                          " 'cloudinit.helpers.Paths'>"}}
        instance_json = util.load_json(content)
        self.assertEqual(
            expected_metadata, instance_json['ds']['meta_data'])

    def test_persist_instance_data_writes_ec2_metadata_when_set(self):
        """When ec2_metadata class attribute is set, persist to json."""
        tmp = self.tmp_dir()
        datasource = DataSourceTestSubclassNet(
            self.sys_cfg, self.distro, Paths({'run_dir': tmp}))
        datasource.ec2_metadata = UNSET
        datasource.get_data()
        json_file = self.tmp_path(INSTANCE_JSON_FILE, tmp)
        instance_data = util.load_json(util.load_file(json_file))
        self.assertNotIn('ec2_metadata', instance_data['ds'])
        datasource.ec2_metadata = {'ec2stuff': 'is good'}
        datasource.persist_instance_data()
        instance_data = util.load_json(util.load_file(json_file))
        self.assertEqual(
            {'ec2stuff': 'is good'},
            instance_data['ds']['ec2_metadata'])

    def test_persist_instance_data_writes_network_json_when_set(self):
        """When network_data.json class attribute is set, persist to json."""
        tmp = self.tmp_dir()
        datasource = DataSourceTestSubclassNet(
            self.sys_cfg, self.distro, Paths({'run_dir': tmp}))
        datasource.get_data()
        json_file = self.tmp_path(INSTANCE_JSON_FILE, tmp)
        instance_data = util.load_json(util.load_file(json_file))
        self.assertNotIn('network_json', instance_data['ds'])
        datasource.network_json = {'network_json': 'is good'}
        datasource.persist_instance_data()
        instance_data = util.load_json(util.load_file(json_file))
        self.assertEqual(
            {'network_json': 'is good'},
            instance_data['ds']['network_json'])

    @skipIf(not six.PY3, "json serialization on <= py2.7 handles bytes")
    def test_get_data_base64encodes_unserializable_bytes(self):
        """On py3, get_data base64encodes any unserializable content."""
        tmp = self.tmp_dir()
        datasource = DataSourceTestSubclassNet(
            self.sys_cfg, self.distro, Paths({'run_dir': tmp}),
            custom_metadata={'key1': 'val1', 'key2': {'key2.1': b'\x123'}})
        self.assertTrue(datasource.get_data())
        json_file = self.tmp_path(INSTANCE_JSON_FILE, tmp)
        content = util.load_file(json_file)
        instance_json = util.load_json(content)
        self.assertItemsEqual(
            ['ds/meta_data/key2/key2.1'],
            instance_json['base64_encoded_keys'])
        self.assertEqual(
            {'key1': 'val1', 'key2': {'key2.1': 'EjM='}},
            instance_json['ds']['meta_data'])

    @skipIf(not six.PY2, "json serialization on <= py2.7 handles bytes")
    def test_get_data_handles_bytes_values(self):
        """On py2 get_data handles bytes values without having to b64encode."""
        tmp = self.tmp_dir()
        datasource = DataSourceTestSubclassNet(
            self.sys_cfg, self.distro, Paths({'run_dir': tmp}),
            custom_metadata={'key1': 'val1', 'key2': {'key2.1': b'\x123'}})
        self.assertTrue(datasource.get_data())
        json_file = self.tmp_path(INSTANCE_JSON_FILE, tmp)
        content = util.load_file(json_file)
        instance_json = util.load_json(content)
        self.assertEqual([], instance_json['base64_encoded_keys'])
        self.assertEqual(
            {'key1': 'val1', 'key2': {'key2.1': '\x123'}},
            instance_json['ds']['meta_data'])

    @skipIf(not six.PY2, "Only python2 hits UnicodeDecodeErrors on non-utf8")
    def test_non_utf8_encoding_logs_warning(self):
        """When non-utf-8 values exist in py2 instance-data is not written."""
        tmp = self.tmp_dir()
        datasource = DataSourceTestSubclassNet(
            self.sys_cfg, self.distro, Paths({'run_dir': tmp}),
            custom_metadata={'key1': 'val1', 'key2': {'key2.1': b'ab\xaadef'}})
        self.assertTrue(datasource.get_data())
        json_file = self.tmp_path(INSTANCE_JSON_FILE, tmp)
        self.assertFalse(os.path.exists(json_file))
        self.assertIn(
            "WARNING: Error persisting instance-data.json: 'utf8' codec can't"
            " decode byte 0xaa in position 2: invalid start byte",
            self.logs.getvalue())

    def test_get_hostname_subclass_support(self):
        """Validate get_hostname signature on all subclasses of DataSource."""
        # Use inspect.getfullargspec when we drop py2.6 and py2.7
        get_args = inspect.getargspec  # pylint: disable=W1505
        base_args = get_args(DataSource.get_hostname)  # pylint: disable=W1505
        # Import all DataSource subclasses so we can inspect them.
        modules = util.find_modules(os.path.dirname(os.path.dirname(__file__)))
        for _loc, name in modules.items():
            mod_locs, _ = importer.find_module(name, ['cloudinit.sources'], [])
            if mod_locs:
                importer.import_module(mod_locs[0])
        for child in DataSource.__subclasses__():
            if 'Test' in child.dsname:
                continue
            self.assertEqual(
                base_args,
                get_args(child.get_hostname),  # pylint: disable=W1505
                '%s does not implement DataSource.get_hostname params'
                % child)
            for grandchild in child.__subclasses__():
                self.assertEqual(
                    base_args,
                    get_args(grandchild.get_hostname),  # pylint: disable=W1505
                    '%s does not implement DataSource.get_hostname params'
                    % grandchild)

    def test_clear_cached_attrs_resets_cached_attr_class_attributes(self):
        """Class attributes listed in cached_attr_defaults are reset."""
        count = 0
        # Setup values for all cached class attributes
        for attr, value in self.datasource.cached_attr_defaults:
            setattr(self.datasource, attr, count)
            count += 1
        self.datasource._dirty_cache = True
        self.datasource.clear_cached_attrs()
        for attr, value in self.datasource.cached_attr_defaults:
            self.assertEqual(value, getattr(self.datasource, attr))

    def test_clear_cached_attrs_noops_on_clean_cache(self):
        """Class attributes listed in cached_attr_defaults are reset."""
        count = 0
        # Setup values for all cached class attributes
        for attr, _ in self.datasource.cached_attr_defaults:
            setattr(self.datasource, attr, count)
            count += 1
        self.datasource._dirty_cache = False   # Fake clean cache
        self.datasource.clear_cached_attrs()
        count = 0
        for attr, _ in self.datasource.cached_attr_defaults:
            self.assertEqual(count, getattr(self.datasource, attr))
            count += 1

    def test_clear_cached_attrs_skips_non_attr_class_attributes(self):
        """Skip any cached_attr_defaults which aren't class attributes."""
        self.datasource._dirty_cache = True
        self.datasource.clear_cached_attrs()
        for attr in ('ec2_metadata', 'network_json'):
            self.assertFalse(hasattr(self.datasource, attr))

    def test_clear_cached_attrs_of_custom_attrs(self):
        """Custom attr_values can be passed to clear_cached_attrs."""
        self.datasource._dirty_cache = True
        cached_attr_name = self.datasource.cached_attr_defaults[0][0]
        setattr(self.datasource, cached_attr_name, 'himom')
        self.datasource.myattr = 'orig'
        self.datasource.clear_cached_attrs(
            attr_defaults=(('myattr', 'updated'),))
        self.assertEqual('himom', getattr(self.datasource, cached_attr_name))
        self.assertEqual('updated', self.datasource.myattr)

    def test_update_metadata_only_acts_on_supported_update_events(self):
        """update_metadata won't get_data on unsupported update events."""
        self.datasource.update_events['network'].discard(EventType.BOOT)
        self.assertEqual(
            {'network': set([EventType.BOOT_NEW_INSTANCE])},
            self.datasource.update_events)

        def fake_get_data():
            raise Exception('get_data should not be called')

        self.datasource.get_data = fake_get_data
        self.assertFalse(
            self.datasource.update_metadata(
                source_event_types=[EventType.BOOT]))

    def test_update_metadata_returns_true_on_supported_update_event(self):
        """update_metadata returns get_data response on supported events."""

        def fake_get_data():
            return True

        self.datasource.get_data = fake_get_data
        self.datasource._network_config = 'something'
        self.datasource._dirty_cache = True
        self.assertTrue(
            self.datasource.update_metadata(
                source_event_types=[
                    EventType.BOOT, EventType.BOOT_NEW_INSTANCE]))
        self.assertEqual(UNSET, self.datasource._network_config)
        self.assertIn(
            "DEBUG: Update datasource metadata and network config due to"
            " events: New instance first boot",
            self.logs.getvalue())


class TestRedactSensitiveData(CiTestCase):

    def test_redact_sensitive_data_noop_when_no_sensitive_keys_present(self):
        """When sensitive_keys is absent or empty from metadata do nothing."""
        md = {'my': 'data'}
        self.assertEqual(
            md, redact_sensitive_keys(md, redact_value='redacted'))
        md['sensitive_keys'] = []
        self.assertEqual(
            md, redact_sensitive_keys(md, redact_value='redacted'))

    def test_redact_sensitive_data_redacts_exact_match_name(self):
        """Only exact matched sensitive_keys are redacted from metadata."""
        md = {'sensitive_keys': ['md/secure'],
              'md': {'secure': 's3kr1t', 'insecure': 'publik'}}
        secure_md = copy.deepcopy(md)
        secure_md['md']['secure'] = 'redacted'
        self.assertEqual(
            secure_md,
            redact_sensitive_keys(md, redact_value='redacted'))

    def test_redact_sensitive_data_does_redacts_with_default_string(self):
        """When redact_value is absent, REDACT_SENSITIVE_VALUE is used."""
        md = {'sensitive_keys': ['md/secure'],
              'md': {'secure': 's3kr1t', 'insecure': 'publik'}}
        secure_md = copy.deepcopy(md)
        secure_md['md']['secure'] = 'redacted for non-root user'
        self.assertEqual(
            secure_md,
            redact_sensitive_keys(md))


# vi: ts=4 expandtab