summaryrefslogtreecommitdiff
path: root/libpod/boltdb_state_internal.go
blob: b6a0759b17b2a34e30af0d76d37cf8d9631cbbd6 (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
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
package libpod

import (
	"bytes"
	"runtime"
	"strings"

	"github.com/boltdb/bolt"
	"github.com/containers/libpod/pkg/rootless"
	"github.com/containers/storage"
	"github.com/pkg/errors"
	"github.com/sirupsen/logrus"
)

const (
	idRegistryName    = "id-registry"
	nameRegistryName  = "name-registry"
	nsRegistryName    = "ns-registry"
	ctrName           = "ctr"
	allCtrsName       = "all-ctrs"
	podName           = "pod"
	allPodsName       = "allPods"
	volName           = "vol"
	allVolsName       = "allVolumes"
	runtimeConfigName = "runtime-config"

	configName         = "config"
	stateName          = "state"
	dependenciesName   = "dependencies"
	volCtrDependencies = "vol-dependencies"
	netNSName          = "netns"
	containersName     = "containers"
	podIDName          = "pod-id"
	namespaceName      = "namespace"

	staticDirName   = "static-dir"
	tmpDirName      = "tmp-dir"
	runRootName     = "run-root"
	graphRootName   = "graph-root"
	graphDriverName = "graph-driver-name"
	osName          = "os"
	volPathName     = "volume-path"
)

var (
	idRegistryBkt    = []byte(idRegistryName)
	nameRegistryBkt  = []byte(nameRegistryName)
	nsRegistryBkt    = []byte(nsRegistryName)
	ctrBkt           = []byte(ctrName)
	allCtrsBkt       = []byte(allCtrsName)
	podBkt           = []byte(podName)
	allPodsBkt       = []byte(allPodsName)
	volBkt           = []byte(volName)
	allVolsBkt       = []byte(allVolsName)
	runtimeConfigBkt = []byte(runtimeConfigName)

	configKey          = []byte(configName)
	stateKey           = []byte(stateName)
	dependenciesBkt    = []byte(dependenciesName)
	volDependenciesBkt = []byte(volCtrDependencies)
	netNSKey           = []byte(netNSName)
	containersBkt      = []byte(containersName)
	podIDKey           = []byte(podIDName)
	namespaceKey       = []byte(namespaceName)

	staticDirKey   = []byte(staticDirName)
	tmpDirKey      = []byte(tmpDirName)
	runRootKey     = []byte(runRootName)
	graphRootKey   = []byte(graphRootName)
	graphDriverKey = []byte(graphDriverName)
	osKey          = []byte(osName)
	volPathKey     = []byte(volPathName)
)

// Check if the configuration of the database is compatible with the
// configuration of the runtime opening it
// If there is no runtime configuration loaded, load our own
func checkRuntimeConfig(db *bolt.DB, rt *Runtime) error {
	err := db.Update(func(tx *bolt.Tx) error {
		configBkt, err := getRuntimeConfigBucket(tx)
		if err != nil {
			return err
		}

		if err := validateDBAgainstConfig(configBkt, "OS", runtime.GOOS, osKey, runtime.GOOS); err != nil {
			return err
		}

		if err := validateDBAgainstConfig(configBkt, "libpod root directory (staticdir)",
			rt.config.StaticDir, staticDirKey, ""); err != nil {
			return err
		}

		if err := validateDBAgainstConfig(configBkt, "libpod temporary files directory (tmpdir)",
			rt.config.TmpDir, tmpDirKey, ""); err != nil {
			return err
		}

		storeOpts, err := storage.DefaultStoreOptions(rootless.IsRootless(), rootless.GetRootlessUID())
		if err != nil {
			return err
		}
		if err := validateDBAgainstConfig(configBkt, "storage temporary directory (runroot)",
			rt.config.StorageConfig.RunRoot, runRootKey,
			storeOpts.RunRoot); err != nil {
			return err
		}

		if err := validateDBAgainstConfig(configBkt, "storage graph root directory (graphroot)",
			rt.config.StorageConfig.GraphRoot, graphRootKey,
			storeOpts.GraphRoot); err != nil {
			return err
		}

		if err := validateDBAgainstConfig(configBkt, "storage graph driver",
			rt.config.StorageConfig.GraphDriverName,
			graphDriverKey,
			storeOpts.GraphDriverName); err != nil {
			return err
		}

		return validateDBAgainstConfig(configBkt, "volume path",
			rt.config.VolumePath, volPathKey, "")
	})

	return err
}

// Validate a configuration entry in the DB against current runtime config
// If the given configuration key does not exist it will be created
// If the given runtimeValue or value retrieved from the database are the empty
// string and defaultValue is not, defaultValue will be checked instead. This
// ensures that we will not fail on configuration changes in configured c/storage.
func validateDBAgainstConfig(bucket *bolt.Bucket, fieldName, runtimeValue string, keyName []byte, defaultValue string) error {
	keyBytes := bucket.Get(keyName)
	if keyBytes == nil {
		dbValue := []byte(runtimeValue)
		if runtimeValue == "" && defaultValue != "" {
			dbValue = []byte(defaultValue)
		}

		if err := bucket.Put(keyName, dbValue); err != nil {
			return errors.Wrapf(err, "error updating %s in DB runtime config", fieldName)
		}
	} else {
		if runtimeValue != string(keyBytes) {
			// If runtimeValue is the empty string, check against
			// the default
			if runtimeValue == "" && defaultValue != "" &&
				string(keyBytes) == defaultValue {
				return nil
			}

			// If DB value is the empty string, check that the
			// runtime value is the default
			if string(keyBytes) == "" && defaultValue != "" &&
				runtimeValue == defaultValue {
				return nil
			}

			return errors.Wrapf(ErrDBBadConfig, "database %s %s does not match our %s %s",
				fieldName, string(keyBytes), fieldName, runtimeValue)
		}
	}

	return nil
}

// Open a connection to the database.
// Must be paired with a `defer closeDBCon()` on the returned database, to
// ensure the state is properly unlocked
func (s *BoltState) getDBCon() (*bolt.DB, error) {
	// We need an in-memory lock to avoid issues around POSIX file advisory
	// locks as described in the link below:
	// https://www.sqlite.org/src/artifact/c230a7a24?ln=994-1081
	s.dbLock.Lock()

	db, err := bolt.Open(s.dbPath, 0600, nil)
	if err != nil {
		return nil, errors.Wrapf(err, "error opening database %s", s.dbPath)
	}

	return db, nil
}

// Close a connection to the database.
// MUST be used in place of `db.Close()` to ensure proper unlocking of the
// state.
func (s *BoltState) closeDBCon(db *bolt.DB) error {
	err := db.Close()

	s.dbLock.Unlock()

	return err
}

func getIDBucket(tx *bolt.Tx) (*bolt.Bucket, error) {
	bkt := tx.Bucket(idRegistryBkt)
	if bkt == nil {
		return nil, errors.Wrapf(ErrDBBadConfig, "id registry bucket not found in DB")
	}
	return bkt, nil
}

func getNamesBucket(tx *bolt.Tx) (*bolt.Bucket, error) {
	bkt := tx.Bucket(nameRegistryBkt)
	if bkt == nil {
		return nil, errors.Wrapf(ErrDBBadConfig, "name registry bucket not found in DB")
	}
	return bkt, nil
}

func getNSBucket(tx *bolt.Tx) (*bolt.Bucket, error) {
	bkt := tx.Bucket(nsRegistryBkt)
	if bkt == nil {
		return nil, errors.Wrapf(ErrDBBadConfig, "namespace registry bucket not found in DB")
	}
	return bkt, nil
}

func getCtrBucket(tx *bolt.Tx) (*bolt.Bucket, error) {
	bkt := tx.Bucket(ctrBkt)
	if bkt == nil {
		return nil, errors.Wrapf(ErrDBBadConfig, "containers bucket not found in DB")
	}
	return bkt, nil
}

func getAllCtrsBucket(tx *bolt.Tx) (*bolt.Bucket, error) {
	bkt := tx.Bucket(allCtrsBkt)
	if bkt == nil {
		return nil, errors.Wrapf(ErrDBBadConfig, "all containers bucket not found in DB")
	}
	return bkt, nil
}

func getPodBucket(tx *bolt.Tx) (*bolt.Bucket, error) {
	bkt := tx.Bucket(podBkt)
	if bkt == nil {
		return nil, errors.Wrapf(ErrDBBadConfig, "pods bucket not found in DB")
	}
	return bkt, nil
}

func getAllPodsBucket(tx *bolt.Tx) (*bolt.Bucket, error) {
	bkt := tx.Bucket(allPodsBkt)
	if bkt == nil {
		return nil, errors.Wrapf(ErrDBBadConfig, "all pods bucket not found in DB")
	}
	return bkt, nil
}

func getVolBucket(tx *bolt.Tx) (*bolt.Bucket, error) {
	bkt := tx.Bucket(volBkt)
	if bkt == nil {
		return nil, errors.Wrapf(ErrDBBadConfig, "volumes bucket not found in DB")
	}
	return bkt, nil
}

func getAllVolsBucket(tx *bolt.Tx) (*bolt.Bucket, error) {
	bkt := tx.Bucket(allVolsBkt)
	if bkt == nil {
		return nil, errors.Wrapf(ErrDBBadConfig, "all volumes bucket not found in DB")
	}
	return bkt, nil
}

func getRuntimeConfigBucket(tx *bolt.Tx) (*bolt.Bucket, error) {
	bkt := tx.Bucket(runtimeConfigBkt)
	if bkt == nil {
		return nil, errors.Wrapf(ErrDBBadConfig, "runtime configuration bucket not found in DB")
	}
	return bkt, nil
}

func (s *BoltState) getContainerFromDB(id []byte, ctr *Container, ctrsBkt *bolt.Bucket) error {
	valid := true
	ctrBkt := ctrsBkt.Bucket(id)
	if ctrBkt == nil {
		return errors.Wrapf(ErrNoSuchCtr, "container %s not found in DB", string(id))
	}

	if s.namespaceBytes != nil {
		ctrNamespaceBytes := ctrBkt.Get(namespaceKey)
		if !bytes.Equal(s.namespaceBytes, ctrNamespaceBytes) {
			return errors.Wrapf(ErrNSMismatch, "cannot retrieve container %s as it is part of namespace %q and we are in namespace %q", string(id), string(ctrNamespaceBytes), s.namespace)
		}
	}

	configBytes := ctrBkt.Get(configKey)
	if configBytes == nil {
		return errors.Wrapf(ErrInternal, "container %s missing config key in DB", string(id))
	}

	if err := json.Unmarshal(configBytes, ctr.config); err != nil {
		return errors.Wrapf(err, "error unmarshalling container %s config", string(id))
	}

	// Get the lock
	lock, err := s.runtime.lockManager.RetrieveLock(ctr.config.LockID)
	if err != nil {
		return errors.Wrapf(err, "error retrieving lock for container %s", string(id))
	}
	ctr.lock = lock

	ctr.runtime = s.runtime
	ctr.valid = valid

	return nil
}

func (s *BoltState) getPodFromDB(id []byte, pod *Pod, podBkt *bolt.Bucket) error {
	podDB := podBkt.Bucket(id)
	if podDB == nil {
		return errors.Wrapf(ErrNoSuchPod, "pod with ID %s not found", string(id))
	}

	if s.namespaceBytes != nil {
		podNamespaceBytes := podDB.Get(namespaceKey)
		if !bytes.Equal(s.namespaceBytes, podNamespaceBytes) {
			return errors.Wrapf(ErrNSMismatch, "cannot retrieve pod %s as it is part of namespace %q and we are in namespace %q", string(id), string(podNamespaceBytes), s.namespace)
		}
	}

	podConfigBytes := podDB.Get(configKey)
	if podConfigBytes == nil {
		return errors.Wrapf(ErrInternal, "pod %s is missing configuration key in DB", string(id))
	}

	if err := json.Unmarshal(podConfigBytes, pod.config); err != nil {
		return errors.Wrapf(err, "error unmarshalling pod %s config from DB", string(id))
	}

	// Get the lock
	lock, err := s.runtime.lockManager.RetrieveLock(pod.config.LockID)
	if err != nil {
		return errors.Wrapf(err, "error retrieving lock for pod %s", string(id))
	}
	pod.lock = lock

	pod.runtime = s.runtime
	pod.valid = true

	return nil
}

func (s *BoltState) getVolumeFromDB(name []byte, volume *Volume, volBkt *bolt.Bucket) error {
	volDB := volBkt.Bucket(name)
	if volDB == nil {
		return errors.Wrapf(ErrNoSuchVolume, "volume with name %s not found", string(name))
	}

	volConfigBytes := volDB.Get(configKey)
	if volConfigBytes == nil {
		return errors.Wrapf(ErrInternal, "volume %s is missing configuration key in DB", string(name))
	}

	if err := json.Unmarshal(volConfigBytes, volume.config); err != nil {
		return errors.Wrapf(err, "error unmarshalling volume %s config from DB", string(name))
	}

	volume.runtime = s.runtime
	volume.valid = true

	return nil
}

// Add a container to the DB
// If pod is not nil, the container is added to the pod as well
func (s *BoltState) addContainer(ctr *Container, pod *Pod) error {
	if s.namespace != "" && s.namespace != ctr.config.Namespace {
		return errors.Wrapf(ErrNSMismatch, "cannot add container %s as it is in namespace %q and we are in namespace %q",
			ctr.ID(), s.namespace, ctr.config.Namespace)
	}

	// JSON container structs to insert into DB
	// TODO use a higher-performance struct encoding than JSON
	configJSON, err := json.Marshal(ctr.config)
	if err != nil {
		return errors.Wrapf(err, "error marshalling container %s config to JSON", ctr.ID())
	}
	stateJSON, err := json.Marshal(ctr.state)
	if err != nil {
		return errors.Wrapf(err, "error marshalling container %s state to JSON", ctr.ID())
	}
	netNSPath := getNetNSPath(ctr)
	dependsCtrs := ctr.Dependencies()

	ctrID := []byte(ctr.ID())
	ctrName := []byte(ctr.Name())

	var ctrNamespace []byte
	if ctr.config.Namespace != "" {
		ctrNamespace = []byte(ctr.config.Namespace)
	}

	db, err := s.getDBCon()
	if err != nil {
		return err
	}
	defer s.closeDBCon(db)

	err = db.Update(func(tx *bolt.Tx) error {
		idsBucket, err := getIDBucket(tx)
		if err != nil {
			return err
		}

		namesBucket, err := getNamesBucket(tx)
		if err != nil {
			return err
		}

		nsBucket, err := getNSBucket(tx)
		if err != nil {
			return err
		}

		ctrBucket, err := getCtrBucket(tx)
		if err != nil {
			return err
		}

		allCtrsBucket, err := getAllCtrsBucket(tx)
		if err != nil {
			return err
		}

		volBkt, err := getVolBucket(tx)
		if err != nil {
			return err
		}

		// If a pod was given, check if it exists
		var podDB *bolt.Bucket
		var podCtrs *bolt.Bucket
		if pod != nil {
			podBucket, err := getPodBucket(tx)
			if err != nil {
				return err
			}

			podID := []byte(pod.ID())

			podDB = podBucket.Bucket(podID)
			if podDB == nil {
				pod.valid = false
				return errors.Wrapf(ErrNoSuchPod, "pod %s does not exist in database", pod.ID())
			}
			podCtrs = podDB.Bucket(containersBkt)
			if podCtrs == nil {
				return errors.Wrapf(ErrInternal, "pod %s does not have a containers bucket", pod.ID())
			}

			podNS := podDB.Get(namespaceKey)
			if !bytes.Equal(podNS, ctrNamespace) {
				return errors.Wrapf(ErrNSMismatch, "container %s is in namespace %s and pod %s is in namespace %s",
					ctr.ID(), ctr.config.Namespace, pod.ID(), pod.config.Namespace)
			}
		}

		// Check if we already have a container with the given ID and name
		idExist := idsBucket.Get(ctrID)
		if idExist != nil {
			return errors.Wrapf(ErrCtrExists, "ID %s is in use", ctr.ID())
		}
		nameExist := namesBucket.Get(ctrName)
		if nameExist != nil {
			return errors.Wrapf(ErrCtrExists, "name %s is in use", ctr.Name())
		}

		// No overlapping containers
		// Add the new container to the DB
		if err := idsBucket.Put(ctrID, ctrName); err != nil {
			return errors.Wrapf(err, "error adding container %s ID to DB", ctr.ID())
		}
		if err := namesBucket.Put(ctrName, ctrID); err != nil {
			return errors.Wrapf(err, "error adding container %s name (%s) to DB", ctr.ID(), ctr.Name())
		}
		if ctrNamespace != nil {
			if err := nsBucket.Put(ctrID, ctrNamespace); err != nil {
				return errors.Wrapf(err, "error adding container %s namespace (%q) to DB", ctr.ID(), ctr.Namespace())
			}
		}
		if err := allCtrsBucket.Put(ctrID, ctrName); err != nil {
			return errors.Wrapf(err, "error adding container %s to all containers bucket in DB", ctr.ID())
		}

		newCtrBkt, err := ctrBucket.CreateBucket(ctrID)
		if err != nil {
			return errors.Wrapf(err, "error adding container %s bucket to DB", ctr.ID())
		}

		if err := newCtrBkt.Put(configKey, configJSON); err != nil {
			return errors.Wrapf(err, "error adding container %s config to DB", ctr.ID())
		}
		if err := newCtrBkt.Put(stateKey, stateJSON); err != nil {
			return errors.Wrapf(err, "error adding container %s state to DB", ctr.ID())
		}
		if ctrNamespace != nil {
			if err := newCtrBkt.Put(namespaceKey, ctrNamespace); err != nil {
				return errors.Wrapf(err, "error adding container %s namespace to DB", ctr.ID())
			}
		}
		if pod != nil {
			if err := newCtrBkt.Put(podIDKey, []byte(pod.ID())); err != nil {
				return errors.Wrapf(err, "error adding container %s pod to DB", ctr.ID())
			}
		}
		if netNSPath != "" {
			if err := newCtrBkt.Put(netNSKey, []byte(netNSPath)); err != nil {
				return errors.Wrapf(err, "error adding container %s netns path to DB", ctr.ID())
			}
		}
		if _, err := newCtrBkt.CreateBucket(dependenciesBkt); err != nil {
			return errors.Wrapf(err, "error creating dependencies bucket for container %s", ctr.ID())
		}

		// Add dependencies for the container
		for _, dependsCtr := range dependsCtrs {
			depCtrID := []byte(dependsCtr)

			depCtrBkt := ctrBucket.Bucket(depCtrID)
			if depCtrBkt == nil {
				return errors.Wrapf(ErrNoSuchCtr, "container %s depends on container %s, but it does not exist in the DB", ctr.ID(), dependsCtr)
			}

			depCtrPod := depCtrBkt.Get(podIDKey)
			if pod != nil {
				// If we're part of a pod, make sure the dependency is part of the same pod
				if depCtrPod == nil {
					return errors.Wrapf(ErrInvalidArg, "container %s depends on container %s which is not in pod %s", ctr.ID(), dependsCtr, pod.ID())
				}

				if string(depCtrPod) != pod.ID() {
					return errors.Wrapf(ErrInvalidArg, "container %s depends on container %s which is in a different pod (%s)", ctr.ID(), dependsCtr, string(depCtrPod))
				}
			} else {
				// If we're not part of a pod, we cannot depend on containers in a pod
				if depCtrPod != nil {
					return errors.Wrapf(ErrInvalidArg, "container %s depends on container %s which is in a pod - containers not in pods cannot depend on containers in pods", ctr.ID(), dependsCtr)
				}
			}

			depNamespace := depCtrBkt.Get(namespaceKey)
			if !bytes.Equal(ctrNamespace, depNamespace) {
				return errors.Wrapf(ErrNSMismatch, "container %s in namespace %q depends on container %s in namespace %q - namespaces must match", ctr.ID(), ctr.config.Namespace, dependsCtr, string(depNamespace))
			}

			depCtrDependsBkt := depCtrBkt.Bucket(dependenciesBkt)
			if depCtrDependsBkt == nil {
				return errors.Wrapf(ErrInternal, "container %s does not have a dependencies bucket", dependsCtr)
			}
			if err := depCtrDependsBkt.Put(ctrID, ctrName); err != nil {
				return errors.Wrapf(err, "error adding ctr %s as dependency of container %s", ctr.ID(), dependsCtr)
			}
		}

		// Add ctr to pod
		if pod != nil {
			if err := podCtrs.Put(ctrID, ctrName); err != nil {
				return errors.Wrapf(err, "error adding container %s to pod %s", ctr.ID(), pod.ID())
			}
		}

		// Add container to volume dependencies bucket if container is using a named volume
		if ctr.runtime.config.VolumePath == "" {
			return nil
		}
		for _, vol := range ctr.config.Spec.Mounts {
			if strings.Contains(vol.Source, ctr.runtime.config.VolumePath) {
				volName := strings.Split(vol.Source[len(ctr.runtime.config.VolumePath)+1:], "/")[0]
				volDB := volBkt.Bucket([]byte(volName))
				if volDB == nil {
					return errors.Wrapf(ErrNoSuchVolume, "no volume with name %s found in database", volName)
				}

				ctrDepsBkt := volDB.Bucket(volDependenciesBkt)
				if depExists := ctrDepsBkt.Get(ctrID); depExists == nil {
					if err := ctrDepsBkt.Put(ctrID, ctrID); err != nil {
						return errors.Wrapf(err, "error storing container dependencies %q for volume %s in ctrDependencies bucket in DB", ctr.ID(), volName)
					}
				}
			}
		}

		return nil
	})
	return err
}

// Remove a container from the DB
// If pod is not nil, the container is treated as belonging to a pod, and
// will be removed from the pod as well
func (s *BoltState) removeContainer(ctr *Container, pod *Pod, tx *bolt.Tx) error {
	ctrID := []byte(ctr.ID())
	ctrName := []byte(ctr.Name())

	idsBucket, err := getIDBucket(tx)
	if err != nil {
		return err
	}

	namesBucket, err := getNamesBucket(tx)
	if err != nil {
		return err
	}

	ctrBucket, err := getCtrBucket(tx)
	if err != nil {
		return err
	}

	nsBucket, err := getNSBucket(tx)
	if err != nil {
		return err
	}

	allCtrsBucket, err := getAllCtrsBucket(tx)
	if err != nil {
		return err
	}

	volBkt, err := getVolBucket(tx)
	if err != nil {
		return err
	}

	// Does the pod exist?
	var podDB *bolt.Bucket
	if pod != nil {
		podBucket, err := getPodBucket(tx)
		if err != nil {
			return err
		}

		podID := []byte(pod.ID())

		podDB = podBucket.Bucket(podID)
		if podDB == nil {
			pod.valid = false
			return errors.Wrapf(ErrNoSuchPod, "no pod with ID %s found in DB", pod.ID())
		}
	}

	// Does the container exist?
	ctrExists := ctrBucket.Bucket(ctrID)
	if ctrExists == nil {
		ctr.valid = false
		return errors.Wrapf(ErrNoSuchCtr, "no container with ID %s found in DB", ctr.ID())
	}

	// Compare namespace
	// We can't remove containers not in our namespace
	if s.namespace != "" {
		if s.namespace != ctr.config.Namespace {
			return errors.Wrapf(ErrNSMismatch, "container %s is in namespace %q, does not match our namespace %q", ctr.ID(), ctr.config.Namespace, s.namespace)
		}
		if pod != nil && s.namespace != pod.config.Namespace {
			return errors.Wrapf(ErrNSMismatch, "pod %s is in namespace %q, does not match out namespace %q", pod.ID(), pod.config.Namespace, s.namespace)
		}
	}

	if podDB != nil {
		// Check if the container is in the pod, remove it if it is
		podCtrs := podDB.Bucket(containersBkt)
		if podCtrs == nil {
			// Malformed pod
			logrus.Errorf("pod %s malformed in database, missing containers bucket!", pod.ID())
		} else {
			ctrInPod := podCtrs.Get(ctrID)
			if ctrInPod == nil {
				return errors.Wrapf(ErrNoSuchCtr, "container %s is not in pod %s", ctr.ID(), pod.ID())
			}
			if err := podCtrs.Delete(ctrID); err != nil {
				return errors.Wrapf(err, "error removing container %s from pod %s", ctr.ID(), pod.ID())
			}
		}
	}

	// Does the container have dependencies?
	ctrDepsBkt := ctrExists.Bucket(dependenciesBkt)
	if ctrDepsBkt == nil {
		return errors.Wrapf(ErrInternal, "container %s does not have a dependencies bucket", ctr.ID())
	}
	deps := []string{}
	err = ctrDepsBkt.ForEach(func(id, value []byte) error {
		deps = append(deps, string(id))

		return nil
	})
	if err != nil {
		return err
	}
	if len(deps) != 0 {
		return errors.Wrapf(ErrCtrExists, "container %s is a dependency of the following containers: %s", ctr.ID(), strings.Join(deps, ", "))
	}

	if err := ctrBucket.DeleteBucket(ctrID); err != nil {
		return errors.Wrapf(ErrInternal, "error deleting container %s from DB", ctr.ID())
	}

	if err := idsBucket.Delete(ctrID); err != nil {
		return errors.Wrapf(err, "error deleting container %s ID in DB", ctr.ID())
	}

	if err := namesBucket.Delete(ctrName); err != nil {
		return errors.Wrapf(err, "error deleting container %s name in DB", ctr.ID())
	}
	if err := nsBucket.Delete(ctrID); err != nil {
		return errors.Wrapf(err, "error deleting container %s namespace in DB", ctr.ID())
	}
	if err := allCtrsBucket.Delete(ctrID); err != nil {
		return errors.Wrapf(err, "error deleting container %s from all containers bucket in DB", ctr.ID())
	}

	depCtrs := ctr.Dependencies()

	// Remove us from other container's dependencies
	for _, depCtr := range depCtrs {
		depCtrID := []byte(depCtr)

		depCtrBkt := ctrBucket.Bucket(depCtrID)
		if depCtrBkt == nil {
			// The dependent container has been removed
			// This should not be possible, and means the
			// state is inconsistent, but don't error
			// The container with inconsistent state is the
			// one being removed
			continue
		}

		depCtrDependsBkt := depCtrBkt.Bucket(dependenciesBkt)
		if depCtrDependsBkt == nil {
			// This is more serious - another container in
			// the state is inconsistent
			// Log it, continue removing
			logrus.Errorf("Container %s is missing dependencies bucket in DB", ctr.ID())
			continue
		}

		if err := depCtrDependsBkt.Delete(ctrID); err != nil {
			return errors.Wrapf(err, "error removing container %s as a dependency of container %s", ctr.ID(), depCtr)
		}
	}

	// Remove container from volume dependencies bucket if container is using a named volume
	for _, vol := range ctr.config.Spec.Mounts {
		if strings.Contains(vol.Source, ctr.runtime.config.VolumePath) {
			volName := strings.Split(vol.Source[len(ctr.runtime.config.VolumePath)+1:], "/")[0]

			volDB := volBkt.Bucket([]byte(volName))
			if volDB == nil {
				// Let's assume the volume was already deleted and continue to remove the container
				continue
			}

			ctrDepsBkt := volDB.Bucket(volDependenciesBkt)
			if depExists := ctrDepsBkt.Get(ctrID); depExists != nil {
				if err := ctrDepsBkt.Delete(ctrID); err != nil {
					return errors.Wrapf(err, "error deleting container dependencies %q for volume %s in ctrDependencies bucket in DB", ctr.ID(), volName)
				}
			}
		}
	}

	return nil
}