summaryrefslogtreecommitdiff
path: root/libpod/container.go
blob: 2b70afec22186a3d103f8792bb95b77c3d1dd4a0 (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
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
1001
1002
1003
1004
1005
1006
1007
1008
1009
1010
1011
1012
1013
1014
1015
1016
1017
1018
1019
1020
1021
1022
1023
1024
1025
1026
1027
1028
1029
1030
1031
1032
1033
1034
1035
1036
1037
1038
1039
1040
1041
1042
1043
1044
1045
1046
1047
1048
1049
1050
1051
1052
1053
1054
1055
1056
1057
1058
1059
1060
1061
1062
1063
1064
1065
1066
1067
1068
1069
1070
1071
1072
1073
1074
1075
1076
1077
1078
1079
1080
1081
1082
1083
1084
1085
1086
1087
1088
1089
1090
1091
1092
1093
1094
1095
1096
1097
1098
1099
1100
1101
1102
1103
1104
1105
1106
1107
1108
1109
1110
1111
1112
1113
1114
1115
1116
1117
1118
1119
1120
1121
1122
1123
1124
1125
1126
1127
1128
1129
1130
1131
1132
1133
1134
1135
1136
1137
1138
1139
1140
1141
1142
1143
1144
1145
1146
1147
1148
1149
1150
1151
1152
1153
1154
1155
1156
1157
1158
1159
1160
1161
1162
1163
1164
1165
1166
1167
1168
1169
1170
1171
1172
1173
1174
1175
1176
1177
1178
package libpod

import (
	"encoding/json"
	"fmt"
	"io"
	"io/ioutil"
	"os"
	"path/filepath"
	"strconv"
	"syscall"
	"time"

	"github.com/containerd/cgroups"
	"github.com/containernetworking/plugins/pkg/ns"
	"github.com/containers/storage"
	"github.com/containers/storage/pkg/archive"
	"github.com/cri-o/ocicni/pkg/ocicni"
	"github.com/docker/docker/daemon/caps"
	"github.com/docker/docker/pkg/mount"
	"github.com/docker/docker/pkg/namesgenerator"
	"github.com/docker/docker/pkg/stringid"
	"github.com/docker/docker/pkg/term"
	"github.com/mrunalp/fileutils"
	spec "github.com/opencontainers/runtime-spec/specs-go"
	"github.com/opencontainers/runtime-tools/generate"
	"github.com/opencontainers/selinux/go-selinux/label"
	"github.com/pkg/errors"
	"github.com/projectatomic/libpod/libpod/driver"
	crioAnnotations "github.com/projectatomic/libpod/pkg/annotations"
	"github.com/projectatomic/libpod/pkg/chrootuser"
	"github.com/sirupsen/logrus"
	"github.com/ulule/deepcopier"
	"golang.org/x/sys/unix"
	"k8s.io/apimachinery/pkg/util/wait"
	"k8s.io/client-go/tools/remotecommand"
)

// ContainerState represents the current state of a container
type ContainerState int

const (
	// ContainerStateUnknown indicates that the container is in an error
	// state where information about it cannot be retrieved
	ContainerStateUnknown ContainerState = iota
	// ContainerStateConfigured indicates that the container has had its
	// storage configured but it has not been created in the OCI runtime
	ContainerStateConfigured ContainerState = iota
	// ContainerStateCreated indicates the container has been created in
	// the OCI runtime but not started
	ContainerStateCreated ContainerState = iota
	// ContainerStateRunning indicates the container is currently executing
	ContainerStateRunning ContainerState = iota
	// ContainerStateStopped indicates that the container was running but has
	// exited
	ContainerStateStopped ContainerState = iota
	// ContainerStatePaused indicates that the container has been paused
	ContainerStatePaused ContainerState = iota
	// name of the directory holding the artifacts
	artifactsDir = "artifacts"
)

// CGroupParent is the prefix to a cgroup path in libpod
var CGroupParent = "/libpod_parent"

// Container is a single OCI container
type Container struct {
	config *ContainerConfig

	pod         *Pod
	runningSpec *spec.Spec

	state *containerRuntimeInfo

	valid   bool
	lock    storage.Locker
	runtime *Runtime
}

// containerRuntimeInfo contains the current state of the container
// It is stored on disk in a tmpfs and recreated on reboot
type containerRuntimeInfo struct {
	// The current state of the running container
	State ContainerState `json:"state"`
	// The path to the JSON OCI runtime spec for this container
	ConfigPath string `json:"configPath,omitempty"`
	// RunDir is a per-boot directory for container content
	RunDir string `json:"runDir,omitempty"`
	// Mounted indicates whether the container's storage has been mounted
	// for use
	Mounted bool `json:"mounted,omitempty"`
	// MountPoint contains the path to the container's mounted storage
	Mountpoint string `json:"mountPoint,omitempty"`
	// StartedTime is the time the container was started
	StartedTime time.Time `json:"startedTime,omitempty"`
	// FinishedTime is the time the container finished executing
	FinishedTime time.Time `json:"finishedTime,omitempty"`
	// ExitCode is the exit code returned when the container stopped
	ExitCode int32 `json:"exitCode,omitempty"`
	// OOMKilled indicates that the container was killed as it ran out of
	// memory
	OOMKilled bool `json:"oomKilled,omitempty"`
	// PID is the PID of a running container
	PID int `json:"pid,omitempty"`
	// NetNSPath is the path of the container's network namespace
	// Will only be set if config.CreateNetNS is true, or the container was
	// told to join another container's network namespace
	NetNS ns.NetNS
	// TODO: Save information about image used in container if one is used
}

// ContainerConfig contains all information that was used to create the
// container. It may not be changed once created.
// It is stored, read-only, on disk
type ContainerConfig struct {
	Spec *spec.Spec `json:"spec"`
	ID   string     `json:"id"`
	Name string     `json:"name"`
	// Information on the image used for the root filesystem
	RootfsImageID   string `json:"rootfsImageID,omitempty"`
	RootfsImageName string `json:"rootfsImageName,omitempty"`
	UseImageConfig  bool   `json:"useImageConfig"`
	// SELinux process label for container
	ProcessLabel string `json:"ProcessLabel,omitempty"`
	// SELinux mount label for root filesystem
	MountLabel string `json:"MountLabel,omitempty"`
	// Src path to be mounted on /dev/shm in container
	ShmDir string `json:"ShmDir,omitempty"`
	// CreateNetNS indicates that libpod should create and configure a new
	// network namespace for the container
	CreateNetNS bool `json:"createNetNS"`
	// PortMappings are the ports forwarded to the container's network
	// namespace
	// These are not used unless CreateNetNS is true
	PortMappings []ocicni.PortMapping
	// Static directory for container content that will persist across
	// reboot
	StaticDir string `json:"staticDir"`
	// Whether to keep container STDIN open
	Stdin bool `json:"stdin,omitempty"`
	// Pod the container belongs to
	Pod string `json:"pod,omitempty"`
	// Labels is a set of key-value pairs providing additional information
	// about a container
	Labels map[string]string `json:"labels,omitempty"`
	// Mounts list contains all additional mounts by the container runtime.
	Mounts []string `json:"mounts,omitempty"`
	// StopSignal is the signal that will be used to stop the container
	StopSignal uint `json:"stopSignal,omitempty"`
	// StopTimeout is the signal that will be used to stop the container
	StopTimeout uint `json:"stopTimeout,omitempty"`
	// Shared namespaces with container
	SharedNamespaceCtr *string           `json:"shareNamespacesWith,omitempty"`
	SharedNamespaceMap map[string]string `json:"sharedNamespaces"`
	// Time container was created
	CreatedTime time.Time `json:"createdTime"`
	// User/GID to use within the container
	User string `json:"user"`
	// TODO save log location here and pass into OCI code
	// TODO allow overriding of log path
}

// ContainerStater returns a string representation for users
// of a container state
func (t ContainerState) String() string {
	switch t {
	case ContainerStateUnknown:
		return "unknown"
	case ContainerStateConfigured:
		return "configured"
	case ContainerStateCreated:
		return "created"
	case ContainerStateRunning:
		return "running"
	case ContainerStateStopped:
		return "exited"
	case ContainerStatePaused:
		return "paused"
	}
	return "bad state"
}

// ID returns the container's ID
func (c *Container) ID() string {
	return c.config.ID
}

// Name returns the container's name
func (c *Container) Name() string {
	return c.config.Name
}

// ShmDir returns the sources path to be mounted on /dev/shm in container
func (c *Container) ShmDir() string {
	return c.config.ShmDir
}

// ProcessLabel returns the selinux ProcessLabel of the container
func (c *Container) ProcessLabel() string {
	return c.config.ProcessLabel
}

// Spec returns the container's OCI runtime spec
// The spec returned is the one used to create the container. The running
// spec may differ slightly as mounts are added based on the image
func (c *Container) Spec() *spec.Spec {
	returnSpec := new(spec.Spec)
	deepcopier.Copy(c.config.Spec).To(returnSpec)

	return returnSpec
}

// Labels returns the container's labels
func (c *Container) Labels() map[string]string {
	labels := make(map[string]string)
	for key, value := range c.config.Labels {
		labels[key] = value
	}
	return labels
}

// Config returns the configuration used to create the container
func (c *Container) Config() *ContainerConfig {
	returnConfig := new(ContainerConfig)
	deepcopier.Copy(c.config).To(returnConfig)

	return returnConfig
}

// RuntimeName returns the name of the runtime
func (c *Container) RuntimeName() string {
	return c.runtime.ociRuntime.name
}

// rootFsSize gets the size of the container's root filesystem
// A container FS is split into two parts.  The first is the top layer, a
// mutable layer, and the rest is the RootFS: the set of immutable layers
// that make up the image on which the container is based.
func (c *Container) rootFsSize() (int64, error) {
	container, err := c.runtime.store.Container(c.ID())
	if err != nil {
		return 0, err
	}

	// Ignore the size of the top layer.   The top layer is a mutable RW layer
	// and is not considered a part of the rootfs
	rwLayer, err := c.runtime.store.Layer(container.LayerID)
	if err != nil {
		return 0, err
	}
	layer, err := c.runtime.store.Layer(rwLayer.Parent)
	if err != nil {
		return 0, err
	}

	size := int64(0)
	for layer.Parent != "" {
		layerSize, err := c.runtime.store.DiffSize(layer.Parent, layer.ID)
		if err != nil {
			return size, errors.Wrapf(err, "getting diffsize of layer %q and its parent %q", layer.ID, layer.Parent)
		}
		size += layerSize
		layer, err = c.runtime.store.Layer(layer.Parent)
		if err != nil {
			return 0, err
		}
	}
	// Get the size of the last layer.  Has to be outside of the loop
	// because the parent of the last layer is "", andlstore.Get("")
	// will return an error.
	layerSize, err := c.runtime.store.DiffSize(layer.Parent, layer.ID)
	return size + layerSize, err
}

// rwSize Gets the size of the mutable top layer of the container.
func (c *Container) rwSize() (int64, error) {
	container, err := c.runtime.store.Container(c.ID())
	if err != nil {
		return 0, err
	}

	// Get the size of the top layer by calculating the size of the diff
	// between the layer and its parent.  The top layer of a container is
	// the only RW layer, all others are immutable
	layer, err := c.runtime.store.Layer(container.LayerID)
	if err != nil {
		return 0, err
	}
	return c.runtime.store.DiffSize(layer.Parent, layer.ID)
}

// LogPath returns the path to the container's log file
// This file will only be present after Init() is called to create the container
// in runc
func (c *Container) LogPath() string {
	// TODO store this in state and allow overriding
	return c.logPath()
}

// ExitCode returns the exit code of the container as
// an int32
func (c *Container) ExitCode() (int32, error) {
	c.lock.Lock()
	defer c.lock.Unlock()
	if err := c.syncContainer(); err != nil {
		return 0, errors.Wrapf(err, "error updating container %s state", c.ID())
	}
	return c.state.ExitCode, nil
}

// Mounted returns a bool as to if the container's storage
// is mounted
func (c *Container) Mounted() (bool, error) {
	c.lock.Lock()
	defer c.lock.Unlock()
	if err := c.syncContainer(); err != nil {
		return false, errors.Wrapf(err, "error updating container %s state", c.ID())
	}
	return c.state.Mounted, nil
}

// Mountpoint returns the path to the container's mounted
// storage as a string
func (c *Container) Mountpoint() (string, error) {
	c.lock.Lock()
	defer c.lock.Unlock()
	if err := c.syncContainer(); err != nil {
		return "", errors.Wrapf(err, "error updating container %s state", c.ID())
	}
	return c.state.Mountpoint, nil
}

// StartedTime is the time the container was started
func (c *Container) StartedTime() (time.Time, error) {
	c.lock.Lock()
	defer c.lock.Unlock()
	if err := c.syncContainer(); err != nil {
		return time.Time{}, errors.Wrapf(err, "error updating container %s state", c.ID())
	}
	return c.state.StartedTime, nil
}

// FinishedTime is the time the container was stopped
func (c *Container) FinishedTime() (time.Time, error) {
	c.lock.Lock()
	defer c.lock.Unlock()
	if err := c.syncContainer(); err != nil {
		return time.Time{}, errors.Wrapf(err, "error updating container %s state", c.ID())
	}
	return c.state.FinishedTime, nil
}

// State returns the current state of the container
func (c *Container) State() (ContainerState, error) {
	c.lock.Lock()
	defer c.lock.Unlock()

	if err := c.syncContainer(); err != nil {
		return ContainerStateUnknown, err
	}
	return c.state.State, nil
}

// PID returns the PID of the container
// An error is returned if the container is not running
func (c *Container) PID() (int, error) {
	c.lock.Lock()
	defer c.lock.Unlock()

	if err := c.syncContainer(); err != nil {
		return -1, err
	}

	return c.state.PID, nil
}

// MountPoint returns the mount point of the continer
func (c *Container) MountPoint() (string, error) {
	c.lock.Lock()
	defer c.lock.Unlock()
	if err := c.syncContainer(); err != nil {
		return "", errors.Wrapf(err, "error updating container %s state", c.ID())
	}
	return c.state.Mountpoint, nil
}

// The path to the container's root filesystem - where the OCI spec will be
// placed, amongst other things
func (c *Container) bundlePath() string {
	return c.config.StaticDir
}

// The path to the container's logs file
func (c *Container) logPath() string {
	return filepath.Join(c.config.StaticDir, "ctr.log")
}

// Retrieves the path of the container's attach socket
func (c *Container) attachSocketPath() string {
	return filepath.Join(c.runtime.ociRuntime.socketsDir, c.ID(), "attach")
}

// Sync this container with on-disk state and runc status
// Should only be called with container lock held
// This function should suffice to ensure a container's state is accurate and
// it is valid for use.
func (c *Container) syncContainer() error {
	if err := c.runtime.state.UpdateContainer(c); err != nil {
		return err
	}
	// If runc knows about the container, update its status in runc
	// And then save back to disk
	if (c.state.State != ContainerStateUnknown) &&
		(c.state.State != ContainerStateConfigured) {
		oldState := c.state.State
		// TODO: optionally replace this with a stat for the exit file
		if err := c.runtime.ociRuntime.updateContainerStatus(c); err != nil {
			return err
		}
		// Only save back to DB if state changed
		if c.state.State != oldState {
			if err := c.save(); err != nil {
				return err
			}
		}
	}

	if !c.valid {
		return errors.Wrapf(ErrCtrRemoved, "container %s is not valid", c.ID())
	}

	return nil
}

// Make a new container
func newContainer(rspec *spec.Spec, lockDir string) (*Container, error) {
	if rspec == nil {
		return nil, errors.Wrapf(ErrInvalidArg, "must provide a valid runtime spec to create container")
	}

	ctr := new(Container)
	ctr.config = new(ContainerConfig)
	ctr.state = new(containerRuntimeInfo)

	ctr.config.ID = stringid.GenerateNonCryptoID()
	ctr.config.Name = namesgenerator.GetRandomName(0)

	ctr.config.Spec = new(spec.Spec)
	deepcopier.Copy(rspec).To(ctr.config.Spec)
	ctr.config.CreatedTime = time.Now()

	// Path our lock file will reside at
	lockPath := filepath.Join(lockDir, ctr.config.ID)
	// Grab a lockfile at the given path
	lock, err := storage.GetLockfile(lockPath)
	if err != nil {
		return nil, errors.Wrapf(err, "error creating lockfile for new container")
	}
	ctr.lock = lock

	return ctr, nil
}

// Create container root filesystem for use
func (c *Container) setupStorage() error {
	if !c.valid {
		return errors.Wrapf(ErrCtrRemoved, "container %s is not valid", c.ID())
	}

	if c.state.State != ContainerStateConfigured {
		return errors.Wrapf(ErrCtrStateInvalid, "container %s must be in Configured state to have storage set up", c.ID())
	}

	// Need both an image ID and image name, plus a bool telling us whether to use the image configuration
	if c.config.RootfsImageID == "" || c.config.RootfsImageName == "" {
		return errors.Wrapf(ErrInvalidArg, "must provide image ID and image name to use an image")
	}

	containerInfo, err := c.runtime.storageService.CreateContainerStorage(c.runtime.imageContext, c.config.RootfsImageName, c.config.RootfsImageID, c.config.Name, c.config.ID, c.config.MountLabel)
	if err != nil {
		return errors.Wrapf(err, "error creating container storage")
	}

	c.config.StaticDir = containerInfo.Dir
	c.state.RunDir = containerInfo.RunDir

	artifacts := filepath.Join(c.config.StaticDir, artifactsDir)
	if err := os.MkdirAll(artifacts, 0755); err != nil {
		return errors.Wrapf(err, "error creating artifacts directory %q", artifacts)
	}

	return nil
}

// Tear down a container's storage prior to removal
func (c *Container) teardownStorage() error {
	if !c.valid {
		return errors.Wrapf(ErrCtrRemoved, "container %s is not valid", c.ID())
	}

	if c.state.State == ContainerStateRunning || c.state.State == ContainerStatePaused {
		return errors.Wrapf(ErrCtrStateInvalid, "cannot remove storage for container %s as it is running or paused", c.ID())
	}

	artifacts := filepath.Join(c.config.StaticDir, artifactsDir)
	if err := os.RemoveAll(artifacts); err != nil {
		return errors.Wrapf(err, "error removing artifacts %q", artifacts)
	}

	if err := c.cleanupStorage(); err != nil {
		return errors.Wrapf(err, "failed to cleanup container %s storage", c.ID())
	}

	if err := c.runtime.storageService.DeleteContainer(c.ID()); err != nil {
		return errors.Wrapf(err, "error removing container %s root filesystem", c.ID())
	}

	return nil
}

// Refresh refreshes the container's state after a restart
func (c *Container) refresh() error {
	c.lock.Lock()
	defer c.lock.Unlock()

	if !c.valid {
		return errors.Wrapf(ErrCtrRemoved, "container %s is not valid - may have been removed", c.ID())
	}

	// We need to get the container's temporary directory from c/storage
	// It was lost in the reboot and must be recreated
	dir, err := c.runtime.storageService.GetRunDir(c.ID())
	if err != nil {
		return errors.Wrapf(err, "error retrieving temporary directory for container %s", c.ID())
	}
	c.state.RunDir = dir

	if err := c.runtime.state.SaveContainer(c); err != nil {
		return errors.Wrapf(err, "error refreshing state for container %s", c.ID())
	}

	return nil
}

// Init creates a container in the OCI runtime
func (c *Container) Init() (err error) {
	c.lock.Lock()
	defer c.lock.Unlock()

	if err := c.syncContainer(); err != nil {
		return err
	}

	if c.state.State != ContainerStateConfigured {
		return errors.Wrapf(ErrCtrExists, "container %s has already been created in runtime", c.ID())
	}

	if err := c.mountStorage(); err != nil {
		return err
	}

	// Make a network namespace for the container
	if c.config.CreateNetNS && c.state.NetNS == nil {
		if err := c.runtime.createNetNS(c); err != nil {
			return err
		}
	}
	defer func() {
		if err != nil {
			if err2 := c.runtime.teardownNetNS(c); err2 != nil {
				logrus.Errorf("Error tearing down network namespace for container %s: %v", c.ID(), err2)
			}
		}
	}()

	// If the OCI spec already exists, we need to replace it
	// Cannot guarantee some things, e.g. network namespaces, have the same
	// paths
	jsonPath := filepath.Join(c.bundlePath(), "config.json")
	if _, err := os.Stat(jsonPath); err != nil {
		if !os.IsNotExist(err) {
			return errors.Wrapf(err, "error doing stat on container %s spec", c.ID())
		}
		// The spec does not exist, we're fine
	} else {
		// The spec exists, need to remove it
		if err := os.Remove(jsonPath); err != nil {
			return errors.Wrapf(err, "error replacing runtime spec for container %s", c.ID())
		}
	}

	// Copy /etc/resolv.conf to the container's rundir
	resolvPath := "/etc/resolv.conf"

	// Check if the host system is using system resolve and if so
	// copy its resolv.conf
	_, err = os.Stat("/run/systemd/resolve/resolv.conf")
	if err == nil {
		resolvPath = "/run/systemd/resolve/resolv.conf"
	}
	runDirResolv, err := c.copyHostFileToRundir(resolvPath)
	if err != nil {
		return errors.Wrapf(err, "unable to copy resolv.conf to ", runDirResolv)
	}
	// Copy /etc/hosts to the container's rundir
	runDirHosts, err := c.copyHostFileToRundir("/etc/hosts")
	if err != nil {
		return errors.Wrapf(err, "unable to copy /etc/hosts to ", runDirHosts)
	}

	// Save OCI spec to disk
	g := generate.NewFromSpec(c.config.Spec)
	// If network namespace was requested, add it now
	if c.config.CreateNetNS {
		g.AddOrReplaceLinuxNamespace(spec.NetworkNamespace, c.state.NetNS.Path())
	}
	// Mount ShmDir from host into container
	g.AddBindMount(c.config.ShmDir, "/dev/shm", []string{"rw"})
	// Bind mount resolv.conf
	g.AddBindMount(runDirResolv, "/etc/resolv.conf", []string{"rw"})
	// Bind mount hosts
	g.AddBindMount(runDirHosts, "/etc/hosts", []string{"rw"})

	if c.config.User != "" {
		if !c.state.Mounted {
			return errors.Wrapf(ErrCtrStateInvalid, "container %s must be mounted in order to translate User field", c.ID())
		}
		uid, gid, err := chrootuser.GetUser(c.state.Mountpoint, c.config.User)
		if err != nil {
			return err
		}
		// User and Group must go together
		g.SetProcessUID(uid)
		g.SetProcessGID(gid)
	}

	c.runningSpec = g.Spec()
	c.runningSpec.Root.Path = c.state.Mountpoint
	c.runningSpec.Annotations[crioAnnotations.Created] = c.config.CreatedTime.Format(time.RFC3339Nano)
	c.runningSpec.Annotations["org.opencontainers.image.stopSignal"] = fmt.Sprintf("%d", c.config.StopSignal)

	fileJSON, err := json.Marshal(c.runningSpec)
	if err != nil {
		return errors.Wrapf(err, "error exporting runtime spec for container %s to JSON", c.ID())
	}
	if err := ioutil.WriteFile(jsonPath, fileJSON, 0644); err != nil {
		return errors.Wrapf(err, "error writing runtime spec JSON to file for container %s", c.ID())
	}

	logrus.Debugf("Created OCI spec for container %s at %s", c.ID(), jsonPath)

	c.state.ConfigPath = jsonPath

	// With the spec complete, do an OCI create
	// TODO set cgroup parent in a sane fashion
	if err := c.runtime.ociRuntime.createContainer(c, CGroupParent); err != nil {
		return err
	}

	logrus.Debugf("Created container %s in runc", c.ID())

	c.state.State = ContainerStateCreated

	return c.save()
}

// Start starts a container
func (c *Container) Start() error {
	c.lock.Lock()
	defer c.lock.Unlock()

	if err := c.syncContainer(); err != nil {
		return err
	}

	// Container must be created or stopped to be started
	if !(c.state.State == ContainerStateCreated || c.state.State == ContainerStateStopped) {
		return errors.Wrapf(ErrCtrStateInvalid, "container %s must be in Created or Stopped state to be started", c.ID())
	}

	// Mount storage for the container
	if err := c.mountStorage(); err != nil {
		return err
	}

	if err := c.runtime.ociRuntime.startContainer(c); err != nil {
		return err
	}

	logrus.Debugf("Started container %s", c.ID())

	// Update container's state as it should be ContainerStateRunning now
	if err := c.runtime.ociRuntime.updateContainerStatus(c); err != nil {
		return err
	}

	return c.save()
}

// Stop uses the container's stop signal (or SIGTERM if no signal was specified)
// to stop the container, and if it has not stopped after the given timeout (in
// seconds), uses SIGKILL to attempt to forcibly stop the container.
// If timeout is 0, SIGKILL will be used immediately
func (c *Container) Stop(timeout uint) error {
	c.lock.Lock()
	defer c.lock.Unlock()
	logrus.Debugf("Stopping ctr %s with timeout %d", c.ID(), timeout)

	if err := c.syncContainer(); err != nil {
		return err
	}

	if c.state.State == ContainerStateConfigured ||
		c.state.State == ContainerStateUnknown ||
		c.state.State == ContainerStatePaused {
		return errors.Wrapf(ErrCtrStateInvalid, "can only stop created, running, or stopped containers")
	}

	if err := c.runtime.ociRuntime.stopContainer(c, timeout); err != nil {
		return err
	}

	// Sync the container's state to pick up return code
	if err := c.runtime.ociRuntime.updateContainerStatus(c); err != nil {
		return err
	}

	return c.cleanupStorage()
}

// Kill sends a signal to a container
func (c *Container) Kill(signal uint) error {
	c.lock.Lock()
	defer c.lock.Unlock()

	if err := c.syncContainer(); err != nil {
		return err
	}

	if c.state.State != ContainerStateRunning {
		return errors.Wrapf(ErrCtrStateInvalid, "can only kill running containers")
	}

	return c.runtime.ociRuntime.killContainer(c, signal)
}

// Exec starts a new process inside the container
func (c *Container) Exec(tty, privileged bool, env, cmd []string, user string) error {
	var capList []string
	c.lock.Lock()
	defer c.lock.Unlock()

	if err := c.syncContainer(); err != nil {
		return err
	}

	conState := c.state.State

	if conState != ContainerStateRunning {
		return errors.Errorf("cannot attach to container that is not running")
	}
	if privileged {
		capList = caps.GetAllCapabilities()
	}
	globalOpts := runcGlobalOptions{
		log: c.LogPath(),
	}
	execOpts := runcExecOptions{
		capAdd:  capList,
		pidFile: filepath.Join(c.state.RunDir, fmt.Sprintf("%s-execpid", stringid.GenerateNonCryptoID()[:12])),
		env:     env,
		user:    user,
		cwd:     c.config.Spec.Process.Cwd,
		tty:     tty,
	}

	return c.runtime.ociRuntime.execContainer(c, cmd, globalOpts, execOpts)
}

// Attach attaches to a container
// Returns fully qualified URL of streaming server for the container
func (c *Container) Attach(noStdin bool, keys string, attached chan<- bool) error {
	if err := c.syncContainer(); err != nil {
		return err
	}

	if c.state.State != ContainerStateCreated &&
		c.state.State != ContainerStateRunning {
		return errors.Wrapf(ErrCtrStateInvalid, "can only attach to created or running containers")
	}

	// Check the validity of the provided keys first
	var err error
	detachKeys := []byte{}
	if len(keys) > 0 {
		detachKeys, err = term.ToBytes(keys)
		if err != nil {
			return errors.Wrapf(err, "invalid detach keys")
		}
	}

	resize := make(chan remotecommand.TerminalSize)
	defer close(resize)

	err = c.attachContainerSocket(resize, noStdin, detachKeys, attached)
	return err
}

// Mount mounts a container's filesystem on the host
// The path where the container has been mounted is returned
func (c *Container) Mount(label string) (string, error) {
	c.lock.Lock()
	defer c.lock.Unlock()

	if err := c.syncContainer(); err != nil {
		return "", err
	}

	// return mountpoint if container already mounted
	if c.state.Mounted {
		return c.state.Mountpoint, nil
	}

	mountLabel := label
	if label == "" {
		mountLabel = c.config.MountLabel
	}
	mountPoint, err := c.runtime.store.Mount(c.ID(), mountLabel)
	if err != nil {
		return "", err
	}
	c.state.Mountpoint = mountPoint
	c.state.Mounted = true
	c.config.MountLabel = mountLabel

	if err := c.save(); err != nil {
		return "", err
	}

	return mountPoint, nil
}

// Unmount unmounts a container's filesystem on the host
func (c *Container) Unmount() error {
	c.lock.Lock()
	defer c.lock.Unlock()

	if err := c.syncContainer(); err != nil {
		return err
	}

	if c.state.State == ContainerStateRunning || c.state.State == ContainerStatePaused {
		return errors.Wrapf(ErrCtrStateInvalid, "cannot remove storage for container %s as it is running or paused", c.ID())
	}

	return c.cleanupStorage()
}

// Pause pauses a container
func (c *Container) Pause() error {
	c.lock.Lock()
	defer c.lock.Unlock()

	if err := c.syncContainer(); err != nil {
		return err
	}

	if c.state.State == ContainerStatePaused {
		return errors.Wrapf(ErrCtrStateInvalid, "%q is already paused", c.ID())
	}
	if c.state.State != ContainerStateRunning && c.state.State != ContainerStateCreated {
		return errors.Wrapf(ErrCtrStateInvalid, "%q is not running/created, can't pause", c.state.State)
	}
	if err := c.runtime.ociRuntime.pauseContainer(c); err != nil {
		return err
	}

	logrus.Debugf("Paused container %s", c.ID())

	// Update container's state as it should be ContainerStatePaused now
	if err := c.runtime.ociRuntime.updateContainerStatus(c); err != nil {
		return err
	}

	return c.save()
}

// Unpause unpauses a container
func (c *Container) Unpause() error {
	c.lock.Lock()
	defer c.lock.Unlock()

	if err := c.syncContainer(); err != nil {
		return err
	}

	if c.state.State != ContainerStatePaused {
		return errors.Wrapf(ErrCtrStateInvalid, "%q is not paused, can't unpause", c.ID())
	}
	if err := c.runtime.ociRuntime.unpauseContainer(c); err != nil {
		return err
	}

	logrus.Debugf("Unpaused container %s", c.ID())

	// Update container's state as it should be ContainerStateRunning now
	if err := c.runtime.ociRuntime.updateContainerStatus(c); err != nil {
		return err
	}

	return c.save()
}

// Export exports a container's root filesystem as a tar archive
// The archive will be saved as a file at the given path
func (c *Container) Export(path string) error {
	c.lock.Lock()
	defer c.lock.Unlock()

	if err := c.syncContainer(); err != nil {
		return err
	}

	return c.export(path)
}

func (c *Container) export(path string) error {
	mountPoint := c.state.Mountpoint
	if !c.state.Mounted {
		mount, err := c.runtime.store.Mount(c.ID(), c.config.MountLabel)
		if err != nil {
			return errors.Wrapf(err, "error mounting container %q", c.ID())
		}
		mountPoint = mount
		defer func() {
			if err := c.runtime.store.Unmount(c.ID()); err != nil {
				logrus.Errorf("error unmounting container %q: %v", c.ID(), err)
			}
		}()
	}

	input, err := archive.Tar(mountPoint, archive.Uncompressed)
	if err != nil {
		return errors.Wrapf(err, "error reading container directory %q", c.ID())
	}

	outFile, err := os.Create(path)
	if err != nil {
		return errors.Wrapf(err, "error creating file %q", path)
	}
	defer outFile.Close()

	_, err = io.Copy(outFile, input)
	return err
}

// AddArtifact creates and writes to an artifact file for the container
func (c *Container) AddArtifact(name string, data []byte) error {
	return ioutil.WriteFile(c.getArtifactPath(name), data, 0740)
}

// GetArtifact reads the specified artifact file from the container
func (c *Container) GetArtifact(name string) ([]byte, error) {
	return ioutil.ReadFile(c.getArtifactPath(name))
}

// RemoveArtifact deletes the specified artifacts file
func (c *Container) RemoveArtifact(name string) error {
	return os.Remove(c.getArtifactPath(name))
}

func (c *Container) getArtifactPath(name string) string {
	return filepath.Join(c.config.StaticDir, artifactsDir, name)
}

// Inspect a container for low-level information
func (c *Container) Inspect(size bool) (*ContainerInspectData, error) {
	c.lock.Lock()
	defer c.lock.Unlock()

	if err := c.syncContainer(); err != nil {
		return nil, err
	}

	storeCtr, err := c.runtime.store.Container(c.ID())
	if err != nil {
		return nil, errors.Wrapf(err, "error getting container from store %q", c.ID())
	}
	layer, err := c.runtime.store.Layer(storeCtr.LayerID)
	if err != nil {
		return nil, errors.Wrapf(err, "error reading information about layer %q", storeCtr.LayerID)
	}
	driverData, err := driver.GetDriverData(c.runtime.store, layer.ID)
	if err != nil {
		return nil, errors.Wrapf(err, "error getting graph driver info %q", c.ID())
	}

	return c.getContainerInspectData(size, driverData)
}

// Commit commits the changes between a container and its image, creating a new
// image
func (c *Container) Commit(pause bool, options CopyOptions) error {
	c.lock.Lock()
	defer c.lock.Unlock()

	if err := c.syncContainer(); err != nil {
		return err
	}

	if c.state.State == ContainerStateRunning && pause {
		if err := c.runtime.ociRuntime.pauseContainer(c); err != nil {
			return errors.Wrapf(err, "error pausing container %q", c.ID())
		}
		defer func() {
			if err := c.runtime.ociRuntime.unpauseContainer(c); err != nil {
				logrus.Errorf("error unpausing container %q: %v", c.ID(), err)
			}
		}()
	}

	tempFile, err := ioutil.TempFile(c.runtime.config.TmpDir, "podman-commit")
	if err != nil {
		return errors.Wrapf(err, "error creating temp file")
	}
	defer os.Remove(tempFile.Name())
	defer tempFile.Close()

	if err := c.export(tempFile.Name()); err != nil {
		return err
	}
	return c.runtime.ImportImage(tempFile.Name(), options)
}

// Wait blocks on a container to exit and returns its exit code
func (c *Container) Wait() (int32, error) {
	err := wait.PollImmediateInfinite(1,
		func() (bool, error) {
			stopped, err := c.isStopped()
			if err != nil {
				return false, err
			}
			if !stopped {
				return false, nil
			} else { // nolint
				return true, nil // nolint
			} // nolint
		},
	)
	if err != nil {
		return 0, err
	}
	exitCode := c.state.ExitCode
	return exitCode, nil
}

func (c *Container) isStopped() (bool, error) {
	c.lock.Lock()
	defer c.lock.Unlock()
	err := c.syncContainer()
	if err != nil {
		return true, err
	}
	return c.state.State == ContainerStateStopped, nil
}

// save container state to the database
func (c *Container) save() error {
	if err := c.runtime.state.SaveContainer(c); err != nil {
		return errors.Wrapf(err, "error saving container %s state", c.ID())
	}
	return nil
}

// mountStorage sets up the container's root filesystem
// It mounts the image and any other requested mounts
// TODO: Add ability to override mount label so we can use this for Mount() too
// TODO: Can we use this for export? Copying SHM into the export might not be
// good
func (c *Container) mountStorage() (err error) {
	// Container already mounted, nothing to do
	if c.state.Mounted {
		return nil
	}

	// TODO: generalize this mount code so it will mount every mount in ctr.config.Mounts

	mounted, err := mount.Mounted(c.config.ShmDir)
	if err != nil {
		return errors.Wrapf(err, "unable to determine if %q is mounted", c.config.ShmDir)
	}

	if !mounted {
		shmOptions := "mode=1777,size=" + strconv.Itoa(DefaultShmSize)
		if err := unix.Mount("shm", c.config.ShmDir, "tmpfs", unix.MS_NOEXEC|unix.MS_NOSUID|unix.MS_NODEV,
			label.FormatMountLabel(shmOptions, c.config.MountLabel)); err != nil {
			return errors.Wrapf(err, "failed to mount shm tmpfs %q", c.config.ShmDir)
		}
	}

	mountPoint, err := c.runtime.storageService.MountContainerImage(c.ID())
	if err != nil {
		return errors.Wrapf(err, "error mounting storage for container %s", c.ID())
	}
	c.state.Mounted = true
	c.state.Mountpoint = mountPoint

	logrus.Debugf("Created root filesystem for container %s at %s", c.ID(), c.state.Mountpoint)

	defer func() {
		if err != nil {
			if err2 := c.cleanupStorage(); err2 != nil {
				logrus.Errorf("Error unmounting storage for container %s: %v", c.ID(), err)
			}
		}
	}()

	return c.save()
}

// CleanupStorage unmounts all mount points in container and cleans up container storage
func (c *Container) CleanupStorage() error {
	c.lock.Lock()
	defer c.lock.Unlock()
	if err := c.syncContainer(); err != nil {
		return err
	}
	return c.cleanupStorage()
}

// cleanupStorage unmounts and cleans up the container's root filesystem
func (c *Container) cleanupStorage() error {
	if !c.state.Mounted {
		// Already unmounted, do nothing
		return nil
	}

	for _, mount := range c.config.Mounts {
		if err := unix.Unmount(mount, unix.MNT_DETACH); err != nil {
			if err != syscall.EINVAL {
				logrus.Warnf("container %s failed to unmount %s : %v", c.ID(), mount, err)
			}
		}
	}

	// Also unmount storage
	if err := c.runtime.storageService.UnmountContainerImage(c.ID()); err != nil {
		return errors.Wrapf(err, "error unmounting container %s root filesystem", c.ID())
	}

	c.state.Mountpoint = ""
	c.state.Mounted = false

	return c.save()
}

// CGroupPath returns a cgroups "path" for a given container.
func (c *Container) CGroupPath() cgroups.Path {
	return cgroups.StaticPath(filepath.Join(CGroupParent, fmt.Sprintf("libpod-conmon-%s", c.ID())))
}

// copyHostFileToRundir copies the provided file to the runtimedir
func (c *Container) copyHostFileToRundir(sourcePath string) (string, error) {
	destFileName := filepath.Join(c.state.RunDir, filepath.Base(sourcePath))
	if err := fileutils.CopyFile(sourcePath, destFileName); err != nil {
		return "", err
	}
	// Relabel runDirResolv for the container
	if err := label.Relabel(destFileName, c.config.MountLabel, false); err != nil {
		return "", err
	}
	return destFileName, nil
}

// StopTimeout returns a stop timeout field for this container
func (c *Container) StopTimeout() uint {
	return c.config.StopTimeout
}