summaryrefslogtreecommitdiff
path: root/libpod/runtime_ctr.go
blob: 6c487e367215d11f73f51afb641a809807bc4e26 (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
package libpod

import (
	"context"
	"os"
	"path"
	"path/filepath"
	"strings"
	"time"

	"github.com/containers/storage"
	"github.com/containers/storage/pkg/stringid"
	spec "github.com/opencontainers/runtime-spec/specs-go"
	"github.com/opencontainers/selinux/go-selinux/label"
	"github.com/pkg/errors"
	"github.com/sirupsen/logrus"
	"github.com/ulule/deepcopier"
)

// CtrRemoveTimeout is the default number of seconds to wait after stopping a container
// before sending the kill signal
const CtrRemoveTimeout = 10

// Contains the public Runtime API for containers

// A CtrCreateOption is a functional option which alters the Container created
// by NewContainer
type CtrCreateOption func(*Container) error

// ContainerFilter is a function to determine whether a container is included
// in command output. Containers to be outputted are tested using the function.
// A true return will include the container, a false return will exclude it.
type ContainerFilter func(*Container) bool

// NewContainer creates a new container from a given OCI config
func (r *Runtime) NewContainer(ctx context.Context, rSpec *spec.Spec, options ...CtrCreateOption) (c *Container, err error) {
	r.lock.Lock()
	defer r.lock.Unlock()
	if !r.valid {
		return nil, ErrRuntimeStopped
	}
	return r.newContainer(ctx, rSpec, options...)
}

func (r *Runtime) newContainer(ctx context.Context, rSpec *spec.Spec, options ...CtrCreateOption) (c *Container, err 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(containerState)

	ctr.config.ID = stringid.GenerateNonCryptoID()

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

	ctr.config.ShmSize = DefaultShmSize

	ctr.state.BindMounts = make(map[string]string)

	// Path our lock file will reside at
	lockPath := filepath.Join(r.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

	ctr.config.StopTimeout = CtrRemoveTimeout

	// Set namespace based on current runtime namespace
	// Do so before options run so they can override it
	if r.config.Namespace != "" {
		ctr.config.Namespace = r.config.Namespace
	}

	ctr.runtime = r
	for _, option := range options {
		if err := option(ctr); err != nil {
			return nil, errors.Wrapf(err, "error running container create option")
		}
	}

	ctr.valid = true
	ctr.state.State = ContainerStateConfigured

	var pod *Pod
	if ctr.config.Pod != "" {
		// Get the pod from state
		pod, err = r.state.Pod(ctr.config.Pod)
		if err != nil {
			return nil, errors.Wrapf(err, "cannot add container %s to pod %s", ctr.ID(), ctr.config.Pod)
		}
	}

	if ctr.config.Name == "" {
		name, err := r.generateName()
		if err != nil {
			return nil, err
		}

		ctr.config.Name = name
	}

	// Check CGroup parent sanity, and set it if it was not set
	switch r.config.CgroupManager {
	case CgroupfsCgroupsManager:
		if ctr.config.CgroupParent == "" {
			if pod != nil && pod.config.UsePodCgroup {
				podCgroup, err := pod.CgroupPath()
				if err != nil {
					return nil, errors.Wrapf(err, "error retrieving pod %s cgroup", pod.ID())
				}
				if podCgroup == "" {
					return nil, errors.Wrapf(ErrInternal, "pod %s cgroup is not set", pod.ID())
				}
				ctr.config.CgroupParent = podCgroup
			} else {
				ctr.config.CgroupParent = CgroupfsDefaultCgroupParent
			}
		} else if strings.HasSuffix(path.Base(ctr.config.CgroupParent), ".slice") {
			return nil, errors.Wrapf(ErrInvalidArg, "systemd slice received as cgroup parent when using cgroupfs")
		}
	case SystemdCgroupsManager:
		if ctr.config.CgroupParent == "" {
			if pod != nil && pod.config.UsePodCgroup {
				podCgroup, err := pod.CgroupPath()
				if err != nil {
					return nil, errors.Wrapf(err, "error retrieving pod %s cgroup", pod.ID())
				}
				ctr.config.CgroupParent = podCgroup
			} else {
				ctr.config.CgroupParent = SystemdDefaultCgroupParent
			}
		} else if len(ctr.config.CgroupParent) < 6 || !strings.HasSuffix(path.Base(ctr.config.CgroupParent), ".slice") {
			return nil, errors.Wrapf(ErrInvalidArg, "did not receive systemd slice as cgroup parent when using systemd to manage cgroups")
		}
	default:
		return nil, errors.Wrapf(ErrInvalidArg, "unsupported CGroup manager: %s - cannot validate cgroup parent", r.config.CgroupManager)
	}

	// Set up storage for the container
	if err := ctr.setupStorage(ctx); err != nil {
		return nil, err
	}
	defer func() {
		if err != nil {
			if err2 := ctr.teardownStorage(); err2 != nil {
				logrus.Errorf("Error removing partially-created container root filesystem: %s", err2)
			}
		}
	}()

	if ctr.config.LogPath == "" {
		ctr.config.LogPath = filepath.Join(ctr.config.StaticDir, "ctr.log")
	}
	if ctr.config.ShmDir == "" {
		if ctr.state.UserNSRoot == "" {
			ctr.config.ShmDir = filepath.Join(ctr.bundlePath(), "shm")
		} else {
			ctr.config.ShmDir = filepath.Join(ctr.state.UserNSRoot, "shm")
		}
		if err := os.MkdirAll(ctr.config.ShmDir, 0700); err != nil {
			if !os.IsExist(err) {
				return nil, errors.Wrapf(err, "unable to create shm %q dir", ctr.config.ShmDir)
			}
		}
		ctr.config.Mounts = append(ctr.config.Mounts, ctr.config.ShmDir)
	}
	// Add the container to the state
	// TODO: May be worth looking into recovering from name/ID collisions here
	if ctr.config.Pod != "" {
		// Lock the pod to ensure we can't add containers to pods
		// being removed
		pod.lock.Lock()
		defer pod.lock.Unlock()

		if err := r.state.AddContainerToPod(pod, ctr); err != nil {
			return nil, err
		}
	} else {
		if err := r.state.AddContainer(ctr); err != nil {
			return nil, err
		}
	}
	return ctr, nil
}

// RemoveContainer removes the given container
// If force is specified, the container will be stopped first
// Otherwise, RemoveContainer will return an error if the container is running
func (r *Runtime) RemoveContainer(ctx context.Context, c *Container, force bool) error {
	r.lock.Lock()
	defer r.lock.Unlock()

	return r.removeContainer(ctx, c, force)
}

// Internal function to remove a container
// Locks the container, but does not lock the runtime
func (r *Runtime) removeContainer(ctx context.Context, c *Container, force bool) error {
	if !c.valid {
		if ok, _ := r.state.HasContainer(c.ID()); !ok {
			// Container probably already removed
			// Or was never in the runtime to begin with
			return nil
		}
	}

	// We need to lock the pod before we lock the container
	// To avoid races around removing a container and the pod it is in
	var pod *Pod
	var err error
	if c.config.Pod != "" {
		pod, err = r.state.Pod(c.config.Pod)
		if err != nil {
			return errors.Wrapf(err, "container %s is in pod %s, but pod cannot be retrieved", c.ID(), pod.ID())
		}

		// Lock the pod while we're removing container
		pod.lock.Lock()
		defer pod.lock.Unlock()
		if err := pod.updatePod(); err != nil {
			return err
		}

		infraID := pod.state.InfraContainerID
		if c.ID() == infraID {
			return errors.Errorf("container %s is the infra container of pod %s and cannot be removed without removing the pod", c.ID(), pod.ID())
		}
	}

	c.lock.Lock()
	defer c.lock.Unlock()

	if !r.valid {
		return ErrRuntimeStopped
	}

	// Update the container to get current state
	if err := c.syncContainer(); err != nil {
		return err
	}

	if c.state.State == ContainerStatePaused {
		return errors.Wrapf(ErrCtrStateInvalid, "container %s is paused, cannot remove until unpaused", c.ID())
	}

	// Check that the container's in a good state to be removed
	if c.state.State == ContainerStateRunning && force {
		if err := r.ociRuntime.stopContainer(c, c.StopTimeout()); err != nil {
			return errors.Wrapf(err, "cannot remove container %s as it could not be stopped", c.ID())
		}

		// Need to update container state to make sure we know it's stopped
		if err := c.syncContainer(); err != nil {
			return err
		}
	} else if !(c.state.State == ContainerStateConfigured ||
		c.state.State == ContainerStateCreated ||
		c.state.State == ContainerStateStopped) {
		return errors.Wrapf(ErrCtrStateInvalid, "cannot remove container %s as it is %s - running or paused containers cannot be removed", c.ID(), c.state.State.String())
	}

	// Check that all of our exec sessions have finished
	if len(c.state.ExecSessions) != 0 {
		if force {
			if err := r.ociRuntime.execStopContainer(c, c.StopTimeout()); err != nil {
				return err
			}
		} else {
			return errors.Wrapf(ErrCtrStateInvalid, "cannot remove container %s as it has active exec sessions", c.ID())
		}
	}

	// Check that no other containers depend on the container
	deps, err := r.state.ContainerInUse(c)
	if err != nil {
		return err
	}
	if len(deps) != 0 {
		depsStr := strings.Join(deps, ", ")
		return errors.Wrapf(ErrCtrExists, "container %s has dependent containers which must be removed before it: %s", c.ID(), depsStr)
	}

	var cleanupErr error
	// Remove the container from the state
	if c.config.Pod != "" {
		if err := r.state.RemoveContainerFromPod(pod, c); err != nil {
			if cleanupErr == nil {
				cleanupErr = err
			} else {
				logrus.Errorf("removing container from pod: %v", err)
			}
		}
	} else {
		if err := r.state.RemoveContainer(c); err != nil {
			if cleanupErr == nil {
				cleanupErr = err
			} else {
				logrus.Errorf("removing container: %v", err)
			}
		}
	}

	// Set container as invalid so it can no longer be used
	c.valid = false

	// Clean up network namespace, cgroups, mounts
	if err := c.cleanup(); err != nil {
		if cleanupErr == nil {
			cleanupErr = err
		} else {
			logrus.Errorf("cleanup network, cgroups, mounts: %v", err)
		}
	}

	// Stop the container's storage
	if err := c.teardownStorage(); err != nil {
		if cleanupErr == nil {
			cleanupErr = err
		} else {
			logrus.Errorf("cleanup storage: %v", err)
		}
	}

	if r.config.EnableLabeling {
		label.ReleaseLabel(c.ProcessLabel())
		r.reserveLabels()
	}
	// Delete the container
	// Only do this if we're not ContainerStateConfigured - if we are,
	// we haven't been created in the runtime yet
	if c.state.State != ContainerStateConfigured {
		if err := c.delete(ctx); err != nil {
			if cleanupErr == nil {
				cleanupErr = err
			} else {
				logrus.Errorf("delete container: %v", err)
			}
		}
	}

	return cleanupErr
}

// GetContainer retrieves a container by its ID
func (r *Runtime) GetContainer(id string) (*Container, error) {
	r.lock.RLock()
	defer r.lock.RUnlock()

	if !r.valid {
		return nil, ErrRuntimeStopped
	}

	return r.state.Container(id)
}

// HasContainer checks if a container with the given ID is present
func (r *Runtime) HasContainer(id string) (bool, error) {
	r.lock.RLock()
	defer r.lock.RUnlock()

	if !r.valid {
		return false, ErrRuntimeStopped
	}

	return r.state.HasContainer(id)
}

// LookupContainer looks up a container by its name or a partial ID
// If a partial ID is not unique, an error will be returned
func (r *Runtime) LookupContainer(idOrName string) (*Container, error) {
	r.lock.RLock()
	defer r.lock.RUnlock()

	if !r.valid {
		return nil, ErrRuntimeStopped
	}
	return r.state.LookupContainer(idOrName)
}

// GetContainers retrieves all containers from the state
// Filters can be provided which will determine what containers are included in
// the output. Multiple filters are handled by ANDing their output, so only
// containers matching all filters are returned
func (r *Runtime) GetContainers(filters ...ContainerFilter) ([]*Container, error) {
	r.lock.RLock()
	defer r.lock.RUnlock()

	if !r.valid {
		return nil, ErrRuntimeStopped
	}

	ctrs, err := r.state.AllContainers()
	if err != nil {
		return nil, err
	}

	ctrsFiltered := make([]*Container, 0, len(ctrs))

	for _, ctr := range ctrs {
		include := true
		for _, filter := range filters {
			include = include && filter(ctr)
		}

		if include {
			ctrsFiltered = append(ctrsFiltered, ctr)
		}
	}

	return ctrsFiltered, nil
}

// GetAllContainers is a helper function for GetContainers
func (r *Runtime) GetAllContainers() ([]*Container, error) {
	return r.state.AllContainers()
}

// GetRunningContainers is a helper function for GetContainers
func (r *Runtime) GetRunningContainers() ([]*Container, error) {
	running := func(c *Container) bool {
		state, _ := c.State()
		return state == ContainerStateRunning
	}
	return r.GetContainers(running)
}

// GetContainersByList is a helper function for GetContainers
// which takes a []string of container IDs or names
func (r *Runtime) GetContainersByList(containers []string) ([]*Container, error) {
	var ctrs []*Container
	for _, inputContainer := range containers {
		ctr, err := r.LookupContainer(inputContainer)
		if err != nil {
			return ctrs, errors.Wrapf(err, "unable to lookup container %s", inputContainer)
		}
		ctrs = append(ctrs, ctr)
	}
	return ctrs, nil
}

// GetLatestContainer returns a container object of the latest created container.
func (r *Runtime) GetLatestContainer() (*Container, error) {
	lastCreatedIndex := -1
	var lastCreatedTime time.Time
	ctrs, err := r.GetAllContainers()
	if err != nil {
		return nil, errors.Wrapf(err, "unable to find latest container")
	}
	if len(ctrs) == 0 {
		return nil, ErrNoSuchCtr
	}
	for containerIndex, ctr := range ctrs {
		createdTime := ctr.config.CreatedTime
		if createdTime.After(lastCreatedTime) {
			lastCreatedTime = createdTime
			lastCreatedIndex = containerIndex
		}
	}
	return ctrs[lastCreatedIndex], nil
}

// reserveLabels walks the list o fcontainers and reserves the label, so new containers will not
// get them.
// TODO Performance wise this should only run if the state has changed since the last time it was run.
func (r *Runtime) reserveLabels() error {
	containers, err := r.state.AllContainers()
	if err != nil {
		return err
	}
	for _, ctr := range containers {
		label.ReserveLabel(ctr.ProcessLabel())
	}
	return nil
}

// initLabels allocates an new label to return to the caller
func (r *Runtime) initLabels(labelOpts []string) (string, string, error) {
	if !r.config.EnableLabeling {
		return "", "", nil
	}
	if err := r.reserveLabels(); err != nil {
		return "", "", errors.Wrapf(err, "unable to reserve labels")
	}
	return label.InitLabels(labelOpts)
}