summaryrefslogtreecommitdiff
path: root/libpod/kube.go
blob: 15cc056f6fed2416f0f1dca224e4f5e5b20ee1de (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
package libpod

import (
	"math/rand"
	"os"
	"strconv"
	"strings"
	"time"

	"github.com/containers/libpod/libpod/define"
	"github.com/containers/libpod/pkg/lookup"
	"github.com/containers/libpod/pkg/util"
	"github.com/cri-o/ocicni/pkg/ocicni"
	"github.com/opencontainers/runtime-spec/specs-go"
	"github.com/opencontainers/runtime-tools/generate"
	"github.com/pkg/errors"
	"github.com/sirupsen/logrus"
	v1 "k8s.io/api/core/v1"
	v12 "k8s.io/apimachinery/pkg/apis/meta/v1"
)

// GenerateForKube takes a slice of libpod containers and generates
// one v1.Pod description that includes just a single container.
func (c *Container) GenerateForKube() (*v1.Pod, error) {
	// Generate the v1.Pod yaml description
	return simplePodWithV1Container(c)
}

// GenerateForKube takes a slice of libpod containers and generates
// one v1.Pod description
func (p *Pod) GenerateForKube() (*v1.Pod, []v1.ServicePort, error) {
	// Generate the v1.Pod yaml description
	var (
		servicePorts []v1.ServicePort
		ports        []v1.ContainerPort
	)

	allContainers, err := p.allContainers()
	if err != nil {
		return nil, servicePorts, err
	}
	// If the pod has no containers, no sense to generate YAML
	if len(allContainers) == 0 {
		return nil, servicePorts, errors.Errorf("pod %s has no containers", p.ID())
	}
	// If only an infra container is present, makes no sense to generate YAML
	if len(allContainers) == 1 && p.HasInfraContainer() {
		return nil, servicePorts, errors.Errorf("pod %s only has an infra container", p.ID())
	}

	if p.HasInfraContainer() {
		infraContainer, err := p.getInfraContainer()
		if err != nil {
			return nil, servicePorts, err
		}

		ports, err = ocicniPortMappingToContainerPort(infraContainer.config.PortMappings)
		if err != nil {
			return nil, servicePorts, err
		}
		servicePorts = containerPortsToServicePorts(ports)
	}
	pod, err := p.podWithContainers(allContainers, ports)
	return pod, servicePorts, err
}

func (p *Pod) getInfraContainer() (*Container, error) {
	infraID, err := p.InfraContainerID()
	if err != nil {
		return nil, err
	}
	return p.runtime.GetContainer(infraID)
}

// GenerateKubeServiceFromV1Pod creates a v1 service object from a v1 pod object
func GenerateKubeServiceFromV1Pod(pod *v1.Pod, servicePorts []v1.ServicePort) v1.Service {
	service := v1.Service{}
	selector := make(map[string]string)
	selector["app"] = pod.Labels["app"]
	ports := servicePorts
	if len(ports) == 0 {
		ports = containersToServicePorts(pod.Spec.Containers)
	}
	serviceSpec := v1.ServiceSpec{
		Ports:    ports,
		Selector: selector,
		Type:     v1.ServiceTypeNodePort,
	}
	service.Spec = serviceSpec
	service.ObjectMeta = pod.ObjectMeta
	tm := v12.TypeMeta{
		Kind:       "Service",
		APIVersion: pod.TypeMeta.APIVersion,
	}
	service.TypeMeta = tm
	return service
}

// containerPortsToServicePorts takes a slice of containerports and generates a
// slice of service ports
func containerPortsToServicePorts(containerPorts []v1.ContainerPort) []v1.ServicePort {
	var sps []v1.ServicePort
	for _, cp := range containerPorts {
		nodePort := 30000 + rand.Intn(32767-30000+1)
		servicePort := v1.ServicePort{
			Protocol: cp.Protocol,
			Port:     cp.ContainerPort,
			NodePort: int32(nodePort),
			Name:     strconv.Itoa(int(cp.ContainerPort)),
		}
		sps = append(sps, servicePort)
	}
	return sps
}

// containersToServicePorts takes a slice of v1.Containers and generates an
// inclusive list of serviceports to expose
func containersToServicePorts(containers []v1.Container) []v1.ServicePort {
	var sps []v1.ServicePort
	// Without the call to rand.Seed, a program will produce the same sequence of pseudo-random numbers
	// for each execution. Legal nodeport range is 30000-32767
	rand.Seed(time.Now().UnixNano())

	for _, ctr := range containers {
		sps = append(sps, containerPortsToServicePorts(ctr.Ports)...)
	}
	return sps
}

func (p *Pod) podWithContainers(containers []*Container, ports []v1.ContainerPort) (*v1.Pod, error) {
	var (
		podContainers []v1.Container
	)
	deDupPodVolumes := make(map[string]*v1.Volume)
	first := true
	for _, ctr := range containers {
		if !ctr.IsInfra() {
			ctr, volumes, err := containerToV1Container(ctr)
			if err != nil {
				return nil, err
			}

			// Since port bindings for the pod are handled by the
			// infra container, wipe them here.
			ctr.Ports = nil

			// We add the original port declarations from the libpod infra container
			// to the first kubernetes container description because otherwise we loose
			// the original container/port bindings.
			if first && len(ports) > 0 {
				ctr.Ports = ports
				first = false
			}
			podContainers = append(podContainers, ctr)
			// Deduplicate volumes, so if containers in the pod share a volume, it's only
			// listed in the volumes section once
			for _, vol := range volumes {
				vol := vol
				deDupPodVolumes[vol.Name] = &vol
			}
		}
	}
	podVolumes := make([]v1.Volume, 0, len(deDupPodVolumes))
	for _, vol := range deDupPodVolumes {
		podVolumes = append(podVolumes, *vol)
	}

	return addContainersAndVolumesToPodObject(podContainers, podVolumes, p.Name()), nil
}

func addContainersAndVolumesToPodObject(containers []v1.Container, volumes []v1.Volume, podName string) *v1.Pod {
	tm := v12.TypeMeta{
		Kind:       "Pod",
		APIVersion: "v1",
	}

	// Add a label called "app" with the containers name as a value
	labels := make(map[string]string)
	labels["app"] = removeUnderscores(podName)
	om := v12.ObjectMeta{
		// The name of the pod is container_name-libpod
		Name:   removeUnderscores(podName),
		Labels: labels,
		// CreationTimestamp seems to be required, so adding it; in doing so, the timestamp
		// will reflect time this is run (not container create time) because the conversion
		// of the container create time to v1 Time is probably not warranted nor worthwhile.
		CreationTimestamp: v12.Now(),
	}
	ps := v1.PodSpec{
		Containers: containers,
		Volumes:    volumes,
	}
	p := v1.Pod{
		TypeMeta:   tm,
		ObjectMeta: om,
		Spec:       ps,
	}
	return &p
}

// simplePodWithV1Container is a function used by inspect when kube yaml needs to be generated
// for a single container.  we "insert" that container description in a pod.
func simplePodWithV1Container(ctr *Container) (*v1.Pod, error) {
	var containers []v1.Container
	kubeCtr, kubeVols, err := containerToV1Container(ctr)
	if err != nil {
		return nil, err
	}
	containers = append(containers, kubeCtr)
	return addContainersAndVolumesToPodObject(containers, kubeVols, ctr.Name()), nil

}

// containerToV1Container converts information we know about a libpod container
// to a V1.Container specification.
func containerToV1Container(c *Container) (v1.Container, []v1.Volume, error) {
	kubeContainer := v1.Container{}
	kubeVolumes := []v1.Volume{}
	kubeSec, err := generateKubeSecurityContext(c)
	if err != nil {
		return kubeContainer, kubeVolumes, err
	}

	if len(c.config.Spec.Linux.Devices) > 0 {
		// TODO Enable when we can support devices and their names
		devices, err := generateKubeVolumeDeviceFromLinuxDevice(c.Spec().Linux.Devices)
		if err != nil {
			return kubeContainer, kubeVolumes, err
		}
		kubeContainer.VolumeDevices = devices
		return kubeContainer, kubeVolumes, errors.Wrapf(define.ErrNotImplemented, "linux devices")
	}

	if len(c.config.UserVolumes) > 0 {
		// TODO When we until we can resolve what the volume name should be, this is disabled
		// Volume names need to be coordinated "globally" in the kube files.
		volumeMounts, volumes, err := libpodMountsToKubeVolumeMounts(c)
		if err != nil {
			return kubeContainer, kubeVolumes, err
		}
		kubeContainer.VolumeMounts = volumeMounts
		kubeVolumes = append(kubeVolumes, volumes...)
	}

	envVariables, err := libpodEnvVarsToKubeEnvVars(c.config.Spec.Process.Env)
	if err != nil {
		return kubeContainer, kubeVolumes, err
	}

	portmappings, err := c.PortMappings()
	if err != nil {
		return kubeContainer, kubeVolumes, err
	}
	ports, err := ocicniPortMappingToContainerPort(portmappings)
	if err != nil {
		return kubeContainer, kubeVolumes, err
	}

	containerCommands := c.Command()
	kubeContainer.Name = removeUnderscores(c.Name())

	_, image := c.Image()
	kubeContainer.Image = image
	kubeContainer.Stdin = c.Stdin()
	kubeContainer.Command = containerCommands
	// TODO need to figure out how we handle command vs entry point.  Kube appears to prefer entrypoint.
	// right now we just take the container's command
	//container.Args = args
	kubeContainer.WorkingDir = c.WorkingDir()
	kubeContainer.Ports = ports
	// This should not be applicable
	//container.EnvFromSource =
	kubeContainer.Env = envVariables
	// TODO enable resources when we can support naming conventions
	//container.Resources
	kubeContainer.SecurityContext = kubeSec
	kubeContainer.StdinOnce = false
	kubeContainer.TTY = c.config.Spec.Process.Terminal

	return kubeContainer, kubeVolumes, nil
}

// ocicniPortMappingToContainerPort takes an ocicni portmapping and converts
// it to a v1.ContainerPort format for kube output
func ocicniPortMappingToContainerPort(portMappings []ocicni.PortMapping) ([]v1.ContainerPort, error) {
	var containerPorts []v1.ContainerPort
	for _, p := range portMappings {
		var protocol v1.Protocol
		switch strings.ToUpper(p.Protocol) {
		case "TCP":
			protocol = v1.ProtocolTCP
		case "UDP":
			protocol = v1.ProtocolUDP
		default:
			return containerPorts, errors.Errorf("unknown network protocol %s", p.Protocol)
		}
		cp := v1.ContainerPort{
			// Name will not be supported
			HostPort:      p.HostPort,
			HostIP:        p.HostIP,
			ContainerPort: p.ContainerPort,
			Protocol:      protocol,
		}
		containerPorts = append(containerPorts, cp)
	}
	return containerPorts, nil
}

// libpodEnvVarsToKubeEnvVars converts a key=value string slice to []v1.EnvVar
func libpodEnvVarsToKubeEnvVars(envs []string) ([]v1.EnvVar, error) {
	var envVars []v1.EnvVar
	for _, e := range envs {
		splitE := strings.SplitN(e, "=", 2)
		if len(splitE) != 2 {
			return envVars, errors.Errorf("environment variable %s is malformed; should be key=value", e)
		}
		ev := v1.EnvVar{
			Name:  splitE[0],
			Value: splitE[1],
		}
		envVars = append(envVars, ev)
	}
	return envVars, nil
}

// libpodMountsToKubeVolumeMounts converts the containers mounts to a struct kube understands
func libpodMountsToKubeVolumeMounts(c *Container) ([]v1.VolumeMount, []v1.Volume, error) {
	var vms []v1.VolumeMount
	var vos []v1.Volume

	// TjDO when named volumes are supported in play kube, also parse named volumes here
	_, mounts := c.sortUserVolumes(c.config.Spec)
	for _, m := range mounts {
		vm, vo, err := generateKubeVolumeMount(m)
		if err != nil {
			return vms, vos, err
		}
		vms = append(vms, vm)
		vos = append(vos, vo)
	}
	return vms, vos, nil
}

// generateKubeVolumeMount takes a user specified mount and returns
// a kubernetes VolumeMount (to be added to the container) and a kubernetes Volume
// (to be added to the pod)
func generateKubeVolumeMount(m specs.Mount) (v1.VolumeMount, v1.Volume, error) {
	vm := v1.VolumeMount{}
	vo := v1.Volume{}

	name, err := convertVolumePathToName(m.Source)
	if err != nil {
		return vm, vo, err
	}
	vm.Name = name
	vm.MountPath = m.Destination
	if util.StringInSlice("ro", m.Options) {
		vm.ReadOnly = true
	}

	vo.Name = name
	vo.HostPath = &v1.HostPathVolumeSource{}
	vo.HostPath.Path = m.Source
	isDir, err := isHostPathDirectory(m.Source)
	// neither a directory or a file lives here, default to creating a directory
	// TODO should this be an error instead?
	var hostPathType v1.HostPathType
	switch {
	case err != nil:
		hostPathType = v1.HostPathDirectoryOrCreate
	case isDir:
		hostPathType = v1.HostPathDirectory
	default:
		hostPathType = v1.HostPathFile
	}
	vo.HostPath.Type = &hostPathType

	return vm, vo, nil
}

func isHostPathDirectory(hostPathSource string) (bool, error) {
	info, err := os.Stat(hostPathSource)
	if err != nil {
		return false, err
	}
	return info.Mode().IsDir(), nil
}

func convertVolumePathToName(hostSourcePath string) (string, error) {
	if len(hostSourcePath) == 0 {
		return "", errors.Errorf("hostSourcePath must be specified to generate volume name")
	}
	if len(hostSourcePath) == 1 {
		if hostSourcePath != "/" {
			return "", errors.Errorf("hostSourcePath malformatted: %s", hostSourcePath)
		}
		// add special case name
		return "root", nil
	}
	// First, trim trailing slashes, then replace slashes with dashes.
	// Thus, /mnt/data/ will become mnt-data
	return strings.Replace(strings.Trim(hostSourcePath, "/"), "/", "-", -1), nil
}

func determineCapAddDropFromCapabilities(defaultCaps, containerCaps []string) *v1.Capabilities {
	var (
		drop []v1.Capability
		add  []v1.Capability
	)
	dedupDrop := make(map[string]bool)
	dedupAdd := make(map[string]bool)
	// Find caps in the defaultCaps but not in the container's
	// those indicate a dropped cap
	for _, capability := range defaultCaps {
		if !util.StringInSlice(capability, containerCaps) {
			if _, ok := dedupDrop[capability]; !ok {
				drop = append(drop, v1.Capability(capability))
				dedupDrop[capability] = true
			}
		}
	}
	// Find caps in the container but not in the defaults; those indicate
	// an added cap
	for _, capability := range containerCaps {
		if !util.StringInSlice(capability, defaultCaps) {
			if _, ok := dedupAdd[capability]; !ok {
				add = append(add, v1.Capability(capability))
				dedupAdd[capability] = true
			}
		}
	}

	return &v1.Capabilities{
		Add:  add,
		Drop: drop,
	}
}

func capAddDrop(caps *specs.LinuxCapabilities) (*v1.Capabilities, error) {
	g, err := generate.New("linux")
	if err != nil {
		return nil, err
	}
	// Combine all the default capabilities into a slice
	defaultCaps := append(g.Config.Process.Capabilities.Ambient, g.Config.Process.Capabilities.Bounding...)
	defaultCaps = append(defaultCaps, g.Config.Process.Capabilities.Effective...)
	defaultCaps = append(defaultCaps, g.Config.Process.Capabilities.Inheritable...)
	defaultCaps = append(defaultCaps, g.Config.Process.Capabilities.Permitted...)

	// Combine all the container's capabilities into a slic
	containerCaps := append(caps.Ambient, caps.Bounding...)
	containerCaps = append(containerCaps, caps.Effective...)
	containerCaps = append(containerCaps, caps.Inheritable...)
	containerCaps = append(containerCaps, caps.Permitted...)

	calculatedCaps := determineCapAddDropFromCapabilities(defaultCaps, containerCaps)
	return calculatedCaps, nil
}

// generateKubeSecurityContext generates a securityContext based on the existing container
func generateKubeSecurityContext(c *Container) (*v1.SecurityContext, error) {
	priv := c.Privileged()
	ro := c.IsReadOnly()
	allowPrivEscalation := !c.config.Spec.Process.NoNewPrivileges

	newCaps, err := capAddDrop(c.config.Spec.Process.Capabilities)
	if err != nil {
		return nil, err
	}

	sc := v1.SecurityContext{
		Capabilities: newCaps,
		Privileged:   &priv,
		// TODO How do we know if selinux were passed into podman
		//SELinuxOptions:
		// RunAsNonRoot is an optional parameter; our first implementations should be root only; however
		// I'm leaving this as a bread-crumb for later
		//RunAsNonRoot:             &nonRoot,
		ReadOnlyRootFilesystem:   &ro,
		AllowPrivilegeEscalation: &allowPrivEscalation,
	}

	if c.User() != "" {
		if !c.batched {
			c.lock.Lock()
			defer c.lock.Unlock()
		}
		if err := c.syncContainer(); err != nil {
			return nil, errors.Wrapf(err, "unable to sync container during YAML generation")
		}

		logrus.Debugf("Looking in container for user: %s", c.User())
		execUser, err := lookup.GetUserGroupInfo(c.state.Mountpoint, c.User(), nil)
		if err != nil {
			return nil, err
		}
		uid := int64(execUser.Uid)
		gid := int64(execUser.Gid)
		sc.RunAsUser = &uid
		sc.RunAsGroup = &gid
	}
	return &sc, nil
}

// generateKubeVolumeDeviceFromLinuxDevice takes a list of devices and makes a VolumeDevice struct for kube
func generateKubeVolumeDeviceFromLinuxDevice(devices []specs.LinuxDevice) ([]v1.VolumeDevice, error) {
	var volumeDevices []v1.VolumeDevice
	for _, d := range devices {
		vd := v1.VolumeDevice{
			// TBD How are we going to sync up these names
			//Name:
			DevicePath: d.Path,
		}
		volumeDevices = append(volumeDevices, vd)
	}
	return volumeDevices, nil
}

func removeUnderscores(s string) string {
	return strings.Replace(s, "_", "", -1)
}