woodpecker/pipeline/backend/kubernetes/pod.go

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// Copyright 2022 Woodpecker Authors
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package kubernetes
import (
"context"
"fmt"
"maps"
"strings"
"github.com/rs/zerolog/log"
v1 "k8s.io/api/core/v1"
"k8s.io/apimachinery/pkg/api/errors"
"k8s.io/apimachinery/pkg/api/resource"
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meta_v1 "k8s.io/apimachinery/pkg/apis/meta/v1"
"go.woodpecker-ci.org/woodpecker/v2/pipeline/backend/common"
"go.woodpecker-ci.org/woodpecker/v2/pipeline/backend/types"
)
const (
StepLabel = "step"
podPrefix = "wp-"
)
func mkPod(step *types.Step, config *config, podName, goos string, options BackendOptions) (*v1.Pod, error) {
var err error
nsp := newNativeSecretsProcessor(config, options.Secrets)
err = nsp.process()
if err != nil {
return nil, err
}
meta, err := podMeta(step, config, options, podName)
if err != nil {
return nil, err
}
spec, err := podSpec(step, config, options, nsp)
if err != nil {
return nil, err
}
container, err := podContainer(step, podName, goos, options, nsp)
if err != nil {
return nil, err
}
spec.Containers = append(spec.Containers, container)
pod := &v1.Pod{
ObjectMeta: meta,
Spec: spec,
}
return pod, nil
}
func stepToPodName(step *types.Step) (name string, err error) {
if step.Type == types.StepTypeService {
return serviceName(step)
}
return podName(step)
}
func podName(step *types.Step) (string, error) {
return dnsName(podPrefix + step.UUID)
}
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func podMeta(step *types.Step, config *config, options BackendOptions, podName string) (meta_v1.ObjectMeta, error) {
var err error
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meta := meta_v1.ObjectMeta{
Name: podName,
Namespace: config.Namespace,
Annotations: podAnnotations(config, options),
}
meta.Labels, err = podLabels(step, config, options)
if err != nil {
return meta, err
}
return meta, nil
}
func podLabels(step *types.Step, config *config, options BackendOptions) (map[string]string, error) {
var err error
labels := make(map[string]string)
if len(options.Labels) > 0 {
if config.PodLabelsAllowFromStep {
log.Trace().Msgf("using labels from the backend options: %v", options.Labels)
maps.Copy(labels, options.Labels)
} else {
log.Debug().Msg("Pod labels were defined in backend options, but its using disallowed by instance configuration")
}
}
if len(config.PodLabels) > 0 {
log.Trace().Msgf("using labels from the configuration: %v", config.PodLabels)
maps.Copy(labels, config.PodLabels)
}
if step.Type == types.StepTypeService {
labels[ServiceLabel], _ = serviceName(step)
}
labels[StepLabel], err = stepLabel(step)
if err != nil {
return labels, err
}
return labels, nil
}
func stepLabel(step *types.Step) (string, error) {
return toDNSName(step.Name)
}
func podAnnotations(config *config, options BackendOptions) map[string]string {
annotations := make(map[string]string)
if len(options.Annotations) > 0 {
if config.PodAnnotationsAllowFromStep {
log.Trace().Msgf("using annotations from the backend options: %v", options.Annotations)
maps.Copy(annotations, options.Annotations)
} else {
log.Debug().Msg("Pod annotations were defined in backend options, but its using disallowed by instance configuration ")
}
}
if len(config.PodAnnotations) > 0 {
log.Trace().Msgf("using annotations from the configuration: %v", config.PodAnnotations)
maps.Copy(annotations, config.PodAnnotations)
}
return annotations
}
func podSpec(step *types.Step, config *config, options BackendOptions, nsp nativeSecretsProcessor) (v1.PodSpec, error) {
var err error
spec := v1.PodSpec{
RestartPolicy: v1.RestartPolicyNever,
RuntimeClassName: options.RuntimeClassName,
ServiceAccountName: options.ServiceAccountName,
HostAliases: hostAliases(step.ExtraHosts),
NodeSelector: nodeSelector(options.NodeSelector, config.PodNodeSelector, step.Environment["CI_SYSTEM_PLATFORM"]),
Tolerations: tolerations(options.Tolerations),
SecurityContext: podSecurityContext(options.SecurityContext, config.SecurityContext, step.Privileged),
}
spec.Volumes, err = pvcVolumes(step.Volumes)
if err != nil {
return spec, err
}
log.Trace().Msgf("using the image pull secrets: %v", config.ImagePullSecretNames)
spec.ImagePullSecrets = secretsReferences(config.ImagePullSecretNames)
spec.Volumes = append(spec.Volumes, nsp.volumes...)
return spec, nil
}
func podContainer(step *types.Step, podName, goos string, options BackendOptions, nsp nativeSecretsProcessor) (v1.Container, error) {
var err error
container := v1.Container{
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Name: podName,
Image: step.Image,
WorkingDir: step.WorkingDir,
Ports: containerPorts(step.Ports),
SecurityContext: containerSecurityContext(options.SecurityContext, step.Privileged),
}
if step.Pull {
container.ImagePullPolicy = v1.PullAlways
}
if len(step.Commands) > 0 {
scriptEnv, command := common.GenerateContainerConf(step.Commands, goos)
container.Command = command
maps.Copy(step.Environment, scriptEnv)
}
if len(step.Entrypoint) > 0 {
container.Command = step.Entrypoint
}
container.Env = mapToEnvVars(step.Environment)
container.Resources, err = resourceRequirements(options.Resources)
if err != nil {
return container, err
}
container.VolumeMounts, err = volumeMounts(step.Volumes)
if err != nil {
return container, err
}
container.EnvFrom = append(container.EnvFrom, nsp.envFromSources...)
container.Env = append(container.Env, nsp.envVars...)
container.VolumeMounts = append(container.VolumeMounts, nsp.mounts...)
return container, nil
}
func pvcVolumes(volumes []string) ([]v1.Volume, error) {
var vols []v1.Volume
for _, v := range volumes {
volumeName, err := volumeName(v)
if err != nil {
return nil, err
}
vols = append(vols, pvcVolume(volumeName))
}
return vols, nil
}
func pvcVolume(name string) v1.Volume {
pvcSource := v1.PersistentVolumeClaimVolumeSource{
ClaimName: name,
ReadOnly: false,
}
return v1.Volume{
Name: name,
VolumeSource: v1.VolumeSource{
PersistentVolumeClaim: &pvcSource,
},
}
}
func volumeMounts(volumes []string) ([]v1.VolumeMount, error) {
var mounts []v1.VolumeMount
for _, v := range volumes {
volumeName, err := volumeName(v)
if err != nil {
return nil, err
}
mount := volumeMount(volumeName, volumeMountPath(v))
mounts = append(mounts, mount)
}
return mounts, nil
}
func volumeMount(name, path string) v1.VolumeMount {
return v1.VolumeMount{
Name: name,
MountPath: path,
}
}
func containerPorts(ports []types.Port) []v1.ContainerPort {
containerPorts := make([]v1.ContainerPort, len(ports))
for i, port := range ports {
containerPorts[i] = containerPort(port)
}
return containerPorts
}
func containerPort(port types.Port) v1.ContainerPort {
return v1.ContainerPort{
ContainerPort: int32(port.Number),
Protocol: v1.Protocol(strings.ToUpper(port.Protocol)),
}
}
// Here is the service IPs (placed in /etc/hosts in the Pod).
func hostAliases(extraHosts []types.HostAlias) []v1.HostAlias {
var hostAliases []v1.HostAlias
for _, extraHost := range extraHosts {
hostAlias := hostAlias(extraHost)
hostAliases = append(hostAliases, hostAlias)
}
return hostAliases
}
func hostAlias(extraHost types.HostAlias) v1.HostAlias {
return v1.HostAlias{
IP: extraHost.IP,
Hostnames: []string{extraHost.Name},
}
}
func resourceRequirements(resources Resources) (v1.ResourceRequirements, error) {
var err error
requirements := v1.ResourceRequirements{}
requirements.Requests, err = resourceList(resources.Requests)
if err != nil {
return requirements, err
}
requirements.Limits, err = resourceList(resources.Limits)
if err != nil {
return requirements, err
}
return requirements, nil
}
func resourceList(resources map[string]string) (v1.ResourceList, error) {
requestResources := v1.ResourceList{}
for key, val := range resources {
resName := v1.ResourceName(key)
resVal, err := resource.ParseQuantity(val)
if err != nil {
return nil, fmt.Errorf("resource request '%s' quantity '%s': %w", key, val, err)
}
requestResources[resName] = resVal
}
return requestResources, nil
}
func nodeSelector(backendNodeSelector, configNodeSelector map[string]string, platform string) map[string]string {
nodeSelector := make(map[string]string)
if platform != "" {
arch := strings.Split(platform, "/")[1]
nodeSelector[v1.LabelArchStable] = arch
log.Trace().Msgf("using the node selector from the Agent's platform: %v", nodeSelector)
}
if len(configNodeSelector) > 0 {
log.Trace().Msgf("appending labels to the node selector from the configuration: %v", configNodeSelector)
maps.Copy(nodeSelector, configNodeSelector)
}
if len(backendNodeSelector) > 0 {
log.Trace().Msgf("appending labels to the node selector from the backend options: %v", backendNodeSelector)
maps.Copy(nodeSelector, backendNodeSelector)
}
return nodeSelector
}
func tolerations(backendTolerations []Toleration) []v1.Toleration {
var tolerations []v1.Toleration
if len(backendTolerations) > 0 {
log.Trace().Msgf("tolerations that will be used in the backend options: %v", backendTolerations)
for _, backendToleration := range backendTolerations {
toleration := toleration(backendToleration)
tolerations = append(tolerations, toleration)
}
}
return tolerations
}
func toleration(backendToleration Toleration) v1.Toleration {
return v1.Toleration{
Key: backendToleration.Key,
Operator: v1.TolerationOperator(backendToleration.Operator),
Value: backendToleration.Value,
Effect: v1.TaintEffect(backendToleration.Effect),
TolerationSeconds: backendToleration.TolerationSeconds,
}
}
func podSecurityContext(sc *SecurityContext, secCtxConf SecurityContextConfig, stepPrivileged bool) *v1.PodSecurityContext {
var (
nonRoot *bool
user *int64
group *int64
fsGroup *int64
seccomp *v1.SeccompProfile
apparmor *v1.AppArmorProfile
)
if secCtxConf.RunAsNonRoot {
nonRoot = newBool(true)
}
if sc != nil {
// only allow to set user if its not root or step is privileged
if sc.RunAsUser != nil && (*sc.RunAsUser != 0 || stepPrivileged) {
user = sc.RunAsUser
}
// only allow to set group if its not root or step is privileged
if sc.RunAsGroup != nil && (*sc.RunAsGroup != 0 || stepPrivileged) {
group = sc.RunAsGroup
}
// only allow to set fsGroup if its not root or step is privileged
if sc.FSGroup != nil && (*sc.FSGroup != 0 || stepPrivileged) {
fsGroup = sc.FSGroup
}
// only allow to set nonRoot if it's not set globally already
if nonRoot == nil && sc.RunAsNonRoot != nil {
nonRoot = sc.RunAsNonRoot
}
seccomp = seccompProfile(sc.SeccompProfile)
apparmor = apparmorProfile(sc.ApparmorProfile)
}
if nonRoot == nil && user == nil && group == nil && fsGroup == nil && seccomp == nil {
return nil
}
securityContext := &v1.PodSecurityContext{
RunAsNonRoot: nonRoot,
RunAsUser: user,
RunAsGroup: group,
FSGroup: fsGroup,
SeccompProfile: seccomp,
AppArmorProfile: apparmor,
}
log.Trace().Msgf("pod security context that will be used: %v", securityContext)
return securityContext
}
func seccompProfile(scp *SecProfile) *v1.SeccompProfile {
if scp == nil || len(scp.Type) == 0 {
return nil
}
log.Trace().Msgf("using seccomp profile: %v", scp)
seccompProfile := &v1.SeccompProfile{
Type: v1.SeccompProfileType(scp.Type),
}
if len(scp.LocalhostProfile) > 0 {
seccompProfile.LocalhostProfile = &scp.LocalhostProfile
}
return seccompProfile
}
func apparmorProfile(scp *SecProfile) *v1.AppArmorProfile {
if scp == nil || len(scp.Type) == 0 {
return nil
}
log.Trace().Msgf("using AppArmor profile: %v", scp)
apparmorProfile := &v1.AppArmorProfile{
Type: v1.AppArmorProfileType(scp.Type),
}
if len(scp.LocalhostProfile) > 0 {
apparmorProfile.LocalhostProfile = &scp.LocalhostProfile
}
return apparmorProfile
}
func containerSecurityContext(sc *SecurityContext, stepPrivileged bool) *v1.SecurityContext {
if !stepPrivileged {
return nil
}
privileged := false
// if security context privileged is set explicitly
if sc != nil && sc.Privileged != nil && *sc.Privileged {
privileged = true
}
// if security context privileged is not set explicitly, but step is privileged
if (sc == nil || sc.Privileged == nil) && stepPrivileged {
privileged = true
}
if privileged {
securityContext := &v1.SecurityContext{
Privileged: newBool(true),
}
log.Trace().Msgf("container security context that will be used: %v", securityContext)
return securityContext
}
return nil
}
func mapToEnvVars(m map[string]string) []v1.EnvVar {
var ev []v1.EnvVar
for k, v := range m {
ev = append(ev, v1.EnvVar{
Name: k,
Value: v,
})
}
return ev
}
func startPod(ctx context.Context, engine *kube, step *types.Step, options BackendOptions) (*v1.Pod, error) {
podName, err := stepToPodName(step)
if err != nil {
return nil, err
}
engineConfig := engine.getConfig()
pod, err := mkPod(step, engineConfig, podName, engine.goos, options)
if err != nil {
return nil, err
}
log.Trace().Msgf("creating pod: %s", pod.Name)
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return engine.client.CoreV1().Pods(engineConfig.Namespace).Create(ctx, pod, meta_v1.CreateOptions{})
}
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func stopPod(ctx context.Context, engine *kube, step *types.Step, deleteOpts meta_v1.DeleteOptions) error {
podName, err := stepToPodName(step)
if err != nil {
return err
}
log.Trace().Str("name", podName).Msg("deleting pod")
err = engine.client.CoreV1().Pods(engine.config.Namespace).Delete(ctx, podName, deleteOpts)
if errors.IsNotFound(err) {
// Don't abort on 404 errors from k8s, they most likely mean that the pod hasn't been created yet, usually because pipeline was canceled before running all steps.
return nil
}
return err
}