/
executor_kubernetes.go
367 lines (299 loc) · 10.1 KB
/
executor_kubernetes.go
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package kubernetes
import (
"fmt"
"regexp"
"strings"
"golang.org/x/net/context"
"k8s.io/kubernetes/pkg/api"
client "k8s.io/kubernetes/pkg/client/unversioned"
"gitlab.com/gitlab-org/gitlab-ci-multi-runner/common"
"gitlab.com/gitlab-org/gitlab-ci-multi-runner/executors"
)
var (
executorOptions = executors.ExecutorOptions{
SharedBuildsDir: false,
Shell: common.ShellScriptInfo{
Shell: "bash",
Type: common.NormalShell,
RunnerCommand: "/usr/bin/gitlab-runner-helper",
},
ShowHostname: true,
SupportedOptions: []string{"image", "services", "artifacts", "cache"},
}
)
type kubernetesOptions struct {
Image string `json:"image"`
Services []string `json:"services"`
}
type executor struct {
executors.AbstractExecutor
kubeClient *client.Client
pod *api.Pod
options *kubernetesOptions
namespaceOverwrite string
buildLimits api.ResourceList
serviceLimits api.ResourceList
helperLimits api.ResourceList
buildRequests api.ResourceList
serviceRequests api.ResourceList
helperRequests api.ResourceList
pullPolicy common.KubernetesPullPolicy
}
func (s *executor) setupResources() error {
var err error
// Limit
CPULimit := getNewOrLegacy(s.Config.Kubernetes.CPULimit, s.Config.Kubernetes.CPUs)
MemoryLimit := getNewOrLegacy(s.Config.Kubernetes.MemoryLimit, s.Config.Kubernetes.Memory)
if s.buildLimits, err = limits(CPULimit, MemoryLimit); err != nil {
return fmt.Errorf("invalid build limits specified: %s", err.Error())
}
CPULimit = getNewOrLegacy(s.Config.Kubernetes.ServiceCPULimit, s.Config.Kubernetes.ServiceCPUs)
MemoryLimit = getNewOrLegacy(s.Config.Kubernetes.ServiceMemoryLimit, s.Config.Kubernetes.ServiceMemory)
if s.serviceLimits, err = limits(CPULimit, MemoryLimit); err != nil {
return fmt.Errorf("invalid service limits specified: %s", err.Error())
}
CPULimit = getNewOrLegacy(s.Config.Kubernetes.HelperCPULimit, s.Config.Kubernetes.HelperCPUs)
MemoryLimit = getNewOrLegacy(s.Config.Kubernetes.HelperMemoryLimit, s.Config.Kubernetes.HelperMemory)
if s.helperLimits, err = limits(CPULimit, MemoryLimit); err != nil {
return fmt.Errorf("invalid helper limits specified: %s", err.Error())
}
// Requests
if s.buildRequests, err = limits(s.Config.Kubernetes.CPURequest, s.Config.Kubernetes.MemoryRequest); err != nil {
return fmt.Errorf("invalid build requests specified: %s", err.Error())
}
if s.serviceRequests, err = limits(s.Config.Kubernetes.ServiceCPURequest, s.Config.Kubernetes.ServiceMemoryRequest); err != nil {
return fmt.Errorf("invalid service requests specified: %s", err.Error())
}
if s.helperRequests, err = limits(s.Config.Kubernetes.HelperCPURequest, s.Config.Kubernetes.HelperMemoryRequest); err != nil {
return fmt.Errorf("invalid helper requests specified: %s", err.Error())
}
return nil
}
func (s *executor) Prepare(globalConfig *common.Config, config *common.RunnerConfig, build *common.Build) (err error) {
if err = s.AbstractExecutor.Prepare(globalConfig, config, build); err != nil {
return err
}
if s.BuildShell.PassFile {
return fmt.Errorf("kubernetes doesn't support shells that require script file")
}
if err = build.Options.Decode(&s.options); err != nil {
return err
}
if s.kubeClient, err = getKubeClient(config.Kubernetes); err != nil {
return fmt.Errorf("error connecting to Kubernetes: %s", err.Error())
}
if err = s.setupResources(); err != nil {
return err
}
if s.pullPolicy, err = s.Config.Kubernetes.PullPolicy.Get(); err != nil {
return err
}
if err = s.overwriteNamespace(build); err != nil {
return err
}
if err = s.checkDefaults(); err != nil {
return err
}
s.Println("Using Kubernetes executor with image", s.options.Image, "...")
return nil
}
func (s *executor) Run(cmd common.ExecutorCommand) error {
s.Debugln("Starting Kubernetes command...")
if s.pod == nil {
err := s.setupBuildPod()
if err != nil {
return err
}
}
containerName := "build"
if cmd.Predefined {
containerName = "helper"
}
ctx, cancel := context.WithCancel(context.Background())
select {
case err := <-s.runInContainer(ctx, containerName, cmd.Script):
if err != nil && strings.Contains(err.Error(), "executing in Docker Container") {
return &common.BuildError{Inner: err}
}
return err
case <-cmd.Abort:
cancel()
return fmt.Errorf("build aborted")
}
}
func (s *executor) Cleanup() {
if s.pod != nil {
err := s.kubeClient.Pods(s.pod.Namespace).Delete(s.pod.Name, nil)
if err != nil {
s.Errorln(fmt.Sprintf("Error cleaning up pod: %s", err.Error()))
}
}
closeKubeClient(s.kubeClient)
s.AbstractExecutor.Cleanup()
}
func (s *executor) buildContainer(name, image string, requests, limits api.ResourceList, command ...string) api.Container {
path := strings.Split(s.Build.BuildDir, "/")
path = path[:len(path)-1]
privileged := false
if s.Config.Kubernetes != nil {
privileged = s.Config.Kubernetes.Privileged
}
return api.Container{
Name: name,
Image: image,
ImagePullPolicy: api.PullPolicy(s.pullPolicy),
Command: command,
Env: buildVariables(s.Build.GetAllVariables().PublicOrInternal()),
Resources: api.ResourceRequirements{
Limits: limits,
Requests: requests,
},
VolumeMounts: []api.VolumeMount{
api.VolumeMount{
Name: "repo",
MountPath: strings.Join(path, "/"),
},
},
SecurityContext: &api.SecurityContext{
Privileged: &privileged,
},
Stdin: true,
}
}
func (s *executor) setupBuildPod() error {
services := make([]api.Container, len(s.options.Services))
for i, image := range s.options.Services {
resolvedImage := s.Build.GetAllVariables().ExpandValue(image)
services[i] = s.buildContainer(fmt.Sprintf("svc-%d", i), resolvedImage, s.serviceRequests, s.serviceLimits)
}
var imagePullSecrets []api.LocalObjectReference
for _, imagePullSecret := range s.Config.Kubernetes.ImagePullSecrets {
imagePullSecrets = append(imagePullSecrets, api.LocalObjectReference{Name: imagePullSecret})
}
buildImage := s.Build.GetAllVariables().ExpandValue(s.options.Image)
pod, err := s.kubeClient.Pods(s.Config.Kubernetes.Namespace).Create(&api.Pod{
ObjectMeta: api.ObjectMeta{
GenerateName: s.Build.ProjectUniqueName(),
Namespace: s.Config.Kubernetes.Namespace,
},
Spec: api.PodSpec{
Volumes: []api.Volume{
api.Volume{
Name: "repo",
VolumeSource: api.VolumeSource{
EmptyDir: &api.EmptyDirVolumeSource{},
},
},
},
RestartPolicy: api.RestartPolicyNever,
NodeSelector: s.Config.Kubernetes.NodeSelector,
Containers: append([]api.Container{
s.buildContainer("build", buildImage, s.buildRequests, s.buildLimits, s.BuildShell.DockerCommand...),
s.buildContainer("helper", s.Config.Kubernetes.GetHelperImage(), s.helperRequests, s.helperLimits, s.BuildShell.DockerCommand...),
}, services...),
TerminationGracePeriodSeconds: &s.Config.Kubernetes.TerminationGracePeriodSeconds,
ImagePullSecrets: imagePullSecrets,
},
})
if err != nil {
return err
}
s.pod = pod
return nil
}
func (s *executor) runInContainer(ctx context.Context, name, command string) <-chan error {
errc := make(chan error, 1)
go func() {
defer close(errc)
status, err := waitForPodRunning(ctx, s.kubeClient, s.pod, s.BuildTrace, s.Config.Kubernetes)
if err != nil {
errc <- err
return
}
if status != api.PodRunning {
errc <- fmt.Errorf("pod failed to enter running state: %s", status)
return
}
config, err := getKubeClientConfig(s.Config.Kubernetes)
if err != nil {
errc <- err
return
}
exec := ExecOptions{
PodName: s.pod.Name,
Namespace: s.pod.Namespace,
ContainerName: name,
Command: s.BuildShell.DockerCommand,
In: strings.NewReader(command),
Out: s.BuildTrace,
Err: s.BuildTrace,
Stdin: true,
Config: config,
Client: s.kubeClient,
Executor: &DefaultRemoteExecutor{},
}
errc <- exec.Run()
}()
return errc
}
// checkDefaults Defines the configuration for the Pod on Kubernetes
func (s *executor) checkDefaults() error {
if s.options.Image == "" {
if s.Config.Kubernetes.Image == "" {
return fmt.Errorf("no image specified and no default set in config")
}
s.options.Image = s.Config.Kubernetes.Image
}
if s.Config.Kubernetes.Namespace == "" {
s.Warningln("Namespace is empty, therefore assuming 'default'.")
s.Config.Kubernetes.Namespace = "default"
}
s.Println("Using Kubernetes namespace:", s.Config.Kubernetes.Namespace)
return nil
}
// overwriteNamespace checks for variable in order to overwrite the configured
// namespace, as long as it complies to validation regular-expression, when
// expression is empty the overwrite is disabled.
func (s *executor) overwriteNamespace(build *common.Build) error {
if s.Config.Kubernetes.NamespaceOverwriteAllowed == "" {
s.Debugln("Configuration entry 'namespace_overwrite_allowed' is empty, using configured namespace.")
return nil
}
// looking for namespace overwrite variable, and expanding for interpolation
s.namespaceOverwrite = build.Variables.Expand().Get("KUBERNETES_NAMESPACE_OVERWRITE")
if s.namespaceOverwrite == "" {
return nil
}
var err error
var r *regexp.Regexp
if r, err = regexp.Compile(s.Config.Kubernetes.NamespaceOverwriteAllowed); err != nil {
return err
}
if match := r.MatchString(s.namespaceOverwrite); !match {
return fmt.Errorf("KUBERNETES_NAMESPACE_OVERWRITE='%s' does not match 'namespace_overwrite_allowed': '%s'",
s.namespaceOverwrite, s.Config.Kubernetes.NamespaceOverwriteAllowed)
}
s.Println("Overwritting configured namespace, from", s.Config.Kubernetes.Namespace, "to", s.namespaceOverwrite)
s.Config.Kubernetes.Namespace = s.namespaceOverwrite
return nil
}
func createFn() common.Executor {
return &executor{
AbstractExecutor: executors.AbstractExecutor{
ExecutorOptions: executorOptions,
},
}
}
func featuresFn(features *common.FeaturesInfo) {
features.Variables = true
features.Image = true
features.Services = true
features.Artifacts = true
features.Cache = true
}
func init() {
common.RegisterExecutor("kubernetes", executors.DefaultExecutorProvider{
Creator: createFn,
FeaturesUpdater: featuresFn,
})
}