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kotsadm.go
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kotsadm.go
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package kotsadm
import (
"bytes"
"context"
"time"
"github.com/pkg/errors"
kotsv1beta1 "github.com/replicatedhq/kots/kotskinds/apis/kots/v1beta1"
"github.com/replicatedhq/kots/pkg/k8sutil"
"github.com/replicatedhq/kots/pkg/kotsadm/types"
corev1 "k8s.io/api/core/v1"
rbacv1 "k8s.io/api/rbac/v1"
kuberneteserrors "k8s.io/apimachinery/pkg/api/errors"
metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
"k8s.io/apimachinery/pkg/runtime/serializer/json"
"k8s.io/client-go/kubernetes"
"k8s.io/client-go/kubernetes/scheme"
)
func getKotsadmYAML(deployOptions types.DeployOptions) (map[string][]byte, error) {
docs := map[string][]byte{}
s := json.NewYAMLSerializer(json.DefaultMetaFactory, scheme.Scheme, scheme.Scheme)
var role bytes.Buffer
if err := s.Encode(kotsadmClusterRole(), &role); err != nil {
return nil, errors.Wrap(err, "failed to marshal kotsadm role")
}
docs["kotsadm-role.yaml"] = role.Bytes()
var roleBinding bytes.Buffer
if err := s.Encode(kotsadmClusterRoleBinding(deployOptions.Namespace), &roleBinding); err != nil {
return nil, errors.Wrap(err, "failed to marshal kotsadm role binding")
}
docs["kotsadm-rolebinding.yaml"] = roleBinding.Bytes()
var serviceAccount bytes.Buffer
if err := s.Encode(kotsadmServiceAccount(deployOptions.Namespace), &serviceAccount); err != nil {
return nil, errors.Wrap(err, "failed to marshal kotsadm service account")
}
docs["kotsadm-serviceaccount.yaml"] = serviceAccount.Bytes()
var deployment bytes.Buffer
if err := s.Encode(kotsadmDeployment(deployOptions), &deployment); err != nil {
return nil, errors.Wrap(err, "failed to marshal kotsadm deployment")
}
docs["kotsadm-deployment.yaml"] = deployment.Bytes()
var service bytes.Buffer
if err := s.Encode(kotsadmService(deployOptions.Namespace), &service); err != nil {
return nil, errors.Wrap(err, "failed to marshal kotsadm service")
}
docs["kotsadm-service.yaml"] = service.Bytes()
return docs, nil
}
func waitForKotsadm(deployOptions *types.DeployOptions, clientset *kubernetes.Clientset) error {
start := time.Now()
for {
pods, err := clientset.CoreV1().Pods(deployOptions.Namespace).List(context.TODO(), metav1.ListOptions{LabelSelector: "app=kotsadm"})
if err != nil {
return errors.Wrap(err, "failed to list pods")
}
for _, pod := range pods.Items {
if pod.Status.Phase == corev1.PodRunning {
if pod.Status.ContainerStatuses[0].Ready == true {
return nil
}
}
}
time.Sleep(time.Second)
if time.Now().Sub(start) > deployOptions.Timeout {
return &types.ErrorTimeout{Message: "timeout waiting for kotsadm pod"}
}
}
}
func ensureKotsadmComponent(deployOptions *types.DeployOptions, clientset *kubernetes.Clientset) error {
if err := ensureKotsadmRBAC(*deployOptions, clientset); err != nil {
return errors.Wrap(err, "failed to ensure kotsadm rbac")
}
if err := ensureApplicationMetadata(*deployOptions, clientset); err != nil {
return errors.Wrap(err, "failed to ensure custom branding")
}
if err := ensureKotsadmDeployment(*deployOptions, clientset); err != nil {
return errors.Wrap(err, "failed to ensure kotsadm deployment")
}
if err := ensureKotsadmService(deployOptions.Namespace, clientset); err != nil {
return errors.Wrap(err, "failed to ensure kotsadm service")
}
return nil
}
func ensureKotsadmRBAC(deployOptions types.DeployOptions, clientset *kubernetes.Clientset) error {
isClusterScoped, err := isKotsadmClusterScoped(deployOptions.ApplicationMetadata)
if err != nil {
return errors.Wrap(err, "failed to check if kotsadm is cluster scoped")
}
if isClusterScoped {
return ensureKotsadmClusterRBAC(deployOptions, clientset)
}
if err := ensureKotsadmRole(deployOptions.Namespace, clientset); err != nil {
return errors.Wrap(err, "failed to ensure kotsadm role")
}
if err := ensureKotsadmRoleBinding(deployOptions.Namespace, clientset); err != nil {
return errors.Wrap(err, "failed to ensure kotsadm role binding")
}
if err := ensureKotsadmServiceAccount(deployOptions.Namespace, clientset); err != nil {
return errors.Wrap(err, "failed to ensure kotsadm service account")
}
return nil
}
// ensureKotsadmClusterRBAC will ensure that the cluster role and cluster role bindings exists
func ensureKotsadmClusterRBAC(deployOptions types.DeployOptions, clientset *kubernetes.Clientset) error {
err := ensureKotsadmClusterRole(clientset)
if err != nil {
return errors.Wrap(err, "failed to ensure kotsadm cluster role")
}
if err := ensureKotsadmClusterRoleBinding(deployOptions.Namespace, clientset); err != nil {
return errors.Wrap(err, "failed to ensure kotsadm cluster role binding")
}
if err := ensureKotsadmServiceAccount(deployOptions.Namespace, clientset); err != nil {
return errors.Wrap(err, "failed to ensure kotsadm service account")
}
return nil
}
func ensureKotsadmClusterRole(clientset *kubernetes.Clientset) error {
_, err := clientset.RbacV1().ClusterRoles().Create(context.TODO(), kotsadmClusterRole(), metav1.CreateOptions{})
if err == nil || kuberneteserrors.IsAlreadyExists(err) {
return nil
}
return errors.Wrap(err, "failed to create cluster role")
}
func ensureKotsadmClusterRoleBinding(serviceAccountNamespace string, clientset *kubernetes.Clientset) error {
clusterRoleBinding, err := clientset.RbacV1().ClusterRoleBindings().Get(context.TODO(), "kotsadm-rolebinding", metav1.GetOptions{})
if kuberneteserrors.IsNotFound(err) {
_, err := clientset.RbacV1().ClusterRoleBindings().Create(context.TODO(), kotsadmClusterRoleBinding(serviceAccountNamespace), metav1.CreateOptions{})
if err != nil {
return errors.Wrap(err, "failed to create cluster rolebinding")
}
return nil
} else if err != nil {
return errors.Wrap(err, "failed to get cluster rolebinding")
}
for _, subject := range clusterRoleBinding.Subjects {
if subject.Namespace == serviceAccountNamespace && subject.Name == "kotsadm" && subject.Kind == "ServiceAccount" {
return nil
}
}
clusterRoleBinding.Subjects = append(clusterRoleBinding.Subjects, rbacv1.Subject{
Kind: "ServiceAccount",
Name: "kotsadm",
Namespace: serviceAccountNamespace,
})
_, err = clientset.RbacV1().ClusterRoleBindings().Update(context.TODO(), clusterRoleBinding, metav1.UpdateOptions{})
if err != nil {
return errors.Wrap(err, "failed to create cluster rolebinding")
}
return nil
}
func ensureKotsadmRole(namespace string, clientset *kubernetes.Clientset) error {
currentRole, err := clientset.RbacV1().Roles(namespace).Get(context.TODO(), "kotsadm-role", metav1.GetOptions{})
if err != nil {
if !kuberneteserrors.IsNotFound(err) {
return errors.Wrap(err, "failed to get role")
}
_, err := clientset.RbacV1().Roles(namespace).Create(context.TODO(), kotsadmRole(namespace), metav1.CreateOptions{})
if err != nil {
return errors.Wrap(err, "failed to create role")
}
return nil
}
// we have now changed the role, so an upgrade is required
k8sutil.UpdateRole(currentRole, kotsadmRole(namespace))
_, err = clientset.RbacV1().Roles(namespace).Update(context.TODO(), currentRole, metav1.UpdateOptions{})
if err != nil {
return errors.Wrap(err, "failed to update role")
}
return nil
}
func ensureKotsadmRoleBinding(namespace string, clientset *kubernetes.Clientset) error {
_, err := clientset.RbacV1().RoleBindings(namespace).Get(context.TODO(), "kotsadm-rolebinding", metav1.GetOptions{})
if err != nil {
if !kuberneteserrors.IsNotFound(err) {
return errors.Wrap(err, "failed to get rolebinding")
}
_, err := clientset.RbacV1().RoleBindings(namespace).Create(context.TODO(), kotsadmRoleBinding(namespace), metav1.CreateOptions{})
if err != nil {
return errors.Wrap(err, "failed to create rolebinding")
}
}
return nil
}
func ensureKotsadmServiceAccount(namespace string, clientset *kubernetes.Clientset) error {
_, err := clientset.CoreV1().ServiceAccounts(namespace).Get(context.TODO(), "kotsadm", metav1.GetOptions{})
if err != nil {
if !kuberneteserrors.IsNotFound(err) {
return errors.Wrap(err, "failed to get serviceaccouont")
}
_, err := clientset.CoreV1().ServiceAccounts(namespace).Create(context.TODO(), kotsadmServiceAccount(namespace), metav1.CreateOptions{})
if err != nil {
return errors.Wrap(err, "failed to create serviceaccount")
}
}
return nil
}
func ensureKotsadmDeployment(deployOptions types.DeployOptions, clientset *kubernetes.Clientset) error {
existingDeployment, err := clientset.AppsV1().Deployments(deployOptions.Namespace).Get(context.TODO(), "kotsadm", metav1.GetOptions{})
if err != nil {
if !kuberneteserrors.IsNotFound(err) {
return errors.Wrap(err, "failed to get existing deployment")
}
_, err := clientset.AppsV1().Deployments(deployOptions.Namespace).Create(context.TODO(), kotsadmDeployment(deployOptions), metav1.CreateOptions{})
if err != nil {
return errors.Wrap(err, "failed to create deployment")
}
return nil
}
if err = updateKotsadmDeployment(existingDeployment, deployOptions); err != nil {
return errors.Wrap(err, "failed to merge deployments")
}
_, err = clientset.AppsV1().Deployments(deployOptions.Namespace).Update(context.TODO(), existingDeployment, metav1.UpdateOptions{})
if err != nil {
return errors.Wrap(err, "failed to update kotsadm deployment")
}
return nil
}
func ensureKotsadmService(namespace string, clientset *kubernetes.Clientset) error {
_, err := clientset.CoreV1().Services(namespace).Get(context.TODO(), "kotsadm", metav1.GetOptions{})
if err != nil {
if !kuberneteserrors.IsNotFound(err) {
return errors.Wrap(err, "failed to get existing service")
}
_, err := clientset.CoreV1().Services(namespace).Create(context.TODO(), kotsadmService(namespace), metav1.CreateOptions{})
if err != nil {
return errors.Wrap(err, "Failed to create service")
}
}
return nil
}
// isKotsadmClusterScoped determines if the kotsadm pod should be running
// with cluster-wide permissions or not
func isKotsadmClusterScoped(applicationMetadata []byte) (bool, error) {
if applicationMetadata == nil {
return true, nil
}
decode := scheme.Codecs.UniversalDeserializer().Decode
obj, gvk, err := decode(applicationMetadata, nil, nil)
if err != nil {
return false, errors.Wrap(err, "failed to decode application metadata")
}
if gvk.Group != "kots.io" || gvk.Version != "v1beta1" || gvk.Kind != "Application" {
return false, errors.New("application metadata contained unepxected gvk")
}
application := obj.(*kotsv1beta1.Application)
// An application can request cluster scope privileges quite simply
if !application.Spec.RequireMinimalRBACPrivileges {
return true, nil
}
return false, nil
}