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kind.go
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kind.go
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// Copyright 2022 D2iQ, Inc. All rights reserved.
// SPDX-License-Identifier: Apache-2.0
package cluster
import (
"context"
"fmt"
"os"
"os/exec"
"path/filepath"
"strings"
"time"
"github.com/docker/docker/pkg/namesgenerator"
"go.uber.org/multierr"
yaml "gopkg.in/yaml.v3"
"k8s.io/apimachinery/pkg/api/errors"
metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
"k8s.io/apimachinery/pkg/util/wait"
"k8s.io/client-go/kubernetes"
"k8s.io/client-go/tools/clientcmd"
kindv1alpha4 "sigs.k8s.io/kind/pkg/apis/config/v1alpha4"
"github.com/d2iq-labs/csi-driver-trusted-ca/test/e2e/seedrng"
)
// kindCluster represents a KinD cluster.
type kindCluster struct {
name string
}
// NewKinDCluster creates a KinD cluster and returns a Cluster ready to be used.
func NewKinDCluster(
ctx context.Context,
cfg *kindv1alpha4.Cluster,
) (kc Cluster, name, kubeconfig string, err error) {
seedrng.EnsureSeeded()
if cfg.Name == "" {
cfg.Name = strings.ReplaceAll(namesgenerator.GetRandomName(0), "_", "-")
}
// Do not export kubeconfig to file by default, makes cleanup easier.
tempDir, err := os.MkdirTemp("", fmt.Sprintf("%s-kindcluster-*", cfg.Name))
if err != nil {
return nil, "", "", fmt.Errorf(
"failed to create temporary directory for KinD cluster configuration: %w",
err,
)
}
defer os.RemoveAll(tempDir)
defaultKinDClusterConfig(cfg)
cfgFile := filepath.Join(tempDir, "cluster.yaml")
cfgBytes, err := yaml.Marshal(cfg)
if err != nil {
return nil, "", "", fmt.Errorf(
"failed to marshal KinD cluster configuration to YAML: %w",
err,
)
}
if err := os.WriteFile(cfgFile, cfgBytes, 0o400); err != nil { //nolint:revive // 0400 is standard read-only perms.
return nil, "", "", fmt.Errorf(
"failed to write KinD cluster configuration to file: %w",
err,
)
}
tempKubeconfig := filepath.Join(tempDir, "kubeconfig")
cmd := exec.CommandContext( //nolint:gosec // Only used in tests so safe.
ctx,
"kind", "create", "cluster",
"--name", cfg.Name,
"--kubeconfig", tempKubeconfig,
"--config", cfgFile,
"--retain",
)
err = cmd.Run()
if err != nil {
return nil, "", "", fmt.Errorf("failed to create KinD cluster: %w", err)
}
kubeconfigBytes, err := os.ReadFile(tempKubeconfig)
if err != nil {
return nil, "", "", fmt.Errorf("failed to get KinD cluster kubeconfig: %w", err)
}
kubeconfig = string(kubeconfigBytes)
kc = &kindCluster{
name: cfg.Name,
}
if err := waitForDefaultServiceAccountToExist(ctx, kubeconfig); err != nil {
if deleteErr := kc.Delete( //nolint:contextcheck // Best effort background deletion.
context.Background(),
); deleteErr != nil {
err = multierr.Combine(err, deleteErr)
}
return nil, "", "", err
}
return kc, cfg.Name, kubeconfig, nil
}
func (c *kindCluster) Delete(ctx context.Context) error {
tempKubeconfig, err := os.CreateTemp("", fmt.Sprintf("%s-kindcluster-kubeconfig-*", c.name))
if err != nil {
return fmt.Errorf("failed to create temporary file for KinD cluster kubeconfig: %w", err)
}
if err := tempKubeconfig.Close(); err != nil {
return fmt.Errorf("failed to create temporary file for KinD cluster kubeconfig: %w", err)
}
defer os.Remove(tempKubeconfig.Name())
cmd := exec.CommandContext( //nolint:gosec // Only used in tests so safe.
ctx,
"kind",
"delete", "cluster",
"--name", c.name,
"--kubeconfig", tempKubeconfig.Name(),
)
if err := cmd.Run(); err != nil {
return fmt.Errorf("failed to delete KinD cluster: %w", err)
}
return nil
}
func waitForDefaultServiceAccountToExist(ctx context.Context, kubeconfig string) error {
restConfig, err := clientcmd.RESTConfigFromKubeConfig([]byte(kubeconfig))
if err != nil {
return fmt.Errorf("failed to create REST config from kubeconfig: %w", err)
}
kubeClient, err := kubernetes.NewForConfig(restConfig)
if err != nil {
return fmt.Errorf("failed to create Kubernetes client from kubeconfig: %w", err)
}
return wait.PollInfiniteWithContext(
ctx,
time.Second*1,
func(ctx context.Context) (bool, error) {
_, getSAErr := kubeClient.CoreV1().ServiceAccounts(metav1.NamespaceDefault).
Get(ctx, "default", metav1.GetOptions{})
if getSAErr == nil {
return true, nil
}
if errors.IsNotFound(getSAErr) {
return false, nil
}
return false, getSAErr
},
)
}
func defaultKinDClusterConfig(cfg *kindv1alpha4.Cluster) {
kindv1alpha4.SetDefaultsCluster(cfg)
if cfg.APIVersion == "" {
cfg.APIVersion = "kind.x-k8s.io/v1alpha4"
}
if cfg.Kind == "" {
cfg.Kind = "Cluster"
}
}