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main.go
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main.go
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// SPDX-FileCopyrightText: 2024 SAP SE or an SAP affiliate company and Gardener contributors
//
// SPDX-License-Identifier: Apache-2.0
package main
import (
"context"
"fmt"
"os"
"path"
"strings"
"github.com/go-logr/logr"
"github.com/spf13/cobra"
"github.com/spf13/pflag"
"k8s.io/apimachinery/pkg/util/sets"
"k8s.io/client-go/rest"
"k8s.io/klog/v2"
"sigs.k8s.io/controller-runtime/pkg/envtest"
logf "sigs.k8s.io/controller-runtime/pkg/log"
"sigs.k8s.io/controller-runtime/pkg/manager/signals"
"github.com/gardener/gardener/pkg/logger"
gardenerenvtest "github.com/gardener/gardener/test/envtest"
)
const name = "start-envtest"
func main() {
opts := &options{}
cmd := &cobra.Command{
Use: name,
Short: "Launch an envtest environment",
Args: cobra.NoArgs,
RunE: func(cmd *cobra.Command, _ []string) error {
if err := opts.validate(); err != nil {
return err
}
log, err := logger.NewZapLogger(logger.DebugLevel, logger.FormatText)
if err != nil {
return fmt.Errorf("error instantiating zap logger: %w", err)
}
logf.SetLogger(log)
klog.SetLogger(log)
log = logf.Log.WithName(name)
// don't output usage on further errors raised during execution
cmd.SilenceUsage = true
// further errors will be logged properly, don't duplicate
cmd.SilenceErrors = true
return run(cmd.Context(), log, opts)
},
}
opts.addFlags(cmd.Flags())
if err := cmd.ExecuteContext(signals.SetupSignalHandler()); err != nil {
fmt.Println(err)
os.Exit(1)
}
}
const (
typeKubernetes = "kubernetes"
typeGardener = "gardener"
)
var supportedTypes = sets.New(typeKubernetes, typeGardener)
type options struct {
environmentType string
kubeconfig string
}
func (o *options) addFlags(fs *pflag.FlagSet) {
fs.StringVar(&o.environmentType, "environment-type", typeKubernetes, fmt.Sprintf("Type of environment to start. Supported values: %s", strings.Join(sets.List(supportedTypes), ", ")))
fs.StringVar(&o.kubeconfig, "kubeconfig", path.Join("..", "..", "dev", "envtest-kubeconfig.yaml"), "File to place the environment's admin kubeconfig in.")
}
func (o *options) validate() error {
if !supportedTypes.Has(o.environmentType) {
return fmt.Errorf("unsupported environment type %q, supported types are: %s", o.environmentType, strings.Join(sets.List(supportedTypes), ", "))
}
return nil
}
type testEnvironment interface {
Start() (*rest.Config, error)
Stop() error
}
func run(ctx context.Context, log logr.Logger, opts *options) error {
log.Info("Starting test environment", "type", opts.environmentType)
kubeEnvironment := &envtest.Environment{}
var testEnv testEnvironment = kubeEnvironment
if opts.environmentType == typeGardener {
testEnv = &gardenerenvtest.GardenerTestEnvironment{
Environment: kubeEnvironment,
GardenerAPIServer: &gardenerenvtest.GardenerAPIServer{
Args: []string{"--disable-admission-plugins="},
},
}
}
_, err := testEnv.Start()
if err != nil {
return fmt.Errorf("error starting test environment: %w", err)
}
defer func() {
log.Info("Stopping test environment")
if err := testEnv.Stop(); err != nil {
log.Error(err, "Error stopping test environment")
}
}()
adminUser, err := kubeEnvironment.ControlPlane.AddUser(envtest.User{
Name: "envtest-admin",
Groups: []string{"system:masters"},
}, nil)
if err != nil {
return fmt.Errorf("error adding admin user: %w", err)
}
kubeConfigBytes, err := adminUser.KubeConfig()
if err != nil {
return fmt.Errorf("error getting admin user kubeconfig: %w", err)
}
if err := os.WriteFile(opts.kubeconfig, kubeConfigBytes, 0600); err != nil {
return fmt.Errorf("error writing kubeconfig file: %w", err)
}
log.Info("Successfully written kubeconfig", "file", opts.kubeconfig)
defer func() {
log.Info("Cleaning up kubeconfig file", "file", opts.kubeconfig)
if err := os.Remove(opts.kubeconfig); err != nil {
log.Error(err, "Error cleaning up kubeconfig file", "file", opts.kubeconfig)
}
}()
log.Info("Test environment ready!")
// block until cancelled
<-ctx.Done()
log.Info("Stop procedure initiated")
return nil
}