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main.go
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main.go
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package main
import (
"bufio"
"context"
"crypto/rand"
"crypto/rsa"
"crypto/x509"
"encoding/pem"
"errors"
"fmt"
"io"
"os"
"os/signal"
"path/filepath"
"sort"
"strings"
"syscall"
"time"
"github.com/docker/docker/api/types"
"github.com/docker/docker/api/types/container"
"github.com/docker/docker/api/types/mount"
"github.com/docker/docker/api/types/strslice"
dockerclient "github.com/docker/docker/client"
"github.com/fatih/color"
"github.com/go-logr/logr"
"github.com/go-logr/zapr"
"github.com/jedib0t/go-pretty/v6/table"
"github.com/sethvargo/go-envconfig"
flag "github.com/spf13/pflag"
"go.uber.org/zap"
"golang.org/x/sync/errgroup"
corev1 "k8s.io/api/core/v1"
apiextv1 "k8s.io/apiextensions-apiserver/pkg/apis/apiextensions/v1"
kerrors "k8s.io/apimachinery/pkg/api/errors"
v1 "k8s.io/apimachinery/pkg/apis/meta/v1"
"k8s.io/apimachinery/pkg/apis/meta/v1/unstructured"
kruntime "k8s.io/apimachinery/pkg/runtime"
"k8s.io/apimachinery/pkg/runtime/schema"
"k8s.io/apimachinery/pkg/runtime/serializer"
"k8s.io/apimachinery/pkg/util/wait"
utilyaml "k8s.io/apimachinery/pkg/util/yaml"
"k8s.io/client-go/rest"
"k8s.io/utils/strings/slices"
"sigs.k8s.io/controller-runtime/pkg/client"
"sigs.k8s.io/controller-runtime/pkg/log"
"sigs.k8s.io/kustomize/kyaml/resid"
)
type Config struct {
Log struct {
Level string `env:"LOG_LEVEL, default=fatal"`
Encoding string `env:"LOG_ENCODING, default=json"`
}
File string `env:"FILE, default=/dev/stdin"`
FailFast bool `env:"FAIL_FAST"`
AllowFailure bool `env:"ALLOW_FAILURE"`
SkipAutoNamespace bool `env:"SKIP_AUTO_NAMESPACE"`
Namespace string `env:"NAMESPACE"`
Table bool `env:"TABLE"`
ExcludeValid bool `env:"EXCLUDE_VALID"`
KubeVersion string `env:"KUBE_VERSION, default=1.28.0"`
EtcdVersion string `env:"ETCD_VERSION, default=3.5.11"`
ApiServerRegistry string `env:"API_SERVER_REGISTRY, default=registry.k8s.io/kube-apiserver"`
EtcdRegistry string `env:"ETCD_REGISTRY, default=quay.io/coreos/etcd"`
ApiServerFlags []string `env:"API_SERVER_FLAGS, delimiter=;, default=--api-server-flags=--disable-admission-plugins=MutatingAdmissionWebhook,ValidatingAdmissionPolicy,ValidatingAdmissionWebhook"`
}
var (
config = &Config{}
tbl table.Writer
output = os.Stdout
)
func init() {
flag.StringVarP(&config.Log.Level, "log-level", "l", "", "Define the log level (default is warning) [debug,info,warn,error]")
flag.StringVarP(&config.Log.Encoding, "log-encoding", "e", "", "Define the log format (default is json) [json,console]")
flag.StringVarP(&config.File, "file", "f", "", "Path to input")
flag.BoolVarP(&config.SkipAutoNamespace, "skip-auto-namespace", "", false, "Do not create a namespace if it does not exists yet while validating a resource")
flag.BoolVar(&config.AllowFailure, "allow-failure", false, "Do not exit > 0 if an error occured")
flag.BoolVar(&config.Table, "table", false, "Output as table")
flag.BoolVar(&config.ExcludeValid, "exclude-valid", false, "Only included invalid manifests in the output")
flag.StringVarP(&config.Namespace, "namespace", "", "", "Default namespace to apply to resources without a namespace")
flag.BoolVar(&config.FailFast, "fail-fast", false, "Exit early if an error occured")
flag.StringVarP(&config.KubeVersion, "kube-version", "", "", "Kubernetes version, for instead 1.27.0. If not set the latest stable one is used")
flag.StringVarP(&config.ApiServerRegistry, "api-server-registry", "", "", "OCI registry for pulling the kube-apiserver image")
flag.StringVarP(&config.EtcdRegistry, "etcd-registry", "", "", "OCI registry for pulling the etcd image")
flag.StringVarP(&config.EtcdVersion, "etcd-version", "", "", "The version for etcd")
flag.StringSliceVarP(&config.ApiServerFlags, "api-server-flags", "", nil, "Set additional kube-apiserver flags")
tbl = table.NewWriter()
tbl.SetOutputMirror(output)
tbl.AppendHeader(table.Row{"Name", " Namespace", "Kind", "GV", "Result", "Message"})
}
func main() {
ctx := context.TODO()
err := envconfig.Process(ctx, config)
must(err)
flag.Parse()
signals := make(chan os.Signal, 1)
signal.Notify(signals, syscall.SIGINT, syscall.SIGTERM)
logger, err := buildLogger()
must(err)
log.SetLogger(logger)
dockerClient, err := dockerclient.NewClientWithOpts(
dockerclient.FromEnv,
)
must(err)
dockerClient.NegotiateAPIVersion(ctx)
g := new(errgroup.Group)
g.Go(func() error {
tag, _ := strings.CutPrefix(config.EtcdVersion, "v")
return pullImage(ctx, dockerClient, logger, fmt.Sprintf("%s:v%s", config.EtcdRegistry, tag))
})
g.Go(func() error {
tag, _ := strings.CutPrefix(config.KubeVersion, "v")
return pullImage(ctx, dockerClient, logger, fmt.Sprintf("%s:v%s", config.ApiServerRegistry, tag))
})
must(g.Wait())
logger.V(1).Info("starting etcd")
etcdSpecs, err := startEtcd(ctx, dockerClient)
must(err)
authToken := make([]byte, 24)
_, err = rand.Read(authToken)
must(err)
logger.V(1).Info("starting kube-apiserver")
apiSrvSpecs, err := startAPIServer(ctx, dockerClient, etcdSpecs, authToken)
must(err)
kConfig := rest.Config{
Host: fmt.Sprintf("%s:6443", apiSrvSpecs.NetworkSettings.DefaultNetworkSettings.IPAddress),
BearerToken: fmt.Sprintf("%X", authToken),
TLSClientConfig: rest.TLSClientConfig{
Insecure: true,
},
}
f, err := os.Open(config.File)
must(err)
kubeClient, err := client.New(&kConfig, client.Options{})
must(err)
cleanup := func() {
_ = resetContainer(context.TODO(), dockerClient, "/yakmv-etcd")
_ = resetContainer(context.TODO(), dockerClient, "/yakmv-api-server")
}
defer cleanup()
go func() {
logger.Info("received os signal", "signal", <-signals)
cleanup()
os.Exit(1)
}()
err = wait.ExponentialBackoff(wait.Backoff{
Duration: time.Millisecond * 50,
Jitter: 0.1,
Steps: 10,
Factor: 2,
}, func() (bool, error) {
logger.V(1).Info("waiting for kube-apiserver")
return kubeClient.List(ctx, &corev1.NamespaceList{}) == nil, nil
})
must(err)
scheme := kubeClient.Scheme()
apiextv1.AddToScheme(scheme)
factory := serializer.NewCodecFactory(scheme)
decoder := factory.UniversalDeserializer()
var objects []client.Object
namespaces := make(indexedObjects)
var crds []client.Object
multidocReader := utilyaml.NewYAMLReader(bufio.NewReader(f))
for {
resourceYAML, err := multidocReader.Read()
if err != nil {
if err == io.EOF {
break
}
must(err)
}
obj := unstructured.Unstructured{}
_, gvk, err := decoder.Decode(
resourceYAML,
nil,
&obj)
if err != nil && !kruntime.IsMissingKind(err) {
continue
} else if kruntime.IsMissingKind(err) {
continue
}
if obj.GetNamespace() == "" {
obj.SetNamespace(config.Namespace)
}
if _, ok := namespaces[obj.GetNamespace()]; !config.SkipAutoNamespace && obj.GetNamespace() != "" && !ok {
namespaces[obj.GetNamespace()] = &corev1.Namespace{ObjectMeta: v1.ObjectMeta{Name: obj.GetNamespace()}}
}
switch *gvk {
case schema.GroupVersionKind{Group: apiextv1.SchemeGroupVersion.Group, Version: apiextv1.SchemeGroupVersion.Version, Kind: "CustomResourceDefinition"}:
crd := apiextv1.CustomResourceDefinition{}
_, _, err = decoder.Decode(
resourceYAML,
&schema.GroupVersionKind{Group: apiextv1.SchemeGroupVersion.Group, Version: apiextv1.SchemeGroupVersion.Version, Kind: "CustomResourceDefinition"},
&crd)
if err != nil {
must(err)
}
// Conversion Webhook is unsupported since there will be no pods running handling the conversion request
if crd.Spec.Conversion != nil {
crd.Spec.Conversion.Strategy = "None"
crd.Spec.Conversion.Webhook = nil
}
crds = append(crds, &crd)
case schema.GroupVersionKind{Group: "", Version: "v1", Kind: "Namespace"}:
namespaces[obj.GetName()] = &obj
default:
objects = append(objects, &obj)
}
}
sort.Slice(objects, func(i, j int) bool {
iGvk := resid.NewGvk(objects[i].GetObjectKind().GroupVersionKind().Group, objects[i].GetObjectKind().GroupVersionKind().Version, objects[i].GetObjectKind().GroupVersionKind().Kind)
jGvk := resid.NewGvk(objects[j].GetObjectKind().GroupVersionKind().Group, objects[j].GetObjectKind().GroupVersionKind().Version, objects[j].GetObjectKind().GroupVersionKind().Kind)
return iGvk.IsLessThan(jGvk)
})
sum, err := validate(ctx, kubeClient, logger, crds, namespaces.Slice(), objects)
must(err)
if config.Table {
tbl.Render()
} else {
fmt.Fprintln(output, sum.String())
}
if !config.AllowFailure && sum.errors > 0 {
os.Exit(1)
}
}
func validate(ctx context.Context, kubeClient client.Client, logger logr.Logger, objects ...[]client.Object) (summary, error) {
results := make(chan error)
total := summary{}
for _, obj := range objects {
if len(obj) == 0 {
continue
}
applyObjects(ctx, kubeClient, logger, obj, results)
sum, err := await(ctx, len(obj), results)
must(err)
total.Add(sum)
}
return total, nil
}
func await(ctx context.Context, abort int, results chan error) (summary, error) {
sum := summary{}
for {
select {
case <-ctx.Done():
return sum, nil
case err := <-results:
sum.total++
if err != nil {
sum.errors++
}
if err != nil && config.FailFast {
return sum, err
}
if sum.total == abort {
return sum, nil
}
break
}
}
}
type summary struct {
total int
errors int
}
func (s *summary) Add(sum summary) {
s.total += sum.total
s.errors += sum.errors
}
func (s *summary) String() string {
return fmt.Sprintf("total: %d, Invalid: %d", s.total, s.errors)
}
type indexedObjects map[string]client.Object
func (i indexedObjects) Slice() []client.Object {
var objects []client.Object
for _, obj := range i {
objects = append(objects, obj)
}
return objects
}
func applyObjects(ctx context.Context, kubeClient client.Client, logger logr.Logger, objects []client.Object, results chan error) {
for _, o := range objects {
obj := o
go func(obj client.Object) {
gvk := obj.GetObjectKind().GroupVersionKind()
err := kubeClient.Create(ctx, obj)
logger := logger.WithValues(
"name", obj.GetName(),
"namespace", obj.GetNamespace(),
"kind", gvk.Kind,
"group", gvk.Group,
"version", gvk.Version,
)
results <- err
if err != nil {
if kerrors.IsAlreadyExists(err) {
return
}
logger.Error(err, "failed to create resource")
if config.Table {
tbl.AppendRow([]interface{}{obj.GetName(), obj.GetNamespace(), gvk.Kind, strings.TrimLeft(fmt.Sprintf("%s/%s", gvk.Group, gvk.Version), "/"), color.RedString("FAIL"), err.Error()})
}
} else if !config.ExcludeValid {
logger.V(1).Info("resource created", "name", obj.GetName())
if config.Table {
tbl.AppendRow([]interface{}{obj.GetName(), obj.GetNamespace(), gvk.Kind, strings.TrimLeft(fmt.Sprintf("%s/%s", gvk.Group, gvk.Version), "/"), color.GreenString("VALID"), ""})
}
}
}(obj)
}
}
func buildLogger() (logr.Logger, error) {
logOpts := zap.NewDevelopmentConfig()
logOpts.Encoding = config.Log.Encoding
err := logOpts.Level.UnmarshalText([]byte(config.Log.Level))
if err != nil {
return logr.Discard(), err
}
zapLog, err := logOpts.Build()
if err != nil {
return logr.Discard(), err
}
return zapr.NewLogger(zapLog), nil
}
func must(err error) {
if err != nil {
panic(err)
}
}
func getContainerIDByName(ctx context.Context, dockerClient *dockerclient.Client, name string) (string, error) {
containers, err := dockerClient.ContainerList(ctx, types.ContainerListOptions{
All: true,
})
if err != nil {
return "", err
}
for _, container := range containers {
if slices.Contains(container.Names, name) {
return container.ID, nil
}
}
return "", errors.New("no such container found")
}
func resetContainer(ctx context.Context, dockerClient *dockerclient.Client, id string) error {
id, err := getContainerIDByName(ctx, dockerClient, id)
if err == nil {
_ = dockerClient.ContainerStop(ctx, id, container.StopOptions{})
err = dockerClient.ContainerRemove(ctx, id, types.ContainerRemoveOptions{})
if err != nil {
return err
}
}
return nil
}
func pullImage(ctx context.Context, dockerClient *dockerclient.Client, logger logr.Logger, image string) error {
images, err := dockerClient.ImageList(ctx, types.ImageListOptions{})
if err != nil {
return err
}
for _, img := range images {
if slices.Contains(img.RepoTags, image) {
logger.V(1).Info("image already exists", "tag", image)
return nil
}
}
logger.Info("pulling image", "tag", image)
w, err := dockerClient.ImagePull(ctx, image, types.ImagePullOptions{})
if err != nil {
return err
}
defer w.Close()
_, err = io.Copy(io.Discard, w)
return err
}
func startEtcd(ctx context.Context, dockerClient *dockerclient.Client) (types.ContainerJSON, error) {
tag, _ := strings.CutPrefix(config.EtcdVersion, "v")
err := resetContainer(ctx, dockerClient, "/yakmv-etcd")
if err != nil {
return types.ContainerJSON{}, err
}
cont, err := dockerClient.ContainerCreate(
ctx,
&container.Config{
Image: fmt.Sprintf("%s:v%s", config.EtcdRegistry, tag),
Cmd: strslice.StrSlice{
"/usr/local/bin/etcd",
"--advertise-client-urls=http://0.0.0.0:2379",
"--listen-client-urls=http://0.0.0.0:2379",
"--initial-advertise-peer-urls=http://0.0.0.0:2380",
"--listen-peer-urls=http://0.0.0.0:2380",
`--initial-cluster=default=http://0.0.0.0:2380`,
},
},
&container.HostConfig{}, nil, nil, "yakmv-etcd")
if err != nil {
return types.ContainerJSON{}, err
}
err = dockerClient.ContainerStart(ctx, cont.ID, types.ContainerStartOptions{})
if err != nil {
return types.ContainerJSON{}, err
}
specs, err := dockerClient.ContainerInspect(ctx, cont.ID)
if err != nil {
return types.ContainerJSON{}, err
}
return specs, nil
}
func startAPIServer(ctx context.Context, dockerClient *dockerclient.Client, etcd types.ContainerJSON, token []byte) (types.ContainerJSON, error) {
err := resetContainer(ctx, dockerClient, "/yakmv-kube-apiserver")
if err != nil {
return types.ContainerJSON{}, err
}
caPrivKey, err := rsa.GenerateKey(rand.Reader, 4096)
if err != nil {
return types.ContainerJSON{}, err
}
certDir, err := os.MkdirTemp("", "cert")
if err != nil {
return types.ContainerJSON{}, err
}
cert, err := os.Create(filepath.Join(certDir, "service-account-key.pem"))
if err != nil {
return types.ContainerJSON{}, err
}
err = pem.Encode(cert, &pem.Block{
Type: "RSA PRIVATE KEY",
Bytes: x509.MarshalPKCS1PrivateKey(caPrivKey),
})
if err != nil {
return types.ContainerJSON{}, err
}
tokenFile := fmt.Sprintf("%X,default,default", token)
err = os.WriteFile(filepath.Join(certDir, "token"), []byte(tokenFile), 0644)
if err != nil {
return types.ContainerJSON{}, err
}
cmd := append(strslice.StrSlice{
"/usr/local/bin/kube-apiserver",
fmt.Sprintf("--etcd-servers=%s:2379", etcd.NetworkSettings.DefaultNetworkSettings.IPAddress),
"--anonymous-auth",
"--service-account-issuer=https://validation",
"--service-account-key-file=/certs/service-account-key.pem",
"--service-account-signing-key-file=/certs/service-account-key.pem",
"--token-auth-file=/certs/token",
"--enable-priority-and-fairness=false",
}, config.ApiServerFlags...)
tag, _ := strings.CutPrefix(config.KubeVersion, "v")
cont, err := dockerClient.ContainerCreate(
ctx,
&container.Config{
Image: fmt.Sprintf("%s:v%s", config.ApiServerRegistry, tag),
Cmd: cmd,
},
&container.HostConfig{
Mounts: []mount.Mount{
{
Type: mount.TypeBind,
Source: certDir,
Target: "/certs",
},
},
},
nil,
nil,
"yakmv-kube-apiserver")
if err != nil {
return types.ContainerJSON{}, err
}
err = dockerClient.ContainerStart(ctx, cont.ID, types.ContainerStartOptions{})
if err != nil {
return types.ContainerJSON{}, err
}
specs, err := dockerClient.ContainerInspect(ctx, cont.ID)
if err != nil {
return types.ContainerJSON{}, err
}
return specs, nil
}