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ctl.go
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ctl.go
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package kube
import (
"bytes"
"encoding/json"
"fmt"
"io/ioutil"
"os/exec"
"strings"
"github.com/Masterminds/semver"
"github.com/pkg/errors"
log "github.com/sirupsen/logrus"
metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
"k8s.io/apimachinery/pkg/apis/meta/v1/unstructured"
"k8s.io/apimachinery/pkg/runtime/schema"
"k8s.io/apimachinery/pkg/types"
"k8s.io/client-go/discovery"
"k8s.io/client-go/dynamic"
"k8s.io/client-go/kubernetes"
"k8s.io/client-go/rest"
"github.com/argoproj/argo-cd/util"
"github.com/argoproj/argo-cd/util/diff"
)
var (
ingressDeprecationVersion = semver.MustParse("v1.14.0")
)
type Kubectl interface {
ApplyResource(config *rest.Config, obj *unstructured.Unstructured, namespace string, dryRun, force bool) (string, error)
ConvertToVersion(obj *unstructured.Unstructured, group, version string) (*unstructured.Unstructured, error)
DeleteResource(config *rest.Config, gvk schema.GroupVersionKind, name string, namespace string, forceDelete bool) error
GetResource(config *rest.Config, gvk schema.GroupVersionKind, name string, namespace string) (*unstructured.Unstructured, error)
PatchResource(config *rest.Config, gvk schema.GroupVersionKind, name string, namespace string, patchType types.PatchType, patchBytes []byte) (*unstructured.Unstructured, error)
GetAPIResources(config *rest.Config, resourceFilter ResourceFilter) ([]APIResourceInfo, error)
}
type KubectlCmd struct{}
type APIResourceInfo struct {
GroupKind schema.GroupKind
Meta metav1.APIResource
Interface dynamic.ResourceInterface
}
type filterFunc func(apiResource *metav1.APIResource) bool
func filterAPIResources(config *rest.Config, resourceFilter ResourceFilter, filter filterFunc, namespace string) ([]APIResourceInfo, error) {
dynamicIf, err := dynamic.NewForConfig(config)
if err != nil {
return nil, err
}
disco, err := discovery.NewDiscoveryClientForConfig(config)
if err != nil {
return nil, err
}
versionInfo, err := disco.ServerVersion()
if err != nil {
return nil, err
}
version, err := semver.NewVersion(versionInfo.String())
if err != nil {
return nil, err
}
serverResources, err := disco.ServerPreferredResources()
if err != nil {
if len(serverResources) == 0 {
return nil, err
}
log.Warnf("Partial success when performing preferred resource discovery: %v", err)
}
apiResIfs := make([]APIResourceInfo, 0)
for _, apiResourcesList := range serverResources {
gv, err := schema.ParseGroupVersion(apiResourcesList.GroupVersion)
if err != nil {
gv = schema.GroupVersion{}
}
for _, apiResource := range apiResourcesList.APIResources {
if resourceFilter.IsExcludedResource(gv.Group, apiResource.Kind, config.Host) {
continue
}
if _, ok := isObsoleteExtensionsGroupKind(gv.Group, apiResource.Kind); ok &&
// Edge case for deprecated Ingress kind.
!(gv.Group == "extensions" && apiResource.Kind == IngressKind && version.LessThan(ingressDeprecationVersion)) {
continue
}
if filter(&apiResource) {
resource := ToGroupVersionResource(apiResourcesList.GroupVersion, &apiResource)
resourceIf := ToResourceInterface(dynamicIf, &apiResource, resource, namespace)
gv, err := schema.ParseGroupVersion(apiResourcesList.GroupVersion)
if err != nil {
return nil, err
}
apiResIf := APIResourceInfo{
GroupKind: schema.GroupKind{Group: gv.Group, Kind: apiResource.Kind},
Meta: apiResource,
Interface: resourceIf,
}
apiResIfs = append(apiResIfs, apiResIf)
}
}
}
return apiResIfs, nil
}
// isSupportedVerb returns whether or not a APIResource supports a specific verb
func isSupportedVerb(apiResource *metav1.APIResource, verb string) bool {
for _, v := range apiResource.Verbs {
if v == verb {
return true
}
}
return false
}
func (k KubectlCmd) GetAPIResources(config *rest.Config, resourceFilter ResourceFilter) ([]APIResourceInfo, error) {
apiResIfs, err := filterAPIResources(config, resourceFilter, func(apiResource *metav1.APIResource) bool {
return isSupportedVerb(apiResource, listVerb) && isSupportedVerb(apiResource, watchVerb)
}, "")
if err != nil {
return nil, err
}
return apiResIfs, err
}
// GetResource returns resource
func (k KubectlCmd) GetResource(config *rest.Config, gvk schema.GroupVersionKind, name string, namespace string) (*unstructured.Unstructured, error) {
dynamicIf, err := dynamic.NewForConfig(config)
if err != nil {
return nil, err
}
disco, err := discovery.NewDiscoveryClientForConfig(config)
if err != nil {
return nil, err
}
apiResource, err := ServerResourceForGroupVersionKind(disco, gvk)
if err != nil {
return nil, err
}
resource := gvk.GroupVersion().WithResource(apiResource.Name)
resourceIf := ToResourceInterface(dynamicIf, apiResource, resource, namespace)
return resourceIf.Get(name, metav1.GetOptions{})
}
// PatchResource patches resource
func (k KubectlCmd) PatchResource(config *rest.Config, gvk schema.GroupVersionKind, name string, namespace string, patchType types.PatchType, patchBytes []byte) (*unstructured.Unstructured, error) {
dynamicIf, err := dynamic.NewForConfig(config)
if err != nil {
return nil, err
}
disco, err := discovery.NewDiscoveryClientForConfig(config)
if err != nil {
return nil, err
}
apiResource, err := ServerResourceForGroupVersionKind(disco, gvk)
if err != nil {
return nil, err
}
resource := gvk.GroupVersion().WithResource(apiResource.Name)
resourceIf := ToResourceInterface(dynamicIf, apiResource, resource, namespace)
return resourceIf.Patch(name, patchType, patchBytes, metav1.UpdateOptions{})
}
// DeleteResource deletes resource
func (k KubectlCmd) DeleteResource(config *rest.Config, gvk schema.GroupVersionKind, name string, namespace string, forceDelete bool) error {
dynamicIf, err := dynamic.NewForConfig(config)
if err != nil {
return err
}
disco, err := discovery.NewDiscoveryClientForConfig(config)
if err != nil {
return err
}
apiResource, err := ServerResourceForGroupVersionKind(disco, gvk)
if err != nil {
return err
}
resource := gvk.GroupVersion().WithResource(apiResource.Name)
resourceIf := ToResourceInterface(dynamicIf, apiResource, resource, namespace)
propagationPolicy := metav1.DeletePropagationForeground
deleteOptions := &metav1.DeleteOptions{PropagationPolicy: &propagationPolicy}
if forceDelete {
propagationPolicy = metav1.DeletePropagationBackground
zeroGracePeriod := int64(0)
deleteOptions.GracePeriodSeconds = &zeroGracePeriod
}
return resourceIf.Delete(name, deleteOptions)
}
// ApplyResource performs an apply of a unstructured resource
func (k KubectlCmd) ApplyResource(config *rest.Config, obj *unstructured.Unstructured, namespace string, dryRun, force bool) (string, error) {
log.Infof("Applying resource %s/%s in cluster: %s, namespace: %s", obj.GetKind(), obj.GetName(), config.Host, namespace)
f, err := ioutil.TempFile(util.TempDir, "")
if err != nil {
return "", fmt.Errorf("Failed to generate temp file for kubeconfig: %v", err)
}
_ = f.Close()
err = WriteKubeConfig(config, namespace, f.Name())
if err != nil {
return "", fmt.Errorf("Failed to write kubeconfig: %v", err)
}
defer util.DeleteFile(f.Name())
manifestBytes, err := json.Marshal(obj)
if err != nil {
return "", err
}
var out []string
// If it is an RBAC resource, run `kubectl auth reconcile`. This is preferred over
// `kubectl apply`, which cannot tolerate changes in roleRef, which is an immutable field.
// See: https://github.com/kubernetes/kubernetes/issues/66353
// `auth reconcile` will delete and recreate the resource if necessary
if obj.GetAPIVersion() == "rbac.authorization.k8s.io/v1" {
// `kubectl auth reconcile` has a side effect of auto-creating namespaces if it doesn't exist.
// See: https://github.com/kubernetes/kubernetes/issues/71185. This is behavior which we do
// not want. We need to check if the namespace exists, before know if it is safe to run this
// command. Skip this for dryRuns.
if !dryRun && namespace != "" {
kubeClient, err := kubernetes.NewForConfig(config)
if err != nil {
return "", err
}
_, err = kubeClient.CoreV1().Namespaces().Get(namespace, metav1.GetOptions{})
if err != nil {
return "", err
}
}
outReconcile, err := runKubectl(f.Name(), namespace, []string{"auth", "reconcile"}, manifestBytes, dryRun)
if err != nil {
return "", err
}
out = append(out, outReconcile)
// We still want to fallthrough and run `kubectl apply` in order set the
// last-applied-configuration annotation in the object.
}
// Run kubectl apply
applyArgs := []string{"apply"}
if force {
applyArgs = append(applyArgs, "--force")
}
outApply, err := runKubectl(f.Name(), namespace, applyArgs, manifestBytes, dryRun)
if err != nil {
return "", err
}
out = append(out, outApply)
return strings.Join(out, ". "), nil
}
func runKubectl(kubeconfigPath string, namespace string, args []string, manifestBytes []byte, dryRun bool) (string, error) {
cmdArgs := append([]string{"--kubeconfig", kubeconfigPath, "-f", "-"}, args...)
if namespace != "" {
cmdArgs = append(cmdArgs, "-n", namespace)
}
if dryRun {
cmdArgs = append(cmdArgs, "--dry-run")
}
cmd := exec.Command("kubectl", cmdArgs...)
log.Info(cmd.Args)
if log.IsLevelEnabled(log.DebugLevel) {
var obj unstructured.Unstructured
err := json.Unmarshal(manifestBytes, &obj)
if err != nil {
return "", err
}
redacted, _, err := diff.HideSecretData(&obj, nil)
if err != nil {
return "", err
}
redactedBytes, err := json.Marshal(redacted)
if err != nil {
return "", err
}
log.Debug(string(redactedBytes))
}
cmd.Stdin = bytes.NewReader(manifestBytes)
out, err := cmd.Output()
if err != nil {
if exErr, ok := err.(*exec.ExitError); ok {
errMsg := cleanKubectlOutput(string(exErr.Stderr))
return "", errors.New(errMsg)
}
return "", err
}
return strings.TrimSpace(string(out)), nil
}
// ConvertToVersion converts an unstructured object into the specified group/version
func (k KubectlCmd) ConvertToVersion(obj *unstructured.Unstructured, group string, version string) (*unstructured.Unstructured, error) {
gvk := obj.GroupVersionKind()
if gvk.Group == group && gvk.Version == version {
return obj.DeepCopy(), nil
}
newGroup, isObsoleteKind := obsoleteExtensionsKinds[gvk.Kind]
// If converting from or to obsolete kind from 'extensions' group when just replace group, version, kind without real conversion.
if gvk.Group == "extensions" && isObsoleteKind || isObsoleteKind && group == "extensions" && newGroup == gvk.Group {
converted := obj.DeepCopy()
converted.SetGroupVersionKind(schema.GroupVersionKind{
Kind: gvk.Kind,
Group: group,
Version: version,
})
return converted, nil
}
manifestBytes, err := json.Marshal(obj)
if err != nil {
return nil, err
}
f, err := ioutil.TempFile(util.TempDir, "")
if err != nil {
return nil, fmt.Errorf("Failed to generate temp file for kubectl: %v", err)
}
_ = f.Close()
if err := ioutil.WriteFile(f.Name(), manifestBytes, 0600); err != nil {
return nil, err
}
defer util.DeleteFile(f.Name())
outputVersion := fmt.Sprintf("%s/%s", group, version)
cmd := exec.Command("kubectl", "convert", "--output-version", outputVersion, "-o", "json", "--local=true", "-f", f.Name())
cmd.Stdin = bytes.NewReader(manifestBytes)
out, err := cmd.Output()
if err != nil {
if exErr, ok := err.(*exec.ExitError); ok {
errMsg := cleanKubectlOutput(string(exErr.Stderr))
return nil, errors.New(errMsg)
}
return nil, fmt.Errorf("failed to convert %s/%s to %s/%s", obj.GetKind(), obj.GetName(), group, version)
}
// NOTE: when kubectl convert runs against stdin (i.e. kubectl convert -f -), the output is
// a unstructured list instead of an unstructured object
var convertedObj unstructured.Unstructured
err = json.Unmarshal(out, &convertedObj)
if err != nil {
return nil, err
}
if convertedObj.GetNamespace() == "" {
convertedObj.SetNamespace(obj.GetNamespace())
}
return &convertedObj, nil
}