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main.go
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main.go
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package main
import (
"context"
"flag"
"fmt"
"path/filepath"
"strings"
metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
"k8s.io/apimachinery/pkg/apis/meta/v1/unstructured"
"k8s.io/apimachinery/pkg/runtime/schema"
"k8s.io/client-go/discovery"
"k8s.io/client-go/dynamic"
_ "k8s.io/client-go/plugin/pkg/client/auth/gcp"
"k8s.io/client-go/tools/clientcmd"
"k8s.io/client-go/util/homedir"
)
func main() {
var kubeconfig *string
var label *string
var namespace *string
var all *bool
if home := homedir.HomeDir(); home != "" {
kubeconfig = flag.String("kubeconfig", filepath.Join(home, ".kube", "config"), "(optional) absolute path to the kubeconfig file")
} else {
kubeconfig = flag.String("kubeconfig", "", "absolute path to the kubeconfig file")
}
label = flag.String("l", "", "label selector")
namespace = flag.String("n", "", "namespace selector")
all = flag.Bool("a", false, "include non-namespaced object")
flag.Parse()
ctx := context.TODO()
// use the current context in kubeconfig
config, err := clientcmd.BuildConfigFromFlags("", *kubeconfig)
if err != nil {
panic(err.Error())
}
// Create client set (discovery and dynamic)
clientsetDynamic, err := dynamic.NewForConfig(config)
if err != nil {
panic(err.Error())
}
clientsetDiscovery, err := discovery.NewDiscoveryClientForConfig(config)
if err != nil {
panic(err.Error())
}
var namespaces []string = []string{*namespace}
if *namespace == "" {
namespaces, err = getNamespace(clientsetDynamic, ctx)
if err != nil {
panic(err)
}
}
// Search for namespaced resources
r, err := clientsetDiscovery.ServerPreferredResources()
if err != nil {
panic(err)
}
for _, v := range r {
group, _ := schema.ParseGroupVersion(v.GroupVersion)
for _, a := range v.APIResources {
// If the resource cannot be listed, there is no way to get information about it.
if !strings.Contains(a.Verbs.String(), "list") {
continue
}
// Generate a resource id to identify which resource we want
resourceId := schema.GroupVersionResource{
Group: group.Group,
Version: group.Version,
Resource: a.Name,
}
// Get resources
var result *unstructured.UnstructuredList
if a.Namespaced {
for _, n := range namespaces {
result, err = clientsetDynamic.Resource(resourceId).Namespace(n).List(ctx, metav1.ListOptions{LabelSelector: *label})
if err != nil {
fmt.Printf("err: '%v' ressource: '%s/%s'\n", err, group.String(), a.Name)
}
printResult(result)
}
} else if *all {
result, err = clientsetDynamic.Resource(resourceId).List(ctx, metav1.ListOptions{LabelSelector: *label})
if err != nil {
fmt.Printf("err: '%v' ressource: '%s/%s'\n", err, group.String(), a.Name)
}
printResult(result)
}
}
}
}
func printResult(result *unstructured.UnstructuredList) {
if len(result.Items) > 0 {
for _, item := range result.Items {
fmt.Printf("%s: %s/%s\n", item.GetKind(), item.GetNamespace(), item.GetName())
}
}
}
func getNamespace(c dynamic.Interface, ctx context.Context) ([]string, error) {
var namespaces []string
namespaceResourceId := schema.GroupVersionResource{
Version: "v1",
Resource: "namespaces",
}
result, err := c.Resource(namespaceResourceId).List(ctx, metav1.ListOptions{})
if err != nil {
return nil, err
}
for _, v := range result.Items {
namespaces = append(namespaces, v.GetName())
}
return namespaces, nil
}