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✨ Use OpenAPI schema to handle publishing non-CRD based resources #29
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| Original file line number | Diff line number | Diff line change |
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| @@ -0,0 +1,17 @@ | ||
| # CRD Puller | ||
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| The `crd-puller` can be used for testing and development in order to export a | ||
| CustomResourceDefinition for any Group/Version/Kind (GVK) in a Kubernetes cluster. | ||
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| The main difference between this and kcp's own `crd-puller` is that this one | ||
| works based on GVKs and not resources (i.e. on `apps/v1 Deployment` instead of | ||
| `apps.deployments`). This is more useful since a PublishedResource publishes a | ||
| specific Kind and version. | ||
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| ## Usage | ||
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| ```shell | ||
| export KUBECONFIG=/path/to/kubeconfig | ||
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| ./crd-puller Deployment.v1.apps.k8s.io | ||
| ``` |
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|---|---|---|
| @@ -0,0 +1,81 @@ | ||
| /* | ||
| Copyright 2025 The KCP Authors. | ||
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| Licensed under the Apache License, Version 2.0 (the "License"); | ||
| you may not use this file except in compliance with the License. | ||
| You may obtain a copy of the License at | ||
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| http://www.apache.org/licenses/LICENSE-2.0 | ||
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| Unless required by applicable law or agreed to in writing, software | ||
| distributed under the License is distributed on an "AS IS" BASIS, | ||
| WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. | ||
| See the License for the specific language governing permissions and | ||
| limitations under the License. | ||
| */ | ||
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| package main | ||
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| import ( | ||
| "context" | ||
| "fmt" | ||
| "log" | ||
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| "github.com/spf13/pflag" | ||
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| "github.com/kcp-dev/api-syncagent/internal/discovery" | ||
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| "k8s.io/apimachinery/pkg/runtime/schema" | ||
| "k8s.io/client-go/tools/clientcmd" | ||
| "sigs.k8s.io/yaml" | ||
| ) | ||
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| var ( | ||
| kubeconfigPath string | ||
| ) | ||
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| func main() { | ||
| ctx := context.Background() | ||
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| pflag.StringVar(&kubeconfigPath, "kubeconfig", "", "Path to the kubeconfig file to use (defaults to $KUBECONFIG)") | ||
| pflag.Parse() | ||
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| if pflag.NArg() == 0 { | ||
| log.Fatal("No argument given. Please specify a GVK in the form 'Kind.version.apigroup.com' to pull.") | ||
| } | ||
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| gvk, _ := schema.ParseKindArg(pflag.Arg(0)) | ||
| if gvk == nil { | ||
| log.Fatal("Invalid GVK, please use the format 'Kind.version.apigroup.com'.") | ||
| } | ||
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| loadingRules := clientcmd.NewDefaultClientConfigLoadingRules() | ||
| loadingRules.ExplicitPath = kubeconfigPath | ||
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| startingConfig, err := loadingRules.GetStartingConfig() | ||
| if err != nil { | ||
| log.Fatalf("Failed to load Kubernetes configuration: %v.", err) | ||
| } | ||
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| config, err := clientcmd.NewDefaultClientConfig(*startingConfig, nil).ClientConfig() | ||
| if err != nil { | ||
| log.Fatalf("Failed to load Kubernetes configuration: %v.", err) | ||
| } | ||
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| discoveryClient, err := discovery.NewClient(config) | ||
| if err != nil { | ||
| log.Fatalf("Failed to create discovery client: %v.", err) | ||
| } | ||
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| crd, err := discoveryClient.RetrieveCRD(ctx, *gvk) | ||
| if err != nil { | ||
| log.Fatalf("Failed to pull CRD: %v.", err) | ||
| } | ||
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| enc, err := yaml.Marshal(crd) | ||
| if err != nil { | ||
| log.Fatalf("Failed to encode CRD as YAML: %v.", err) | ||
| } | ||
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| fmt.Println(string(enc)) | ||
| } |
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