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signature.go
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signature.go
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// Copyright © 2022 The Tekton Authors.
//
// 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
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// 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.
package chain
import (
"context"
"fmt"
"github.com/spf13/cobra"
"github.com/tektoncd/chains/pkg/chains/objects"
"github.com/tektoncd/cli/pkg/actions"
"github.com/tektoncd/cli/pkg/chain"
"github.com/tektoncd/cli/pkg/cli"
"github.com/tektoncd/pipeline/pkg/apis/pipeline/v1beta1"
metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
)
func signatureCommand(p cli.Params) *cobra.Command {
c := &cobra.Command{
Use: "signature",
Short: "Print Tekton Chains' signature for a specific taskrun",
Annotations: map[string]string{
"commandType": "main",
},
Args: cobra.ExactArgs(1),
RunE: func(cmd *cobra.Command, args []string) error {
// Get the task name.
taskName := args[0]
chainsNamespace, err := cmd.Flags().GetString("chains-namespace")
if err != nil {
return fmt.Errorf("error: output option not set properly: %v", err)
}
// Get the Tekton clients.
cs, err := p.Clients()
if err != nil {
return fmt.Errorf("failed to create tekton client")
}
var taskrun *v1beta1.TaskRun
if err = actions.GetV1(taskrunGroupResource, cs, taskName, p.Namespace(), metav1.GetOptions{}, &taskrun); err != nil {
return fmt.Errorf("failed to get TaskRun %s: %v", taskName, err)
}
return printSignatures(cs, chainsNamespace, taskrun)
},
}
return c
}
func printSignatures(cs *cli.Clients, namespace string, tr *v1beta1.TaskRun) error {
// Get the storage backend.
backends, opts, err := chain.GetTaskRunBackends(cs, namespace, tr)
if err != nil {
return fmt.Errorf("failed to retrieve the backend storage: %v", err)
}
for _, backend := range backends {
// Some limitations occur when the backend is OCI.
if backend.Type() == "oci" {
// The key must be fetched from the secrets.
opts.FullKey = fmt.Sprintf(x509Keypair, namespace)
}
// Fetch the signature.
trObj := objects.NewTaskRunObject(tr)
signatures, err := backend.RetrieveSignatures(context.Background(), trObj, opts)
if err != nil {
return fmt.Errorf("error retrieving the signatures: %s", err)
}
if len(signatures) == 0 {
fmt.Printf("No signatures found for taskrun %s\n", tr.Name)
return nil
}
// Display the signature.
for _, signature := range signatures {
fmt.Println(signature)
}
}
return nil
}