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// Copyright 2020 Google LLC All Rights Reserved.
//
// 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 cmd
import (
"fmt"
"io"
"github.com/google/go-containerregistry/pkg/crane"
"github.com/spf13/cobra"
)
// NewCmdBlob creates a new cobra.Command for the blob subcommand.
func NewCmdBlob(options *[]crane.Option) *cobra.Command {
return &cobra.Command{
Use: "blob BLOB",
Short: "Read a blob from the registry",
Example: "crane blob ubuntu@sha256:4c1d20cdee96111c8acf1858b62655a37ce81ae48648993542b7ac363ac5c0e5 > blob.tar.gz",
Args: cobra.ExactArgs(1),
RunE: func(cmd *cobra.Command, args []string) error {
src := args[0]
layer, err := crane.PullLayer(src, *options...)
if err != nil {
return fmt.Errorf("pulling layer %s: %w", src, err)
}
blob, err := layer.Compressed()
if err != nil {
return fmt.Errorf("fetching blob %s: %w", src, err)
}
if _, err := io.Copy(cmd.OutOrStdout(), blob); err != nil {
return fmt.Errorf("copying blob %s: %w", src, err)
}
return nil
},
}
}
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