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image_cat_manifest.go
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image_cat_manifest.go
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// Copyright 2015 The rkt 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 main
import (
"encoding/json"
"github.com/coreos/rkt/store/imagestore"
"github.com/spf13/cobra"
)
var (
cmdImageCatManifest = &cobra.Command{
Use: "cat-manifest IMAGE",
Short: "Inspect and print the image manifest",
Long: `IMAGE should be a string referencing an image; either a ID or an image name.`,
Run: runWrapper(runImageCatManifest),
}
flagPrettyPrint bool
)
func init() {
cmdImage.AddCommand(cmdImageCatManifest)
cmdImageCatManifest.Flags().BoolVar(&flagPrettyPrint, "pretty-print", true, "apply indent to format the output")
}
func runImageCatManifest(cmd *cobra.Command, args []string) (exit int) {
if len(args) != 1 {
cmd.Usage()
return 254
}
s, err := imagestore.NewStore(storeDir())
if err != nil {
stderr.PrintE("cannot open store", err)
return 254
}
key, err := getStoreKeyFromAppOrHash(s, args[0])
if err != nil {
stderr.Error(err)
return 254
}
manifest, err := s.GetImageManifest(key)
if err != nil {
stderr.PrintE("cannot get image manifest", err)
return 254
}
var b []byte
if flagPrettyPrint {
b, err = json.MarshalIndent(manifest, "", "\t")
} else {
b, err = json.Marshal(manifest)
}
if err != nil {
stderr.PrintE("cannot read the image manifest", err)
return 254
}
stdout.Print(string(b))
return 0
}