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// Copyright 2016 The Linux Foundation
//
// 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 (
"fmt"
"log"
"os"
"strings"
"github.com/opencontainers/image-spec/image"
"github.com/spf13/cobra"
)
// supported unpack types
var unpackTypes = []string{
typeImageLayout,
typeImage,
}
type unpackCmd struct {
stdout *log.Logger
stderr *log.Logger
typ string // the type to unpack, can be empty string
ref string
}
func newUnpackCmd(stdout, stderr *log.Logger) *cobra.Command {
v := &unpackCmd{
stdout: stdout,
stderr: stderr,
}
cmd := &cobra.Command{
Use: "unpack [src] [dest]",
Short: "Unpack an image or image source layout",
Long: `Unpack the OCI image .tar file or OCI image layout directory present at [src] to the destination directory [dest].`,
Run: v.Run,
}
cmd.Flags().StringVar(
&v.typ, "type", "",
fmt.Sprintf(
`Type of the file to unpack. If unset, oci-image-tool will try to auto-detect the type. One of "%s"`,
strings.Join(unpackTypes, ","),
),
)
cmd.Flags().StringVar(
&v.ref, "ref", "v1.0",
`The ref pointing to the manifest to be unpacked. This must be present in the "refs" subdirectory of the image.`,
)
return cmd
}
func (v *unpackCmd) Run(cmd *cobra.Command, args []string) {
if len(args) != 2 {
v.stderr.Print("both src and dest must be provided")
if err := cmd.Usage(); err != nil {
v.stderr.Println(err)
}
os.Exit(1)
}
if v.typ == "" {
typ, err := autodetect(args[0])
if err != nil {
v.stderr.Printf("%q: autodetection failed: %v", args[0], err)
os.Exit(1)
}
v.typ = typ
}
var err error
switch v.typ {
case typeImageLayout:
err = image.UnpackLayout(args[0], args[1], v.ref)
case typeImage:
err = image.Unpack(args[0], args[1], v.ref)
}
if err != nil {
v.stderr.Printf("unpacking failed: %v", err)
os.Exit(1)
}
os.Exit(0)
}
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