/
unpack.go
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/
unpack.go
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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"
"strings"
"github.com/opencontainers/image-tools/image"
"github.com/urfave/cli"
)
// supported unpack types
var unpackTypes = []string{
image.TypeImageLayout,
image.TypeImage,
image.TypeImageZip,
}
type unpackCmd struct {
typ string // the type to unpack, can be empty string
ref string
platform string
}
func unpackHandle(context *cli.Context) error {
if len(context.Args()) != 2 {
return fmt.Errorf("both src and dest must be provided")
}
v := unpackCmd{
typ: context.String("type"),
ref: context.String("ref"),
platform: context.String("platform"),
}
if v.typ == "" {
typ, err := image.Autodetect(context.Args()[0])
if err != nil {
return fmt.Errorf("%q: autodetection failed: %v", context.Args()[0], err)
}
v.typ = typ
}
var err error
switch v.typ {
case image.TypeImageLayout:
err = image.UnpackLayout(context.Args()[0], context.Args()[1], v.ref, v.platform)
case image.TypeImageZip:
err = image.UnpackZip(context.Args()[0], context.Args()[1], v.ref, v.platform)
case image.TypeImage:
err = image.UnpackFile(context.Args()[0], context.Args()[1], v.ref, v.platform)
default:
err = fmt.Errorf("cannot unpack %q", v.typ)
}
return err
}
var unpackCommand = cli.Command{
Name: "unpack",
Usage: "Unpack an image or image source layout",
Action: unpackHandle,
Flags: []cli.Flag{
cli.StringFlag{
Name: "type",
Usage: 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, ","),
),
},
cli.StringFlag{
Name: "ref",
Value: "v1.0",
Usage: "The ref pointing to the manifest of the OCI image. This must be present in the 'refs' subdirectory of the image.",
},
cli.StringFlag{
Name: "platform",
Usage: "Specify the os and architecture of the manifest, format is OS:Architecture. Only applicable if reftype is index.",
},
},
}