| 500e77ba | package layer import ( "archive/tar" "bytes" "io" |
| 21278efa | "io/ioutil" |
| 500e77ba |
)
// DigestSHA256EmptyTar is the canonical sha256 digest of empty tar file -
// (1024 NULL bytes)
const DigestSHA256EmptyTar = DiffID("sha256:5f70bf18a086007016e948b04aed3b82103a36bea41755b6cddfaf10ace3c6ef")
type emptyLayer struct{}
// EmptyLayer is a layer that corresponds to empty tar.
var EmptyLayer = &emptyLayer{}
|
| 21278efa |
func (el *emptyLayer) TarStream() (io.ReadCloser, error) { |
| 500e77ba | buf := new(bytes.Buffer) tarWriter := tar.NewWriter(buf) tarWriter.Close() |
| 21278efa | return ioutil.NopCloser(buf), nil |
| 500e77ba |
}
func (el *emptyLayer) ChainID() ChainID {
return ChainID(DigestSHA256EmptyTar)
}
func (el *emptyLayer) DiffID() DiffID {
return DigestSHA256EmptyTar
}
func (el *emptyLayer) Parent() Layer {
return nil
}
func (el *emptyLayer) Size() (size int64, err error) {
return 0, nil
}
func (el *emptyLayer) DiffSize() (size int64, err error) {
return 0, nil
}
func (el *emptyLayer) Metadata() (map[string]string, error) {
return make(map[string]string), nil
} |