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package chrootarchive // import "github.com/docker/docker/pkg/chrootarchive"
import (
"fmt"
"io"
"path/filepath"
"github.com/docker/docker/pkg/archive"
)
// applyLayerHandler parses a diff in the standard layer format from `layer`, and
// applies it to the directory `dest`. Returns the size in bytes of the
// contents of the layer.
func applyLayerHandler(dest string, layer io.Reader, options *archive.TarOptions, decompress bool) (size int64, err error) {
if decompress {
decompressed, err := archive.DecompressStream(layer)
if err != nil {
return 0, err
}
defer decompressed.Close()
layer = decompressed
}
// Ensure it is a Windows-style volume path
dest = addLongPathPrefix(filepath.Clean(dest))
s, err := archive.UnpackLayer(dest, layer, nil)
if err != nil {
return 0, fmt.Errorf("ApplyLayer %s failed UnpackLayer to %s: %s", layer, dest, err)
}
return s, nil
}
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