package chrootarchive import ( "fmt" "io/ioutil" "os" "path/filepath" "strings" "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 archive.Reader, decompress bool) (size int64, err error) { dest = filepath.Clean(dest) // Ensure it is a Windows-style volume path if !strings.HasPrefix(dest, `\\?\`) { dest = `\\?\` + dest } if decompress { decompressed, err := archive.DecompressStream(layer) if err != nil { return 0, err } defer decompressed.Close() layer = decompressed } tmpDir, err := ioutil.TempDir(os.Getenv("temp"), "temp-docker-extract") if err != nil { return 0, fmt.Errorf("ApplyLayer failed to create temp-docker-extract under %s. %s", dest, err) } s, err := archive.UnpackLayer(dest, layer) os.RemoveAll(tmpDir) if err != nil { return 0, fmt.Errorf("ApplyLayer %s failed UnpackLayer to %s", err, dest) } return s, nil }