remove pkg/transport and use the one from distribution

Signed-off-by: Tibor Vass <tibor@docker.com>

ioutils/readers.go

@@ -225,3 +225,29 @@ func HashData(src io.Reader) (string, error) {
 	}
 	return "sha256:" + hex.EncodeToString(h.Sum(nil)), nil
 }
+
+type OnEOFReader struct {
+	Rc io.ReadCloser
+	Fn func()
+}
+
+func (r *OnEOFReader) Read(p []byte) (n int, err error) {
+	n, err = r.Rc.Read(p)
+	if err == io.EOF {
+		r.runFunc()
+	}
+	return
+}
+
+func (r *OnEOFReader) Close() error {
+	err := r.Rc.Close()
+	r.runFunc()
+	return err
+}
+
+func (r *OnEOFReader) runFunc() {
+	if fn := r.Fn; fn != nil {
+		fn()
+		r.Fn = nil
+	}
+}