diff --git a/gapi/helpers.go b/gapi/helpers.go
index ddf4965c..93fd7b8c 100644
--- a/gapi/helpers.go
+++ b/gapi/helpers.go
@@ -42,8 +42,15 @@ func CopyFileToFs(fs engine.Fs, src, dst string) error {
 	return nil
 }
 
-// CopyStringToFs copies a file from src path on the local fs to a dst path on
-// fs.
+// CopyBytesToFs copies a list of bytes to a dst path on fs.
+func CopyBytesToFs(fs engine.Fs, b []byte, dst string) error {
+	if err := fs.WriteFile(dst, b, Umask); err != nil {
+		return errwrap.Wrapf(err, "can't write to file `%s`", dst)
+	}
+	return nil
+}
+
+// CopyStringToFs copies a string to a dst path on fs.
 func CopyStringToFs(fs engine.Fs, str, dst string) error {
 	if err := fs.WriteFile(dst, []byte(str), Umask); err != nil {
 		return errwrap.Wrapf(err, "can't write to file `%s`", dst)