fix root; fix directory creation

src/sync.rs

@@ -162,7 +162,10 @@ pub(crate) fn sync(
 
             if !target.exists() {
                 println!("[info] copying from {:?} to {:?}.", source, target);
-                fs::create_dir_all(target.parent().unwrap())?;
+                let parent = target.parent().unwrap();
+                if !parent.exists() {
+                    fs::create_dir_all(parent)?;
+                }
                 fs::copy(source, target)?;
             }
         }