show copy progress

Author: nrdxp

src/push.rs

@@ -128,6 +128,7 @@ impl<'a> CopyCommand<'a> {
         let mut cmd = Command::new("nix");
 
         cmd.arg("copy");
+        cmd.arg("-L");
 
         if !self.fast_connection {
             cmd.arg("--substitute-on-destination");