From beb157dcb68d9c620673c134a647cc1ad3f414f7 Mon Sep 17 00:00:00 2001
From: emilylange <git@emilylange.de>
Date: Tue, 23 May 2023 15:49:52 +0200
Subject: [PATCH] ssh: fix substitution when using experimental `nix copy`

---
 src/nix/host/ssh.rs | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/src/nix/host/ssh.rs b/src/nix/host/ssh.rs
index d45ed99..1622007 100644
--- a/src/nix/host/ssh.rs
+++ b/src/nix/host/ssh.rs
@@ -273,7 +273,11 @@ impl Ssh {
             ]);
 
             if options.use_substitutes {
-                command.arg("--substitute-on-destination");
+                command.args(&[
+                    "--substitute-on-destination",
+                    // needed due to UX bug in ssh-ng://
+                    "--builders-use-substitutes",
+                ]);
             }
 
             if let Some("drv") = path.extension().and_then(OsStr::to_str) {