From adbb635ff67015805f4dc2ff61e6613b6324d888 Mon Sep 17 00:00:00 2001
From: ThetaSinner <ThetaSinner@users.noreply.github.com>
Date: Tue, 4 Jun 2024 14:34:41 +0100
Subject: [PATCH] Support no happs required

---
 nix/modules/happs.nix            | 4 ++++
 nix/modules/scenario.nix         | 2 +-
 scenarios/remote_call/Cargo.toml | 2 ++
 3 files changed, 7 insertions(+), 1 deletion(-)

diff --git a/nix/modules/happs.nix b/nix/modules/happs.nix
index aa565f62..4d2cc7cb 100644
--- a/nix/modules/happs.nix
+++ b/nix/modules/happs.nix
@@ -162,6 +162,10 @@
             ];
 
             postInstall = ''
+              # Ensure the derivation is not empty if there are ne hApps requested
+              mkdir -p $out
+              touch $out/.happ-build
+
               ${mkDnaBuildScripts (map mkDnaManifest requiredDnas)}
               ${mkHappBuildScripts (map mkHappManifest requiredHapps)}
             '';
diff --git a/nix/modules/scenario.nix b/nix/modules/scenario.nix
index ff59ce9a..2d859c6f 100644
--- a/nix/modules/scenario.nix
+++ b/nix/modules/scenario.nix
@@ -43,7 +43,7 @@
               cp "${scenarioBinary}/bin/${name}" $out/bin/
 
               mkdir -p $out/happs
-              cp ${scenarioHapps}/*.happ $out/happs
+              cp ${scenarioHapps}/.happ-build ${scenarioHapps}/*.happ $out/happs
             '';
           };
       };
diff --git a/scenarios/remote_call/Cargo.toml b/scenarios/remote_call/Cargo.toml
index 4868e50f..68fb61c0 100644
--- a/scenarios/remote_call/Cargo.toml
+++ b/scenarios/remote_call/Cargo.toml
@@ -14,3 +14,5 @@ happ_builder = { workspace = true }
 
 [lints]
 workspace = true
+
+[package.metadata]