From bf31528ed1a29bc8eb439308edd457634c91c02e Mon Sep 17 00:00:00 2001
From: figsoda <figsoda@pm.me>
Date: Sat, 27 May 2023 11:09:44 -0400
Subject: [PATCH] writeTextFile: set meta.mainProgram based on destination

(cherry picked from commit 4b94ae4bc62e7fb2b05da58ca997fd6c3c218a85)
---
 pkgs/build-support/trivial-builders/default.nix | 10 +++++++---
 1 file changed, 7 insertions(+), 3 deletions(-)

diff --git a/pkgs/build-support/trivial-builders/default.nix b/pkgs/build-support/trivial-builders/default.nix
index e90d0a6d2022..d3cb22a1f535 100644
--- a/pkgs/build-support/trivial-builders/default.nix
+++ b/pkgs/build-support/trivial-builders/default.nix
@@ -135,9 +135,15 @@ rec {
     , allowSubstitutes ? false
     , preferLocalBuild ? true
     }:
+    let
+      matches = builtins.match "/bin/([^/]+)" destination;
+    in
     runCommand name
-      { inherit text executable checkPhase meta allowSubstitutes preferLocalBuild;
+      { inherit text executable checkPhase allowSubstitutes preferLocalBuild;
         passAsFile = [ "text" ];
+        meta = lib.optionalAttrs (executable && matches != null) {
+          mainProgram = lib.head matches;
+        } // meta;
       }
       ''
         target=$out${lib.escapeShellArg destination}
@@ -350,8 +356,6 @@ rec {
           runHook postCheck
         ''
         else checkPhase;
-
-      meta.mainProgram = name;
     };
 
   # Create a C binary