From 7a5b85cdda7d619ec81de124e601e2333084dce4 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Domen=20Ko=C5=BEar?= <domen@dev.si>
Date: Sun, 29 May 2016 14:25:09 +0100
Subject: [PATCH] pkgs.runCommand: passAsFile (buildCommand can be very long)
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Close #15803. This avoids the error:

while setting up the build environment: executing
‘/nix/store/7sb42axk5lrxqz45nldrb2pchlys14s1-bash-4.3-p42/bin/bash’:
Argument list too long

Note: I wanted to make it optional based on buildCommand length,
but that seems pointless as I'm sure it's less performant.

Amended by vcunat:
https://github.com/NixOS/nixpkgs/pull/15803#issuecomment-224841225
---
 pkgs/build-support/trivial-builders.nix | 1 +
 pkgs/stdenv/generic/setup.sh            | 4 ++++
 2 files changed, 5 insertions(+)

diff --git a/pkgs/build-support/trivial-builders.nix b/pkgs/build-support/trivial-builders.nix
index 73f4d7783c4..18e49105ae7 100644
--- a/pkgs/build-support/trivial-builders.nix
+++ b/pkgs/build-support/trivial-builders.nix
@@ -8,6 +8,7 @@ rec {
   runCommand = name: env: buildCommand:
     stdenv.mkDerivation ({
       inherit name buildCommand;
+      passAsFile = [ "buildCommand" ];
     } // env);
 
 
diff --git a/pkgs/stdenv/generic/setup.sh b/pkgs/stdenv/generic/setup.sh
index 85e74461d2a..5b50167d9b9 100644
--- a/pkgs/stdenv/generic/setup.sh
+++ b/pkgs/stdenv/generic/setup.sh
@@ -827,6 +827,10 @@ showPhaseHeader() {
 
 
 genericBuild() {
+    if [ -f "$buildCommandPath" ]; then
+        . "$buildCommandPath"
+        return
+    fi
     if [ -n "$buildCommand" ]; then
         eval "$buildCommand"
         return