From f60b221629b72265f04fd3ede48ce052bbedc18d Mon Sep 17 00:00:00 2001
From: Robert Scott <code@humanleg.org.uk>
Date: Sat, 20 Jul 2019 01:21:16 +0100
Subject: [PATCH] blockbook: increase ulimit -n on darwin for packr execution

macos default can cause build failures due to too many open files
---
 pkgs/servers/blockbook/default.nix | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/pkgs/servers/blockbook/default.nix b/pkgs/servers/blockbook/default.nix
index 6a1d8a75cc1..b95c3d41b39 100644
--- a/pkgs/servers/blockbook/default.nix
+++ b/pkgs/servers/blockbook/default.nix
@@ -1,4 +1,5 @@
-{ buildGoPackage
+{ stdenv
+, buildGoPackage
 , lib
 , fetchFromGitHub
 , rocksdb
@@ -30,7 +31,9 @@ buildGoPackage rec {
 
   nativeBuildInputs = [ pkg-config packr ];
 
-  preBuild = ''
+  preBuild = lib.optionalString stdenv.isDarwin ''
+    ulimit -n 8192
+  '' + ''
     export CGO_CFLAGS="-I${rocksdb}/include"
     export CGO_LDFLAGS="-L${rocksdb}/lib -lrocksdb -lstdc++ -lm -lz -lbz2 -lsnappy -llz4"
     packr clean && packr