From a6485cfcdf51ff8be452980f93cebfea97f34dec Mon Sep 17 00:00:00 2001
From: zimbatm <zimbatm@zimbatm.com>
Date: Wed, 21 Sep 2016 09:32:34 +0100
Subject: [PATCH 1/3] add post-extract hook

Allows nix to execute scripts just after the gem extraction
---
 lib/rubygems/installer.rb | 10 +++++++++-
 1 file changed, 9 insertions(+), 1 deletion(-)

diff --git a/lib/rubygems/installer.rb b/lib/rubygems/installer.rb
index d26b1e88..bf18fb7f 100644
--- a/lib/rubygems/installer.rb
+++ b/lib/rubygems/installer.rb
@@ -848,7 +848,15 @@ TEXT
   # Ensures that files can't be installed outside the gem directory.
 
   def extract_files
-    @package.extract_files gem_dir
+    ret = @package.extract_files gem_dir
+    if ENV['NIX_POST_EXTRACT_FILES_HOOK']
+      puts
+      puts "running NIX_POST_EXTRACT_FILES_HOOK #{ENV['NIX_POST_EXTRACT_FILES_HOOK']} #{gem_dir}"
+      system(ENV['NIX_POST_EXTRACT_FILES_HOOK'], gem_dir.to_s)
+      puts "running NIX_POST_EXTRACT_FILES_HOOK done"
+      puts
+    end
+    ret
   end
 
   ##
-- 
2.21.0