From 3c78d5cf914aeb57e734cca7b0bff5ee59fd9802 Mon Sep 17 00:00:00 2001
From: Chris Thachuk <cthachuk@cs.ubc.ca>
Date: Wed, 7 Apr 2010 14:54:30 -0700
Subject: [PATCH] Adds support for git submodules.  Fixes
 Homebrew/homebrew#1009.

If submodules exists for a git repo then checkout their index as well
into the appropriate path.

Signed-off-by: Adam Vandenberg <flangy@gmail.com>
---
 Library/Homebrew/download_strategy.rb | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/Library/Homebrew/download_strategy.rb b/Library/Homebrew/download_strategy.rb
index 0305bf944f..5f1a1a2d37 100644
--- a/Library/Homebrew/download_strategy.rb
+++ b/Library/Homebrew/download_strategy.rb
@@ -172,6 +172,13 @@ class GitDownloadStrategy <AbstractDownloadStrategy
       end
       # http://stackoverflow.com/questions/160608/how-to-do-a-git-export-like-svn-export
       safe_system 'git', 'checkout-index', '-a', '-f', "--prefix=#{dst}/"
+      # check for submodules
+      if File.exist?('.gitmodules')
+        safe_system 'git', 'submodule', 'init'
+        safe_system 'git', 'submodule', 'update'
+        sub_cmd = "git checkout-index -a -f --prefix=#{dst}/$path/"
+        safe_system 'git', 'submodule', '--quiet', 'foreach', '--recursive', sub_cmd
+      end
     end
   end
 end