Ignore paths like GEM_HOME that are empty strings

2 files changed, 15 insertions, 2 deletions

diff --git a/lib/bundler.rb b/lib/bundler.rb
index 2eb9f913f3..06512df96a 100644
--- a/lib/bundler.rb
+++ b/lib/bundler.rb
@@ -118,8 +118,8 @@ module Bundler
         ENV['GEM_HOME'] = File.expand_path(bundle_path, root)
         ENV['GEM_PATH'] = ''
       else
-        gem_home, gem_path = Gem.dir, Gem.path
-        ENV["GEM_PATH"] = [gem_home, gem_path].flatten.compact.join(File::PATH_SEPARATOR)
+        paths = [Gem.dir, Gem.path].flatten.compact.reject{|p| p.empty? }
+        ENV["GEM_PATH"] = paths.join(File::PATH_SEPARATOR)
         ENV["GEM_HOME"] = bundle_path.to_s
       end
 
diff --git a/spec/runtime/setup_spec.rb b/spec/runtime/setup_spec.rb
index e91579852c..ac34f621b9 100644
--- a/spec/runtime/setup_spec.rb
+++ b/spec/runtime/setup_spec.rb
@@ -173,4 +173,17 @@ describe "Bundler.setup" do
 
     out.should be_empty
   end
+
+  it "ignores empty gem paths" do
+    install_gemfile <<-G
+      source "file://#{gem_repo1}"
+      gem "rack"
+    G
+
+    ENV["GEM_HOME"] = ""
+    bundle %{exec ruby -e "require 'set'"}
+
+    err.should be_empty
+  end
+
 end