1 files changed, 28 insertions, 0 deletions
diff --git a/lib/rubygems/source/installed.rb b/lib/rubygems/source/installed.rb
new file mode 100644
index 0000000000..7709778791
--- /dev/null
+++ b/lib/rubygems/source/installed.rb
@@ -0,0 +1,28 @@
+class Gem::Source::Installed < Gem::Source
+
+  def initialize
+  end
+
+  ##
+  # Installed sources sort before all other sources
+
+  def <=> other
+    case other
+    when Gem::Source::Installed then
+      0
+    when Gem::Source then
+      1
+    else
+      nil
+    end
+  end
+
+  ##
+  # We don't need to download an installed gem
+
+  def download spec, path
+    nil
+  end
+
+end
+