1 files changed, 20 insertions, 1 deletions
diff --git a/lib/rubygems/resolver/best_set.rb b/lib/rubygems/resolver/best_set.rb
index fa6c9f84c0..20bb94827b 100644
--- a/lib/rubygems/resolver/best_set.rb
+++ b/lib/rubygems/resolver/best_set.rb
@@ -12,11 +12,30 @@ class Gem::Resolver::BestSet < Gem::Resolver::ComposedSet
   def initialize sources = Gem.sources
     super()
 
-    sources.each_source do |source|
+    @sources = sources
+  end
+
+  ##
+  # Picks which sets to use for the configured sources.
+
+  def pick_sets # :nodoc:
+    @sources.each_source do |source|
       @sets << source.dependency_resolver_set
     end
   end
 
+  def find_all req # :nodoc:
+    pick_sets if @remote and @sets.empty?
+
+    super
+  end
+
+  def prefetch reqs # :nodoc:
+    pick_sets if @remote and @sets.empty?
+
+    super
+  end
+
   def pretty_print q # :nodoc:
     q.group 2, '[BestSet', ']' do
       q.breakable