Unlock specs that don't exist in the path source anymore

lib/bundler/definition.rb

@@ -203,6 +203,9 @@ def converge_locked_specs
         s.source = @sources.find { |src| s.source == src }
 
         next if s.source.nil? || @unlock[:sources].include?(s.name)
+        # If the spec is from a path source and it doesn't exist anymore
+        # then we just unlock it.
+        next if s.source.instance_of?(Source::Path) && s.source.specs[s].empty?
 
         converged << s
       end

lib/bundler/index.rb

@@ -1,5 +1,7 @@
 module Bundler
   class Index
+    include Enumerable
+
     def self.build
       i = new
       yield i
@@ -79,6 +81,12 @@ def use(other)
       self
     end
 
+    def ==(o)
+      all? do |s|
+        s2 = o[s].first and (s.dependencies & s2.dependencies).empty?
+      end
+    end
+
   private
 
     def search_by_spec(spec)

spec/install/path_spec.rb

@@ -171,4 +171,35 @@
     bundle "exec foo"
     out.should == "1.0"
   end
+
+  describe "when the gem version in the path is updated" do
+    before :each do
+      build_lib "foo", "1.0", :path => lib_path("foo") do |s|
+        s.add_dependency "bar"
+      end
+      build_lib "bar", "1.0", :path => lib_path("foo/bar")
+
+      install_gemfile <<-G
+        gem "foo", :path => "#{lib_path('foo')}"
+      G
+    end
+
+    it "unlocks all gems when the top level gem is updated" do
+      build_lib "foo", "2.0", :path => lib_path("foo") do |s|
+        s.add_dependency "bar"
+      end
+
+      bundle "install"
+
+      should_be_installed "foo 2.0", "bar 1.0"
+    end
+
+    it "unlocks all gems when a child dependency gem is updated" do
+      build_lib "bar", "2.0", :path => lib_path("foo/bar")
+
+      bundle "install"
+
+      should_be_installed "foo 1.0", "bar 2.0"
+    end
+  end
 end