Allowing git local override to to accept :branch, :tag or :ref

lib/bundler/source.rb

@@ -716,9 +716,9 @@ def local_override!(path)
         path = Pathname.new(path)
         path = path.expand_path(Bundler.root) unless path.relative?
 
-        unless options["branch"]
+        unless options["branch"] || options["tag"] || options["ref"]
           raise GitError, "Cannot use local override for #{name} at #{path} because " \
-            ":branch is not specified in Gemfile. Specify a branch or check " \
+            ":branch, :tag, or :ref is not specified in Gemfile. Specify a commit reference or check " \
             "`bundle config --delete` to remove the local override"
         end
 
@@ -733,11 +733,6 @@ def local_override!(path)
         # so the Gemfile.lock always picks up the new revision.
         @git_proxy = GitProxy.new(path, uri, ref)
 
-        if git_proxy.branch != options["branch"]
-          raise GitError, "Local override for #{name} at #{path} is using branch " \
-            "#{git_proxy.branch} but Gemfile specifies #{options["branch"]}"
-        end
-
         changed = cached_revision && cached_revision != git_proxy.revision
 
         if changed && !git_proxy.contains?(cached_revision)

spec/install/git_spec.rb

@@ -254,7 +254,7 @@
       out.should =~ /Cannot use local override for rack-0.8 because #{Regexp.escape(lib_path('local-rack').to_s)} does not exist/
     end
 
-    it "explodes if branch is not given" do
+    it "explodes if branch, tag, or ref is not given" do
       build_git "rack", "0.8"
       FileUtils.cp_r("#{lib_path('rack-0.8')}/.", lib_path('local-rack'))
 
@@ -265,26 +265,7 @@
 
       bundle %|config local.rack #{lib_path('local-rack')}|
       bundle :install
-      out.should =~ /because :branch is not specified in Gemfile/
-    end
-
-    it "explodes on different branches" do
-      build_git "rack", "0.8"
-
-      FileUtils.cp_r("#{lib_path('rack-0.8')}/.", lib_path('local-rack'))
-
-      update_git "rack", "0.8", :path => lib_path('local-rack'), :branch => "another" do |s|
-        s.write "lib/rack.rb", "puts :LOCAL"
-      end
-
-      install_gemfile <<-G
-        source "file://#{gem_repo1}"
-        gem "rack", :git => "#{lib_path('rack-0.8')}", :branch => "master"
-      G
-
-      bundle %|config local.rack #{lib_path('local-rack')}|
-      bundle :install
-      out.should =~ /is using branch another but Gemfile specifies master/
+      out.should =~ /because :branch, :tag, or :ref is not specified in Gemfile/
     end
 
     it "explodes on invalid revision" do