Fix using the gemspec DSL on a path with brackets in its name

bundler/lib/bundler/dsl.rb

@@ -63,7 +63,7 @@ def gemspec(opts = nil)
       development_group = opts[:development_group] || :development
       expanded_path     = gemfile_root.join(path)
 
-      gemspecs = Dir[File.join(expanded_path, "{,*}.gemspec")].map {|g| Bundler.load_gemspec(g) }.compact
+      gemspecs = Gem::Util.glob_files_in_dir("{,*}.gemspec", expanded_path).map {|g| Bundler.load_gemspec(g) }.compact
       gemspecs.reject! {|s| s.name != name } if name
       Index.sort_specs(gemspecs)
       specs_by_name_and_version = gemspecs.group_by {|s| [s.name, s.version] }

bundler/lib/bundler/source/path.rb

@@ -171,7 +171,7 @@ def load_spec_files
 
         if File.directory?(expanded_path)
           # We sort depth-first since `<<` will override the earlier-found specs
-          Dir["#{expanded_path}/#{@glob}"].sort_by {|p| -p.split(File::SEPARATOR).size }.each do |file|
+          Gem::Util.glob_files_in_dir(@glob, expanded_path).sort_by {|p| -p.split(File::SEPARATOR).size }.each do |file|
             next unless spec = load_gemspec(file)
             spec.source = self
 

bundler/spec/commands/install_spec.rb

@@ -511,7 +511,7 @@
   end
 
   describe "when Bundler root contains regex chars" do
-    it "doesn't blow up" do
+    it "doesn't blow up when using the `gem` DSL" do
       root_dir = tmp("foo[]bar")
 
       FileUtils.mkdir_p(root_dir)
@@ -526,6 +526,22 @@
 
       bundle :install, :dir => root_dir
     end
+
+    it "doesn't blow up when using the `gemspec` DSL" do
+      root_dir = tmp("foo[]bar")
+
+      FileUtils.mkdir_p(root_dir)
+
+      build_lib "foo", :path => root_dir
+      gemfile = <<-G
+        gemspec
+      G
+      File.open("#{root_dir}/Gemfile", "w") do |file|
+        file.puts gemfile
+      end
+
+      bundle :install, :dir => root_dir
+    end
   end
 
   describe "when requesting a quiet install via --quiet" do