Allow running gem tasks inside paths with brackets

bundler/lib/bundler/gem_helper.rb

@@ -32,7 +32,7 @@ def gemspec(&block)
 
     def initialize(base = nil, name = nil)
       @base = File.expand_path(base || SharedHelpers.pwd)
-      gemspecs = name ? [File.join(@base, "#{name}.gemspec")] : Dir[File.join(@base, "{,*}.gemspec")]
+      gemspecs = name ? [File.join(@base, "#{name}.gemspec")] : Gem::Util.glob_files_in_dir("{,*}.gemspec", @base)
       raise "Unable to determine name from existing gemspec. Use :name => 'gemname' in #install_tasks to manually set it." unless gemspecs.size == 1
       @spec_path = gemspecs.first
       @gemspec = Bundler.load_gemspec(@spec_path)
@@ -111,7 +111,7 @@ def rubygem_push(path)
     end
 
     def built_gem_path
-      Dir[File.join(base, "#{name}-*.gem")].sort_by {|f| File.mtime(f) }.last
+      Gem::Util.glob_files_in_dir("#{name}-*.gem", base).sort_by {|f| File.mtime(f) }.last
     end
 
     def git_push(remote = nil)

bundler/lib/bundler/rubygems_ext.rb

@@ -173,6 +173,22 @@ def hash
     undef_method :eql? if method_defined? :eql?
     alias_method :eql?, :==
   end
+
+  require "rubygems/util"
+
+  Util.singleton_class.module_eval do
+    if Util.singleton_methods.include?(:glob_files_in_dir) # since 3.0.0.beta.2
+      remove_method :glob_files_in_dir
+    end
+
+    def glob_files_in_dir(glob, base_path)
+      if RUBY_VERSION >= "2.5"
+        Dir.glob(glob, :base => base_path).map! {|f| File.expand_path(f, base_path) }
+      else
+        Dir.glob(File.join(base_path.to_s.gsub(/[\[\]]/, '\\\\\\&'), glob)).map! {|f| File.expand_path(f) }
+      end
+    end
+  end
 end
 
 module Gem

bundler/spec/runtime/gem_tasks_spec.rb

@@ -67,6 +67,18 @@
     end
   end
 
+  context "rake build when path has brackets", :ruby_repo do
+    before do
+      bracketed_bundled_app = tmp.join("bundled[app")
+      FileUtils.cp_r bundled_app, bracketed_bundled_app
+      bundle "exec rake build", :dir => bracketed_bundled_app
+    end
+
+    it "still runs successfully" do
+      expect(err).to be_empty
+    end
+  end
+
   context "bundle path configured locally" do
     before do
       bundle "config set path vendor/bundle"