Let users generate gemfiles in paths whos parent path contains a Gemfile

lib/bundler/cli/init.rb

@@ -36,11 +36,7 @@ def run
   private
 
     def gemfile
-      @gemfile ||= begin
-        Bundler.default_gemfile
-      rescue GemfileNotFound
-        Bundler.feature_flag.init_gems_rb? ? "gems.rb" : "Gemfile"
-      end
+      @gemfile ||= Bundler.feature_flag.init_gems_rb? ? "gems.rb" : "Gemfile"
     end
   end
 end

spec/commands/init_spec.rb

@@ -15,18 +15,35 @@
 
   context "when a Gemfile already exists" do
     before do
-      gemfile <<-G
+      create_file "gems.rb", <<-G
         gem "rails"
       G
     end
 
     it "does not change existing Gemfiles" do
-      expect { bundle :init }.not_to change { File.read(bundled_app("Gemfile")) }
+      expect { bundle :init }.not_to change { File.read(bundled_app("gems.rb")) }
     end
 
     it "notifies the user that an existing Gemfile already exists" do
       bundle :init
-      expect(out).to include("Gemfile already exists")
+      expect(out).to include("gems.rb already exists")
+    end
+  end
+
+  context "when a Gemfile exists in a parent directory" do
+    let(:subdir) { "child_dir" }
+
+    it "lets users generate a Gemfile in a child directory" do
+      bundle! :init
+
+      FileUtils.mkdir bundled_app(subdir)
+
+      Dir.chdir bundled_app(subdir) do
+        bundle! :init
+      end
+
+      expect(out).to include("Writing new gems.rb")
+      expect(bundled_app("#{subdir}/gems.rb")).to be_file
     end
   end