[rubygems/rubygems] Copy template contents instead of file and perms

This allows the file to be created without copying permissions
from Bundler's installation source. The previous behaviour was
noticed after installing Ruby through brew, and using bundle
init, which yielded a read-only Gemfile.

https://github.com/rubygems/rubygems/commit/839a06851d

1 files changed, 23 insertions, 0 deletions

diff --git a/spec/bundler/commands/init_spec.rb b/spec/bundler/commands/init_spec.rb
index eaf8fa170a..9c499b99a1 100644
--- a/spec/bundler/commands/init_spec.rb
+++ b/spec/bundler/commands/init_spec.rb
@@ -7,6 +7,29 @@ RSpec.describe "bundle init" do
     expect(bundled_app_gemfile).to be_file
   end
 
+  context "with a template with permission flags not matching current process umask" do
+    let(:template_file) do
+      gemfile = Bundler.preferred_gemfile_name
+      templates_dir.join(gemfile)
+    end
+
+    let(:target_dir) { bundled_app("init_permissions_test") }
+
+    around do |example|
+      old_chmod = File.stat(template_file).mode
+      FileUtils.chmod(old_chmod | 0o111, template_file) # chmod +x
+      example.run
+      FileUtils.chmod(old_chmod, template_file)
+    end
+
+    it "honours the current process umask when generating from a template" do
+      FileUtils.mkdir(target_dir)
+      bundle :init, :dir => target_dir
+      generated_mode = File.stat(File.join(target_dir, "Gemfile")).mode & 0o111
+      expect(generated_mode).to be_zero
+    end
+  end
+
   context "when a Gemfile already exists" do
     before do
       create_file "Gemfile", <<-G