[rubygems/rubygems] User bundler UA when downloading gems

Gem::RemoteFetcher uses Gem::Request, which adds the RubyGems UA.
Gem::RemoteFetcher is used to download gems, as well as the full index.
We would like the bundler UA to be used whenever bundler is making
requests.

This PR also avoids unsafely mutating the headers hash on the shared
`Gem::RemoteFetcher.fetcher` instance, which could cause corruption or
incorrect headers when making parallel requests. Instead, we create one
remote fetcher per rubygems remote, which is similar to the connection
segregation bundler is already doing

https://github.com/rubygems/rubygems/commit/f0e8dacdec

1 files changed, 2 insertions, 1 deletions

diff --git a/spec/bundler/bundler/fetcher/index_spec.rb b/spec/bundler/bundler/fetcher/index_spec.rb
index 971b64ce8f..f3cdc235ba 100644
--- a/spec/bundler/bundler/fetcher/index_spec.rb
+++ b/spec/bundler/bundler/fetcher/index_spec.rb
@@ -8,8 +8,9 @@ RSpec.describe Bundler::Fetcher::Index do
   let(:display_uri) { "http://sample_uri.com" }
   let(:rubygems)    { double(:rubygems) }
   let(:gem_names)   { %w[foo bar] }
+  let(:gem_remote_fetcher) { nil }
 
-  subject { described_class.new(downloader, remote, display_uri) }
+  subject { described_class.new(downloader, remote, display_uri, gem_remote_fetcher) }
 
   before { allow(Bundler).to receive(:rubygems).and_return(rubygems) }