Replace `with_rubygems` script

Instead, use a better rubygems version manager that makes sure that
`ENV["RGV"]` usage is always applied, and its usage is centralized at a
single place.

This simplifies the rake task organization and makes it much simpler to
run locally exactly what's run in CI. For example, since it doesn't rely
on the `RGV` being deleted for subsequent subprocesses, it also running
`bin/rake spec:travis` task locally which previously would lead to

```
rake aborted!

RubyGems version is required on Travis!
```

It also reduces duplication making it so that we only need to change the
`.travis.yml` file when updating tested rubies, and not the `Rakefile`
as well.

6 files changed, 0 insertions, 55 deletions

diff --git a/bin/parallel_rspec b/bin/parallel_rspec
index 9783533198..c6fb33d583 100755
--- a/bin/parallel_rspec
+++ b/bin/parallel_rspec
@@ -1,8 +1,6 @@
 #!/usr/bin/env ruby
 # frozen_string_literal: true
 
-load File.expand_path("../with_rubygems", __FILE__) if ENV["RGV"]
-
 require_relative "../spec/support/rubygems_ext"
 
 Spec::Rubygems.gem_load("parallel_tests", "parallel_rspec")
diff --git a/bin/rake b/bin/rake
index 2fb69d19f3..6a443ab2d9 100755
--- a/bin/rake
+++ b/bin/rake
@@ -1,8 +1,6 @@
 #!/usr/bin/env ruby
 # frozen_string_literal: true
 
-load File.expand_path("../with_rubygems", __FILE__) if ENV["RGV"]
-
 require_relative "../spec/support/rubygems_ext"
 
 Spec::Rubygems.gem_load("rake", "rake")
diff --git a/bin/ronn b/bin/ronn
index e47fb518a4..d7084e307e 100755
--- a/bin/ronn
+++ b/bin/ronn
@@ -1,8 +1,6 @@
 #!/usr/bin/env ruby
 # frozen_string_literal: true
 
-load File.expand_path("../with_rubygems", __FILE__) if ENV["RGV"]
-
 require_relative "../spec/support/rubygems_ext"
 
 Spec::Rubygems.gem_load("ronn", "ronn")
diff --git a/bin/rspec b/bin/rspec
index 4c139156f9..250b9cfb54 100755
--- a/bin/rspec
+++ b/bin/rspec
@@ -1,8 +1,6 @@
 #!/usr/bin/env ruby
 # frozen_string_literal: true
 
-load File.expand_path("../with_rubygems", __FILE__) if ENV["RGV"]
-
 require_relative "../spec/support/rubygems_ext"
 
 Spec::Rubygems.gem_load("rspec-core", "rspec")
diff --git a/bin/rubocop b/bin/rubocop
index 818aaf7a9d..3716bffe31 100755
--- a/bin/rubocop
+++ b/bin/rubocop
@@ -1,8 +1,6 @@
 #!/usr/bin/env ruby
 # frozen_string_literal: true
 
-load File.expand_path("../with_rubygems", __FILE__) if ENV["RGV"]
-
 require_relative "../spec/support/rubygems_ext"
 
 Spec::Rubygems.gem_load("rubocop", "rubocop")
diff --git a/bin/with_rubygems b/bin/with_rubygems
deleted file mode 100755
index 59365e40ce..0000000000
--- a/bin/with_rubygems
+++ /dev/null
@@ -1,45 +0,0 @@
-#!/usr/bin/env ruby
-# frozen_string_literal: true
-
-require "pathname"
-require_relative "../spec/support/helpers"
-
-class RubygemsVersionManager
-  include Spec::Helpers
-end
-
-rubygems_version_manager = RubygemsVersionManager.new
-
-version = ENV.delete("RGV")
-rubygems_path = Pathname.new(version).expand_path
-unless rubygems_path.directory?
-  rubygems_path = Pathname.new("tmp/rubygems").expand_path
-  unless rubygems_path.directory?
-    rubygems_path.parent.mkpath
-    rubygems_version_manager.sys_exec!("git clone https://github.com/rubygems/rubygems.git #{rubygems_path}")
-  end
-  Dir.chdir(rubygems_path) do
-    rubygems_version_manager.sys_exec!("git remote update")
-    version = "v#{version}" if version =~ /\A\d/
-    rubygems_version_manager.sys_exec!("git checkout #{version} --quiet")
-  end
-end
-
-rubygems_lib = rubygems_path + "lib"
-ENV["RUBYOPT"] = %(-I#{rubygems_lib} #{ENV["RUBYOPT"]})
-
-if $0 != __FILE__
-  ARGV.unshift($0)
-elsif cmd = ARGV.first
-  possible_dirs = [
-    Pathname.new(__FILE__) + "..",
-    Pathname.new(__FILE__) + "../../exe",
-    rubygems_path + "bin",
-  ]
-  cmd = possible_dirs.map do |dir|
-    dir.join(cmd).expand_path
-  end.find(&:file?)
-  ARGV[0] = cmd.to_s if cmd
-end
-
-exec(*ARGV)