rubocop Exclude relative path bug

.rubocop-todo.yml

Lint/EndAlignment:
  Exclude:
    - 'rel/path/broken.rb'

.rubocop.yml

inherit_from:
  - .rubocop-todo.yml

Documentation:
  Enabled: false

README.md

The rubocop documentation states "Files and directories are specified relative to the .rubocop.yml file.", however that seems to be untrue based on from where you run rubocop from! Oh no!

To demonstrate the breakage, clone this gist and move the broken.rb to a subdirectory:

mkdir -p rel/path
mv broken.rb rel/path

From there, you can confirm that relative paths work from the same directory as .rubocop.yml:

bundle
bundle exec rubocop rel/path/broken.rb

All good! 1 files inspected, no offenses detected But if I rely on the behavior for rubocop to go upwards to find the .rubocop.yml (which it does) it loses the Excludes configuration.

bundle exec rubocop broken.rb
Inspecting 1 file
W

Offenses:

broken.rb:8:7: W: end at 8, 6 is not aligned with if at 4, 4.
      end
      ^^^

1 file inspected, 1 offense detected

broken.rb

class Broken
  def foo
    # I'm intentionally broken
    if 1 == 0
      puts "This isn't real code."
    else
      puts "For really real, it isn't"
      end
  end
end

Gemfile

source 'https://rubygems.org'

gem 'rubocop'