https://github.com/schacon/ruby-git/issues/136 -> Workaround code

workaround.rb

require 'git'

g = Git.open(working_dir)
untracked_files = gitstatus_untracked_workaround(g)

def gitstatus_untracked_workaround(g)
  gem_rubygit_buggy_untracked_files = g.status.untracked.keys
  git_files = `git --work-tree=#{g.dir} --git-dir=#{g.dir}/.git ls-files -z -d -m -o -X .gitignore`.split("\x0")
  gem_rubygit_buggy_untracked_files & git_files
end