Looking for a more sexy ruby way

gistfile1.rb

def do_work(action, repo, rev)
  failures = []
  trac_projs = trac_proj_paths
  trac_projs.each do |tp|
    success = trac_admin_success?(tp, action, repo, rev)
    failures << tp unless success
  end
  do_failures(failures, action, repo, rev) unless failures.empty?
end

def trac_admin_success?(trac_proj, action, repo, rev)
  system("echo '#{TRAC_ADMIN} #{trac_proj} changeset #{action} #{repo} #{rev}'")
end

def do_failures(failures, action, repo, rev, count=0)
  if count == 4
    # TODO log error
    return
  end
  sleep 5
  failures.each do |f|
    success = trac_admin_success?(f, action, repo, rev)
    failures.delete(f) if success
  end
  count += 1
  do_failures(failures, action, repo, rev, count) unless failures.empty?
end