only_if do
IO.popen(["squidclient", "--host=127.0.0.1", "--port=3128", "mgr:counters"]) do |io|
io.each.grep(/^[a-z][a-z_.]+ = -[0-9]+$/).count.positive?
only_if do
IO.popen(["squidclient", "--host=127.0.0.1", "--port=3128", "mgr:counters"]) do |io|
io.each.grep(/^[a-z][a-z_.]+ = -[0-9]+$/).count.positive?