class << self

parameter　cgroup_root　String

The root of the cgroup v2 filesystem.

parameter　cgroup_path　String

The process cgroup membership file.

returns　Float | Nil

The smallest finite quota in the cgroup hierarchy, if available.

def quota(cgroup_root: DEFAULT_CGROUP_ROOT, cgroup_path: DEFAULT_CGROUP_PATH)
	unless relative_path = current_path(cgroup_path)
		return nil
	end
	
	root = File.expand_path(cgroup_root)
	directory = File.expand_path(relative_path.delete_prefix("/"), root)
	return nil unless directory == root || directory.start_with?("#{root}/")
	
	quota = nil
	
	loop do
		if current = read_quota(directory)
			quota = [quota, current].compact.min
		end
		
		break if directory == root
		directory = File.dirname(directory)
	end
	
	return quota
rescue Errno::EACCES, Errno::EINVAL, Errno::ENOENT, Errno::ENOTDIR, ArgumentError
	return nil
end