func ProcessCgroupPaths()

in cgroup/util.go [230:263]

• 25 lines of code
• 6 McCabe index (conditional complexity)

func ProcessCgroupPaths(rootfsMountpoint string, pid int) (map[string]string, error) {
	if rootfsMountpoint == "" {
		rootfsMountpoint = "/"
	}

	cgroup, err := os.Open(filepath.Join(rootfsMountpoint, "proc", strconv.Itoa(pid), "cgroup"))
	if err != nil {
		return nil, err
	}
	defer cgroup.Close()

	paths := map[string]string{}
	sc := bufio.NewScanner(cgroup)
	for sc.Scan() {
		// http://man7.org/linux/man-pages/man7/cgroups.7.html
		// Format: hierarchy-ID:subsystem-list:cgroup-path
		// Example:
		// 2:cpu:/docker/b29faf21b7eff959f64b4192c34d5d67a707fe8561e9eaa608cb27693fba4242
		line := sc.Text()

		fields := strings.Split(line, ":")
		if len(fields) != 3 {
			continue
		}

		path := fields[2]
		subsystems := strings.Split(fields[1], ",")
		for _, subsystem := range subsystems {
			paths[subsystem] = path
		}
	}

	return paths, sc.Err()
}