package cgroups import ( "bufio" "fmt" "github.com/dotcloud/docker/pkg/mount" "io" "os" "strings" ) // https://www.kernel.org/doc/Documentation/cgroups/cgroups.txt func FindCgroupMountpoint(subsystem string) (string, error) { mounts, err := mount.GetMounts() if err != nil { return "", err } for _, mount := range mounts { if mount.Fstype == "cgroup" { for _, opt := range strings.Split(mount.VfsOpts, ",") { if opt == subsystem { return mount.Mountpoint, nil } } } } return "", fmt.Errorf("cgroup mountpoint not found for %s", subsystem) } // Returns the relative path to the cgroup docker is running in. func GetThisCgroupDir(subsystem string) (string, error) { f, err := os.Open("/proc/self/cgroup") if err != nil { return "", err } defer f.Close() return parseCgroupFile(subsystem, f) } func parseCgroupFile(subsystem string, r io.Reader) (string, error) { s := bufio.NewScanner(r) for s.Scan() { if err := s.Err(); err != nil { return "", err } text := s.Text() parts := strings.Split(text, ":") if parts[1] == subsystem { return parts[2], nil } } return "", fmt.Errorf("cgroup '%s' not found in /proc/self/cgroup", subsystem) }