Golang FindCgroupMountpoint Examples

Example #1

File: runtime.go Project: jpellerin/docker

// FIXME: comment please!
func (runtime *Runtime) UpdateCapabilities(quiet bool) {
	if cgroupMemoryMountpoint, err := utils.FindCgroupMountpoint("memory"); err != nil {
		if !quiet {
			log.Printf("WARNING: %s\n", err)
		}
	} else {
		_, err1 := ioutil.ReadFile(path.Join(cgroupMemoryMountpoint, "memory.limit_in_bytes"))
		_, err2 := ioutil.ReadFile(path.Join(cgroupMemoryMountpoint, "memory.soft_limit_in_bytes"))
		runtime.capabilities.MemoryLimit = err1 == nil && err2 == nil
		if !runtime.capabilities.MemoryLimit && !quiet {
			log.Printf("WARNING: Your kernel does not support cgroup memory limit.")
		}

		_, err = ioutil.ReadFile(path.Join(cgroupMemoryMountpoint, "memory.memsw.limit_in_bytes"))
		runtime.capabilities.SwapLimit = err == nil
		if !runtime.capabilities.SwapLimit && !quiet {
			log.Printf("WARNING: Your kernel does not support cgroup swap limit.")
		}
	}

	content, err3 := ioutil.ReadFile("/proc/sys/net/ipv4/ip_forward")
	runtime.capabilities.IPv4ForwardingDisabled = err3 != nil || len(content) == 0 || content[0] != '1'
	if runtime.capabilities.IPv4ForwardingDisabled && !quiet {
		log.Printf("WARNING: IPv4 forwarding is disabled.")
	}

	// Check if AppArmor seems to be enabled on this system.
	if _, err := os.Stat("/sys/kernel/security/apparmor"); os.IsNotExist(err) {
		utils.Debugf("/sys/kernel/security/apparmor not found; assuming AppArmor is not enabled.")
		runtime.capabilities.AppArmor = false
	} else {
		utils.Debugf("/sys/kernel/security/apparmor found; assuming AppArmor is enabled.")
		runtime.capabilities.AppArmor = true
	}
}

Example #2

File: runtime.go Project: shykes/docker

// FIXME: comment please!
func (runtime *Runtime) UpdateCapabilities(quiet bool) {
	if cgroupMemoryMountpoint, err := utils.FindCgroupMountpoint("memory"); err != nil {
		if !quiet {
			log.Printf("WARNING: %s\n", err)
		}
	} else {
		_, err1 := ioutil.ReadFile(path.Join(cgroupMemoryMountpoint, "memory.limit_in_bytes"))
		_, err2 := ioutil.ReadFile(path.Join(cgroupMemoryMountpoint, "memory.soft_limit_in_bytes"))
		runtime.capabilities.MemoryLimit = err1 == nil && err2 == nil
		if !runtime.capabilities.MemoryLimit && !quiet {
			log.Printf("WARNING: Your kernel does not support cgroup memory limit.")
		}

		_, err = ioutil.ReadFile(path.Join(cgroupMemoryMountpoint, "memory.memsw.limit_in_bytes"))
		runtime.capabilities.SwapLimit = err == nil
		if !runtime.capabilities.SwapLimit && !quiet {
			log.Printf("WARNING: Your kernel does not support cgroup swap limit.")
		}
	}

	content, err3 := ioutil.ReadFile("/proc/sys/net/ipv4/ip_forward")
	runtime.capabilities.IPv4ForwardingDisabled = err3 != nil || len(content) == 0 || content[0] != '1'
	if runtime.capabilities.IPv4ForwardingDisabled && !quiet {
		log.Printf("WARNING: IPv4 forwarding is disabled.")
	}
}

Example #3

File: runtime.go Project: rif/golang-stuff

func (runtime *Runtime) UpdateCapabilities(quiet bool) {
	if cgroupMemoryMountpoint, err := utils.FindCgroupMountpoint("memory"); err != nil {
		if !quiet {
			log.Printf("WARNING: %s\n", err)
		}
	} else {
		_, err1 := ioutil.ReadFile(path.Join(cgroupMemoryMountpoint, "memory.limit_in_bytes"))
		_, err2 := ioutil.ReadFile(path.Join(cgroupMemoryMountpoint, "memory.soft_limit_in_bytes"))
		runtime.capabilities.MemoryLimit = err1 == nil && err2 == nil
		if !runtime.capabilities.MemoryLimit && !quiet {
			log.Printf("WARNING: Your kernel does not support cgroup memory limit.")
		}

		_, err = ioutil.ReadFile(path.Join(cgroupMemoryMountpoint, "memory.memsw.limit_in_bytes"))
		runtime.capabilities.SwapLimit = err == nil
		if !runtime.capabilities.SwapLimit && !quiet {
			log.Printf("WARNING: Your kernel does not support cgroup swap limit.")
		}
	}
}