configs

package
v0.0.0-...-d7099c8 Latest Latest
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 Go to latest Published: Oct 8, 2020 License: Apache-2.0 Imports: 10 Imported by: 0

Documentation

Index

Constants

View Source 
const (
	// EXT_COPYUP is a directive to copy up the contents of a directory when
	// a tmpfs is mounted over it.
	EXT_COPYUP = 1 << iota
)
View Source 
const (
	Wildcard = -1
)

Variables

View Source 
var (
	// DefaultSimpleDevices are devices that are to be both allowed and created.
	DefaultSimpleDevices = []*Device{

		{
			Path:        "/dev/null",
			Type:        'c',
			Major:       1,
			Minor:       3,
			Permissions: "rwm",
			FileMode:    0666,
		},
		{
			Path:        "/dev/zero",
			Type:        'c',
			Major:       1,
			Minor:       5,
			Permissions: "rwm",
			FileMode:    0666,
		},

		{
			Path:        "/dev/full",
			Type:        'c',
			Major:       1,
			Minor:       7,
			Permissions: "rwm",
			FileMode:    0666,
		},

		{
			Path:        "/dev/tty",
			Type:        'c',
			Major:       5,
			Minor:       0,
			Permissions: "rwm",
			FileMode:    0666,
		},

		{
			Path:        "/dev/urandom",
			Type:        'c',
			Major:       1,
			Minor:       9,
			Permissions: "rwm",
			FileMode:    0666,
		},
		{
			Path:        "/dev/random",
			Type:        'c',
			Major:       1,
			Minor:       8,
			Permissions: "rwm",
			FileMode:    0666,
		},
	}
	DefaultAllowedDevices = append([]*Device{

		{
			Type:        'c',
			Major:       Wildcard,
			Minor:       Wildcard,
			Permissions: "m",
		},
		{
			Type:        'b',
			Major:       Wildcard,
			Minor:       Wildcard,
			Permissions: "m",
		},

		{
			Path:        "/dev/console",
			Type:        'c',
			Major:       5,
			Minor:       1,
			Permissions: "rwm",
		},

		{
			Path:        "",
			Type:        'c',
			Major:       136,
			Minor:       Wildcard,
			Permissions: "rwm",
		},
		{
			Path:        "",
			Type:        'c',
			Major:       5,
			Minor:       2,
			Permissions: "rwm",
		},

		{
			Path:        "",
			Type:        'c',
			Major:       10,
			Minor:       200,
			Permissions: "rwm",
		},
	}, DefaultSimpleDevices...)
	DefaultAutoCreatedDevices = append([]*Device{}, DefaultSimpleDevices...)
)

Functions

func IsNamespaceSupported 

func IsNamespaceSupported(ns NamespaceType) bool

IsNamespaceSupported returns whether a namespace is available or not

func NsName 

func NsName(ns NamespaceType) string

NsName converts the namespace type to its filename

Types

type Action 

type Action int

Action is taken upon rule match in Seccomp 

const (
	Kill Action = iota + 1
	Errno
	Trap
	Allow
	Trace
)

type Arg 

type Arg struct {
	Index    uint     `json:"index"`
	Value    uint64   `json:"value"`
	ValueTwo uint64   `json:"value_two"`
	Op       Operator `json:"op"`
}

Arg is a rule to match a specific syscall argument in Seccomp

type Capabilities 

type Capabilities struct {
	// Bounding is the set of capabilities checked by the kernel.
	Bounding []string
	// Effective is the set of capabilities checked by the kernel.
	Effective []string
	// Inheritable is the capabilities preserved across execve.
	Inheritable []string
	// Permitted is the limiting superset for effective capabilities.
	Permitted []string
	// Ambient is the ambient set of capabilities that are kept.
	Ambient []string
}

type Cgroup 

type Cgroup struct {
	// Deprecated, use Path instead
	Name string `json:"name,omitempty"`

	// name of parent of cgroup or slice
	// Deprecated, use Path instead
	Parent string `json:"parent,omitempty"`

	// Path specifies the path to cgroups that are created and/or joined by the container.
	// The path is assumed to be relative to the host system cgroup mountpoint.
	Path string `json:"path"`

	// ScopePrefix describes prefix for the scope name
	ScopePrefix string `json:"scope_prefix"`

	// Paths represent the absolute cgroups paths to join.
	// This takes precedence over Path.
	Paths map[string]string

	// Resources contains various cgroups settings to apply
	*Resources
}

type Command 

type Command struct {
	Path    string         `json:"path"`
	Args    []string       `json:"args"`
	Env     []string       `json:"env"`
	Dir     string         `json:"dir"`
	Timeout *time.Duration `json:"timeout"`
}

func (Command) Run 

func (c Command) Run(s *specs.State) error

type CommandHook 

type CommandHook struct {
	Command
}

func NewCommandHook 

func NewCommandHook(cmd Command) CommandHook

NewCommandHook will execute the provided command when the hook is run.

type Config 

type Config struct {
	// NoPivotRoot will use MS_MOVE and a chroot to jail the process into the container's rootfs
	// This is a common option when the container is running in ramdisk
	NoPivotRoot bool `json:"no_pivot_root"`

	// ParentDeathSignal specifies the signal that is sent to the container's process in the case
	// that the parent process dies.
	ParentDeathSignal int `json:"parent_death_signal"`

	// Path to a directory containing the container's root filesystem.
	Rootfs string `json:"rootfs"`

	// Readonlyfs will remount the container's rootfs as readonly where only externally mounted
	// bind mounts are writtable.
	Readonlyfs bool `json:"readonlyfs"`

	// Specifies the mount propagation flags to be applied to /.
	RootPropagation int `json:"rootPropagation"`

	// Mounts specify additional source and destination paths that will be mounted inside the container's
	// rootfs and mount namespace if specified
	Mounts []*Mount `json:"mounts"`

	// The device nodes that should be automatically created within the container upon container start.  Note, make sure that the node is marked as allowed in the cgroup as well!
	Devices []*Device `json:"devices"`

	MountLabel string `json:"mount_label"`

	// Hostname optionally sets the container's hostname if provided
	Hostname string `json:"hostname"`

	// Namespaces specifies the container's namespaces that it should setup when cloning the init process
	// If a namespace is not provided that namespace is shared from the container's parent process
	Namespaces Namespaces `json:"namespaces"`

	// Capabilities specify the capabilities to keep when executing the process inside the container
	// All capabilities not specified will be dropped from the processes capability mask
	Capabilities *Capabilities `json:"capabilities"`

	// Networks specifies the container's network setup to be created
	Networks []*Network `json:"networks"`

	// Routes can be specified to create entries in the route table as the container is started
	Routes []*Route `json:"routes"`

	// Cgroups specifies specific cgroup settings for the various subsystems that the container is
	// placed into to limit the resources the container has available
	Cgroups *Cgroup `json:"cgroups"`

	// AppArmorProfile specifies the profile to apply to the process running in the container and is
	// change at the time the process is execed
	AppArmorProfile string `json:"apparmor_profile,omitempty"`

	// ProcessLabel specifies the label to apply to the process running in the container.  It is
	// commonly used by selinux
	ProcessLabel string `json:"process_label,omitempty"`

	// Rlimits specifies the resource limits, such as max open files, to set in the container
	// If Rlimits are not set, the container will inherit rlimits from the parent process
	Rlimits []Rlimit `json:"rlimits,omitempty"`

	// OomScoreAdj specifies the adjustment to be made by the kernel when calculating oom scores
	// for a process. Valid values are between the range [-1000, '1000'], where processes with
	// higher scores are preferred for being killed. If it is unset then we don't touch the current
	// value.
	// More information about kernel oom score calculation here: https://lwn.net/Articles/317814/
	OomScoreAdj *int `json:"oom_score_adj,omitempty"`

	// UidMappings is an array of User ID mappings for User Namespaces
	UidMappings []IDMap `json:"uid_mappings"`

	// GidMappings is an array of Group ID mappings for User Namespaces
	GidMappings []IDMap `json:"gid_mappings"`

	// MaskPaths specifies paths within the container's rootfs to mask over with a bind
	// mount pointing to /dev/null as to prevent reads of the file.
	MaskPaths []string `json:"mask_paths"`

	// ReadonlyPaths specifies paths within the container's rootfs to remount as read-only
	// so that these files prevent any writes.
	ReadonlyPaths []string `json:"readonly_paths"`

	// Sysctl is a map of properties and their values. It is the equivalent of using
	// sysctl -w my.property.name value in Linux.
	Sysctl map[string]string `json:"sysctl"`

	// Seccomp allows actions to be taken whenever a syscall is made within the container.
	// A number of rules are given, each having an action to be taken if a syscall matches it.
	// A default action to be taken if no rules match is also given.
	Seccomp *Seccomp `json:"seccomp"`

	// NoNewPrivileges controls whether processes in the container can gain additional privileges.
	NoNewPrivileges bool `json:"no_new_privileges,omitempty"`

	// Hooks are a collection of actions to perform at various container lifecycle events.
	// CommandHooks are serialized to JSON, but other hooks are not.
	Hooks *Hooks

	// Version is the version of opencontainer specification that is supported.
	Version string `json:"version"`

	// Labels are user defined metadata that is stored in the config and populated on the state
	Labels []string `json:"labels"`

	// NoNewKeyring will not allocated a new session keyring for the container.  It will use the
	// callers keyring in this case.
	NoNewKeyring bool `json:"no_new_keyring"`

	// IntelRdt specifies settings for Intel RDT group that the container is placed into
	// to limit the resources (e.g., L3 cache, memory bandwidth) the container has available
	IntelRdt *IntelRdt `json:"intel_rdt,omitempty"`

	// RootlessEUID is set when the runc was launched with non-zero EUID.
	// Note that RootlessEUID is set to false when launched with EUID=0 in userns.
	// When RootlessEUID is set, runc creates a new userns for the container.
	// (config.json needs to contain userns settings)
	RootlessEUID bool `json:"rootless_euid,omitempty"`

	// RootlessCgroups is set when unlikely to have the full access to cgroups.
	// When RootlessCgroups is set, cgroups errors are ignored.
	RootlessCgroups bool `json:"rootless_cgroups,omitempty"`
}

Config defines configuration options for executing a process inside a contained environment.

func (Config) HostGID 

func (c Config) HostGID(containerId int) (int, error)

HostGID gets the translated gid for the process on host which could be different when user namespaces are enabled.

func (Config) HostRootGID 

func (c Config) HostRootGID() (int, error)

HostRootGID gets the root gid for the process on host which could be non-zero when user namespaces are enabled.

func (Config) HostRootUID 

func (c Config) HostRootUID() (int, error)

HostRootUID gets the root uid for the process on host which could be non-zero when user namespaces are enabled.

func (Config) HostUID 

func (c Config) HostUID(containerId int) (int, error)

HostUID gets the translated uid for the process on host which could be different when user namespaces are enabled.

type Device 

type Device struct {
	// Device type, block, char, etc.
	Type rune `json:"type"`

	// Path to the device.
	Path string `json:"path"`

	// Major is the device's major number.
	Major int64 `json:"major"`

	// Minor is the device's minor number.
	Minor int64 `json:"minor"`

	// Cgroup permissions format, rwm.
	Permissions string `json:"permissions"`

	// FileMode permission bits for the device.
	FileMode os.FileMode `json:"file_mode"`

	// Uid of the device.
	Uid uint32 `json:"uid"`

	// Gid of the device.
	Gid uint32 `json:"gid"`

	// Write the file to the allowed list
	Allow bool `json:"allow"`
}

func (*Device) CgroupString 

func (d *Device) CgroupString() string

func (*Device) Mkdev 

func (d *Device) Mkdev() int

type FreezerState 

type FreezerState string
const (
	Undefined FreezerState = ""
	Frozen    FreezerState = "FROZEN"
	Thawed    FreezerState = "THAWED"
)

type FuncHook 

type FuncHook struct {
	// contains filtered or unexported fields
}

func NewFunctionHook 

func NewFunctionHook(f func(*specs.State) error) FuncHook

NewFunctionHook will call the provided function when the hook is run.

func (FuncHook) Run 

func (f FuncHook) Run(s *specs.State) error

type Hook 

type Hook interface {
	// Run executes the hook with the provided state.
	Run(*specs.State) error
}

type Hooks 

type Hooks struct {
	// Prestart commands are executed after the container namespaces are created,
	// but before the user supplied command is executed from init.
	Prestart []Hook

	// Poststart commands are executed after the container init process starts.
	Poststart []Hook

	// Poststop commands are executed after the container init process exits.
	Poststop []Hook
}

func (Hooks) MarshalJSON 

func (hooks Hooks) MarshalJSON() ([]byte, error)

func (*Hooks) UnmarshalJSON 

func (hooks *Hooks) UnmarshalJSON(b []byte) error

type HugepageLimit 

type HugepageLimit struct {
	// which type of hugepage to limit.
	Pagesize string `json:"page_size"`

	// usage limit for hugepage.
	Limit uint64 `json:"limit"`
}

type IDMap 

type IDMap struct {
	ContainerID int `json:"container_id"`
	HostID      int `json:"host_id"`
	Size        int `json:"size"`
}

IDMap represents UID/GID Mappings for User Namespaces.

type IfPrioMap 

type IfPrioMap struct {
	Interface string `json:"interface"`
	Priority  int64  `json:"priority"`
}

func (*IfPrioMap) CgroupString 

func (i *IfPrioMap) CgroupString() string

type IntelRdt 

type IntelRdt struct {
	// The schema for L3 cache id and capacity bitmask (CBM)
	// Format: "L3:<cache_id0>=<cbm0>;<cache_id1>=<cbm1>;..."
	L3CacheSchema string `json:"l3_cache_schema,omitempty"`

	// The schema of memory bandwidth percentage per L3 cache id
	// Format: "MB:<cache_id0>=bandwidth0;<cache_id1>=bandwidth1;..."
	MemBwSchema string `json:"memBwSchema,omitempty"`
}

type Mount 

type Mount struct {
	// Source path for the mount.
	Source string `json:"source"`

	// Destination path for the mount inside the container.
	Destination string `json:"destination"`

	// Device the mount is for.
	Device string `json:"device"`

	// Mount flags.
	Flags int `json:"flags"`

	// Propagation Flags
	PropagationFlags []int `json:"propagation_flags"`

	// Mount data applied to the mount.
	Data string `json:"data"`

	// Relabel source if set, "z" indicates shared, "Z" indicates unshared.
	Relabel string `json:"relabel"`

	// Extensions are additional flags that are specific to runc.
	Extensions int `json:"extensions"`

	// Optional Command to be run before Source is mounted.
	PremountCmds []Command `json:"premount_cmds"`

	// Optional Command to be run after Source is mounted.
	PostmountCmds []Command `json:"postmount_cmds"`
}

type Namespace 

type Namespace struct {
	Type NamespaceType `json:"type"`
	Path string        `json:"path"`
}

Namespace defines configuration for each namespace. It specifies an alternate path that is able to be joined via setns.

func (*Namespace) GetPath 

func (n *Namespace) GetPath(pid int) string

func (*Namespace) Syscall 

func (n *Namespace) Syscall() int

type NamespaceType 

type NamespaceType string
const (
	NEWNET    NamespaceType = "NEWNET"
	NEWPID    NamespaceType = "NEWPID"
	NEWNS     NamespaceType = "NEWNS"
	NEWUTS    NamespaceType = "NEWUTS"
	NEWIPC    NamespaceType = "NEWIPC"
	NEWUSER   NamespaceType = "NEWUSER"
	NEWCGROUP NamespaceType = "NEWCGROUP"
)

func NamespaceTypes 

func NamespaceTypes() []NamespaceType

type Namespaces 

type Namespaces []Namespace

func (*Namespaces) Add 

func (n *Namespaces) Add(t NamespaceType, path string)

func (*Namespaces) CloneFlags 

func (n *Namespaces) CloneFlags() uintptr

CloneFlags parses the container's Namespaces options to set the correct flags on clone, unshare. This function returns flags only for new namespaces.

func (*Namespaces) Contains 

func (n *Namespaces) Contains(t NamespaceType) bool

func (*Namespaces) PathOf 

func (n *Namespaces) PathOf(t NamespaceType) string

func (*Namespaces) Remove 

func (n *Namespaces) Remove(t NamespaceType) bool

type Network 

type Network struct {
	// Type sets the networks type, commonly veth and loopback
	Type string `json:"type"`

	// Name of the network interface
	Name string `json:"name"`

	// The bridge to use.
	Bridge string `json:"bridge"`

	// MacAddress contains the MAC address to set on the network interface
	MacAddress string `json:"mac_address"`

	// Address contains the IPv4 and mask to set on the network interface
	Address string `json:"address"`

	// Gateway sets the gateway address that is used as the default for the interface
	Gateway string `json:"gateway"`

	// IPv6Address contains the IPv6 and mask to set on the network interface
	IPv6Address string `json:"ipv6_address"`

	// IPv6Gateway sets the ipv6 gateway address that is used as the default for the interface
	IPv6Gateway string `json:"ipv6_gateway"`

	// Mtu sets the mtu value for the interface and will be mirrored on both the host and
	// container's interfaces if a pair is created, specifically in the case of type veth
	// Note: This does not apply to loopback interfaces.
	Mtu int `json:"mtu"`

	// TxQueueLen sets the tx_queuelen value for the interface and will be mirrored on both the host and
	// container's interfaces if a pair is created, specifically in the case of type veth
	// Note: This does not apply to loopback interfaces.
	TxQueueLen int `json:"txqueuelen"`

	// HostInterfaceName is a unique name of a veth pair that resides on in the host interface of the
	// container.
	HostInterfaceName string `json:"host_interface_name"`

	// HairpinMode specifies if hairpin NAT should be enabled on the virtual interface
	// bridge port in the case of type veth
	// Note: This is unsupported on some systems.
	// Note: This does not apply to loopback interfaces.
	HairpinMode bool `json:"hairpin_mode"`
}

Network defines configuration for a container's networking stack

The network configuration can be omitted from a container causing the container to be setup with the host's networking stack

type Operator 

type Operator int

Operator is a comparison operator to be used when matching syscall arguments in Seccomp 

const (
	EqualTo Operator = iota + 1
	NotEqualTo
	GreaterThan
	GreaterThanOrEqualTo
	LessThan
	LessThanOrEqualTo
	MaskEqualTo
)

type Resources 

type Resources struct {
	// If this is true allow access to any kind of device within the container.  If false, allow access only to devices explicitly listed in the allowed_devices list.
	// Deprecated
	AllowAllDevices *bool `json:"allow_all_devices,omitempty"`
	// Deprecated
	AllowedDevices []*Device `json:"allowed_devices,omitempty"`
	// Deprecated
	DeniedDevices []*Device `json:"denied_devices,omitempty"`

	Devices []*Device `json:"devices"`

	// Memory limit (in bytes)
	Memory int64 `json:"memory"`

	// Memory reservation or soft_limit (in bytes)
	MemoryReservation int64 `json:"memory_reservation"`

	// Total memory usage (memory + swap); set `-1` to enable unlimited swap
	MemorySwap int64 `json:"memory_swap"`

	// Kernel memory limit (in bytes)
	KernelMemory int64 `json:"kernel_memory"`

	// Kernel memory limit for TCP use (in bytes)
	KernelMemoryTCP int64 `json:"kernel_memory_tcp"`

	// CPU shares (relative weight vs. other containers)
	CpuShares uint64 `json:"cpu_shares"`

	// CPU hardcap limit (in usecs). Allowed cpu time in a given period.
	CpuQuota int64 `json:"cpu_quota"`

	// CPU period to be used for hardcapping (in usecs). 0 to use system default.
	CpuPeriod uint64 `json:"cpu_period"`

	// How many time CPU will use in realtime scheduling (in usecs).
	CpuRtRuntime int64 `json:"cpu_rt_quota"`

	// CPU period to be used for realtime scheduling (in usecs).
	CpuRtPeriod uint64 `json:"cpu_rt_period"`

	// CPU to use
	CpusetCpus string `json:"cpuset_cpus"`

	// MEM to use
	CpusetMems string `json:"cpuset_mems"`

	// Process limit; set <= `0' to disable limit.
	PidsLimit int64 `json:"pids_limit"`

	// Specifies per cgroup weight, range is from 10 to 1000.
	BlkioWeight uint16 `json:"blkio_weight"`

	// Specifies tasks' weight in the given cgroup while competing with the cgroup's child cgroups, range is from 10 to 1000, cfq scheduler only
	BlkioLeafWeight uint16 `json:"blkio_leaf_weight"`

	// Weight per cgroup per device, can override BlkioWeight.
	BlkioWeightDevice []*WeightDevice `json:"blkio_weight_device"`

	// IO read rate limit per cgroup per device, bytes per second.
	BlkioThrottleReadBpsDevice []*ThrottleDevice `json:"blkio_throttle_read_bps_device"`

	// IO write rate limit per cgroup per device, bytes per second.
	BlkioThrottleWriteBpsDevice []*ThrottleDevice `json:"blkio_throttle_write_bps_device"`

	// IO read rate limit per cgroup per device, IO per second.
	BlkioThrottleReadIOPSDevice []*ThrottleDevice `json:"blkio_throttle_read_iops_device"`

	// IO write rate limit per cgroup per device, IO per second.
	BlkioThrottleWriteIOPSDevice []*ThrottleDevice `json:"blkio_throttle_write_iops_device"`

	// set the freeze value for the process
	Freezer FreezerState `json:"freezer"`

	// Hugetlb limit (in bytes)
	HugetlbLimit []*HugepageLimit `json:"hugetlb_limit"`

	// Whether to disable OOM Killer
	OomKillDisable bool `json:"oom_kill_disable"`

	// Tuning swappiness behaviour per cgroup
	MemorySwappiness *uint64 `json:"memory_swappiness"`

	// Set priority of network traffic for container
	NetPrioIfpriomap []*IfPrioMap `json:"net_prio_ifpriomap"`

	// Set class identifier for container's network packets
	NetClsClassid uint32 `json:"net_cls_classid_u"`
}

type Rlimit 

type Rlimit struct {
	Type int    `json:"type"`
	Hard uint64 `json:"hard"`
	Soft uint64 `json:"soft"`
}

type Route 

type Route struct {
	// Sets the destination and mask, should be a CIDR.  Accepts IPv4 and IPv6
	Destination string `json:"destination"`

	// Sets the source and mask, should be a CIDR.  Accepts IPv4 and IPv6
	Source string `json:"source"`

	// Sets the gateway.  Accepts IPv4 and IPv6
	Gateway string `json:"gateway"`

	// The device to set this route up for, for example: eth0
	InterfaceName string `json:"interface_name"`
}

Routes can be specified to create entries in the route table as the container is started

All of destination, source, and gateway should be either IPv4 or IPv6. One of the three options must be present, and omitted entries will use their IP family default for the route table. For IPv4 for example, setting the gateway to 1.2.3.4 and the interface to eth0 will set up a standard destination of 0.0.0.0(or *) when viewed in the route table.

type Seccomp 

type Seccomp struct {
	DefaultAction Action     `json:"default_action"`
	Architectures []string   `json:"architectures"`
	Syscalls      []*Syscall `json:"syscalls"`
}

Seccomp represents syscall restrictions By default, only the native architecture of the kernel is allowed to be used for syscalls. Additional architectures can be added by specifying them in Architectures.

type Syscall 

type Syscall struct {
	Name   string `json:"name"`
	Action Action `json:"action"`
	Args   []*Arg `json:"args"`
}

Syscall is a rule to match a syscall in Seccomp

type ThrottleDevice 

type ThrottleDevice struct {

	// Rate is the IO rate limit per cgroup per device
	Rate uint64 `json:"rate"`
	// contains filtered or unexported fields
}

ThrottleDevice struct holds a `major:minor rate_per_second` pair

func NewThrottleDevice 

func NewThrottleDevice(major, minor int64, rate uint64) *ThrottleDevice

NewThrottleDevice returns a configured ThrottleDevice pointer

func (*ThrottleDevice) String 

func (td *ThrottleDevice) String() string

String formats the struct to be writable to the cgroup specific file

type WeightDevice 

type WeightDevice struct {

	// Weight is the bandwidth rate for the device, range is from 10 to 1000
	Weight uint16 `json:"weight"`
	// LeafWeight is the bandwidth rate for the device while competing with the cgroup's child cgroups, range is from 10 to 1000, cfq scheduler only
	LeafWeight uint16 `json:"leafWeight"`
	// contains filtered or unexported fields
}

WeightDevice struct holds a `major:minor weight`|`major:minor leaf_weight` pair

func NewWeightDevice 

func NewWeightDevice(major, minor int64, weight, leafWeight uint16) *WeightDevice

NewWeightDevice returns a configured WeightDevice pointer

func (*WeightDevice) LeafWeightString 

func (wd *WeightDevice) LeafWeightString() string

LeafWeightString formats the struct to be writable to the cgroup specific file

func (*WeightDevice) WeightString 

func (wd *WeightDevice) WeightString() string

WeightString formats the struct to be writable to the cgroup specific file

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