devices

package
Version: v1.0.2 Latest Latest
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Published: Aug 20, 2021 License: Apache-2.0 Imports: 7 Imported by: 170

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Index

Constants

View Source
const (
	Wildcard = -1
)

Variables

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var ErrNotADevice = errors.New("not a device node")

ErrNotADevice denotes that a file is not a valid linux device.

Functions

This section is empty.

Types

type Device added in v1.0.0

type Device struct {
	Rule

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

	// 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"`
}

func DeviceFromPath

func DeviceFromPath(path, permissions string) (*Device, error)

DeviceFromPath takes the path to a device and its cgroup_permissions (which cannot be easily queried) to look up the information about a linux device and returns that information as a Device struct.

func GetDevices added in v1.0.0

func GetDevices(path string) ([]*Device, error)

GetDevices recursively traverses a directory specified by path and returns all devices found there.

func HostDevices

func HostDevices() ([]*Device, error)

HostDevices returns all devices that can be found under /dev directory.

type Permissions added in v1.0.0

type Permissions string

Permissions is a cgroupv1-style string to represent device access. It has to be a string for backward compatibility reasons, hence why it has methods to do set operations.

func (Permissions) Difference added in v1.0.0

func (p Permissions) Difference(o Permissions) Permissions

Difference returns the set difference of the two sets of Permissions. In set notation, A.Difference(B) gives you A\B.

func (Permissions) Intersection added in v1.0.0

func (p Permissions) Intersection(o Permissions) Permissions

Intersection computes the intersection of the two sets of Permissions.

func (Permissions) IsEmpty added in v1.0.0

func (p Permissions) IsEmpty() bool

IsEmpty returns whether the set of permissions in a Permissions is empty.

func (Permissions) IsValid added in v1.0.0

func (p Permissions) IsValid() bool

IsValid returns whether the set of permissions is a subset of valid permissions (namely, {r,w,m}).

func (Permissions) Union added in v1.0.0

func (p Permissions) Union(o Permissions) Permissions

Union returns the union of the two sets of Permissions.

type Rule added in v1.0.0

type Rule struct {
	// Type of device ('c' for char, 'b' for block). If set to 'a', this rule
	// acts as a wildcard and all fields other than Allow are ignored.
	Type Type `json:"type"`

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

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

	// Permissions is the set of permissions that this rule applies to (in the
	// cgroupv1 format -- any combination of "rwm").
	Permissions Permissions `json:"permissions"`

	// Allow specifies whether this rule is allowed.
	Allow bool `json:"allow"`
}

func (*Rule) CgroupString added in v1.0.0

func (d *Rule) CgroupString() string

func (*Rule) Mkdev added in v1.0.0

func (d *Rule) Mkdev() (uint64, error)

type Type added in v1.0.0

type Type rune
const (
	WildcardDevice Type = 'a'
	BlockDevice    Type = 'b'
	CharDevice     Type = 'c' // or 'u'
	FifoDevice     Type = 'p'
)

func (Type) CanCgroup added in v1.0.0

func (t Type) CanCgroup() bool

func (Type) CanMknod added in v1.0.0

func (t Type) CanMknod() bool

func (Type) IsValid added in v1.0.0

func (t Type) IsValid() bool

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