containerutil

Documentation

Index

• Constants
• func ContainerNetNSPath(ctx context.Context, c containerd.Container) (string, error)
• func ContainerStateDirPath(ns, dataStore, id string) (string, error)
• func ContainerStatus(ctx context.Context, c containerd.Container) (containerd.Status, error)
• func CopyFiles(ctx context.Context, client *containerd.Client, container containerd.Container, ...) error
• func GenerateSharingPIDOpts(ctx context.Context, targetCon containerd.Container) ([]oci.SpecOpts, error)
• func NetworkOptionsFromSpec(spec *specs.Spec) (types.NetworkOptions, error)
• func Pause(ctx context.Context, client *containerd.Client, id string) error
• func PrintHostPort(ctx context.Context, writer io.Writer, container containerd.Container, ...) error
• func ReconfigNetContainer(ctx context.Context, c containerd.Container, client *containerd.Client, ...) error
• func ReconfigPIDContainer(ctx context.Context, c containerd.Container, client *containerd.Client, ...) error
• func Start(ctx context.Context, container containerd.Container, flagA bool, ...) (err error)
• func Stop(ctx context.Context, container containerd.Container, timeout *time.Duration) (err error)
• func Unpause(ctx context.Context, client *containerd.Client, id string) error
• func UpdateErrorLabel(ctx context.Context, container containerd.Container, err error) error
• func UpdateExplicitlyStoppedLabel(ctx context.Context, container containerd.Container, explicitlyStopped bool) error
• func UpdateStatusLabel(ctx context.Context, container containerd.Container, ...) error
• func WithBindMountHostProcfs(_ context.Context, _ oci.Client, _ *containers.Container, s *oci.Spec) error
• type ContainerVolume
  • func GetContainerVolumes(containerLabels map[string]string) []*ContainerVolume
• type NetworkOptionsManager
  • func NewNetworkingOptionsManager(globalOptions types.GlobalCommandOptions, netOpts types.NetworkOptions, ...) (NetworkOptionsManager, error)

Constants

const (
	UtsNamespaceHost = "host"
)

Functions

func ContainerNetNSPath

func ContainerNetNSPath(ctx context.Context, c containerd.Container) (string, error)

ContainerNetNSPath returns the netns path of a container.

func ContainerStateDirPath

func ContainerStateDirPath(ns, dataStore, id string) (string, error)

ContainerStateDirPath returns the path to the Nerdctl-managed state directory for the container with the given ID.

func ContainerStatus

func ContainerStatus(ctx context.Context, c containerd.Container) (containerd.Status, error)

ContainerStatus returns the container's status from its task.

func CopyFiles

func CopyFiles(ctx context.Context, client *containerd.Client, container containerd.Container, container2host bool, dst, src string, snapshotter string, followSymlink bool) error

CopyFiles implements `nerdctl cp`. See https://docs.docker.com/engine/reference/commandline/cp/ for the specification.

func GenerateSharingPIDOpts

func GenerateSharingPIDOpts(ctx context.Context, targetCon containerd.Container) ([]oci.SpecOpts, error)

GenerateSharingPIDOpts returns the oci.SpecOpts that shares the host linux namespace from `targetCon` If `targetCon` doesn't have a `PIDNamespace`, a new one is generated from its `Pid`.

func NetworkOptionsFromSpec

func NetworkOptionsFromSpec(spec *specs.Spec) (types.NetworkOptions, error)

NetworkOptionsFromSpec Returns the NetworkOptions used in a container's creation from its spec.Annotations.

func Pause

func Pause(ctx context.Context, client *containerd.Client, id string) error

Pause pauses a container by its id.

func PrintHostPort

func PrintHostPort(ctx context.Context, writer io.Writer, container containerd.Container, containerPort int, proto string) error

PrintHostPort writes to `writer` the public (HostIP:HostPort) of a given `containerPort/protocol` in a container. if `containerPort < 0`, it writes all public ports of the container.

func ReconfigNetContainer

func ReconfigNetContainer(ctx context.Context, c containerd.Container, client *containerd.Client, lab map[string]string) error

ReconfigNetContainer reconfigures the container's network namespace path.

func ReconfigPIDContainer

func ReconfigPIDContainer(ctx context.Context, c containerd.Container, client *containerd.Client, lab map[string]string) error

ReconfigPIDContainer reconfigures the container's spec options for sharing PID namespace.

func Start

func Start(ctx context.Context, container containerd.Container, flagA bool, client *containerd.Client, detachKeys string) (err error)

Start starts `container` with `attach` flag. If `attach` is true, it will attach to the container's stdio.

func Stop

func Stop(ctx context.Context, container containerd.Container, timeout *time.Duration) (err error)

Stop stops `container` by sending SIGTERM. If the container is not stopped after `timeout`, it sends a SIGKILL.

func Unpause

func Unpause(ctx context.Context, client *containerd.Client, id string) error

Unpause unpauses a container by its id.

func UpdateErrorLabel

func UpdateErrorLabel(ctx context.Context, container containerd.Container, err error) error

UpdateErrorLabel updates the "nerdctl/error" label of the container according to the container error.

func UpdateExplicitlyStoppedLabel

func UpdateExplicitlyStoppedLabel(ctx context.Context, container containerd.Container, explicitlyStopped bool) error

UpdateExplicitlyStoppedLabel updates the "containerd.io/restart.explicitly-stopped" label of the container according to the value of explicitlyStopped.

func UpdateStatusLabel

func UpdateStatusLabel(ctx context.Context, container containerd.Container, status containerd.ProcessStatus) error

UpdateStatusLabel updates the "containerd.io/restart.status" label of the container according to the value of restart desired status.

func WithBindMountHostProcfs

func WithBindMountHostProcfs(_ context.Context, _ oci.Client, _ *containers.Container, s *oci.Spec) error

WithBindMountHostProcfs replaces procfs mount with rbind. Required for --pid=host on rootless.

https://github.com/moby/moby/pull/41893/files https://github.com/containers/podman/blob/v3.0.0-rc1/pkg/specgen/generate/oci.go#L248-L257

Types

type ContainerVolume

type ContainerVolume struct {
	Type        string
	Name        string
	Source      string
	Destination string
	Mode        string
	RW          bool
	Propagation string
}

ContainerVolume is a struct representing a volume in a container.

func GetContainerVolumes

func GetContainerVolumes(containerLabels map[string]string) []*ContainerVolume

GetContainerVolumes is a function that returns a slice of containerVolume pointers. It accepts a map of container labels as input, where key is the label name and value is its associated value. The function iterates over the predefined volume labels (AnonymousVolumes and Mounts) and for each, it checks if the labels exists in the provided container labels. If yes, it decodes the label value from JSON format and appends the volumes to the result. In case of error during decoding, it logs the error and continues to the next label.

type NetworkOptionsManager

type NetworkOptionsManager interface {
	// NetworkOptions Returns a copy of the internal types.NetworkOptions.
	NetworkOptions() types.NetworkOptions

	// VerifyNetworkOptions Verifies that the internal network settings are correct.
	VerifyNetworkOptions(context.Context) error

	// SetupNetworking Performs setup actions required for the container with the given ID.
	SetupNetworking(context.Context, string) error

	// CleanupNetworking Performs any required cleanup actions for the given container.
	// Should only be called to revert any setup steps performed in SetupNetworking.
	CleanupNetworking(context.Context, containerd.Container) error

	// InternalNetworkingOptionLabels Returns the set of NetworkingOptions which should be set as labels on the container.
	//
	// These options can potentially differ from the actual networking options
	// that the NetworkOptionsManager was initially instantiated with.
	// E.g: in container networking mode, the label will be normalized to an ID:
	// `--net=container:myContainer` => `--net=container:<ID of myContainer>`.
	InternalNetworkingOptionLabels(context.Context) (types.NetworkOptions, error)

	// ContainerNetworkingOpts Returns a slice of `oci.SpecOpts` and `containerd.NewContainerOpts` which represent
	// the network specs which need to be applied to the container with the given ID.
	ContainerNetworkingOpts(context.Context, string) ([]oci.SpecOpts, []containerd.NewContainerOpts, error)
}

NetworkOptionsManager types.NetworkOptionsManager is an interface for reading/setting networking options for containers based on the provided command flags.

func NewNetworkingOptionsManager

func NewNetworkingOptionsManager(globalOptions types.GlobalCommandOptions, netOpts types.NetworkOptions, client *containerd.Client) (NetworkOptionsManager, error)

NewNetworkingOptionsManager Returns a types.NetworkOptionsManager based on the provided command's flags.