539742881d
Working from feedback on the existing implementation, we have now introduced a central metadata object to represent the lifecycle and pin the resources required to implement what people today know as containers. This includes the runtime specification and the root filesystem snapshots. We also allow arbitrary labeling of the container. Such provisions will bring the containerd definition of container closer to what is expected by users. The objects that encompass today's ContainerService, centered around the runtime, will be known as tasks. These tasks take on the existing lifecycle behavior of containerd's containers, which means that they are deleted when they exit. Largely, there are no other changes except for naming. The `Container` object will operate purely as a metadata object. No runtime state will be held on `Container`. It only informs the execution service on what is required for creating tasks and the resources in use by that container. The resources referenced by that container will be deleted when the container is deleted, if not in use. In this sense, users can create, list, label and delete containers in a similar way as they do with docker today, without the complexity of runtime locks that plagues current implementations. Signed-off-by: Stephen J Day <stephen.day@docker.com>
80 lines
1.8 KiB
Go
80 lines
1.8 KiB
Go
package plugin
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import "context"
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type TaskInfo struct {
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ID string
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ContainerID string
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Runtime string
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Spec []byte
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}
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type Task interface {
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// Information of the container
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Info() TaskInfo
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// Start the container's user defined process
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Start(context.Context) error
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// State returns the container's state
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State(context.Context) (State, error)
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// Pause pauses the container process
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Pause(context.Context) error
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// Resume unpauses the container process
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Resume(context.Context) error
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// Kill signals a container
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Kill(context.Context, uint32, uint32, bool) error
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// Exec adds a process into the container
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Exec(context.Context, ExecOpts) (Process, error)
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// Processes returns all pids for the container
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Processes(context.Context) ([]uint32, error)
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// Pty resizes the processes pty/console
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Pty(context.Context, uint32, ConsoleSize) error
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// CloseStdin closes the processes stdin
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CloseStdin(context.Context, uint32) error
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// Checkpoint checkpoints a container to an image with live system data
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Checkpoint(context.Context, CheckpointOpts) error
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}
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type CheckpointOpts struct {
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Exit bool
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AllowTCP bool
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AllowUnixSockets bool
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AllowTerminal bool
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FileLocks bool
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EmptyNamespaces []string
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Path string
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}
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type ExecOpts struct {
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Spec []byte
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IO IO
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}
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type Process interface {
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// State returns the process state
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State(context.Context) (State, error)
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// Kill signals a container
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Kill(context.Context, uint32, bool) error
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}
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type ConsoleSize struct {
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Width uint32
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Height uint32
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}
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type Status int
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const (
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CreatedStatus Status = iota + 1
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RunningStatus
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StoppedStatus
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DeletedStatus
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PausedStatus
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)
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type State interface {
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// Status is the current status of the container
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Status() Status
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// Pid is the main process id for the container
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Pid() uint32
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}
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