113 lines
2.7 KiB
Go
113 lines
2.7 KiB
Go
package containerd
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import (
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"context"
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"encoding/json"
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"syscall"
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"github.com/containerd/containerd/api/services/execution"
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taskapi "github.com/containerd/containerd/api/types/task"
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protobuf "github.com/gogo/protobuf/types"
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specs "github.com/opencontainers/runtime-spec/specs-go"
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)
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type process struct {
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task *task
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// this is a hack to make a blocking Wait work
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// exec does not have a create/start split so if a quick exiting process like `exit 1`
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// run, the wait does not have enough time to get the pid catch the event. So we need
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// to lock this on process struct create and only unlock it after the pid is set
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// this allow the wait to be called before calling process start and not race with the exit event
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pidSync chan struct{}
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io *IO
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pid uint32
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spec *specs.Process
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}
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// Pid returns the pid of the process
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// The pid is not set until start is called and returns
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func (p *process) Pid() uint32 {
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return p.pid
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}
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// Start starts the exec process
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func (p *process) Start(ctx context.Context) error {
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data, err := json.Marshal(p.spec)
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if err != nil {
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return err
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}
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request := &execution.ExecRequest{
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ContainerID: p.task.containerID,
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Terminal: p.io.Terminal,
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Stdin: p.io.Stdin,
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Stdout: p.io.Stdout,
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Stderr: p.io.Stderr,
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Spec: &protobuf.Any{
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TypeUrl: specs.Version,
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Value: data,
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},
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}
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response, err := p.task.client.TaskService().Exec(ctx, request)
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if err != nil {
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return err
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}
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p.pid = response.Pid
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close(p.pidSync)
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return nil
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}
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func (p *process) Kill(ctx context.Context, s syscall.Signal) error {
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_, err := p.task.client.TaskService().Kill(ctx, &execution.KillRequest{
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Signal: uint32(s),
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ContainerID: p.task.containerID,
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PidOrAll: &execution.KillRequest_Pid{
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Pid: p.pid,
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},
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})
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return err
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}
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func (p *process) Wait(ctx context.Context) (uint32, error) {
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events, err := p.task.client.TaskService().Events(ctx, &execution.EventsRequest{})
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if err != nil {
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return UnknownExitStatus, err
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}
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<-p.pidSync
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for {
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e, err := events.Recv()
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if err != nil {
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return UnknownExitStatus, err
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}
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if e.Type != taskapi.Event_EXIT {
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continue
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}
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if e.ID == p.task.containerID && e.Pid == p.pid {
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return e.ExitStatus, nil
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}
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}
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}
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func (p *process) CloseStdin(ctx context.Context) error {
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_, err := p.task.client.TaskService().CloseStdin(ctx, &execution.CloseStdinRequest{
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ContainerID: p.task.containerID,
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Pid: p.pid,
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})
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return err
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}
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func (p *process) IO() *IO {
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return p.io
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}
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func (p *process) Resize(ctx context.Context, w, h uint32) error {
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_, err := p.task.client.TaskService().Pty(ctx, &execution.PtyRequest{
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ContainerID: p.task.containerID,
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Width: w,
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Height: h,
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Pid: p.pid,
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})
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return err
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}
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