containerd/cmd/ctr/start.go

package main

import (
	"github.com/containerd/console"
	"github.com/opencontainers/go-digest"
	"github.com/pkg/errors"
	"github.com/sirupsen/logrus"
	"github.com/urfave/cli"
)

var taskStartCommand = cli.Command{
	Name:      "start",
	Usage:     "start a container that have been created",
	ArgsUsage: "CONTAINER",
	Action: func(context *cli.Context) error {
		var (
			err error

			ctx, cancel = appContext(context)
			id          = context.Args().Get(0)
		)

		defer cancel()

		if id == "" {
			return errors.New("container id must be provided")
		}
		client, err := newClient(context)
		if err != nil {
			return err
		}
		container, err := client.LoadContainer(ctx, id)
		if err != nil {
			return err
		}

		spec, err := container.Spec(ctx)
		if err != nil {
			return err
		}

		tty := spec.Process.Terminal

		task, err := newTask(ctx, container, digest.Digest(""), tty)
		if err != nil {
			return err
		}
		defer task.Delete(ctx)

		statusC, err := task.Wait(ctx)
		if err != nil {
			return err
		}

		var con console.Console
		if tty {
			con = console.Current()
			defer con.Reset()
			if err := con.SetRaw(); err != nil {
				return err
			}
		}
		if err := task.Start(ctx); err != nil {
			return err
		}
		if tty {
			if err := handleConsoleResize(ctx, task, con); err != nil {
				logrus.WithError(err).Error("console resize")
			}
		} else {
			sigc := forwardAllSignals(ctx, task)
			defer stopCatch(sigc)
		}

		status := <-statusC
		code, _, err := status.Result()
		if err != nil {
			return err
		}
		if _, err := task.Delete(ctx); err != nil {
			return err
		}
		if code != 0 {
			return cli.NewExitError("", int(code))
		}
		return nil
	},
}