feature:support live-restore

[ningmingxiao]

I find containerd will not close pipes until call delete it will cause some ci failed.

func (p *Init) delete(ctx context.Context) error {
	waitTimeout(ctx, &p.wg, 2*time.Second)
	err := p.runtime.Delete(ctx, p.id, nil)
	// ignore errors if a runtime has already deleted the process
	// but we still hold metadata and pipes
	//
	// this is common during a checkpoint, runc will delete the container state
	// after a checkpoint and the container will no longer exist within runc
	if err != nil {
		if strings.Contains(err.Error(), "does not exist") {
			err = nil
		} else {
			err = p.runtimeError(err, "failed to delete task")
		}
	}
	if p.io != nil {
		for _, c := range p.closers {
			c.Close()
		}
		p.io.Close()
	}
	if err2 := mount.UnmountRecursive(p.Rootfs, 0); err2 != nil {
		log.G(ctx).WithError(err2).Warn("failed to cleanup rootfs mount")
		if err == nil {
			err = fmt.Errorf("failed rootfs umount: %w", err2)
		}
	}
	return err
}

failed ci

func TestLogsFollowNoExtraneousLineFeed(t *testing.T) {
	testCase := nerdtest.Setup()
	// This test verifies that `nerdctl logs -f` does not add extraneous line feeds
	testCase.Require = require.Not(require.Windows)

	testCase.Setup = func(data test.Data, helpers test.Helpers) {
		// Create a container that outputs a message without a trailing newline
		helpers.Ensure("run", "--name", data.Identifier(), testutil.CommonImage,
			"sh", "-c", "printf 'Hello without newline'")
	}

[ningmingxiao]

can you review this pr containerd/containerd#12281 ? @AkihiroSuda
If this pr merged nerdctl logdriver will no longer need try to connect containerd to get container status. Thanks