// Signal handles `docker stop` on Windows. While Linux has support for
// the full range of signals, signals aren't really implemented on Windows.
// We fake supporting regular stop and -9 to force kill.
func (clnt *client) Signal(containerID string, sig int) error {
var (
cont *container
err error
)
// Get the container as we need it to get the container handle.
clnt.lock(containerID)
defer clnt.unlock(containerID)
if cont, err = clnt.getContainer(containerID); err != nil {
return err
}
cont.manualStopRequested = true
logrus.Debugf("libcontainerd: Signal() containerID=%s sig=%d pid=%d", containerID, sig, cont.systemPid)
if syscall.Signal(sig) == syscall.SIGKILL {
// Terminate the compute system
if err := cont.hcsContainer.Terminate(); err != nil {
if !hcsshim.IsPending(err) {
logrus.Errorf("libcontainerd: failed to terminate %s - %q", containerID, err)
}
}
} else {
// Terminate Process
if err := cont.hcsProcess.Kill(); err != nil && !hcsshim.IsAlreadyStopped(err) {
// ignore errors
logrus.Warnf("libcontainerd: failed to terminate pid %d in %s: %q", cont.systemPid, containerID, err)
}
}
return nil
}
// terminate terminates the container in HCS
// Caller needs to lock container ID before calling this method.
func (ctr *container) terminate() error {
const terminateTimeout = time.Minute * 5
err := ctr.hcsContainer.Terminate()
if hcsshim.IsPending(err) {
err = ctr.hcsContainer.WaitTimeout(terminateTimeout)
} else if hcsshim.IsAlreadyStopped(err) {
err = nil
}
if err != nil {
logrus.Debugf("libcontainerd: error terminating container %s %v", ctr.containerID, err)
return err
}
return nil
}
// shutdown shuts down the container in HCS
// Caller needs to lock container ID before calling this method.
func (ctr *container) shutdown() error {
const shutdownTimeout = time.Minute * 5
err := ctr.hcsContainer.Shutdown()
if hcsshim.IsPending(err) {
// Explicit timeout to avoid a (remote) possibility that shutdown hangs indefinitely.
err = ctr.hcsContainer.WaitTimeout(shutdownTimeout)
} else if hcsshim.IsAlreadyStopped(err) {
err = nil
}
if err != nil {
logrus.Debugf("libcontainerd: error shutting down container %s %v calling terminate", ctr.containerID, err)
if err := ctr.terminate(); err != nil {
return err
}
return err
}
return nil
}
// Remove unmounts and removes the dir information.
func (d *Driver) Remove(id string) error {
rID, err := d.resolveID(id)
if err != nil {
return err
}
// This retry loop is due to a bug in Windows (Internal bug #9432268)
// if GetContainers fails with ErrVmcomputeOperationInvalidState
// it is a transient error. Retry until it succeeds.
var computeSystems []hcsshim.ContainerProperties
retryCount := 0
for {
// Get and terminate any template VMs that are currently using the layer
computeSystems, err = hcsshim.GetContainers(hcsshim.ComputeSystemQuery{})
if err != nil {
if err == hcsshim.ErrVmcomputeOperationInvalidState {
if retryCount >= 5 {
// If we are unable to get the list of containers
// go ahead and attempt to delete the layer anyway
// as it will most likely work.
break
}
retryCount++
time.Sleep(2 * time.Second)
continue
}
return err
}
break
}
for _, computeSystem := range computeSystems {
if strings.Contains(computeSystem.RuntimeImagePath, id) && computeSystem.IsRuntimeTemplate {
container, err := hcsshim.OpenContainer(computeSystem.ID)
if err != nil {
return err
}
defer container.Close()
err = container.Terminate()
if hcsshim.IsPending(err) {
err = container.Wait()
} else if hcsshim.IsAlreadyStopped(err) {
err = nil
}
if err != nil {
return err
}
}
}
layerPath := filepath.Join(d.info.HomeDir, rID)
tmpID := fmt.Sprintf("%s-removing", rID)
tmpLayerPath := filepath.Join(d.info.HomeDir, tmpID)
if err := os.Rename(layerPath, tmpLayerPath); err != nil && !os.IsNotExist(err) {
return err
}
if err := hcsshim.DestroyLayer(d.info, tmpID); err != nil {
logrus.Errorf("Failed to DestroyLayer %s: %s", id, err)
}
return nil
}
