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moby--moby/plugin/manager_linux.go

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// +build linux
package plugin
import (
"fmt"
"path/filepath"
"syscall"
"time"
"github.com/Sirupsen/logrus"
"github.com/docker/docker/libcontainerd"
"github.com/docker/docker/oci"
"github.com/docker/docker/pkg/plugins"
"github.com/docker/docker/plugin/v2"
specs "github.com/opencontainers/runtime-spec/specs-go"
)
func (pm *Manager) enable(p *v2.Plugin, force bool) error {
if p.IsEnabled() && !force {
return fmt.Errorf("plugin %s is already enabled", p.Name())
}
spec, err := p.InitSpec(oci.DefaultSpec(), pm.libRoot)
if err != nil {
return err
}
p.Lock()
p.Restart = true
p.Unlock()
if err := pm.containerdClient.Create(p.GetID(), "", "", specs.Spec(*spec), attachToLog(p.GetID())); err != nil {
return err
}
p.PClient, err = plugins.NewClient("unix://"+filepath.Join(p.RuntimeSourcePath, p.GetSocket()), nil)
if err != nil {
p.Lock()
p.Restart = false
p.Unlock()
return err
}
pm.pluginStore.SetState(p, true)
pm.pluginStore.CallHandler(p)
return nil
}
func (pm *Manager) restore(p *v2.Plugin) error {
return pm.containerdClient.Restore(p.GetID(), attachToLog(p.GetID()))
}
func shutdownPlugin(p *v2.Plugin, containerdClient libcontainerd.Client) {
pluginID := p.GetID()
err := containerdClient.Signal(pluginID, int(syscall.SIGTERM))
if err != nil {
logrus.Errorf("Sending SIGTERM to plugin failed with error: %v", err)
} else {
select {
case <-p.ExitChan:
logrus.Debug("Clean shutdown of plugin")
case <-time.After(time.Second * 10):
logrus.Debug("Force shutdown plugin")
if err := containerdClient.Signal(pluginID, int(syscall.SIGKILL)); err != nil {
logrus.Errorf("Sending SIGKILL to plugin failed with error: %v", err)
}
}
}
}
func (pm *Manager) disable(p *v2.Plugin) error {
if !p.IsEnabled() {
return fmt.Errorf("plugin %s is already disabled", p.Name())
}
p.Lock()
p.Restart = false
p.Unlock()
shutdownPlugin(p, pm.containerdClient)
pm.pluginStore.SetState(p, false)
return nil
}
// Shutdown stops all plugins and called during daemon shutdown.
func (pm *Manager) Shutdown() {
plugins := pm.pluginStore.GetAll()
for _, p := range plugins {
if pm.liveRestore && p.IsEnabled() {
logrus.Debug("Plugin active when liveRestore is set, skipping shutdown")
continue
}
if pm.containerdClient != nil && p.IsEnabled() {
p.Lock()
p.ExitChan = make(chan bool)
p.Restart = false
p.Unlock()
shutdownPlugin(p, pm.containerdClient)
}
}
}