package graphdriver import ( "fmt" "io" "path/filepath" "github.com/docker/docker/pkg/plugingetter" "github.com/docker/docker/plugin/v2" ) type pluginClient interface { // Call calls the specified method with the specified arguments for the plugin. Call(string, interface{}, interface{}) error // Stream calls the specified method with the specified arguments for the plugin and returns the response IO stream Stream(string, interface{}) (io.ReadCloser, error) // SendFile calls the specified method, and passes through the IO stream SendFile(string, io.Reader, interface{}) error } func lookupPlugin(name string, pg plugingetter.PluginGetter, config Options) (Driver, error) { if !config.ExperimentalEnabled { return nil, fmt.Errorf("graphdriver plugins are only supported with experimental mode") } pl, err := pg.Get(name, "GraphDriver", plugingetter.Acquire) if err != nil { return nil, fmt.Errorf("Error looking up graphdriver plugin %s: %v", name, err) } return newPluginDriver(name, pl, config) } func newPluginDriver(name string, pl plugingetter.CompatPlugin, config Options) (Driver, error) { home := config.Root if !pl.IsV1() { if p, ok := pl.(*v2.Plugin); ok { if p.PropagatedMount != "" { home = p.PluginObj.Config.PropagatedMount } } } proxy := &graphDriverProxy{name, pl, Capabilities{}} return proxy, proxy.Init(filepath.Join(home, name), config.DriverOptions, config.UIDMaps, config.GIDMaps) }