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moby--moby/daemon/graphdriver/plugin.go

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package graphdriver
import (
"fmt"
"io"
"path/filepath"
"github.com/docker/docker/pkg/plugingetter"
)
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, home string, opts []string, pg plugingetter.PluginGetter) (Driver, error) {
pl, err := pg.Get(name, "GraphDriver", plugingetter.LOOKUP)
if err != nil {
return nil, fmt.Errorf("Error looking up graphdriver plugin %s: %v", name, err)
}
return newPluginDriver(name, home, opts, pl)
}
func newPluginDriver(name, home string, opts []string, pl plugingetter.CompatPlugin) (Driver, error) {
proxy := &graphDriverProxy{name, pl.Client(), pl}
return proxy, proxy.Init(filepath.Join(home, name), opts)
}