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aa96c3176b
This allows graphdrivers to declare that they can reproduce the original diff stream for a layer. If they do so, the layer store will not use tar-split processing, but will still verify the digest on layer export. This makes it easier to experiment with non-default diff formats. Signed-off-by: Alfred Landrum <alfred.landrum@docker.com>
43 lines
1.4 KiB
Go
43 lines
1.4 KiB
Go
package graphdriver
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import (
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"fmt"
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"io"
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"path/filepath"
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"github.com/docker/docker/pkg/plugingetter"
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"github.com/docker/docker/plugin/v2"
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)
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type pluginClient interface {
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// Call calls the specified method with the specified arguments for the plugin.
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Call(string, interface{}, interface{}) error
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// Stream calls the specified method with the specified arguments for the plugin and returns the response IO stream
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Stream(string, interface{}) (io.ReadCloser, error)
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// SendFile calls the specified method, and passes through the IO stream
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SendFile(string, io.Reader, interface{}) error
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}
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func lookupPlugin(name string, pg plugingetter.PluginGetter, config Options) (Driver, error) {
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if !config.ExperimentalEnabled {
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return nil, fmt.Errorf("graphdriver plugins are only supported with experimental mode")
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}
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pl, err := pg.Get(name, "GraphDriver", plugingetter.Acquire)
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if err != nil {
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return nil, fmt.Errorf("Error looking up graphdriver plugin %s: %v", name, err)
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}
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return newPluginDriver(name, pl, config)
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}
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func newPluginDriver(name string, pl plugingetter.CompatPlugin, config Options) (Driver, error) {
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home := config.Root
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if !pl.IsV1() {
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if p, ok := pl.(*v2.Plugin); ok {
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if p.PropagatedMount != "" {
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home = p.PluginObj.Config.PropagatedMount
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}
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}
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}
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proxy := &graphDriverProxy{name, pl, Capabilities{}}
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return proxy, proxy.Init(filepath.Join(home, name), config.DriverOptions, config.UIDMaps, config.GIDMaps)
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}
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