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package layer // import "github.com/docker/docker/layer"
import (
"errors"
)
// Getter is an interface to get the path to a layer on the host.
type Getter interface {
// GetLayerPath gets the path for the layer. This is different from Get()
// since that returns an interface to account for unmountable layers.
GetLayerPath(id string) (string, error)
}
// GetLayerPath returns the path to a layer
func GetLayerPath(s Store, layer ChainID) (string, error) {
ls, ok := s.(*layerStore)
if !ok {
return "", errors.New("unsupported layer store")
}
ls.layerL.Lock()
defer ls.layerL.Unlock()
rl, ok := ls.layerMap[layer]
if !ok {
return "", ErrLayerDoesNotExist
}
if layerGetter, ok := ls.driver.(Getter); ok {
return layerGetter.GetLayerPath(rl.cacheID)
}
path, err := ls.driver.Get(rl.cacheID, "")
if err != nil {
return "", err
}
if err := ls.driver.Put(rl.cacheID); err != nil {
return "", err
}
return path.Path(), nil
}
func (ls *layerStore) mountID(name string) string {
// windows has issues if container ID doesn't match mount ID
return name
}
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