/
mounted_layer.go
52 lines (44 loc) · 994 Bytes
/
mounted_layer.go
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package layer
import "io"
type mountedLayer struct {
name string
mountID string
initID string
parent *roLayer
path string
layerStore *layerStore
activityCount int
}
func (ml *mountedLayer) cacheParent() string {
if ml.initID != "" {
return ml.initID
}
if ml.parent != nil {
return ml.parent.cacheID
}
return ""
}
func (ml *mountedLayer) TarStream() (io.ReadCloser, error) {
archiver, err := ml.layerStore.driver.Diff(ml.mountID, ml.cacheParent())
if err != nil {
return nil, err
}
return archiver, nil
}
func (ml *mountedLayer) Path() (string, error) {
if ml.path == "" {
return "", ErrNotMounted
}
return ml.path, nil
}
func (ml *mountedLayer) Parent() Layer {
if ml.parent != nil {
return ml.parent
}
// Return a nil interface instead of an interface wrapping a nil
// pointer.
return nil
}
func (ml *mountedLayer) Size() (int64, error) {
return ml.layerStore.driver.DiffSize(ml.mountID, ml.cacheParent())
}