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