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