cddfe04f6a
This enables docker cp and ADD/COPY docker build support for LCOW. Originally, the graphdriver.Get() interface returned a local path to the container root filesystem. This does not work for LCOW, so the Get() method now returns an interface that LCOW implements to support copying to and from the container. Signed-off-by: Akash Gupta <akagup@microsoft.com> Upstream-commit: 7a7357dae1bcccb17e9b2d4c7c8f5c025fce56ca Component: engine
48 lines
1.0 KiB
Go
48 lines
1.0 KiB
Go
package 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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