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package libpod
import (
"github.com/containers/storage/pkg/archive"
"github.com/pkg/errors"
"github.com/projectatomic/libpod/libpod/layers"
)
// GetDiff returns the differences between the two images, layers, or containers
func (r *Runtime) GetDiff(from, to string) ([]archive.Change, error) {
toLayer, err := r.getLayerID(to)
if err != nil {
return nil, err
}
fromLayer := ""
if from != "" {
fromLayer, err = r.getLayerID(from)
if err != nil {
return nil, err
}
}
return r.store.Changes(fromLayer, toLayer)
}
// GetLayerID gets a full layer id given a full or partial id
// If the id matches a container or image, the id of the top layer is returned
// If the id matches a layer, the top layer id is returned
func (r *Runtime) getLayerID(id string) (string, error) {
var toLayer string
toImage, err := r.GetImage(id)
if err != nil {
toCtr, err := r.store.Container(id)
if err != nil {
toLayer, err = layers.FullID(r.store, id)
if err != nil {
return "", errors.Errorf("layer, image, or container %s does not exist", id)
}
} else {
toLayer = toCtr.LayerID
}
} else {
toLayer = toImage.TopLayer
}
return toLayer, nil
}
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