81 lines
2.0 KiB
Go
81 lines
2.0 KiB
Go
package libimage
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import (
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"context"
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"time"
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"github.com/containers/storage"
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)
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// ImageHistory contains the history information of an image.
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type ImageHistory struct {
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ID string `json:"id"`
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Created *time.Time `json:"created"`
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CreatedBy string `json:"createdBy"`
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Size int64 `json:"size"`
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Comment string `json:"comment"`
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Tags []string `json:"tags"`
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}
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// History computes the image history of the image including all of its parents.
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func (i *Image) History(ctx context.Context) ([]ImageHistory, error) {
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ociImage, err := i.toOCI(ctx)
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if err != nil {
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return nil, err
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}
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layerTree, err := i.runtime.layerTree()
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if err != nil {
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return nil, err
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}
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var allHistory []ImageHistory
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var layer *storage.Layer
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if i.TopLayer() != "" {
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layer, err = i.runtime.store.Layer(i.TopLayer())
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if err != nil {
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return nil, err
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}
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}
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// Iterate in reverse order over the history entries, and lookup the
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// corresponding image ID, size and get the next later if needed.
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numHistories := len(ociImage.History) - 1
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usedIDs := make(map[string]bool) // prevents assigning images IDs more than once
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for x := numHistories; x >= 0; x-- {
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history := ImageHistory{
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ID: "<missing>", // may be overridden below
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Created: ociImage.History[x].Created,
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CreatedBy: ociImage.History[x].CreatedBy,
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Comment: ociImage.History[x].Comment,
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}
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if layer != nil {
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history.Tags = layer.Names
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if !ociImage.History[x].EmptyLayer {
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history.Size = layer.UncompressedSize
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}
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// Query the layer tree if it's the top layer of an
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// image.
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node := layerTree.node(layer.ID)
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if len(node.images) > 0 {
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id := node.images[0].ID() // always use the first one
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if _, used := usedIDs[id]; !used {
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history.ID = id
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usedIDs[id] = true
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}
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}
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if layer.Parent != "" && !ociImage.History[x].EmptyLayer {
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layer, err = i.runtime.store.Layer(layer.Parent)
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if err != nil {
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return nil, err
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}
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}
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}
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allHistory = append(allHistory, history)
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}
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return allHistory, nil
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}
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