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