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//go:build !remote
package libimage
import (
"context"
"fmt"
"time"
)
// 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.newFreshLayerTree()
if err != nil {
return nil, err
}
var nextNode *layerNode
if i.TopLayer() != "" {
layer, err := i.runtime.store.Layer(i.TopLayer())
if err != nil {
return nil, err
}
nextNode = layerTree.node(layer.ID)
}
// Iterate in reverse order over the history entries, and lookup the
// corresponding image ID, size. If it's a non-empty history entry,
// pick the next "storage" layer by walking the layer tree.
var allHistory []ImageHistory
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 nextNode != nil && len(nextNode.images) > 0 {
id := nextNode.images[0].ID() // always use the first one
if _, used := usedIDs[id]; !used {
history.ID = id
usedIDs[id] = true
}
for i := range nextNode.images {
history.Tags = append(history.Tags, nextNode.images[i].Names()...)
}
}
if !ociImage.History[x].EmptyLayer {
if nextNode == nil { // If no layer's left, something's wrong.
return nil, fmt.Errorf("no layer left for non-empty history entry: %v", history)
}
history.Size = nextNode.layer.UncompressedSize
nextNode = nextNode.parent
}
allHistory = append(allHistory, history)
}
return allHistory, nil
}
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