github.com/Prakhar-Agarwal-byte/moby@v0.0.0-20231027092010-a14e3e8ab87e/daemon/images/image_history.go (about)

     1  package images // import "github.com/Prakhar-Agarwal-byte/moby/daemon/images"
     2  
     3  import (
     4  	"context"
     5  	"fmt"
     6  	"time"
     7  
     8  	"github.com/Prakhar-Agarwal-byte/moby/api/types/image"
     9  	"github.com/Prakhar-Agarwal-byte/moby/layer"
    10  	"github.com/distribution/reference"
    11  )
    12  
    13  // ImageHistory returns a slice of ImageHistory structures for the specified image
    14  // name by walking the image lineage.
    15  func (i *ImageService) ImageHistory(ctx context.Context, name string) ([]*image.HistoryResponseItem, error) {
    16  	start := time.Now()
    17  	img, err := i.GetImage(ctx, name, image.GetImageOpts{})
    18  	if err != nil {
    19  		return nil, err
    20  	}
    21  
    22  	history := []*image.HistoryResponseItem{}
    23  
    24  	layerCounter := 0
    25  	rootFS := *img.RootFS
    26  	rootFS.DiffIDs = nil
    27  
    28  	for _, h := range img.History {
    29  		var layerSize int64
    30  
    31  		if !h.EmptyLayer {
    32  			if len(img.RootFS.DiffIDs) <= layerCounter {
    33  				return nil, fmt.Errorf("too many non-empty layers in History section")
    34  			}
    35  			rootFS.Append(img.RootFS.DiffIDs[layerCounter])
    36  			l, err := i.layerStore.Get(rootFS.ChainID())
    37  			if err != nil {
    38  				return nil, err
    39  			}
    40  			layerSize = l.DiffSize()
    41  			layer.ReleaseAndLog(i.layerStore, l)
    42  			layerCounter++
    43  		}
    44  
    45  		history = append([]*image.HistoryResponseItem{{
    46  			ID:        "<missing>",
    47  			Created:   h.Created.Unix(),
    48  			CreatedBy: h.CreatedBy,
    49  			Comment:   h.Comment,
    50  			Size:      layerSize,
    51  		}}, history...)
    52  	}
    53  
    54  	// Fill in image IDs and tags
    55  	histImg := img
    56  	id := img.ID()
    57  	for _, h := range history {
    58  		h.ID = id.String()
    59  
    60  		var tags []string
    61  		for _, r := range i.referenceStore.References(id.Digest()) {
    62  			if _, ok := r.(reference.NamedTagged); ok {
    63  				tags = append(tags, reference.FamiliarString(r))
    64  			}
    65  		}
    66  
    67  		h.Tags = tags
    68  
    69  		id = histImg.Parent
    70  		if id == "" {
    71  			break
    72  		}
    73  		histImg, err = i.GetImage(ctx, id.String(), image.GetImageOpts{})
    74  		if err != nil {
    75  			break
    76  		}
    77  	}
    78  	imageActions.WithValues("history").UpdateSince(start)
    79  	return history, nil
    80  }