github.com/moby/docker@v26.1.3+incompatible/daemon/containerd/image_children.go (about)

     1  package containerd
     2  
     3  import (
     4  	"context"
     5  
     6  	containerdimages "github.com/containerd/containerd/images"
     7  	"github.com/docker/docker/errdefs"
     8  	"github.com/docker/docker/image"
     9  	"github.com/opencontainers/go-digest"
    10  	"github.com/pkg/errors"
    11  )
    12  
    13  // getImagesWithLabel returns all images that have the matching label key and value.
    14  func (i *ImageService) getImagesWithLabel(ctx context.Context, labelKey string, labelValue string) ([]image.ID, error) {
    15  	imgs, err := i.images.List(ctx, "labels."+labelKey+"=="+labelValue)
    16  
    17  	if err != nil {
    18  		return []image.ID{}, errdefs.System(errors.Wrap(err, "failed to list all images"))
    19  	}
    20  
    21  	var children []image.ID
    22  	for _, img := range imgs {
    23  		children = append(children, image.ID(img.Target.Digest))
    24  	}
    25  
    26  	return children, nil
    27  }
    28  
    29  // Children returns a slice of image IDs that are children of the `id` image
    30  func (i *ImageService) Children(ctx context.Context, id image.ID) ([]image.ID, error) {
    31  	return i.getImagesWithLabel(ctx, imageLabelClassicBuilderParent, string(id))
    32  }
    33  
    34  // parents returns a slice of image IDs that are parents of the `id` image
    35  //
    36  // Called from image_delete.go to prune dangling parents.
    37  func (i *ImageService) parents(ctx context.Context, id image.ID) ([]containerdimages.Image, error) {
    38  	targetImage, err := i.resolveImage(ctx, id.String())
    39  	if err != nil {
    40  		return nil, errors.Wrap(err, "failed to get child image")
    41  	}
    42  
    43  	var imgs []containerdimages.Image
    44  	for {
    45  		parent, ok := targetImage.Labels[imageLabelClassicBuilderParent]
    46  		if !ok || parent == "" {
    47  			break
    48  		}
    49  
    50  		parentDigest, err := digest.Parse(parent)
    51  		if err != nil {
    52  			return nil, err
    53  		}
    54  		img, err := i.resolveImage(ctx, parentDigest.String())
    55  		if err != nil {
    56  			return nil, err
    57  		}
    58  		imgs = append(imgs, img)
    59  		targetImage = img
    60  	}
    61  
    62  	return imgs, nil
    63  }