a5a15c7782
Consider only images that were built `FROM scratch` as valid candidates for the `FROM scratch` + INSTRUCTION build step. The images are marked as `FROM scratch` based by the classic builder with a special label. It must be a new label instead of empty parent label, because empty label values are not persisted. Signed-off-by: Paweł Gronowski <pawel.gronowski@docker.com>
63 lines
1.7 KiB
Go
63 lines
1.7 KiB
Go
package containerd
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import (
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"context"
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containerdimages "github.com/containerd/containerd/images"
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"github.com/docker/docker/errdefs"
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"github.com/docker/docker/image"
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"github.com/opencontainers/go-digest"
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"github.com/pkg/errors"
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)
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// getImagesWithLabel returns all images that have the matching label key and value.
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func (i *ImageService) getImagesWithLabel(ctx context.Context, labelKey string, labelValue string) ([]image.ID, error) {
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imgs, err := i.images.List(ctx, "labels."+labelKey+"=="+labelValue)
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if err != nil {
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return []image.ID{}, errdefs.System(errors.Wrap(err, "failed to list all images"))
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}
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var children []image.ID
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for _, img := range imgs {
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children = append(children, image.ID(img.Target.Digest))
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}
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return children, nil
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}
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// Children returns a slice of image IDs that are children of the `id` image
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func (i *ImageService) Children(ctx context.Context, id image.ID) ([]image.ID, error) {
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return i.getImagesWithLabel(ctx, imageLabelClassicBuilderParent, string(id))
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}
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// parents returns a slice of image IDs that are parents of the `id` image
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//
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// Called from image_delete.go to prune dangling parents.
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func (i *ImageService) parents(ctx context.Context, id image.ID) ([]containerdimages.Image, error) {
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targetImage, err := i.resolveImage(ctx, id.String())
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if err != nil {
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return nil, errors.Wrap(err, "failed to get child image")
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}
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var imgs []containerdimages.Image
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for {
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parent, ok := targetImage.Labels[imageLabelClassicBuilderParent]
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if !ok || parent == "" {
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break
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}
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parentDigest, err := digest.Parse(parent)
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if err != nil {
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return nil, err
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}
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img, err := i.resolveImage(ctx, parentDigest.String())
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if err != nil {
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return nil, err
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}
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imgs = append(imgs, img)
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targetImage = img
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}
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return imgs, nil
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}
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