f8791db4be
Show dangling images in `docker image ls` output. Signed-off-by: Paweł Gronowski <pawel.gronowski@docker.com>
65 lines
2.2 KiB
Go
65 lines
2.2 KiB
Go
package containerd
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import (
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"context"
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cerrdefs "github.com/containerd/containerd/errdefs"
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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/opencontainers/go-digest"
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"github.com/pkg/errors"
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)
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// softImageDelete deletes the image, making sure that there are other images
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// that reference the content of the deleted image.
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// If no other image exists, a dangling one is created.
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func (i *ImageService) softImageDelete(ctx context.Context, img containerdimages.Image) error {
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is := i.client.ImageService()
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// If the image already exists, persist it as dangling image
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// but only if no other image has the same target.
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digest := img.Target.Digest.String()
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imgs, err := is.List(ctx, "target.digest=="+digest)
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if err != nil {
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return errdefs.System(errors.Wrapf(err, "failed to check if there are images targeting digest %s", digest))
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}
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// From this point explicitly ignore the passed context
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// and don't allow to interrupt operation in the middle.
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// Create dangling image if this is the last image pointing to this target.
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if len(imgs) == 1 {
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danglingImage := img
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danglingImage.Name = danglingImageName(img.Target.Digest)
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delete(danglingImage.Labels, "io.containerd.image.name")
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delete(danglingImage.Labels, "org.opencontainers.image.ref.name")
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_, err = is.Create(context.Background(), danglingImage)
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// Error out in case we couldn't persist the old image.
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// If it already exists, then just continue.
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if err != nil && !cerrdefs.IsAlreadyExists(err) {
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return errdefs.System(errors.Wrapf(err, "failed to create a dangling image for the replaced image %s with digest %s",
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danglingImage.Name, danglingImage.Target.Digest.String()))
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}
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}
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// Free the target name.
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err = is.Delete(context.Background(), img.Name)
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if err != nil {
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if !cerrdefs.IsNotFound(err) {
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return errdefs.System(errors.Wrapf(err, "failed to delete image %s which existed a moment before", img.Name))
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}
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}
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return nil
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}
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func danglingImageName(digest digest.Digest) string {
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return "moby-dangling@" + digest.String()
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}
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func isDanglingImage(image containerdimages.Image) bool {
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return image.Name == danglingImageName(image.Target.Digest)
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}
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