dotcloud/docker

package specialimage

import (
    "github.com/containerd/platforms"
    "github.com/distribution/reference"
    ocispec "github.com/opencontainers/image-spec/specs-go/v1"
)

// ConfigTarget creates an image index with an image config being used as an
// image target instead of a manifest or index.
func ConfigTarget(dir string) (*ocispec.Index, error) {
    const imageRef = "config:latest"

    ref, err := reference.ParseNormalizedNamed(imageRef)
    if err != nil {
        return nil, err
    }

    desc, err := writeJsonBlob(dir, ocispec.MediaTypeImageConfig, ocispec.Image{
        Platform: platforms.MustParse("linux/amd64"),
        Config: ocispec.ImageConfig{
            Env: []string{"FOO=BAR"},
        },
    })
    if err != nil {
        return nil, err
    }
    desc.Annotations = map[string]string{
        "io.containerd.image.name": ref.String(),
    }

    return ociImage(dir, ref, desc)
}