dotcloud/docker

package images // import "github.com/docker/docker/daemon/images"

import (
    "context"

    "github.com/docker/docker/api/types/backend"
    "github.com/docker/docker/api/types/events"
)

// LogImageEvent generates an event related to an image with only the default attributes.
func (i *ImageService) LogImageEvent(imageID, refName string, action events.Action) {
    ctx := context.TODO()
    attributes := map[string]string{}

    img, err := i.GetImage(ctx, imageID, backend.GetImageOpts{})
    if err == nil && img.Config != nil {
        // image has not been removed yet.
        // it could be missing if the event is `delete`.
        copyAttributes(attributes, img.Config.Labels)
    }
    if refName != "" {
        attributes["name"] = refName
    }
    i.eventsService.Log(action, events.ImageEventType, events.Actor{
        ID:         imageID,
        Attributes: attributes,
    })
}

// copyAttributes guarantees that labels are not mutated by event triggers.
func copyAttributes(attributes, labels map[string]string) {
    if labels == nil {
        return
    }
    for k, v := range labels {
        attributes[k] = v
    }
}