Add flag to skip pulling images already present

container/docker_images.go

@@ -0,0 +1,33 @@
+package container
+
+import (
+	"context"
+
+	"github.com/docker/docker/api/types"
+	"github.com/docker/docker/api/types/filters"
+	"github.com/docker/docker/client"
+)
+
+// ImageExistsLocally returns a boolean indicating if an image with the
+// requested name (and tag) exist in the local docker image store
+func ImageExistsLocally(ctx context.Context, imageName string) (bool, error) {
+	cli, err := client.NewClientWithOpts(client.FromEnv)
+	if err != nil {
+		return false, err
+	}
+	cli.NegotiateAPIVersion(ctx)
+
+	filters := filters.NewArgs()
+	filters.Add("reference", imageName)
+
+	imageListOptions := types.ImageListOptions{
+		Filters: filters,
+	}
+
+	images, err := cli.ImageList(ctx, imageListOptions)
+	if err != nil {
+		return false, err
+	}
+
+	return len(images) > 0, nil
+}