Initial commit

server/docker/image.go

@@ -0,0 +1,41 @@
+package docker
+
+import (
+	"context"
+	"github.com/docker/docker/api/types"
+	"github.com/docker/docker/api/types/filters"
+	"github.com/docker/docker/client"
+	"io"
+)
+
+type Image struct {
+	ref string
+}
+
+func (i Image) Ref() string {
+	return i.ref
+}
+
+// NewImage creates a new Image instance
+func NewImage(ctx context.Context, cli *client.Client, ref string) (Image, io.ReadCloser, error) {
+	summary, err := cli.ImageList(ctx, types.ImageListOptions{
+		Filters: filters.NewArgs(filters.Arg("reference", ref)),
+	})
+	if err != nil {
+		return Image{}, nil, err
+	}
+
+	if len(summary) > 0 {
+		return Image{
+			ref: ref,
+		}, nil, nil
+	} else {
+		out, err := cli.ImagePull(ctx, ref, types.ImagePullOptions{})
+		if err != nil {
+			return Image{}, nil, err
+		}
+		return Image{
+			ref: ref,
+		}, out, nil
+	}
+}