Merge pull request #18878 from calavera/conditional_load_response

Make `docker load` to output json when the response content type is json.

client/image_load.go

@@ -3,15 +3,20 @@ package lib
 import (
 	"io"
 	"net/url"
+
+	"github.com/docker/docker/api/types"
 )
 
 // ImageLoad loads an image in the docker host from the client host.
 // It's up to the caller to close the io.ReadCloser returned by
 // this function.
-func (cli *Client) ImageLoad(input io.Reader) (io.ReadCloser, error) {
+func (cli *Client) ImageLoad(input io.Reader) (types.ImageLoadResponse, error) {
 	resp, err := cli.postRaw("/images/load", url.Values{}, input, nil)
 	if err != nil {
-		return nil, err
+		return types.ImageLoadResponse{}, err
 	}
-	return resp.body, nil
+	return types.ImageLoadResponse{
+		Body: resp.body,
+		JSON: resp.header.Get("Content-Type") == "application/json",
+	}, nil
 }

types/client.go

@@ -184,6 +184,12 @@ type ImageListOptions struct {
 	Filters   filters.Args
 }
 
+// ImageLoadResponse returns information to the client about a load process.
+type ImageLoadResponse struct {
+	Body io.ReadCloser
+	JSON bool
+}
+
 // ImagePullOptions holds information to pull images.
 type ImagePullOptions struct {
 	ImageID string