Fix docker load progressbar, fixes #21957

Signed-off-by: Lei Jitang <leijitang@huawei.com>

api/client/load.go

@@ -41,7 +41,7 @@ func (cli *DockerCli) CmdLoad(args ...string) error {
 	}
 	defer response.Body.Close()
 
-	if response.JSON {
+	if response.Body != nil && response.JSON {
 		return jsonmessage.DisplayJSONMessagesStream(response.Body, cli.out, cli.outFd, cli.isTerminalOut, nil)
 	}
 

api/server/router/image/image_routes.go

@@ -206,7 +206,17 @@ func (s *imageRouter) postImagesLoad(ctx context.Context, w http.ResponseWriter,
 		return err
 	}
 	quiet := httputils.BoolValueOrDefault(r, "quiet", true)
+
+	if !quiet {
 		w.Header().Set("Content-Type", "application/json")
+
+		output := ioutils.NewWriteFlusher(w)
+		defer output.Close()
+		if err := s.backend.LoadImage(r.Body, output, quiet); err != nil {
+			output.Write(streamformatter.NewJSONStreamFormatter().FormatError(err))
+		}
+		return nil
+	}
 	return s.backend.LoadImage(r.Body, w, quiet)
 }
 

image/tarexport/load.go

@@ -29,6 +29,7 @@ func (l *tarexporter) Load(inTar io.ReadCloser, outStream io.Writer, quiet bool)
 	)
 	if !quiet {
 		progressOutput = sf.NewProgressOutput(outStream, false)
+		outStream = &streamformatter.StdoutFormatter{Writer: outStream, StreamFormatter: streamformatter.NewJSONStreamFormatter()}
 	}
 
 	tmpDir, err := ioutil.TempDir("", "docker-import-")

integration-cli/docker_cli_save_load_unix_test.go

@@ -3,6 +3,7 @@
 package main
 
 import (
+	"fmt"
 	"io/ioutil"
 	"os"
 	"os/exec"
@@ -65,3 +66,22 @@ func (s *DockerSuite) TestSaveAndLoadRepoStdout(c *check.C) {
 	c.Assert(err, check.IsNil) //could not read tty output
 	c.Assert(string(buf[:n]), checker.Contains, "Cowardly refusing", check.Commentf("help output is not being yielded", out))
 }
+
+func (s *DockerSuite) TestSaveAndLoadWithProgressBar(c *check.C) {
+	name := "test-load"
+	_, err := buildImage(name, `
+	FROM busybox
+	RUN touch aa
+	`, true)
+	c.Assert(err, check.IsNil)
+
+	tmptar := name + ".tar"
+	dockerCmd(c, "save", "-o", tmptar, name)
+	defer os.Remove(tmptar)
+
+	dockerCmd(c, "rmi", name)
+	dockerCmd(c, "tag", "busybox", name)
+	out, _ := dockerCmd(c, "load", "-i", tmptar)
+	expected := fmt.Sprintf("The image %s:latest already exists, renaming the old one with ID", name)
+	c.Assert(out, checker.Contains, expected)
+}