Fix docker remover an image show misleading conflicts

due to its dependency is tagged to multiple repositories

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

daemon/image_delete.go

@@ -70,7 +70,7 @@ func (daemon *Daemon) DeleteImage(eng *engine.Engine, name string, imgs *engine.
 				if parsedTag != "" {
 					tags = append(tags, parsedTag)
 				}
-			} else if repoName != parsedRepo && !force {
+			} else if repoName != parsedRepo && !force && first {
 				// the id belongs to multiple repos, like base:latest and user:test,
 				// in that case return conflict
 				return fmt.Errorf("Conflict, cannot delete image %s because it is tagged in multiple repositories, use -f to force", name)

integration-cli/docker_cli_rmi_test.go

@@ -124,3 +124,36 @@ MAINTAINER foo`)
 
 	logDone("rmi - force delete with existing containers")
 }
+
+func TestRmiWithMultipleRepositories(t *testing.T) {
+	defer deleteAllContainers()
+	newRepo := "127.0.0.1:5000/busybox"
+	oldRepo := "busybox"
+	newTag := "busybox:test"
+	cmd := exec.Command(dockerBinary, "tag", oldRepo, newRepo)
+	out, _, err := runCommandWithOutput(cmd)
+	if err != nil {
+		t.Fatalf("Could not tag busybox: %v: %s", err, out)
+	}
+	cmd = exec.Command(dockerBinary, "run", "--name", "test", oldRepo, "touch", "/home/abcd")
+	out, _, err = runCommandWithOutput(cmd)
+	if err != nil {
+		t.Fatalf("failed to run container: %v, output: %s", err, out)
+	}
+	cmd = exec.Command(dockerBinary, "commit", "test", newTag)
+	out, _, err = runCommandWithOutput(cmd)
+	if err != nil {
+		t.Fatalf("failed to commit container: %v, output: %s", err, out)
+	}
+	cmd = exec.Command(dockerBinary, "rmi", newTag)
+	out, _, err = runCommandWithOutput(cmd)
+	if err != nil {
+		t.Fatalf("failed to remove image: %v, output: %s", err, out)
+	}
+	if !strings.Contains(out, "Untagged: "+newTag) {
+		t.Fatalf("Could not remove image %s: %s, %v", newTag, out, err)
+	}
+
+	logDone("rmi - delete a image which its dependency tagged to multiple repositories success")
+
+}