Add image tag definition in buildrun spec

docs/buildrun.md

@@ -50,7 +50,7 @@ The `BuildRun` definition supports the following fields:
   - `spec.resources` - Refers to the compute [resources](https://kubernetes.io/docs/concepts/configuration/manage-compute-resources-container/) used on the container where the image is built.
   - `spec.serviceAccount` - Refers to the SA to use when building the image. (_defaults to the `default` SA_)
   - `spec.timeout` - Defines a custom timeout. The value needs to be parsable by [ParseDuration](https://golang.org/pkg/time/#ParseDuration), for example `5m`. The value overwrites the value that is defined in the `Build`.
-
+  - `spec.output.image` - Refers to a custom location where the generated image would be pushed. The value will overwrite the `output.image` value which is defined in `Build`.
 ### Defining the BuildRef
 
 A `BuildRun` resource can reference a `Build` resource, that indicates what image to build. For example:

pkg/apis/build/v1alpha1/buildrun_types.go

@@ -31,6 +31,11 @@ type BuildRunSpec struct {
 	// Timeout defines the maximum run time of this build run.
 	// +optional
 	Timeout *metav1.Duration `json:"timeout,omitempty"`
+
+	// Output refers to the location where the generated
+	// image would be pushed to. It will overwrite the output image in build spec
+	// +optional
+	Output *Image `json:"output,omitempty"`
 }
 
 // BuildRunStatus defines the observed state of BuildRun

pkg/controller/buildrun/generate_taskrun.go

@@ -170,6 +170,14 @@ func GenerateTaskRun(build *buildv1alpha1.Build, buildRun *buildv1alpha1.BuildRu
 		revision = *build.Spec.Source.Revision
 	}
 
+	// retrieve expected imageURL form build or buildRun
+	var ImageURL string
+	if buildRun.Spec.Output != nil {
+		ImageURL = buildRun.Spec.Output.ImageURL
+	} else {
+		ImageURL = build.Spec.Output.ImageURL
+	}
+
 	taskSpec, err := GenerateTaskSpec(build, buildRun, buildSteps)
 	if err != nil {
 		return nil, err
@@ -219,7 +227,7 @@ func GenerateTaskRun(build *buildv1alpha1.Build, buildRun *buildv1alpha1.BuildRu
 								Params: []taskv1.ResourceParam{
 									{
 										Name:  outputImageResourceURL,
-										Value: build.Spec.Output.ImageURL,
+										Value: ImageURL,
 									},
 								},
 							},

pkg/controller/buildrun/generate_taskrun_test.go

@@ -179,7 +179,7 @@ var _ = Describe("GenerateTaskrun", func() {
 		var (
 			k8sDuration30s                                                  *metav1.Duration
 			k8sDuration1m                                                   *metav1.Duration
-			namespace, contextDir, revision, outputPath, serviceAccountName string
+			namespace, contextDir, revision, outputPath, outputPathBuildRun, serviceAccountName string
 			got                                                             *v1beta1.TaskRun
 			err                                                             error
 		)
@@ -202,6 +202,7 @@ var _ = Describe("GenerateTaskrun", func() {
 				ImageURL: "heroku/buildpacks:18",
 			}
 			outputPath = "image-registry.openshift-image-registry.svc:5000/example/buildpacks-app"
+			outputPathBuildRun = "image-registry.openshift-image-registry.svc:5000/example/buildpacks-app-v2"
 			serviceAccountName = buildpacks + "-serviceaccount"
 		})
 
@@ -538,5 +539,95 @@ var _ = Describe("GenerateTaskrun", func() {
 				Expect(got.Spec.Timeout).To(Equal(k8sDuration1m))
 			})
 		})
+
+		Context("when the build and buildrun both contain an output imageURL", func() {
+			BeforeEach(func() {
+				build = &buildv1alpha1.Build{
+					ObjectMeta: metav1.ObjectMeta{
+						Name:      buildah,
+						Namespace: namespace,
+					},
+					Spec: buildv1alpha1.BuildSpec{
+						Source: buildv1alpha1.GitSource{
+							URL: url,
+						},
+						StrategyRef: &buildv1alpha1.StrategyRef{
+							Name: buildah,
+						},
+						Output: buildv1alpha1.Image{
+							ImageURL: outputPath,
+						},
+					},
+				}
+				buildRun = &buildv1alpha1.BuildRun{
+					ObjectMeta: metav1.ObjectMeta{
+						Name:      buildah + "-run",
+						Namespace: namespace,
+					},
+					Spec: buildv1alpha1.BuildRunSpec{
+						BuildRef: &buildv1alpha1.BuildRef{
+							Name: buildah,
+						},
+						Resources: &corev1.ResourceRequirements{
+							Limits: corev1.ResourceList{
+								corev1.ResourceCPU:    resource.MustParse("500m"),
+								corev1.ResourceMemory: resource.MustParse("2Gi"),
+							},
+							Requests: corev1.ResourceList{
+								corev1.ResourceCPU:    resource.MustParse("500m"),
+								corev1.ResourceMemory: resource.MustParse("2Gi"),
+							},
+						},
+						ServiceAccount: &buildv1alpha1.ServiceAccount{
+							Name: &serviceAccountName,
+						},
+						Output: &buildv1alpha1.Image{
+							ImageURL: outputPathBuildRun,
+						},
+					},
+				}
+				buildStrategy = &buildv1alpha1.BuildStrategy{
+					ObjectMeta: metav1.ObjectMeta{Name: buildah},
+					Spec: buildv1alpha1.BuildStrategySpec{
+						BuildSteps: []buildv1alpha1.BuildStep{
+							{
+								Container: corev1.Container{
+									Name:       "build",
+									Image:      "$(build.builder.image)",
+									WorkingDir: "/workspace/source",
+									Command: []string{
+										"buildah", "bud", "--tls-verify=false", "--layers", "-f", "$(build.dockerfile)", "-t", "$(build.output.image)", "$(build.pathContext)",
+									},
+									VolumeMounts: []corev1.VolumeMount{
+										{
+											Name:      "varlibcontainers",
+											MountPath: "/var/lib/containers",
+										},
+									},
+								},
+							},
+						},
+					},
+				}
+			})
+
+			JustBeforeEach(func() {
+				got, err = buildrunCtl.GenerateTaskRun(build, buildRun, serviceAccountName, buildStrategy.Spec.BuildSteps)
+				Expect(err).To(BeNil())
+			})
+
+			It("should use the imageURL from the BuildRun", func() {
+				outputResources := got.Spec.Resources.Outputs
+				for _, outputResource := range outputResources {
+					Expect(outputResource.ResourceSpec.Type).To(Equal(v1beta1.PipelineResourceTypeImage))
+					params := outputResource.ResourceSpec.Params
+					for _, param := range params {
+						if param.Name == "url" {
+							Expect(param.Value).To(Equal(outputPathBuildRun))
+						}
+					}
+				}
+			})
+		})
 	})
 })