Onpy copy output resource to PVC for storage/git output

At the moment the output_resource module unconditionally adds a
copy step for every output resource in the taskrun.
However not every output resource will generate content to be
copied. Limit the copy to Storage and Git outoputs for now.

This is meant as a hotfix for bug #401 until an implementation
of the image output resource is available via #216. Until
image resource output is implemented, any consumer won't
have guarantee that the image has been actually built and pushed,
and won't know the hash of the created image.

pkg/reconciler/v1alpha1/taskrun/resources/output_resource.go

@@ -105,27 +105,34 @@ func AddOutputResources(
 			}
 		}
 
-		// copy to pvc if pvc is present
-		if pipelineRunpvcName != "" {
-			var newSteps []corev1.Container
-			for _, dPath := range boundResource.Paths {
-				newSteps = append(newSteps, []corev1.Container{{
-					Name:  fmt.Sprintf("source-mkdir-%s", resource.GetName()),
-					Image: *bashNoopImage,
-					Args: []string{
-						"-args", strings.Join([]string{"mkdir", "-p", dPath}, " "),
-					},
-					VolumeMounts: []corev1.VolumeMount{getPvcMount(pipelineRunpvcName)},
-				}, {
-					Name:  fmt.Sprintf("source-copy-%s", resource.GetName()),
-					Image: *bashNoopImage,
-					Args: []string{
-						"-args", strings.Join([]string{"cp", "-r", fmt.Sprintf("%s/.", sourcePath), dPath}, " "),
-					},
-					VolumeMounts: []corev1.VolumeMount{getPvcMount(pipelineRunpvcName)},
-				}}...)
-			}
-			b.Spec.Steps = append(b.Spec.Steps, newSteps...)
+		// Workaround for issue #401. Unless all resource types are implemented as
+		// outputs, or until we have metadata on the resource that declares whether
+		// the output should be copied to the PVC, only copy git and storage output
+		// resources.
+		if (resource.Spec.Type == v1alpha1.PipelineResourceTypeStorage ||
+			resource.Spec.Type == v1alpha1.PipelineResourceTypeGit) {
+				// copy to pvc if pvc is present
+				if pipelineRunpvcName != "" {
+					var newSteps []corev1.Container
+					for _, dPath := range boundResource.Paths {
+						newSteps = append(newSteps, []corev1.Container{{
+							Name:  fmt.Sprintf("source-mkdir-%s", resource.GetName()),
+							Image: *bashNoopImage,
+							Args: []string{
+								"-args", strings.Join([]string{"mkdir", "-p", dPath}, " "),
+							},
+							VolumeMounts: []corev1.VolumeMount{getPvcMount(pipelineRunpvcName)},
+						}, {
+							Name:  fmt.Sprintf("source-copy-%s", resource.GetName()),
+							Image: *bashNoopImage,
+							Args: []string{
+								"-args", strings.Join([]string{"cp", "-r", fmt.Sprintf("%s/.", sourcePath), dPath}, " "),
+							},
+							VolumeMounts: []corev1.VolumeMount{getPvcMount(pipelineRunpvcName)},
+						}}...)
+					}
+					b.Spec.Steps = append(b.Spec.Steps, newSteps...)
+				}
 		}
 	}