Don't override sidecar tolerations

go/tasks/plugins/k8s/sidecar/sidecar.go

@@ -29,7 +29,7 @@ type sidecarResourceHandler struct{}
 
 // This method handles templatizing primary container input args, env variables and adds a GPU toleration to the pod
 // spec if necessary.
-func validateAndFinalizeContainers(
+func validateAndFinalizePod(
 	ctx context.Context, taskCtx pluginsCore.TaskExecutionContext, primaryContainerName string, pod k8sv1.Pod) (*k8sv1.Pod, error) {
 	var hasPrimaryContainer bool
 
@@ -61,7 +61,11 @@ func validateAndFinalizeContainers(
 
 	}
 	pod.Spec.Containers = finalizedContainers
-	pod.Spec.Tolerations = flytek8s.GetPodTolerations(taskCtx.TaskExecutionMetadata().IsInterruptible(), resReqs...)
+	if pod.Spec.Tolerations == nil {
+		pod.Spec.Tolerations = make([]k8sv1.Toleration, 0)
+	}
+	pod.Spec.Tolerations = append(
+		flytek8s.GetPodTolerations(taskCtx.TaskExecutionMetadata().IsInterruptible(), resReqs...), pod.Spec.Tolerations...)
 	if taskCtx.TaskExecutionMetadata().IsInterruptible() && len(config.GetK8sPluginConfig().InterruptibleNodeSelector) > 0 {
 		pod.Spec.NodeSelector = config.GetK8sPluginConfig().InterruptibleNodeSelector
 	}
@@ -90,7 +94,7 @@ func (sidecarResourceHandler) BuildResource(ctx context.Context, taskCtx plugins
 	// We want to Also update the serviceAccount to the serviceaccount of the workflow
 	pod.Spec.ServiceAccountName = taskCtx.TaskExecutionMetadata().GetK8sServiceAccount()
 
-	pod, err = validateAndFinalizeContainers(ctx, taskCtx, sidecarJob.PrimaryContainerName, *pod)
+	pod, err = validateAndFinalizePod(ctx, taskCtx, sidecarJob.PrimaryContainerName, *pod)
 	if err != nil {
 		return nil, err
 	}

go/tasks/plugins/k8s/sidecar/sidecar_test.go

@@ -170,6 +170,29 @@ func TestBuildSidecarResource(t *testing.T) {
 	actualGpuLimit, ok := res.(*v1.Pod).Spec.Containers[0].Resources.Limits[ResourceNvidiaGPU]
 	assert.True(t, ok)
 	assert.True(t, expectedGpuLimit.Equal(actualGpuLimit))
+
+	// Assert volumes & volume mounts are preserved
+	assert.Len(t, res.(*v1.Pod).Spec.Volumes, 1)
+	assert.Equal(t, "dshm", res.(*v1.Pod).Spec.Volumes[0].Name)
+
+	assert.Len(t, res.(*v1.Pod).Spec.Containers[0].VolumeMounts, 1)
+	assert.Equal(t, "volume mount", res.(*v1.Pod).Spec.Containers[0].VolumeMounts[0].Name)
+
+	// Assert user-specified tolerations don't get overridden
+	assert.Len(t, res.(*v1.Pod).Spec.Tolerations, 2)
+	expectedTolerations := []v1.Toleration{
+		{
+			Key:      "flyte/gpu",
+			Operator: "Equal",
+			Value:    "dedicated",
+			Effect:   "NoSchedule",
+		},
+		{
+			Key:   "my toleration key",
+			Value: "my toleration value",
+		},
+	}
+	assert.EqualValues(t, expectedTolerations, res.(*v1.Pod).Spec.Tolerations)
 }
 
 func TestBuildSidecarResourceMissingPrimary(t *testing.T) {

go/tasks/plugins/k8s/sidecar/testdata/sidecar_custom

@@ -56,7 +56,11 @@
 				}
 			},
 			"name": "dshm"
-		}]
+		}],
+		"tolerations": [{
+		    "key": "my toleration key",
+		    "value": "my toleration value"
+        }]
 	},
 	"primaryContainerName": "a container"
 }