Allow build to specify node selectors

pkg/apis/build/v1alpha1/build_types.go

@@ -65,6 +65,12 @@ type BuildSpec struct {
 	// populate fields in the build, and optional Arguments to pass to the
 	// template.
 	Template *TemplateInstantiationSpec `json:"template,omitempty"`
+
+	// NodeSelector is a selector which must be true for the pod to fit on a node.
+	// Selector which must match a node's labels for the pod to be scheduled on that node.
+	// More info: https://kubernetes.io/docs/concepts/configuration/assign-pod-node/
+	// +optional
+	NodeSelector map[string]string `json:"nodeSelector,omitempty"`
 }
 
 // TemplateInstantiationSpec specifies how a BuildTemplate is instantiated into

pkg/builder/cluster/convert/convert.go

@@ -333,6 +333,7 @@ func FromCRD(build *v1alpha1.Build, kubeclient kubernetes.Interface) (*corev1.Po
 			Containers:         []corev1.Container{nopContainer},
 			ServiceAccountName: build.Spec.ServiceAccountName,
 			Volumes:            volumes,
+			NodeSelector:       build.Spec.NodeSelector,
 		},
 	}, nil
 }
@@ -450,6 +451,7 @@ func ToCRD(pod *corev1.Pod) (*v1alpha1.Build, error) {
 			Steps:              steps,
 			ServiceAccountName: podSpec.ServiceAccountName,
 			Volumes:            volumes,
+			NodeSelector:       podSpec.NodeSelector,
 		},
 	}, nil
 }

pkg/builder/cluster/convert/convert_test.go

@@ -46,6 +46,7 @@ func TestParsing(t *testing.T) {
 		"testdata/security-context.yaml",
 		"testdata/volumes.yaml",
 		"testdata/custom-source.yaml",
+		"testdata/nodeselector.yaml",
 
 		"testdata/git-revision.yaml",
 

pkg/builder/cluster/convert/testdata/nodeselector.yaml

@@ -0,0 +1,19 @@
+# Copyright 2018 The Knative Authors
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+steps:
+- name: helloworld
+  image: gcr.io/google-containers/busybox
+  args: ["echo Hello World!"]
+nodeSelector:
+  disktype: ssd