Add a command/bin to generate the CRDs as yaml

Makefile

@@ -16,6 +16,9 @@ build: promu
 short-build:
 	go install github.com/coreos/prometheus-operator/cmd/operator
 
+crdgen:
+	go install github.com/coreos/prometheus-operator/cmd/po-crdgen
+
 crossbuild: promu
 	@$(PROMU) crossbuild
 

cmd/po-crdgen/crdgen.go

@@ -0,0 +1,53 @@
+package main
+
+import (
+	"encoding/json"
+	"fmt"
+	monitoringv1 "github.com/coreos/prometheus-operator/pkg/client/monitoring/v1"
+	k8sutil "github.com/coreos/prometheus-operator/pkg/k8sutil"
+	prometheus "github.com/coreos/prometheus-operator/pkg/prometheus"
+	"github.com/ghodss/yaml"
+	extensionsobj "k8s.io/apiextensions-apiserver/pkg/apis/apiextensions/v1beta1"
+
+	"os"
+)
+
+// Config stores the user configuration input
+type Config struct {
+	EnableValidation bool
+	Namespace        string
+	Labels           prometheus.Labels
+	CrdGroup         string
+	CrdKinds         monitoringv1.CrdKinds
+}
+
+func marshallCrd(crd *extensionsobj.CustomResourceDefinition, encode string) {
+	jsonBytes, err := json.MarshalIndent(crd, "", "    ")
+	if err != nil {
+		fmt.Println("error:", err)
+	}
+
+	if encode == "json" {
+		os.Stdout.Write(jsonBytes)
+	} else {
+
+		yamlBytes, err := yaml.JSONToYAML(jsonBytes)
+		if err != nil {
+			fmt.Println("error:", err)
+		}
+		os.Stdout.Write([]byte("---\n"))
+		os.Stdout.Write(yamlBytes)
+	}
+}
+
+// PrintCrd write on stdout the Prometheus CRD files as json or yaml
+func PrintCrd(conf Config) {
+	promCrd := k8sutil.NewPrometheusCustomResourceDefinition(conf.CrdKinds.Prometheus, conf.CrdGroup, conf.Labels.LabelsMap)
+	serviceMonitorCrd := k8sutil.NewServiceMonitorCustomResourceDefinition(conf.CrdKinds.ServiceMonitor, conf.CrdGroup, conf.Labels.LabelsMap)
+	alertManagerCrd := k8sutil.NewAlertmanagerCustomResourceDefinition(conf.CrdKinds.Alertmanager, conf.CrdGroup, conf.Labels.LabelsMap)
+
+	marshallCrd(promCrd, "yaml")
+	marshallCrd(serviceMonitorCrd, "yaml")
+	marshallCrd(alertManagerCrd, "yaml")
+
+}

cmd/po-crdgen/main.go

@@ -0,0 +1,43 @@
+// Copyright 2016 The prometheus-operator 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.
+
+package main
+
+import (
+	"flag"
+	monitoringv1 "github.com/coreos/prometheus-operator/pkg/client/monitoring/v1"
+	"k8s.io/api/core/v1"
+
+	"os"
+)
+
+var (
+	cfg Config
+)
+
+func init() {
+	cfg.CrdKinds = monitoringv1.DefaultCrdKinds
+	flagset := flag.NewFlagSet(os.Args[0], flag.ExitOnError)
+	flagset.Var(&cfg.Labels, "labels", "Labels to be add to all resources created by the operator")
+	flagset.BoolVar(&cfg.EnableValidation, "with-validation", false, "Include the validation spec")
+	flagset.StringVar(&cfg.CrdGroup, "crd-apigroup", monitoringv1.Group, "prometheus CRD  API group name")
+	flagset.Var(&cfg.CrdKinds, "crd-kinds", "customize CRD kind names")
+	flagset.StringVar(&cfg.Namespace, "namespace", v1.NamespaceAll, "Namespace to scope the interaction of the Prometheus Operator and the apiserver.")
+	flagset.Parse(os.Args[1:])
+}
+
+func main() {
+	PrintCrd(cfg)
+	os.Exit(0)
+}

pkg/k8sutil/k8sutil.go

@@ -36,6 +36,12 @@ import (
 	"k8s.io/client-go/rest"
 )
 
+// CustomResourceDefinitionTypeMeta set the default kind/apiversion of CRD
+var CustomResourceDefinitionTypeMeta metav1.TypeMeta = metav1.TypeMeta{
+	Kind:       "CustomResourceDefinition",
+	APIVersion: "apiextensions.k8s.io/v1beta1",
+}
+
 // WaitForCRDReady waits for a third party resource to be available for use.
 func WaitForCRDReady(listFunc func(opts metav1.ListOptions) (runtime.Object, error)) error {
 	err := wait.Poll(3*time.Second, 10*time.Minute, func() (bool, error) {
@@ -211,6 +217,7 @@ func NewPrometheusCustomResourceDefinition(crdkind monitoringv1.CrdKind, group s
 			Name:   crdkind.Plural + "." + group,
 			Labels: labels,
 		},
+		TypeMeta: CustomResourceDefinitionTypeMeta,
 		Spec: extensionsobj.CustomResourceDefinitionSpec{
 			Group:   group,
 			Version: monitoringv1.Version,
@@ -229,7 +236,7 @@ func NewServiceMonitorCustomResourceDefinition(crdkind monitoringv1.CrdKind, gro
 			Name:   crdkind.Plural + "." + group,
 			Labels: labels,
 		},
-
+		TypeMeta: CustomResourceDefinitionTypeMeta,
 		Spec: extensionsobj.CustomResourceDefinitionSpec{
 			Group:   group,
 			Version: monitoringv1.Version,
@@ -248,6 +255,7 @@ func NewAlertmanagerCustomResourceDefinition(crdkind monitoringv1.CrdKind, group
 			Name:   crdkind.Plural + "." + group,
 			Labels: labels,
 		},
+		TypeMeta: CustomResourceDefinitionTypeMeta,
 		Spec: extensionsobj.CustomResourceDefinitionSpec{
 			Group:   group,
 			Version: monitoringv1.Version,