github.com/jmrodri/operator-sdk@v0.5.0/pkg/k8sutil/k8sutil.go (about) 1 // Copyright 2018 The Operator-SDK Authors 2 // 3 // Licensed under the Apache License, Version 2.0 (the "License"); 4 // you may not use this file except in compliance with the License. 5 // You may obtain a copy of the License at 6 // 7 // http://www.apache.org/licenses/LICENSE-2.0 8 // 9 // Unless required by applicable law or agreed to in writing, software 10 // distributed under the License is distributed on an "AS IS" BASIS, 11 // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 12 // See the License for the specific language governing permissions and 13 // limitations under the License. 14 15 package k8sutil 16 17 import ( 18 "fmt" 19 "io/ioutil" 20 "os" 21 "strings" 22 23 discovery "k8s.io/client-go/discovery" 24 logf "sigs.k8s.io/controller-runtime/pkg/runtime/log" 25 ) 26 27 var log = logf.Log.WithName("k8sutil") 28 29 // GetWatchNamespace returns the namespace the operator should be watching for changes 30 func GetWatchNamespace() (string, error) { 31 ns, found := os.LookupEnv(WatchNamespaceEnvVar) 32 if !found { 33 return "", fmt.Errorf("%s must be set", WatchNamespaceEnvVar) 34 } 35 return ns, nil 36 } 37 38 // errNoNS indicates that a namespace could not be found for the current 39 // environment 40 var ErrNoNamespace = fmt.Errorf("namespace not found for current environment") 41 42 // GetOperatorNamespace returns the namespace the operator should be running in. 43 func GetOperatorNamespace() (string, error) { 44 nsBytes, err := ioutil.ReadFile("/var/run/secrets/kubernetes.io/serviceaccount/namespace") 45 if err != nil { 46 if os.IsNotExist(err) { 47 return "", ErrNoNamespace 48 } 49 return "", err 50 } 51 ns := strings.TrimSpace(string(nsBytes)) 52 log.V(1).Info("Found namespace", "Namespace", ns) 53 return ns, nil 54 } 55 56 // GetOperatorName return the operator name 57 func GetOperatorName() (string, error) { 58 operatorName, found := os.LookupEnv(OperatorNameEnvVar) 59 if !found { 60 return "", fmt.Errorf("%s must be set", OperatorNameEnvVar) 61 } 62 if len(operatorName) == 0 { 63 return "", fmt.Errorf("%s must not be empty", OperatorNameEnvVar) 64 } 65 return operatorName, nil 66 } 67 68 // ResourceExists returns true if the given resource kind exists 69 // in the given api groupversion 70 func ResourceExists(dc discovery.DiscoveryInterface, apiGroupVersion, kind string) (bool, error) { 71 apiLists, err := dc.ServerResources() 72 if err != nil { 73 return false, err 74 } 75 for _, apiList := range apiLists { 76 if apiList.GroupVersion == apiGroupVersion { 77 for _, r := range apiList.APIResources { 78 if r.Kind == kind { 79 return true, nil 80 } 81 } 82 } 83 } 84 return false, nil 85 }