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helpers.go
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/
helpers.go
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// Copyright 2018 The Gardener 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 componentconfig
import (
"os"
)
// ApplyEnvironmentToConfig checks for several well-defined environment variables and if they are set,
// it sets the value of the respective keys of <config> to the values in the environment.
// Currently implemented environment variables:
// KUBECONFIG can override config.ClientConnection.KubeConfigFile
// WATCH_NAMESPACE can override config.Controller.WatchNamespace and config.LeaderElection.LockObjectNamespace
func ApplyEnvironmentToConfig(config *ControllerManagerConfiguration) {
if kubeconfig := os.Getenv("KUBECONFIG"); kubeconfig != "" {
config.ClientConnection.KubeConfigFile = kubeconfig
}
if watchNamespace := os.Getenv("WATCH_NAMESPACE"); watchNamespace != "" {
config.Controller.WatchNamespace = &watchNamespace
config.LeaderElection.LockObjectNamespace = watchNamespace
}
}