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discovery.go
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discovery.go
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/*
Copyright (c) 2022 RaptorML 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 setup
import (
"fmt"
"github.com/spf13/viper"
"os"
)
const inClusterNamespacePath = "/var/run/secrets/kubernetes.io/serviceaccount/namespace"
var inClusterNamespace = ""
func getInClusterNamespace() (string, error) {
if inClusterNamespace != "" {
return inClusterNamespace, nil
}
if viper.GetString("system-namespace") != "" {
inClusterNamespace = viper.GetString("system-namespace")
return inClusterNamespace, nil
}
// Check whether the namespace file exists.
// If not, we are not running in cluster so can't guess the namespace.
if _, err := os.Stat(inClusterNamespacePath); os.IsNotExist(err) {
return "", fmt.Errorf("not running in-cluster! cannot guess namespace")
} else if err != nil {
return "", fmt.Errorf("error checking namespace file: %w", err)
}
// Load the namespace file and return its content
namespace, err := os.ReadFile(inClusterNamespacePath)
if err != nil {
return "", fmt.Errorf("error reading namespace file: %w", err)
}
inClusterNamespace = string(namespace)
return inClusterNamespace, nil
}