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// SPDX-License-Identifier: GPL-3.0-or-later
package k8s_state
import (
"errors"
"os"
"path/filepath"
"k8s.io/client-go/kubernetes"
"k8s.io/client-go/rest"
"k8s.io/client-go/tools/clientcmd"
_ "k8s.io/client-go/plugin/pkg/client/auth/gcp"
"github.com/mattn/go-isatty"
)
const (
envKubeServiceHost = "KUBERNETES_SERVICE_HOST"
envKubeServicePort = "KUBERNETES_SERVICE_PORT"
)
func newKubeClient() (kubernetes.Interface, error) {
if os.Getenv(envKubeServiceHost) != "" && os.Getenv(envKubeServicePort) != "" {
return newKubeClientInCluster()
}
if isatty.IsTerminal(os.Stdout.Fd()) {
return newKubeClientOutOfCluster()
}
return nil, errors.New("can not create Kubernetes client: not inside a cluster")
}
func newKubeClientInCluster() (*kubernetes.Clientset, error) {
config, err := rest.InClusterConfig()
if err != nil {
return nil, err
}
config.UserAgent = "Netdata/kube-state"
return kubernetes.NewForConfig(config)
}
func newKubeClientOutOfCluster() (*kubernetes.Clientset, error) {
home := homeDir()
if home == "" {
return nil, errors.New("couldn't find home directory")
}
configPath := filepath.Join(home, ".kube", "config")
config, err := clientcmd.BuildConfigFromFlags("", configPath)
if err != nil {
return nil, err
}
config.UserAgent = "Netdata/kube-state"
return kubernetes.NewForConfig(config)
}
func homeDir() string {
if h := os.Getenv("HOME"); h != "" {
return h
}
return os.Getenv("USERPROFILE") // windows
}
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