/
config.go
69 lines (58 loc) · 1.73 KB
/
config.go
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package config
import (
"errors"
"fmt"
"os"
"path/filepath"
"k8s.io/client-go/rest"
"k8s.io/client-go/tools/clientcmd"
)
var (
ErrConfigNotFound = errors.New("can't find kubeconfig")
ErrConfigBuild = errors.New("could not build kubeconfig from flags")
)
type Provider interface {
GetEnv(key string) string
Stat(name string) (os.FileInfo, error)
BuildConfigFromFlags(masterUrl, kubeconfigPath string) (*rest.Config, error)
InClusterConfig() (*rest.Config, error)
}
type DefaultProvider struct{}
func (dp *DefaultProvider) GetEnv(key string) string {
return os.Getenv(key)
}
func (dp *DefaultProvider) Stat(name string) (os.FileInfo, error) {
return os.Stat(name)
}
func (dp *DefaultProvider) BuildConfigFromFlags(masterUrl, kubeconfigPath string) (*rest.Config, error) {
return clientcmd.BuildConfigFromFlags(masterUrl, kubeconfigPath)
}
func (dp *DefaultProvider) InClusterConfig() (*rest.Config, error) {
return rest.InClusterConfig()
}
func New(p Provider) (*rest.Config, error) {
if kubeconfig := p.GetEnv("KUBECONFIG"); kubeconfig != "" {
config, err := p.BuildConfigFromFlags("", kubeconfig)
if err != nil {
return nil, ErrConfigBuild
}
fmt.Println("using the KUBECONFIG env. var for config")
return config, nil
}
kubeconfigPath := filepath.Join(p.GetEnv("HOME"), ".kube", "config")
if _, err := p.Stat(kubeconfigPath); err == nil {
config, err := p.BuildConfigFromFlags("", kubeconfigPath)
if err != nil {
return nil, ErrConfigBuild
}
fmt.Println("using the /home/.kube/config file as config")
return config, nil
} else {
config, err := p.InClusterConfig()
if err == nil {
fmt.Println("using the in-cluster service account for kubeconfig")
return config, nil
}
}
return nil, ErrConfigNotFound
}