/
kubeconfig.go
78 lines (65 loc) · 2.11 KB
/
kubeconfig.go
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package kubeconfig
import (
"io/ioutil"
"os"
"path/filepath"
"github.com/pkg/errors"
"k8s.io/apimachinery/pkg/runtime"
"k8s.io/client-go/tools/clientcmd"
"k8s.io/client-go/tools/clientcmd/api"
"k8s.io/client-go/tools/clientcmd/api/latest"
)
// ReadKubeConfig reads the kube config from the specified filename or returns a new Config object if not found
func ReadKubeConfig(filename string) (*api.Config, error) {
data, err := ioutil.ReadFile(filename)
if os.IsNotExist(err) {
return api.NewConfig(), nil
} else if err != nil {
return nil, errors.Wrapf(err, "Error reading file %q", filename)
} else if len(data) == 0 {
return api.NewConfig(), nil
}
// decode config, empty if no bytes
unconvertedConfig, _, err := latest.Codec.Decode(data, nil, nil)
if err != nil {
return nil, errors.Wrapf(err, "Error decoding config from data: %s", string(data))
}
config := unconvertedConfig.(*api.Config)
// initialize nil maps
if config.AuthInfos == nil {
config.AuthInfos = map[string]*api.AuthInfo{}
}
if config.Clusters == nil {
config.Clusters = map[string]*api.Cluster{}
}
if config.Contexts == nil {
config.Contexts = map[string]*api.Context{}
}
return config, nil
}
// GetCurrentContext retrieves the current context from the kube file
func GetCurrentContext() (string, error) {
config, err := ReadKubeConfig(clientcmd.RecommendedHomeFile)
if err != nil {
return "", err
}
return config.CurrentContext, nil
}
// WriteKubeConfig writes the kube config back to the specified filename
func WriteKubeConfig(config *api.Config, filename string) error {
// encode config to YAML
data, err := runtime.Encode(latest.Codec, config)
if err != nil {
return errors.Errorf("could not write to '%s': failed to encode config: %v", filename, err)
}
// create parent dir if doesn't exist
dir := filepath.Dir(filename)
if err = os.MkdirAll(dir, 0755); err != nil {
return errors.Wrapf(err, "Error creating directory: %s", dir)
}
// write with restricted permissions
if err := ioutil.WriteFile(filename, data, 0666); err != nil {
return errors.Wrapf(err, "Error writing file %s", filename)
}
return nil
}