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statestore.go
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/
statestore.go
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package registry
import (
"fmt"
"k8s.io/kops/upup/pkg/fi/utils"
"k8s.io/kops/util/pkg/vfs"
"os"
"strings"
)
func ReadConfig(configPath vfs.Path, config interface{}) error {
data, err := configPath.ReadFile()
if err != nil {
if os.IsNotExist(err) {
return err
}
return fmt.Errorf("error reading configuration file %s: %v", configPath, err)
}
// Yaml can't parse empty strings
configString := string(data)
configString = strings.TrimSpace(configString)
if configString != "" {
err = utils.YamlUnmarshal([]byte(configString), config)
if err != nil {
return fmt.Errorf("error parsing configuration: %v", err)
}
}
return nil
}
func WriteConfig(configPath vfs.Path, config interface{}, writeOptions ...vfs.WriteOption) error {
data, err := utils.YamlMarshal(config)
if err != nil {
return fmt.Errorf("error marshalling configuration: %v", err)
}
create := false
for _, writeOption := range writeOptions {
switch writeOption {
case vfs.WriteOptionCreate:
create = true
case vfs.WriteOptionOnlyIfExists:
_, err = configPath.ReadFile()
if err != nil {
if os.IsNotExist(err) {
return fmt.Errorf("cannot update configuration file %s: does not exist", configPath)
}
return fmt.Errorf("error checking if configuration file %s exists already: %v", configPath, err)
}
default:
return fmt.Errorf("unknown write option: %q", writeOption)
}
}
if create {
err = configPath.CreateFile(data)
} else {
err = configPath.WriteFile(data)
}
if err != nil {
return fmt.Errorf("error writing configuration file %s: %v", configPath, err)
}
return nil
}