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config.go
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config.go
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// Copyright 2019 Copyright (c) 2019 SAP SE or an SAP affiliate company. All rights reserved. This file is licensed under the Apache Software License, v. 2 except as noted otherwise in the LICENSE file.
//
// 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 config
import (
"flag"
"fmt"
"os"
"github.com/hashicorp/go-multierror"
"github.com/spf13/viper"
"k8s.io/apimachinery/pkg/util/sets"
)
// ParseConfigForFlags tries to read configuration from the specified config file
// and applies its values to the non specified flags.
func ParseConfigForFlags(configFilePath string, fs *flag.FlagSet) error {
if configFilePath == "" {
return nil
}
if _, err := os.Stat(configFilePath); err != nil {
return err
}
viper.SetConfigFile(configFilePath)
if err := viper.ReadInConfig(); err != nil {
return err
}
return applyConfig(fs)
}
// applyConfig applies configuration values that are specified
// in the configuration file to the specific flags.
// Only flags are updated that are not defined by command line.
func applyConfig(fs *flag.FlagSet) error {
var allErrs *multierror.Error
definedFlags := sets.String{}
// get all flags that are defined by command line
fs.Visit(func(f *flag.Flag) {
definedFlags.Insert(f.Name)
})
fs.VisitAll(func(f *flag.Flag) {
if definedFlags.Has(f.Name) {
return
}
if err := f.Value.Set(viper.GetString(f.Name)); err != nil {
allErrs = multierror.Append(allErrs, fmt.Errorf("unable to set configuration for flag %s: %w", f.Name, err))
}
})
return allErrs.ErrorOrNil()
}