/
root.go
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/
root.go
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// Copyright © 2018 Cisco Systems, Inc.
//
// 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 cmd
import (
"os"
"github.com/spf13/cobra"
"github.com/spf13/viper"
log "github.com/sirupsen/logrus"
)
var (
configFileFlag string
versionNumber string
)
// RootCmd represents the base command when called without any subcommands
var RootCmd = &cobra.Command{
Use: "mh",
Short: "Operate multiple Helm charts",
Long: ` __
/\ \
___ ___ \ \ \___
/. __. __.\ \ \ _ \
/\ \/\ \/\ \ \ \ \ \ \
\ \_\ \_\ \_\ \ \_\ \_\
\/_/\/_/\/_/ \/_/\/_/
mh simplifies multi-chart Helm workflows by rendering ephemeral Helm
chart override files based on templates populated with values from mh
YAML config files.
In other words: We heard you like templates, so we templated your Helm value
overrides.`,
}
// Local common flags for sub-commands
var (
setValuesFlag []string
printRendered bool
)
// Execute adds all child commands to the root command and sets flags appropriately.
// This is called by main.main(). It only needs to happen once to the rootCmd.
func Execute() {
if err := RootCmd.Execute(); err != nil {
log.WithFields(log.Fields{
"err": err,
}).Fatal("Failed to execute RootCmd.")
}
}
func init() {
versionNumber = "v0.8.0"
cobra.OnInitialize(initConfig)
RootCmd.PersistentFlags().StringVarP(&configFileFlag, "config", "c", "",
`config file (you can instead set MH_CONFIG)`)
RootCmd.PersistentFlags().BoolP("json", "j", false, "set logging to JSON format")
// Beware that init() happens too early to read values from Viper...
// See: https://github.com/spf13/cobra/issues/511
//
// TL;DR -- Use Viper for retrieving values, but read values no earlier than at "Run:" time.
viper.BindPFlags(RootCmd.PersistentFlags())
}
// initConfig reads in config file and ENV variables if set.
func initConfig() {
var (
configFile string
configFileEnv string
configFileEnvPresent bool
configFileOrigin string
)
// If environment variable is set, load its value.
configFileEnv, configFileEnvPresent = os.LookupEnv("MH_CONFIG")
if configFileEnvPresent {
configFile = configFileEnv
configFileOrigin = "env"
}
if configFileFlag != "" {
// If flag isn't empty, load its value instead.
configFile = configFileFlag
configFileOrigin = "flag"
}
viper.SetConfigFile(configFile)
viper.SetEnvPrefix("mh") // will be uppercased automatically
viper.AutomaticEnv() // read in environment variables that match
// If a configFile is found, read it in.
err := viper.ReadInConfig()
if viper.GetBool("json") {
log.SetFormatter(&log.JSONFormatter{})
}
if err != nil {
log.WithFields(log.Fields{
"configFile": configFile,
"configFileEnv": configFileEnv,
"configFileEnvPresent": configFileEnvPresent,
"configFileFlag": configFileFlag,
"configFileOrigin": configFileOrigin,
"configFileUsed": viper.ConfigFileUsed(),
"err": err,
}).Warnln("Failed to load mh config.",
"Please consider exporting environment variable: MH_CONFIG.")
}
}