luet/cmd/root.go

// Copyright © 2019 Ettore Di Giacinto <mudler@gentoo.org>
//
// This program is free software; you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation; either version 2 of the License, or
// (at your option) any later version.
//
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License along
// with this program; if not, see <http://www.gnu.org/licenses/>.

package cmd

import (
	"os"
	"path"
	"path/filepath"

	. "github.com/mudler/luet/pkg/logger"

	"github.com/spf13/cobra"
	"github.com/spf13/viper"
)

var cfgFile string
var Verbose bool

const LuetCLIVersion = "0.1-dev"

// RootCmd represents the base command when called without any subcommands
var RootCmd = &cobra.Command{
	Use:     "luet",
	Short:   "Package manager for the XXth century!",
	Long:    `Package manager which supports Gentoo and Entropy packages`,
	Version: LuetCLIVersion,
}

// Execute adds all child commands to the root command 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 {
		Error(err)
		os.Exit(-1)
	}
}

func init() {
	cobra.OnInitialize(initConfig)
	RootCmd.PersistentFlags().StringVar(&cfgFile, "config", "", "config file (default is $HOME/.luet.yaml)")
	RootCmd.PersistentFlags().BoolVarP(&Verbose, "verbose", "v", false, "verbose output")
}

// initConfig reads in config file and ENV variables if set.
func initConfig() {
	dir, err := filepath.Abs(filepath.Dir(os.Args[0]))
	if err != nil {
		Error(err)
		os.Exit(1)
	}

	viper.SetConfigName(".luet") // name of config file (without extension)
	if cfgFile != "" {           // enable ability to specify config file via flag
		Info(">>> cfgFile: ", cfgFile)
		viper.SetConfigFile(cfgFile)
		configDir := path.Dir(cfgFile)
		if configDir != "." && configDir != dir {
			viper.AddConfigPath(configDir)
		}
	}

	viper.AddConfigPath(dir)
	viper.AddConfigPath(".")
	viper.AddConfigPath("$HOME")
	viper.AutomaticEnv() // read in environment variables that match

	// If a config file is found, read it in.
	if err := viper.ReadInConfig(); err == nil {
		Info("Using config file:", viper.ConfigFileUsed())
	} else {
		Warning(err)
	}

}