sakuin/cmd/root.go

/*
Copyright © 2022 Tone

This program is free software: you can redistribute it and/or modify
it under the terms of the GNU Affero General Public License as published by
the Free Software Foundation, either version 3 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 Affero General Public License for more details.

You should have received a copy of the GNU Affero General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
package cmd

import (
	"os"

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

var cfgFile string

var log zerolog.Logger

// rootCmd represents the base command when called without any subcommands
var rootCmd = &cobra.Command{
	Use:   "sakuin",
	Short: "Simple but effective fileserver",
	Long:  `An HTTP fileserver in golang with a simple WebUI`,
}

// 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() {
	err := rootCmd.Execute()
	if err != nil {
		os.Exit(1)
	}
}

func init() {
	cobra.OnInitialize(initConfig)

	rootCmd.PersistentFlags().StringVar(&cfgFile, "config", "", "config file (default is $HOME/.sakuin.yaml)")

	host, _ := os.Hostname()
	log = zerolog.New(os.Stdout).With().
		Timestamp().
		Str("role", "sakuin").
		Str("host", host).
		Logger()
}

// initConfig reads in config file and ENV variables if set.
func initConfig() {
	if cfgFile != "" {
		// Use config file from the flag.
		viper.SetConfigFile(cfgFile)
	} else {
		// Find home directory.
		home, err := os.UserHomeDir()
		cobra.CheckErr(err)

		// Search config in home directory with name ".sakuin" (without extension).
		viper.AddConfigPath(home)
		viper.SetConfigType("yaml")
		viper.SetConfigName(".sakuin")
	}

	viper.SetEnvPrefix("sakuin")
	viper.AutomaticEnv() // read in environment variables that match

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