Viper: struct yaml tags are not respected

Created on 11 Sep 2017 · 5Comments · Source: spf13/viper

gopkg.in will treat yaml tags properly, but something is happening in viper that ignores them. Given the following main and config file, it will fail to read in the proper yaml keys...

main.go

package main

import (
    "fmt"
    "log"
    "os"

    "github.com/pkg/errors"
    "github.com/spf13/viper"
)

type Config struct {
    Foo string `yaml:"foo-thing"`
    Bar string `yaml:"bar-thing"`
}

var Conf Config

func main() {
    initConfig()
}

// initConfig reads in config file and ENV variables if set.
func initConfig() {
    viper.SetConfigName(".conf") // name of config file (without extension)
    // add working dir path above the home dir for the config file
    path, _ := os.Getwd()
    viper.AddConfigPath(path)
    viper.AutomaticEnv() // read in environment variables that match

    // If a config file is found, read it in.
    err := viper.ReadInConfig()
    switch {
    case err != nil:
        log.Println(err)
    default:
        fmt.Println("Using config file:", viper.ConfigFileUsed())
    }

    err = viper.Unmarshal(&Conf)
    if err != nil {
        log.Println(errors.Wrap(err, "unmarshal config file"))
    }

    log.Println(Conf)
}

.conf