gistfile1.txt

"production" = {
  "host" = "cool.example.com"
  "password" = "xPYmDlsYDQKCbcaY3Xa68-SwdM-wYkHnNYn_ARiYbWRon2UNuzw6RG5DAZjO0Dmz6O-iMVIjX-hWc1ihT3WX"
  "port" = 22
  "user" = "bob"
}

test

package main

import (
	"fmt"
	"io/ioutil"
	"log"
	"os"

	"github.com/spf13/viper"
	"gopkg.in/yaml.v2"
)

type Host struct {
	Label    string
	Host     string
	Password string
}
type Hosts struct {
	Hosts []Host
}

func main() {

	viper.SetConfigName("ssh-cryptkpr")
	viper.AddConfigPath(currentdir())
	err := viper.ReadInConfig() // Find and read the config file
	if err != nil {             // Handle errors reading the config file
		log.Fatal(err)
	}

	h := Hosts{}

	err = viper.Unmarshal(&h)
	if err != nil {
		log.Fatalf("unable to decode into struct, %v", err)
	}

	for _, v := range h.Hosts {
		fmt.Println("Host Label: " + v.Label)
	}

	fmt.Println(h)

	// Change value in map and marshal back into yaml
	h.Hosts[0].Password = "new_password"

	fmt.Println(h)

	d, err := yaml.Marshal(&h)
	if err != nil {
		log.Fatalf("error: %v", err)
	}

	fmt.Println(string(d))

	// write to file
	f, err := os.Create("/tmp/dat2")
	if err != nil {
		log.Fatal(err)
	}

	err = ioutil.WriteFile("changed.yaml", d, 0644)
	if err != nil {
		log.Fatal(err)
	}

	f.Close()

}

func currentdir() (cwd string) {
	cwd, err := os.Getwd()
	if err != nil {
		log.Fatal(err)
	}

	return cwd
}