sample Go code to show the aim

bindata.go

// Code generated by go-bindata.
// sources:
// asset/conf.json
// DO NOT EDIT!

package main

import (
	"bytes"
	"compress/gzip"
	"fmt"
	"io"
	"strings"
	"os"
	"time"
	"io/ioutil"
	"path/filepath"
)

func bindataRead(data []byte, name string) ([]byte, error) {
	gz, err := gzip.NewReader(bytes.NewBuffer(data))
	if err != nil {
		return nil, fmt.Errorf("Read %q: %v", name, err)
	}

	var buf bytes.Buffer
	_, err = io.Copy(&buf, gz)
	clErr := gz.Close()

	if err != nil {
		return nil, fmt.Errorf("Read %q: %v", name, err)
	}
	if clErr != nil {
		return nil, err
	}

	return buf.Bytes(), nil
}

type asset struct {
	bytes []byte
	info  os.FileInfo
}

type bindataFileInfo struct {
	name string
	size int64
	mode os.FileMode
	modTime time.Time
}

func (fi bindataFileInfo) Name() string {
	return fi.name
}
func (fi bindataFileInfo) Size() int64 {
	return fi.size
}
func (fi bindataFileInfo) Mode() os.FileMode {
	return fi.mode
}
func (fi bindataFileInfo) ModTime() time.Time {
	return fi.modTime
}
func (fi bindataFileInfo) IsDir() bool {
	return false
}
func (fi bindataFileInfo) Sys() interface{} {
	return nil
}

var _assetConfJson = []byte("\x1f\x8b\x08\x00\x00\x09\x6e\x88\x00\xff\x74\x54\x5b\x6f\xda\x4c\x14\x7c\xcf\xaf\xe0\xf3\xd7\xc7\xe2\xe5\xa2\x46\x06\x29\x8a\xaa\x28\x0a\x24\xa4\x08\x12\x68\xca\x0b\xda\xda\x8b\xbd\xb0\xb7\xee\x85\xe2\x54\xfd\xef\xdd\xf5\x3d\xc4\x41\xbc\xf8\xcc\xcc\x99\xf1\xd9\xb3\xfe\x73\xd1\xe9\x78\x1a\x29\x4d\x79\x84\xbc\x71\xc7\xfd\x76\x90\x28\xf4\xd9\x01\x47\x24\x15\xe6\xac\xa8\x77\x3c\x48\x44\x02\xbd\x0c\x12\x5c\xea\xb2\xee\xa0\xe1\x28\xe8\xe7\x08\x4d\x43\xce\x76\x15\xe6\x21\xc6\x78\x81\x40\x66\x20\xb1\x88\x97\x68\x2d\xd4\x18\x80\x88\x87\xca\x8f\x39\x8f\x09\xf2\x43\x4e\x81\x90\x48\x21\xa6\xa1\xb6\xae\x20\x02\xfd\x6e\x34\x18\xde\x2f\xe5\x6c\x4b\x93\x2e\xd9\xbe\x2c\xe7\x3f\xd4\xed\xf3\xea\xdb\x25\x31\xc7\xe9\x52\xdf\xf5\x26\x37\x9b\xc1\xe9\x35\x7d\xb8\x4c\x16\x00\x45\x58\x5f\x1b\x25\xae\x54\x02\x25\x66\x71\xee\xb9\xe3\xd2\x50\x17\xa6\xf2\x8c\x25\x37\xe2\x8d\x6b\xc6\x01\xd7\x09\xb9\xda\xc3\xff\xff\xcb\x9f\x5c\xea\xbd\x00\x79\x13\x8d\x64\xd6\xe3\xe3\xe0\xf6\xd9\x50\x9b\xdc\x85\xde\xcf\xa2\x87\x54\xae\x5f\xcc\x6a\xf1\xfc\x65\x93\xde\x1f\x28\xdd\x04\x13\x7e\x80\x4f\xc7\x6d\x3a\xbd\xbb\x91\xeb\x5f\xa3\xf9\xfa\x75\x91\xf6\x57\x1f\x84\x66\x5c\xe3\x7a\x80\x3b\xa8\x13\x4e\x09\x52\xaa\x2b\xb1\x3d\x92\x6e\x30\x0a\x7a\x7e\x82\x24\x3f\x18\x28\x84\xf3\xaf\x65\x33\x1e\x66\x23\xce\xa3\xda\xa4\xc4\x15\x12\xae\xf4\x38\x08\x86\xa3\xe2\x85\xaa\x62\x2b\xb3\x20\x21\x76\x6c\x9c\xb0\x4b\xd2\x1b\x6c\x23\x6c\x71\xdf\x41\x75\x23\xd4\x5c\x84\x92\xe3\x96\x00\xc7\x79\x53\x04\xf6\xd0\xdf\x2b\xbb\x49\xf9\xee\x40\x6d\x27\xca\x6a\xd5\xb9\xa8\x20\x34\x24\x6e\x45\xdf\xc8\xce\x25\x0d\x42\x43\xa6\x20\x15\xed\xf1\x72\xc4\xd7\xe8\xa4\x4b\x07\x5b\x80\xba\x26\x57\xd4\x0a\x29\x97\x18\xef\x90\xd2\xef\x79\x12\x1d\xbb\x25\xda\xcc\xe0\xd6\x39\x6c\xcd\x90\x21\xc5\xb4\xb1\x7d\x11\x0a\xc3\x96\xa1\x2c\x91\xe2\x46\x86\x48\xb9\xb9\x24\x53\xcb\x7b\xb4\xbc\x4a\xf4\x1b\xb7\x4d\xf2\xbd\xe8\x3b\x66\xcd\x0b\x6a\xbd\xfa\x85\xce\xf3\x7d\x60\xff\x67\xe8\xa0\x44\x3f\x4d\xe6\x8f\xb7\x60\x86\x7f\x4a\x28\x53\xf0\x55\x08\x82\xc3\xec\x86\x76\x9e\x8c\x70\xdf\x81\xec\xb2\x6c\x63\xde\x6c\x50\xa7\xf2\xfc\x66\x9d\x60\x66\x4e\x67\xbe\x17\x7f\xff\x05\x00\x00\xff\xff\xc0\x57\x0b\x95\x87\x04\x00\x00")

func assetConfJsonBytes() ([]byte, error) {
	return bindataRead(
		_assetConfJson,
		"asset/conf.json",
	)
}

func assetConfJson() (*asset, error) {
	bytes, err := assetConfJsonBytes()
	if err != nil {
		return nil, err
	}

	info := bindataFileInfo{name: "asset/conf.json", size: 1159, mode: os.FileMode(420), modTime: time.Unix(1454761250, 0)}
	a := &asset{bytes: bytes, info:  info}
	return a, nil
}

// Asset loads and returns the asset for the given name.
// It returns an error if the asset could not be found or
// could not be loaded.
func Asset(name string) ([]byte, error) {
	cannonicalName := strings.Replace(name, "\\", "/", -1)
	if f, ok := _bindata[cannonicalName]; ok {
		a, err := f()
		if err != nil {
			return nil, fmt.Errorf("Asset %s can't read by error: %v", name, err)
		}
		return a.bytes, nil
	}
	return nil, fmt.Errorf("Asset %s not found", name)
}

// MustAsset is like Asset but panics when Asset would return an error.
// It simplifies safe initialization of global variables.
func MustAsset(name string) []byte {
	a, err := Asset(name)
	if (err != nil) {
		panic("asset: Asset(" + name + "): " + err.Error())
	}

	return a
}

// AssetInfo loads and returns the asset info for the given name.
// It returns an error if the asset could not be found or
// could not be loaded.
func AssetInfo(name string) (os.FileInfo, error) {
	cannonicalName := strings.Replace(name, "\\", "/", -1)
	if f, ok := _bindata[cannonicalName]; ok {
		a, err := f()
		if err != nil {
			return nil, fmt.Errorf("AssetInfo %s can't read by error: %v", name, err)
		}
		return a.info, nil
	}
	return nil, fmt.Errorf("AssetInfo %s not found", name)
}

// AssetNames returns the names of the assets.
func AssetNames() []string {
	names := make([]string, 0, len(_bindata))
	for name := range _bindata {
		names = append(names, name)
	}
	return names
}

// _bindata is a table, holding each asset generator, mapped to its name.
var _bindata = map[string]func() (*asset, error){
	"asset/conf.json": assetConfJson,
}

// AssetDir returns the file names below a certain
// directory embedded in the file by go-bindata.
// For example if you run go-bindata on data/... and data contains the
// following hierarchy:
//     data/
//       foo.txt
//       img/
//         a.png
//         b.png
// then AssetDir("data") would return []string{"foo.txt", "img"}
// AssetDir("data/img") would return []string{"a.png", "b.png"}
// AssetDir("foo.txt") and AssetDir("notexist") would return an error
// AssetDir("") will return []string{"data"}.
func AssetDir(name string) ([]string, error) {
	node := _bintree
	if len(name) != 0 {
		cannonicalName := strings.Replace(name, "\\", "/", -1)
		pathList := strings.Split(cannonicalName, "/")
		for _, p := range pathList {
			node = node.Children[p]
			if node == nil {
				return nil, fmt.Errorf("Asset %s not found", name)
			}
		}
	}
	if node.Func != nil {
		return nil, fmt.Errorf("Asset %s not found", name)
	}
	rv := make([]string, 0, len(node.Children))
	for childName := range node.Children {
		rv = append(rv, childName)
	}
	return rv, nil
}

type bintree struct {
	Func func() (*asset, error)
	Children map[string]*bintree
}
var _bintree = &bintree{nil, map[string]*bintree{
	"asset": &bintree{nil, map[string]*bintree{
		"conf.json": &bintree{assetConfJson, map[string]*bintree{
		}},
	}},
}}

// RestoreAsset restores an asset under the given directory
func RestoreAsset(dir, name string) error {
        data, err := Asset(name)
        if err != nil {
                return err
        }
        info, err := AssetInfo(name)
        if err != nil {
                return err
        }
        err = os.MkdirAll(_filePath(dir, filepath.Dir(name)), os.FileMode(0755))
        if err != nil {
                return err
        }
        err = ioutil.WriteFile(_filePath(dir, name), data, info.Mode())
        if err != nil {
                return err
        }
        err = os.Chtimes(_filePath(dir, name), info.ModTime(), info.ModTime())
        if err != nil {
                return err
        }
        return nil
}

// RestoreAssets restores an asset under the given directory recursively
func RestoreAssets(dir, name string) error {
        children, err := AssetDir(name)
        // File
        if err != nil {
                return RestoreAsset(dir, name)
        }
        // Dir
        for _, child := range children {
                err = RestoreAssets(dir, filepath.Join(name, child))
                if err != nil {
                        return err
                }
        }
        return nil
}

func _filePath(dir, name string) string {
        cannonicalName := strings.Replace(name, "\\", "/", -1)
        return filepath.Join(append([]string{dir}, strings.Split(cannonicalName, "/")...)...)
}

test.go

package main

import (
	"strings"

	"github.com/k0kubun/pp"
	"github.com/spf13/viper"
)

// C is a global sttruct
type config struct {
	Testmode bool
	Version  string
}

// C is C
var C config

func main() {
	c := viper.New()

	asset, _ := Asset("asset/conf.json")

	c.ReadConfig(strings.NewReader(string(asset)))
	c.Unmarshal(&C)
	pp.Println(C)
}

thanks!👍