Replace instances of the string "master" with "main" in a git binary executable

git-decolonize.go

package main

import (
	"bytes"
	"fmt"
	"io"
	"io/ioutil"
	"os"
	"regexp"
)

func main() {
	byt, err := ioutil.ReadFile(os.Args[1])
	if err != nil {
		fmt.Println(err)
		return
	}

	re := regexp.MustCompile("master([^\x00]*)")
	out := re.ReplaceAll(byt, []byte("main${1}\x00\x00"))
	io.Copy(os.Stdout, bytes.NewBuffer(out))
}

Run with:

go run git-decolonize.go $(which git) > git-decolonized