Uses SHA256 hash sums to determine which files change.

differ.go

package main

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

func loadLog(fileName string) map[string]string {
	hashes := make(map[string]string)
	content, err := ioutil.ReadFile(fileName)
    if err != nil {
        log.Fatal(err)
    }
	text := string(content)
	lines := strings.Split(text, "\n")
	for _,line := range lines{
		if len(line) > 64{
			hash := line[:64]
			fn := line[64:]
			hashes[hash] = fn
		}
	}
	return hashes
}

func hasKey(collection map[string]string,item string) bool{
	_,ok := collection[item]
	return ok
}

func main(){
	log1 := loadLog(os.Args[1])
	log2 := loadLog(os.Args[2])
	
	fmt.Println("Changed in second log:")
	for k := range log2{
		if !hasKey(log1,k){
			fmt.Println(k+log2[k])
		}
	}
	fmt.Println("Changed from first log:")
	for k := range log1{
		if !hasKey(log2,k){
			fmt.Println(k+log1[k])
		}
	}
}

logger.go

package main

import(
    "os"
    "fmt"
    "io/ioutil"
    "crypto/sha256"
    "log"
    "encoding/hex"
    "path/filepath"
)

func hashFile(fileHandle string)string{
    hasher := sha256.New()
    s, err := ioutil.ReadFile(fileHandle)
    hasher.Write(s)
    if err != nil {
        //log.Fatal(err)
	fmt.Println("#[ERR1HashingFile]"+fileHandle)
    }
    return hex.EncodeToString(hasher.Sum(nil))
}

func hashLogger(prefix string,fileHandle os.FileInfo)string{
	hashes := ""
	if fileHandle.IsDir(){
		hashes += fileHandle.Name()+"\n"
		err := os.Chdir(fileHandle.Name())
		if err != nil {
			fmt.Println("#[ERR2ChangingDirtectory]"+fileHandle.Name())
		}else{
			f,err := os.Open(".")
			if err != nil {
				fmt.Println("#[ERR3OpeningDirectroy]"+fileHandle.Name())
				//log.Fatal(err)
			}else{
				files,_:= f.Readdir(0)
				for _, v := range files {
					hashes += hashLogger(filepath.Join(prefix,fileHandle.Name()),v)+"\n"
				}
				os.Chdir("..")
			}
		}
	} else {
		hashes+=hashFile(fileHandle.Name())+"@"+filepath.Join(prefix,fileHandle.Name())
	}
	return hashes
}

func main(){
	fi,_ := os.Stat(os.Args[1])
	fmt.Println(hashLogger("",fi))
}