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main.go
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main.go
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package main
import (
"crypto/sha256"
"flag"
"fmt"
"hash"
"io"
"io/fs"
"os"
"path/filepath"
"slices"
"strings"
)
var help = `hashdir
Calculate the hash of all files in a directory tree. Empty directories are ignored.
Usage:
hashdir
hashdir -ignore-git=false
hashdir ./dir`
var flagHelp = flag.Bool("help", false, "Set to view help")
var flagIgnoreGit = flag.Bool("ignore-git", true, "Set to false to include .git directories")
var flagIgnore = flag.String("ignore", "", "Set to a space separated list of directories to ignore.")
func main() {
flag.Parse()
if *flagHelp {
fmt.Println(help)
return
}
if len(flag.Args()) > 1 {
fmt.Println("Unexpected args.")
fmt.Println()
fmt.Println(help)
os.Exit(1)
}
dir := "."
if len(flag.Args()) == 1 {
dir = flag.Args()[0]
}
ignore := strings.Fields(*flagIgnore)
if *flagIgnoreGit {
ignore = append(ignore, ".git")
}
if err := walk(dir, ignore); err != nil {
fmt.Println(err.Error())
os.Exit(1)
}
}
func walk(dir string, ignore []string) error {
basePath, err := filepath.Abs(dir)
if err != nil {
return err
}
totalHash := sha256.New()
var totalBytes int64
var currentDir string
var dirHash hash.Hash
err = filepath.WalkDir(dir, func(path string, d fs.DirEntry, err error) error {
absolutePath, err := filepath.Abs(path)
if err != nil {
return err
}
// Open file.
r, err := os.Open(absolutePath)
if err != nil {
return fmt.Errorf("failed to open file: %w", err)
}
// Check to see if it's a directory.
fi, err := r.Stat()
if err != nil {
return err
}
if fi.IsDir() {
relDir, err := filepath.Rel(basePath, absolutePath)
if err != nil {
return fmt.Errorf("failed to get relative path: %w", err)
}
if slices.Contains(ignore, relDir) {
return filepath.SkipDir
}
if currentDir != "" {
fmt.Printf("%x %s\n\n", dirHash.Sum(nil), currentDir)
}
currentDir = relDir
dirHash = sha256.New()
return nil
}
// Calculate the SHA256 hash value of the file.
fileHash := sha256.New()
w := io.MultiWriter(totalHash, dirHash, fileHash)
n, err := io.Copy(w, r)
if err != nil {
return fmt.Errorf("failed to hash file: %w", err)
}
totalBytes += n
// Get the relative path.
relativePath, err := filepath.Rel(basePath, absolutePath)
if err != nil {
return fmt.Errorf("failed to get relative path: %w", err)
}
// Print results.
fmt.Printf("%x %s %s\n", fileHash.Sum(nil), relativePath, bytesToHuman(n))
return nil
})
if currentDir != "" {
fmt.Printf("%x %s\n\n", dirHash.Sum(nil), currentDir)
}
if err != nil {
return err
}
// Print overall hash.
fmt.Printf("%x . %s\n", totalHash.Sum(nil), bytesToHuman(totalBytes))
return nil
}
var limits = []int64{
1024, // B
1024 * 1024, // KB
1024 * 1024 * 1024, // MB
1024 * 1024 * 1024 * 1024, // GB
1024 * 1024 * 1024 * 1024 * 1024, // TB
1024 * 1024 * 1024 * 1024 * 1024 * 1024, // PB
}
var units = []string{"B", "KB", "MB", "GB", "TB", "PB"}
func bytesToHuman(n int64) (s string) {
var i int
var m int64
for i, m = range limits {
if n < m {
break
}
}
m = m / 1024
s = strings.TrimRight(strings.TrimRight(fmt.Sprintf("%.2f", float64(n)/float64(m)), "0"), ".")
return s + " " + units[i]
}