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package main
import (
"crypto/md5"
"fmt"
"io/ioutil"
"os"
"path/filepath"
"sort"
)
// MD5All reads all the files in the file tree rooted at root and returns a map
// from file path to the MD5 sum of the file's contents. If the directory walk
// fails or any read operation fails, MD5All returns an error.
func MD5All(root string) (map[string][md5.Size]byte, error) {
m := make(map[string][md5.Size]byte)
err := filepath.Walk(root, func(path string, info os.FileInfo, err error) error { // HL
if err != nil {
return err
}
if !info.Mode().IsRegular() {
return nil
}
data, err := ioutil.ReadFile(path) // HL
if err != nil {
return err
}
m[path] = md5.Sum(data) // HL
return nil
})
if err != nil {
return nil, err
}
return m, nil
}
func main() {
// Calculate the MD5 sum of all files under the specified directory,
// then print the results sorted by path name.
m, err := MD5All(os.Args[1]) // HL
if err != nil {
fmt.Println(err)
return
}
var paths []string
for path := range m {
paths = append(paths, path)
}
sort.Strings(paths) // HL
for _, path := range paths {
fmt.Printf("%x %s\n", m[path], path)
}
}
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