blob: 5ca3e76a2f7b2a299dd113c583c5da766ce4a400 [file] [log] [blame]
// +build OMIT
package main
import (
// A result is the product of reading and summing a file using MD5.
type result struct {
path string
sum [md5.Size]byte
err error
// sumFiles starts goroutines to walk the directory tree at root and digest each
// regular file. These goroutines send the results of the digests on the result
// channel and send the result of the walk on the error channel. If done is
// closed, sumFiles abandons its work.
func sumFiles(done <-chan struct{}, root string) (<-chan result, <-chan error) {
// For each regular file, start a goroutine that sums the file and sends
// the result on c. Send the result of the walk on errc.
c := make(chan result)
errc := make(chan error, 1)
go func() { // HL
var wg sync.WaitGroup
err := filepath.Walk(root, func(path string, info os.FileInfo, err error) error {
if err != nil {
return err
if !info.Mode().IsRegular() {
return nil
go func() { // HL
data, err := ioutil.ReadFile(path)
select {
case c <- result{path, md5.Sum(data), err}: // HL
case <-done: // HL
// Abort the walk if done is closed.
select {
case <-done: // HL
return errors.New("walk canceled")
return nil
// Walk has returned, so all calls to wg.Add are done. Start a
// goroutine to close c once all the sends are done.
go func() { // HL
close(c) // HL
// No select needed here, since errc is buffered.
errc <- err // HL
return c, errc
// 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. In that case,
// MD5All does not wait for inflight read operations to complete.
func MD5All(root string) (map[string][md5.Size]byte, error) {
// MD5All closes the done channel when it returns; it may do so before
// receiving all the values from c and errc.
done := make(chan struct{}) // HLdone
defer close(done) // HLdone
c, errc := sumFiles(done, root) // HLdone
m := make(map[string][md5.Size]byte)
for r := range c { // HLrange
if r.err != nil {
return nil, r.err
m[r.path] = r.sum
if err := <-errc; 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])
if err != nil {
var paths []string
for path := range m {
paths = append(paths, path)
for _, path := range paths {
fmt.Printf("%x %s\n", m[path], path)