serial.go

     1  // +build OMIT
     2  
     3  package main
     4  
     5  import (
     6  	"crypto/md5"
     7  	"fmt"
     8  	"io/ioutil"
     9  	"os"
    10  	"path/filepath"
    11  	"sort"
    12  )
    13  
    14  // MD5All reads all the files in the file tree rooted at root and returns a map
    15  // from file path to the MD5 sum of the file's contents.  If the directory walk
    16  // fails or any read operation fails, MD5All returns an error.
    17  func MD5All(root string) (map[string][md5.Size]byte, error) {
    18  	m := make(map[string][md5.Size]byte)
    19  	err := filepath.Walk(root, func(path string, info os.FileInfo, err error) error { // HL
    20  		if err != nil {
    21  			return err
    22  		}
    23  		if !info.Mode().IsRegular() {
    24  			return nil
    25  		}
    26  		data, err := ioutil.ReadFile(path) // HL
    27  		if err != nil {
    28  			return err
    29  		}
    30  		m[path] = md5.Sum(data) // HL
    31  		return nil
    32  	})
    33  	if err != nil {
    34  		return nil, err
    35  	}
    36  	return m, nil
    37  }
    38  
    39  func main() {
    40  	// Calculate the MD5 sum of all files under the specified directory,
    41  	// then print the results sorted by path name.
    42  	m, err := MD5All(os.Args[1]) // HL
    43  	if err != nil {
    44  		fmt.Println(err)
    45  		return
    46  	}
    47  	var paths []string
    48  	for path := range m {
    49  		paths = append(paths, path)
    50  	}
    51  	sort.Strings(paths) // HL
    52  	for _, path := range paths {
    53  		fmt.Printf("%x  %s\n", m[path], path)
    54  	}
    55  }
    56
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