syncthing/cmd/stwatchfile/main.go
2017-02-09 08:04:16 +01:00

99 lines
1.8 KiB
Go

// Copyright (C) 2015 The Syncthing Authors.
//
// This Source Code Form is subject to the terms of the Mozilla Public
// License, v. 2.0. If a copy of the MPL was not distributed with this file,
// You can obtain one at https://mozilla.org/MPL/2.0/.
package main
import (
"bytes"
"crypto/md5"
"flag"
"fmt"
"io"
"os"
"time"
)
func getmd5(filePath string) ([]byte, error) {
var result []byte
file, err := os.Open(filePath)
if err != nil {
return result, err
}
defer file.Close()
hash := md5.New()
if _, err := io.Copy(hash, file); err != nil {
return result, err
}
return hash.Sum(result), nil
}
func main() {
period := flag.Duration("period", 200*time.Millisecond, "Sleep period between checks")
flag.Parse()
file := flag.Arg(0)
if file == "" {
fmt.Println("Expects a path as an argument")
return
}
exists := true
size := int64(0)
mtime := time.Time{}
hash := []byte{}
for {
time.Sleep(*period)
newExists := true
fi, err := os.Stat(file)
if err != nil && os.IsNotExist(err) {
newExists = false
} else if err != nil {
fmt.Println("stat:", err)
return
}
if newExists != exists {
exists = newExists
if !newExists {
fmt.Println(file, "does not exist")
} else {
fmt.Println(file, "appeared")
}
}
if !exists {
size = 0
mtime = time.Time{}
hash = []byte{}
continue
}
if fi.IsDir() {
fmt.Println(file, "is directory")
return
}
newSize := fi.Size()
newMtime := fi.ModTime()
newHash, err := getmd5(file)
if err != nil {
fmt.Println("getmd5:", err)
}
if newSize != size || newMtime != mtime || !bytes.Equal(newHash, hash) {
fmt.Println(file, "Size:", newSize, "Mtime:", newMtime, "Hash:", fmt.Sprintf("%x", newHash))
hash = newHash
size = newSize
mtime = newMtime
}
}
}