Python 文件完整性监控

Question

我写了以下代码，但它无法正常工作，我也不知道为什么。代码的功能如下：

1. 读取目标文件的列表
2. 遍历各个目录
3. 对文件进行MD5哈希处理
4. 检查当前文件是否在之前的记录中有MD5哈希值
5. 如果这个文件是新的，就记录为新文件
6. 如果记录中已经存在但文件有变化，就记录这个变化
7. 如果文件既不是新文件也没有变化，那就什么都不做

以下是代码：

import hashlib
import logging as log
import optparse
import os
import re
import sys
import glob
import shutil

def md5(fileName):
    """Compute md5 hash of the specified file"""
    try:
        fileHandle = open(fileName, "rb")
    except IOError:
        return
    m5Hash = hashlib.md5()
    while True:
        data = fileHandle.read(8192)
        if not data:
            break
        m5Hash.update(data)
    fileHandle.close()
    return m5Hash.hexdigest()

req = open("requested.txt")
for reqline in req:
    reqName = reqline[reqline.rfind('/') + 1:len(reqline) - 1]
    reqDir = reqline[0:reqline.rfind('/') + 1] 
    tempFile = open("activetemp.txt", 'w') 
    for name in glob.glob(reqDir + reqName):    
        fileHash = md5(name) 
        actInt = 0
        if fileHash != None:

            actFile = open("activefile.txt")

            for actLine in actFile:
                actNameDir = actLine[0:actLine.rfind(' : ')]
                actHash = actLine[actLine.rfind(' : ') + 3:len(actLine) -1]
                if actNameDir == name and actHash == fileHash:
                    tempFile.write(name + " : " + fileHash + "\n")
                    actInt = 1 
                    print fileHash
                    print actHash
                    print name
                    print actNameDir
                if actNameDir == name and actHash != fileHash:
                    fimlog = open("fimlog.txt", 'a')
                    tempFile.write(name + " : " + actHash + "\n")         
                    actInt = 1
                    fimlog.write("FIM Log: The file " + name +  " was modified: " + actHash + "\n") 
            if actInt == 0: 
                fimlog = open("fimlog.txt", 'a')
                fimlog.write("FIM Log: The file " + name +  " was created: " + fileHash + "\n")
                tempFile.write(name + " : " + fileHash + "\n")                       

shutil.copyfile("activetemp.txt", "activefile.txt")

Answer 1

你没有详细描述问题，但一个可能的原因是你没有关闭tempFile（或者其他文件），这样最后的文件复制可能会失败。