Python实现文件的全备份和差异备份
之前有写利用md5方式来做差异备份，但是这种md5方式来写存在以下问题：[*] md5sum获取有些软连接的MD5值存在问题
[*] 不支持对空目录进行备份，因为md5sum无法获取空目录的md5值
[*] 权限的修改md5sum无法判断
解决方案：
利用文件的mtime ctime
mtime（Modified time）是在写入文件时随文件内容的更改而更改的
ctime（Create time）是在写入文件、更改所有者、权限或链接设置时随Inode的内容更改而更改的
废话不多说直接上代码：
#!/usr/bin/env pythonimport time,os,sys,cPicklefileInfo = {}def logger(time,fileName,status,fileNum): f = open('backup.log','a') f.write("%s\t%s\t%s\t\t%s\n" % (time,fileName,status,fileNum))def tar(sDir,dDir,fileNum): command = "tar zcf %s %s >/dev/null 2>&1" % (dDir + ".tar.gz",sDir) if os.system(command) == 0: logger(time.strftime('%F %X'),dDir + ".tar.gz",'success',fileNum) else: logger(time.strftime('%F %X'),dDir + ".tar.gz",'failed',fileNum)def fullBak(path): fileNum = 0 for root,dirs,files in os.walk(path): for name in files: file = os.path.join(root, name) mtime = os.path.getmtime(file) ctime = os.path.getctime(file) fileInfo = (mtime,ctime) fileNum += 1 f = open(P,'w') cPickle.dump(fileInfo,f) f.close() tar(S,D,fileNum)def diffBak(path): for root,dirs,files in os.walk(path): for name in files: file = os.path.join(root,name) mtime = os.path.getmtime(file) ctime = os.path.getctime(file) fileInfo = (mtime,ctime) if os.path.isfile(P) == 0: f = open(P,'w') f.close() if os.stat(P).st_size == 0: f = open(P,'w') cPickle.dump(fileInfo,f) fileNum = len(fileInfo.keys()) f.close() print fileNum tar(S,D,fileNum) else: f = open(P) old_fileInfo = cPickle.load(f) f.close() difference = dict(set(fileInfo.items())^set(old_fileInfo.items())) fileNum = len(difference) print fileNum difference_file = ' '.join(difference.keys()) print difference_file tar(difference_file,D,fileNum) f = open(P,'w') cPickle.dump(fileInfo,f) f.close()def Usage(): print ''' Syntax:python file_bakcup.py pickle_file model source_dir filename_bk model:1:Full backup 2:Differential backup example: python file_backup.py fileinfo.pk 2 /etc etc_$(date +%F) explain:Automatically add '.tar.gz' suffix ''' sys.exit()if len(sys.argv) != 5: Usage()P = sys.argvM = int(sys.argv)S = sys.argvD = sys.argvif M == 1: fullBak(S)elif M == 2: diffBak(S)else: print "\033[;31mDoes not support this mode\033 测试：
$ python file_backup.py data.pk 1 data data_$(date +%F) #全备份$ > data/www.linuxeye.com #测试创建文件，修改文件权限$ chmod 777 data/py/eshop_bk/data.db$ python file_backup.py data.pk 2 data data_$(date +%F)_1 #备份改变的文件2data/py/eshop_bk/data.db data/www.linuxeye.com Mon Oct 28 16:32:23 CST 2013
摘自：http://blog.linuxeye.com/377.html
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