1、既要可以實(shí)現(xiàn)完全備份羡玛，又要實(shí)現(xiàn)增量備份
2别智、完全備份時(shí)，將目錄打個(gè)tar包稼稿，計(jì)算每個(gè)文件的md5值
3薄榛、增量備份時(shí)，備份有變化的文件和新增加的文件让歼，更新md5值
import time
import os
import tarfile
import hashlib
import pickle
def check_md5(fname):
m = hashlib.md5()
with open(fname, 'rb') as fobj:
while True:
data = fobj.read(4096)
if not data:
break
m.update(data)
return m.hexdigest()
def full_backup(src_dir, dst_dir, md5file):
fname = os.path.basename(src_dir.rstrip('/'))
fname = '%s_full_%s.tar.gz' % (fname, time.strftime('%Y%m%d'))
fname = os.path.join(dst_dir, fname)
md5dict = {}
tar = tarfile.open(fname, 'w:gz')
tar.add(src_dir)
tar.close()
for path, folders, files in os.walk(src_dir):
for each_file in files:
key = os.path.join(path, each_file)
md5dict[key] = check_md5(key)
with open(md5file, 'wb') as fobj:
pickle.dump(md5dict, fobj)
def incr_backup(src_dir, dst_dir, md5file):
fname = os.path.basename(src_dir.rstrip('/'))
fname = '%s_incr_%s.tar.gz' % (fname, time.strftime('%Y%m%d'))
fname = os.path.join(dst_dir, fname)
md5dict = {}
with open(md5file, 'rb') as fobj:
oldmd5 = pickle.load(fobj)
for path, folders, files in os.walk(src_dir):
for each_file in files:
key = os.path.join(path, each_file)
md5dict[key] = check_md5(key)
with open(md5file, 'wb') as fobj:
pickle.dump(md5dict, fobj)
tar = tarfile.open(fname, 'w:gz')
for key in md5dict:
if oldmd5.get(key) != md5dict[key]:
tar.add(key)
tar.close()
if __name__ == '__main__':
# mkdir /tmp/demo; cp -r /etc/security /tmp/demo
src_dir = '/tmp/demo/security'
dst_dir = '/var/tmp/backup' # mkdir /var/tmp/backup
md5file = '/var/tmp/backup/md5.data'
if time.strftime('%a') == 'Mon':
full_backup(src_dir, dst_dir, md5file)
else:
incr_backup(src_dir, dst_dir, md5file)
