实例如下：

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# -*- coding: utf-8 -*-
# @author flynetcn
import sys, os, pwd, stat, datetime;
LOG_FILE = '/var/log/checkDirPermission.log';
nginxWritableDirs = [
'/var/log/nginx',
'/usr/local/www/var',
];
otherReadableDirs = [
'/var/log/nginx',
'/usr/local/www/var/log',
];
dirs = [];
files = [];
def logger(level, str):
	logFd = open(LOG_FILE, 'a');
	logFd.write(datetime.datetime.now().strftime('%Y-%m-%d %H:%M:%S.%f')+": "+("WARNING " if level else "NOTICE ")+str);
	logFd.close();
def walktree(top, callback):
	for f in os.listdir(top):
		pathname = os.path.join(top, f);
		mode = os.stat(pathname).st_mode;
		if stat.S_ISDIR(mode):
			callback(pathname, True);
			walktree(pathname, callback);
		elif stat.S_ISREG(mode):
			callback(pathname, False);
		else:
			logger(1, "walktree skipping %s\n" % (pathname));
def collectPath(path, isDir=False):
	if isDir:
		dirs.append(path);
	else:
		files.append(path);
	
def checkNginxWritableDirs(paths):
	uid = pwd.getpwnam('nginx').pw_uid;
	gid = pwd.getpwnam('nginx').pw_gid;
	for d in paths:
		dstat = os.stat(d);
		if dstat.st_uid != uid:
			try:
				os.chown(d, uid, gid);
			except:
				logger(1, "chown(%s, nginx, nginx) failed\n" % (d));
def checkOtherReadableDirs(paths, isDir=False):
	for d in paths:
		dstat = os.stat(d);
		if isDir:
			checkMode = 5;
			willBeMode = dstat.st_mode | stat.S_IROTH | stat.S_IXOTH;
		else:
			checkMode = 4;
			willBeMode = dstat.st_mode | stat.S_IROTH;
		if int(oct(dstat.st_mode)[-1:]) & checkMode != checkMode:
			try:
					os.chmod(d, willBeMode);
			except:
				logger(1, "chmod(%s, %d) failed\n" % (d, oct(willBeMode)));
if __name__ == "__main__":
	for d in nginxWritableDirs:
		walktree(d, collectPath)
	dirs = dirs + files;
	checkNginxWritableDirs(dirs);
	dirs = [];
	files = [];
	for d in otherReadableDirs:
		walktree(d, collectPath)
	checkOtherReadableDirs(dirs, True);
	checkOtherReadableDirs(files, False);

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