launchd自动备份FTP数据

昨天心血来潮搞的…

launchd是从Tiger开始加的系统服务加载系统, 大意就是可以让你按照某个特定的条件来触发某个程序的执行. 具体介绍可以看这里.

然后要做的就是

• 写个python脚本从FTP把整个网站拖下来
• launchd每星期自动执行一次这个脚本

FTP下载的脚本

就着ftplib的Sample写的, 可能会有Bug...

	#! /usr/bin/python
	### Copy everything on a FTP server to a local folder
	from ftplib import FTP
	import os.path
	import datetime
	def main():
	#fill in the parameters here
	ftpaddress = '1.1.1.1'
	username = 'user'
	password = 'pass'
	backupfolder = '~/backup'
	#create dir for today
	backupfolder = os.path.expanduser(backupfolder)
	if not os.path.exists(backupfolder):
	os.makedirs(backupfolder)
	os.chdir(backupfolder)
	d = datetime.date.today()
	localdir = d.strftime("%Y%m%d")
	if not os.path.exists(localdir):
	os.mkdir(localdir)
	os.chdir(localdir)
	#login FTP
	f = FTP(ftpaddress)
	f.login(username,password)
	print ('logging in')
	backupdir(f,'htdocs','htdocs')
	if not os.path.exists('done'):
	os.makedirs('done')
	f.close()
	def backupdir(f, remotedir, localdir):
	print 'current remote dir: ', remotedir
	print 'current local dir: ', os.path.abspath(localdir)
	try:
	f.cwd(remotedir)
	except ftplib.error_perm, msg:
	print "Can't chdir to", remotedir, ":", msg
	else:
	#prepare local dir
	if not os.path.exists(localdir):
	os.mkdir(localdir)
	os.chdir(localdir)
	subdirs = []
	listing = []
	filesfound = []
	f.retrlines('LIST', listing.append)
	for line in listing:
	words = line.split(None, 8)
	filename = words[-1].lstrip()
	mode = words[0]
	if mode[0] == 'd':
	subdirs.append(filename)
	continue
	else:
	filesfound.append(filename)
	for file in filesfound:
	savefile(f, file)
	for subdir in subdirs:
	backupdir(f, subdir, subdir)
	f.cwd('..')
	os.chdir('..')
	def savefile(f, filename):
	print "copying:", os.path.abspath(filename)
	#delete local copy first
	if(os.path.exists(filename)):
	os.remove(filename)
	#then duplicate
	try:
	fp = open(filename, 'wb')
	except IOError, msg:
	print "Can't create %r: %s" % (filename, msg)
	else:
	try:
	f.retrbinary('RETR ' + filename, fp.write)
	except ftplib.error_perm, msg:
	print msg
	fp.close()
	if __name__ == '__main__':
	main()

view raw ftpbackup.py hosted with ❤ by GitHub

(Link)

launchd的配置文件

	<?xml version="1.0" encoding="UTF-8"?>
	<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
	<plist version="1.0">
	<dict>
	<key>Label</key>
	<string>com.lizdo.ftpbackupweekly.plist</string>
	<key>Program</key>
	<string>/Users/Liz/Library/Scripts/FTPAutoBackup.php</string>
	<key>LowPriorityIO</key>
	<true/>
	<key>Nice</key>
	<integer>1</integer>
	<key>StartCalendarInterval</key>
	<dict>
	<key>Hour</key>
	<integer>0</integer>
	<key>Minute</key>
	<integer>25</integer>
	<key>Weekday</key>
	<integer>2</integer>
	</dict>
	</dict>
	</plist>

view raw gistfile1.xsl hosted with ❤ by GitHub

(Link)

每个launchd项目都要写个plist作为配置文件, 然后按其中的label命名放在~/Library/LaunchAgents里. 详细语法可以看这里.

搞定以后把它手动加到launchctl里, 不过每次开机也会自动scan上面的LaunchAgent目录

launchctl load ~/Library/LaunchAgents
launchctl list

list以后就可以看到服务在list里面了, 到时间就会在后台偷偷运行… 如果时间错过了会等到下次开机, 很智能的哦.