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Python pyinotify文件系统监控


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Pyinotify是一个Python模块,用来监测文件系统的变化。 Pyinotify依赖于Linux内核的功能—inotify(内核2.6.13合并)。 inotify的是一个事件驱动的通知器,其通知接口通过三个系统调用从内核空间到用户空间。pyinotify结合这些系统调用,并提供一个顶级的抽象和一个通用的方式来处理这些功能。

  • pyinotify 说百了就是通过 调用系统的inotify来实现通知的

  • inotify 既可以监视文件,也可以监视目录

  • Inotify 使用系统调用而非 SIGIO 来通知文件系统事件。

Inotify 可以监视的文件系统事件包括:

Event Name

Is an Event

Description

IN_ACCESS

Yes

file was accessed.

IN_ATTRIB

Yes

metadata changed.

IN_CLOSE_NOWRITE

Yes

unwrittable file was closed.

IN_CLOSE_WRITE

Yes

writtable file was closed.

IN_CREATE

Yes

file/dir was created in watched directory.

IN_DELETE

Yes

file/dir was deleted in watched directory.

IN_DELETE_SELF

Yes

自删除,即一个可执行文件在执行时删除自己

IN_DONT_FOLLOW

No

don’t follow a symlink (lk 2.6.15).

IN_IGNORED

Yes

raised on watched item removing. Probably useless for you, prefer instead IN_DELETE*.

IN_ISDIR

No

event occurred against directory. It is always piggybacked to an event. The Event structure automatically provide this information (via .is_dir)

IN_MASK_ADD

No

to update a mask without overwriting the previous value (lk 2.6.14). Useful when updating a watch.

IN_MODIFY

Yes

file was modified.

IN_MOVE_SELF

Yes

自移动,即一个可执行文件在执行时移动自己

IN_MOVED_FROM

Yes

file/dir in a watched dir was moved from X. Can trace the full move of an item when IN_MOVED_TO is available too, in this case if the moved item is itself watched, its path will be updated (see IN_MOVE_SELF).

IN_MOVED_TO

Yes

file/dir was moved to Y in a watched dir (see IN_MOVE_FROM).

IN_ONLYDIR

No

only watch the path if it is a directory (lk 2.6.15). Usable when calling .add_watch.

IN_OPEN

Yes

file was opened.

IN_Q_OVERFLOW

Yes

event queued overflowed. This event doesn’t belongs to any particular watch.

IN_UNMOUNT

Yes

宿主文件系统被 umount

通过pyinotify来实现对文件系统的监控非常简单

#!/usr/bin/env python

# encoding:utf-8

 

import os

from  pyinotify import  WatchManager, Notifier, \

ProcessEvent,IN_DELETE, IN_CREATE,IN_MODIFY

 

class EventHandler(ProcessEvent):

    """事件处理"""

    def process_IN_CREATE(self, event):

        print   "Create file: %s "  %   os.path.join(event.path,event.name)

 

    def process_IN_DELETE(self, event):

        print   "Delete file: %s "  %   os.path.join(event.path,event.name)

 

    def process_IN_MODIFY(self, event):

            print   "Modify file: %s "  %   os.path.join(event.path,event.name)

 

def FSMonitor(path='.'):

        wm = WatchManager() 

        mask = IN_DELETE | IN_CREATE |IN_MODIFY

        notifier = Notifier(wm, EventHandler())

        wm.add_watch(path, mask,rec=True)

        print 'now starting monitor %s'%(path)

        while True:

                try:

                        notifier.process_events()

                        if notifier.check_events():

                                notifier.read_events()

                except KeyboardInterrupt:

                        notifier.stop()

                        break

 

if __name__ == "__main__":

    FSMonitor()


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