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 NameIs an EventDescriptionIN_ACCESSYesfile was accessed.IN_ATTRIBYesmetadata changed.IN_CLOSE_NOWRITEYesunwrittable file was closed.IN_CLOSE_WRITEYeswrittable file was closed.IN_CREATEYesfile/dir was created in watched directory.IN_DELETEYesfile/dir was deleted in watched directory.IN_DELETE_SELFYes自删除,即一个可执行文件在执行时删除自己IN_DONT_FOLLOWNodon’t follow a symlink (lk 2.6.15).IN_IGNOREDYesraised on watched item removing. Probably useless for you, prefer instead IN_DELETE*.IN_ISDIRNoevent occurred against directory. It is always piggybacked to an event. The Event structure automatically provide this information (via .is_dir)IN_MASK_ADDNoto update a mask without overwriting the previous value (lk 2.6.14). Useful when updating a watch.IN_MODIFYYesfile was modified.IN_MOVE_SELFYes自移动,即一个可执行文件在执行时移动自己IN_MOVED_FROMYesfile/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_TOYesfile/dir was moved to Y in a watched dir (see IN_MOVE_FROM).IN_ONLYDIRNoonly watch the path if it is a directory (lk 2.6.15). Usable when calling .add_watch.IN_OPENYesfile was opened.IN_Q_OVERFLOWYesevent queued overflowed. This event doesn’t belongs to any particular watch.IN_UNMOUNTYes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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