Python看门狗: Why is my subprocess called continuously?

Question

我是 Python 新手，我正在尝试与我的家庭服务器一致地自动同步。我发现了看门狗并且正在尝试使用它，但是每当我运行“touch test.txt”时，该脚本就会不断启动新的一致进程。由于观察者使用从队列继承的类，因此我认为它应该在将第一个事件从队列顶部弹出后阻塞。我在这里忽略了什么吗？

代码:

#!/usr/bin/python
import sys
import subprocess
import time
from watchdog.observers import Observer
from watchdog.events import FileSystemEventHandler

class ChangeHandler(FileSystemEventHandler):
   def on_any_event(self, event):
      subprocess.call(["/usr/bin/unison", "-batch", "-silent", "-ui", "text",
         "default"])

if __name__ == "__main__":
   observer = Observer()
   observer.schedule(ChangeHandler(), '/home/philip', True)
   observer.start()
   try:
      while True:
         time.sleep(1)
   except KeyboardInterrupt:
      observer.stop()
   observer.join()

输出:

props    <-?-> props      /  props    <-?-> props      Documents  props    <-?-> props      Downloads  props    <-?-> props      /  props    <-?-> props      Documents  props    <-?-> props      Downloads  props    <-?-> props      /  props    <-?-> props      Documents  props    <-?-> props      Downloads  props    <-?-> props      /  props    <-?-> props      Documents  props    <-?-> props      Downloads  props    <-?-> props      /  props    <-?-> props      Documents  props    <-?-> props      Downloads  props    <-?-> props      /  props    <-?-> props      Documents  props    <-?-> props      Downloads

Answer 1

OP 在评论中充分回答了这个问题:

It took working with pyinotify to finally understand that I'm synchronizing a directory while simultaneously watching that same directory for filesystem events. Of course, i'll get multiple calls unless I suspend the Observer/Notifier when processing an event.