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POPython Watchdog: Why is my subprocess called continuously?
 

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  1. POPython Watchdog: Why is my subprocess called continuously?
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    <p>I'm a novice with Python &amp; I'm trying to automate synchronization with my home server with unison. I discovered watchdog &amp; I'm trying to use it, but whenever I run "touch test.txt", the script continuously launches new unison processes. Since the observer is using classes inherited from Queue, I assumed that it should just block after it pops the first event off the top of the queue. Have I overlooked something here?</p> <p>Code:</p> <pre><code>#!/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() </code></pre> <p>Output:</p> <pre><code>props &lt;-?-&gt; props / props &lt;-?-&gt; props Documents props &lt;-?-&gt; props Downloads props &lt;-?-&gt; props / props &lt;-?-&gt; props Documents props &lt;-?-&gt; props Downloads props &lt;-?-&gt; props / props &lt;-?-&gt; props Documents props &lt;-?-&gt; props Downloads props &lt;-?-&gt; props / props &lt;-?-&gt; props Documents props &lt;-?-&gt; props Downloads props &lt;-?-&gt; props / props &lt;-?-&gt; props Documents props &lt;-?-&gt; props Downloads props &lt;-?-&gt; props / props &lt;-?-&gt; props Documents props &lt;-?-&gt; props Downloads </code></pre>
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    1. USPhilip Hoffman
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      1. USMartin
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    1. COwhile True: time.sleep(1) looks like this will go on until the time itself comes to an end...
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      1. POPython Watchdog: Why is my subprocess called continuously?
      1. USJingo
    2. CO@Jingo or, more likely, until the user presses a 'Ctrl+C' and causes a `KeyboardInterrupt`...
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      1. POPython Watchdog: Why is my subprocess called continuously?
      1. USPierre GM
    3. COIt 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.
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      1. POPython Watchdog: Why is my subprocess called continuously?
      1. USPhilip Hoffman
 

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