Как я запускаю скрипт Python каждый раз, когда файл создается в каталоге?
Так, я пытаюсь сделать это, несколько, простую задачу, но я еще не был успешен. Я надеюсь что изменения теперь.
Цель:
Выполненный /var/www/lager-scanner/filer/pluk_script.py каждый раз, когда существует новый файл в /var/www/lager-scanner/filer/Nav/FromNav, и выполненный это как www-data пользователь.
Есть ли кто-то там, как может сказать мне, как сделать это?
Все папки в /var/www принадлежат www-data пользователь и группа и имеют 775 полномочия.
2 ответа
Not a dupe, but in the accepted answer on this question, it is explained how to run a script (or any command) whenever a file is added or created in an arbitrary directory. In your case, the only needed event- trigger is:
-e create
Furthermore, since you are not using the path to the file as an argument, you can skip the --format -section.
The script to run in the background then simply is:
#!/bin/bash
DIR="/var/www/lager-scanner/filer/Nav/FromNav"
inotifywait -m -r -e create "$DIR" | while read f
do
# you may want to release the monkey after the test :)
echo monkey
# <whatever_command_or_script_you_liketorun>
done
Explanation
As explained in the linked question:
-e create
will notice new files created inside the directory.
The options:
-m -r
are to make the command run indefinitely ("monitor") and recursively in the directory.
According to this, using pyinotify is not the best option.
EDIT
In a comment you mention it does not work, and you mention the targeted folder is remote. Although not exactly the same, the issue seems related to this:
the change is not visible to the kernel; it happens entirely remotely.
A (tested) work around is to mount the remote folder locally.
Here is a trimmed down version of the example from the inotify page on PyPI
(https://pypi.python.org/pypi/inotify) to get you started:
import inotify.adapters
import os
notifier = inotify.adapters.Inotify()
notifier.add_watch('/home/student')
for event in notifier.event_gen():
if event is not None:
# print event # uncomment to see all events generated
if 'IN_CREATE' in event[1]:
print "file '{0}' created in '{1}'".format(event[3], event[2])
os.system("your_python_script_here.py")
It creates a Inotify object then adds a directory to watch using the add_watch() method. Next it creates a event generator from the Inotify object using the event_gen() method. Finally it iterate overs that generator
Now file operations that affect the watched directory will generate one or more events. Each event takes the form of a tuple with four values:
- An _INOTIFY_EVENT tuple (omitted in the output below for clarity)
- A list of strings describing the events
- The name of the directory affected
- The name of the file affected
Running the above example with the first print statement uncommented and then creating the file 'new' in the watched directory gives this output:
( (...), ['IN_CREATE'], '/home/student', 'new') file 'new' created in '/home/student' ( (...), ['IN_ISDIR', 'IN_OPEN'], '/home/student', '') ( (...), ['IN_ISDIR', 'IN_CLOSE_NOWRITE'/home/student', '') ( (...), ['IN_OPEN'], '/home/student', 'new') ( (...), ['IN_ATTRIB'], '/home/student', 'new') ( (...), ['IN_CLOSE_WRITE'], '/home/student', 'new')
Since the 'IN_CREATE' event occurs when a new file is created, this is where you would add whatever code you wanted to run.