[Tutor] Executing a command from a specific directory

[Ansuman Dash]

Hi Kurt,

Sorry for the late reply.

My problem is resolved. Instead of "subprocess.Popen", I used
"subprocess.call".

Thanks all for your replies.

AD


On Fri, Sep 18, 2009 at 8:05 PM, Kurt Bendl <kurt at tool.net> wrote:

> Hello,
>
> On Sep 18, 2009, at 5:16 AM, Ansuman Dash wrote:
>
>  I have written it like that. It is like press 1 and it ll download file1
>> and press 2 it ll download file2 etc....
>>
>> But my question was I am using "time.sleep()" to make my script to wait
>> for the file download and then validate it in log file, so is there any
>> other way I can synchronize my code with the download.
>>
>> I am asking this because some files are very huge (120MB) and download
>> also depends on N/W bandwidth so sometimes it ll be done in 30mins and some
>> times it takes 60 mins. So I can't rely on "time.sleep()"
>>
>
>
> I had a similar problem.
> I used pyinotify on a linux box. inotify is a kernel hook
> that you can use to trigger actions on events... like when
> a file write is completed.
>
> Note: I'm a total hack at this. I'm sure there's a more
> elegant way to do what I'm dong, but I needed a fix fast,
> and this worked for me.  I'd appreciate any tips anyone has
> to offer to make this cleaner and/or more pythonic. :-)
>
> I'll be glad to try to answer any questions about this hackery.
>
>
> Best,
>  Kurt
>
>
> Here's a slightly cut-down version of my code:
> http://pastebin.com/f239b0413
>
> inotify_published_file_handler.py
> #####################################################
> #!/usr/bin/env python
> # -*- coding: utf-8 -*-
> # encoding: utf-8
> """
> inotify_published_file_handler.py
> rev. 20090706-01
> ----
>
> Created by Kurt Bendl.
>
>
> Usage
> ---------
> sudo su - www-data -c 'cd /web/log/; \
>    nohup /web/scripts/inotify_published_file_handler.py > \
>    /web/log/inotify-errors.txt 2>&1  &'
>
>
> Purpose
> ---------
> Monitor the $WEBROOT/aapracing/import/publish directory.
> Once a file is closed, act on it:
>
> 1. Copy the PDF and XML files from source_dir to web_filebin_dir
> 2. If the file is an.XML, copy it to the xml_ftp_dir
> 3. Make the dummy file for PHP publishing process
> 4. Remove the source file
>
> Requirements
> ------------
>  * Linux kernel 2.6.13 +
>  * pyinotify 2.8.6 +
>
>
> Installation
> --------------
> To install pyinotify on ubuntu/debian:
>
> `sudo easy_install pyinotify`
>
>
> Docs
> -----
> Docs on pyinotify can be found here:
> http://trac.dbzteam.org/pyinotify/wiki
>
> """
>
> import os
> import re
> import shutil
> import pyinotify
> import datetime
>
>
> ### production config info
> source_dir = "/web/site/aapracing/publish/data/publish/"
> web_filebin_dir = "/web/site/filebin/downloads/"
> reference_path = '/web/site/aapracing/publish/data/published/'
> xml_ftp_dir = "/home/ftp/private/xml/"
> filez = '(PDF|pdf|XML|xml|txt)'
> logfile_path = "/web/log/inotify.log"
>
> event_mask = pyinotify.IN_CLOSE_WRITE
> wm = pyinotify.WatchManager()
>
> def getNow():
>  """Just return the current time for timestamping logs"""
>  return datetime.datetime.now().strftime("%Y-%m-%d %H:%M:%S")
>
> def makeReferenceFile(tfile):
>  open(tfile, 'w').close()
>
>
> class SourceMonitor(pyinotify.ProcessEvent):
>  """ Watches the source dir for IN_CLOSE_WRITE event"""
>
>  def process_IN_CLOSE_WRITE(self, event):
>    """when an IN_CLOSE_WRITE happens, do something"""
>    if re.search('(.*\.'+filez+'$)', event.pathname):
>      # We have a match, put a copy into the filebin dir
>      shutil.copy2(event.pathname, web_filebin_dir)
>      logfile = open(logfile_path, "a")
>      logfile.write("%s: %s moved to %s. \n" %
>                    (getNow(), event.pathname, web_filebin_dir))
>      if re.search('(.*\.(XML|xml)$)', event.pathname):
>        # If it's and XML, put a copy in the FTP dir
>        shutil.copy2(event.pathname, xml_ftp_dir)
>        logfile.write("%s: %s moved to %s. \n" %
>                      (getNow(), event.pathname, xml_ftp_dir))
>      # Make the dummy file marker to enable PHP
>      # to know the file is really published
>      fhandle = os.path.basename(event.pathname)
>      open(reference_path + fhandle, 'w').close()
>      # Now, whack the source file since we're done with it.
>      os.remove(event.pathname)
>
> p = SourceMonitor()
> notifier = pyinotify.Notifier(wm, p)
> wdd = wm.add_watch(source_dir, event_mask)
> print "This should have been started with:\n\n"
> print "  sudo su - www-data -c 'cd /web/log/; nohup
> /web/scripts/inotify_published_file_handler.py >
>  /web/log/inotify-errors.txt 2>&1  &' \n\n"
>
> notifier.loop()
>
> --
> Kurt Bendl, Consultant
> Internet Tool & Die
> http://tool.net/
> 502-759-7104
>
>
>
>
>
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