[LearnAdmin] Python script to check if file is locked also display last modified time

[Naresh Surampudi]

To lock file for testing use this command 

The below command will lock /home/ubuntu/fileloc

flock -x -w 5 /home/ubuntu/fileloc echo "4" >  /home/ubuntu/fileloc && sleep 5

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test.py

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import os, time

import datetime as dt

def is_locked(filepath):

    """Checks if a file is locked by opening it in append mode.

    If no exception thrown, then the file is not locked.

    """

    locked = None

    file_object = None

    if os.path.exists(filepath):

        try:

            print "Trying to open %s." % filepath

            buffer_size = 8

            # Opening file in append mode and read the first 8 characters.

            file_object = open(filepath, 'a', buffer_size)

            if file_object:

                print "%s is not locked." % filepath

                locked = False

        except IOError, message:

            print "File is locked (unable to open in append mode). %s." % \

                  message

            locked = True

        finally:

            if file_object:

                file_object.close()

                print "%s closed." % filepath

    else:

        print "%s not found." % filepath

    return locked

def wait_for_files(filepaths):

    """Checks if the files are ready.

    For a file to be ready it must exist and can be opened in append

    mode.

    """

 #   now=dt.datetime.now()

 #   ago=now-dt.timedelta(minutes=4)

    for filepath in filepaths:

        # If the file exists but locked, wait wait_time seconds and check

        # again until it's no longer locked by another process.

       if is_locked(filepath):

            print "%s is currently in use." % \

                  (filepath)

            st = os.stat(filepath)    

            mtime = dt.datetime.fromtimestamp(st.st_mtime)

            print('%s modified %s'%(filepath, mtime))

                

# Test

if __name__ == '__main__':

    files = [r"/home/ubuntu/filelock"]

    print wait_for_files(files)

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python test.py

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Posted By Naresh Surampudi to LearnAdmin at 8/04/2017 11:46:00 AM