tarfile Progress Extension

This module is a wrapper around the standard tarfile library in Python. It adds the ability to pass a progress callback to the following TarFile methods:

• TarFile.add()
• TarFile.addfile()
• TarFile.extractall()
• TarFile.extract()
• TarFile.extractfile()

Each of those methods has a new progress argument. Any function passed to the progress argument will be called once per percentage increace, with a single integer value between 0 and 100.

This module is a drop-in replacement for the standard tarfile library, and should only require the import statments be changes.

Notes

When you use the TarFile.add() method your callback will receive a percentage complete for each file as it is added, rather than for the entire operation.

This means that when displaying information to users you need make it clear the the progress bar will fill up multiple times, once for each file added.

This also applies to the TarFile.extractall() method, if the input tar file is a stream. If the input tar file is a bog standard file then your callback will receive a percentage complete for the entire operation.

Examples

Replacing tarfile with tarfile_progress

Replace the following:

import tarfile

with

from tarfile_progress import tarfile_progress as tarfile

From the command line

This example uses the included example function, and is done from the command line.

>>> from tarfile_progress import tarfile_progress as tarfile
>>> tar = tarfile.open('test.tar', 'w')
>>> tar.add('monty', progress = tarfile.progressprint)
|##################################################| 100% File complete
>>> tar.extractall(tarfile.progressprint)
|##################################################| 100% File complete

Setting up a callback

This uses the included example function.

from tarfile_progress import tarfile_progress as tarfile

print 'Opening a new file'

# Open up a new tar file for writing
tar = tarfile.open('test.tar', 'w')

print 'Adding a new file'

# Add a new file to it, and pass it the progress callback
tar.add('monty', progress = tarfile.progressprint)

print 'Extracting files'

# Extract all the files, with progress
tar.extractall(progress = tarfile.progressprint)

This will result in the following output

Opening a new file
Adding a new file
|##################################################| 100% File complete
Extracting files
|##################################################| 100% File complete