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A Python 3 module which implements rsync binary diff algorithm.

Project Description

This is a fork of the pyrsync package with some changes such as:

  • The functions blockchecksums and rsyncdelta are now generators which make it easier to send through the network
  • Some unittests are added
  • Implementation changes (uses bytearray instead of a deque, faster hash lookup etc.)
  • The block size is no longer in the delta itself, it needs to be passed to the patchstream function
  • Does not use try/except for programming logic

It’s a Python 3 only package!

pyrsync2 is a Python module which implements the [rsync algorithm] [1], written in pure Python. It is not a wrapper for rsync, but a set of functions which apply full rsync functionality through Python.

The majority of the code for this module is taken from [Eric Pruitt’s post at ActiveState] [2]. It was orginally licensed under an [MIT license] [3], and this license has been kept wthout modifications.

## Installation

You need to have PIP:

$ sudo pip install pyrsync2

## Use

An example use case for this module:

# On the system containing the file that needs to be patched >>> import pyrsync2 >>> unpatched = open(“unpatched.file”, “rb”) >>> hashes = pyrsync2.blockchecksums(unpatched)

# On the remote system after having received hashes >>> import pyrsync2 >>> patchedfile = open(“patched.file”, “rb”) >>> delta = pyrsync2.rsyncdelta(patchedfile, hashes)

# System with the unpatched file after receiving delta >>> >>> save_to = open(“locally-patched.file”, “wb”) >>> pyrsync2.patchstream(unpatched, save_to, delta)

[1]: “Andrew Tridgell and Paul Mackerras. The rsync algorithm. Technical Report TR-CS-96-05, Canberra 0200 ACT, Australia, 1996.” [2]: “Rsync Algorithm (Python Recipe)” [3]: “OSI MIT License”

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