A Python 3 module which implements rsync binary diff algorithm.
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] , 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] . It was orginally licensed under an [MIT license] , and this license has been kept wthout modifications.
You need to have PIP:
$ sudo pip install pyrsync2
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 >>> unpatched.seek(0) >>> save_to = open(“locally-patched.file”, “wb”) >>> pyrsync2.patchstream(unpatched, save_to, delta)
: http://samba.anu.edu.au/rsync/ “Andrew Tridgell and Paul Mackerras. The rsync algorithm. Technical Report TR-CS-96-05, Canberra 0200 ACT, Australia, 1996.” : https://code.activestate.com/recipes/577518-rsync-algorithm/ “Rsync Algorithm (Python Recipe)” : http://www.opensource.org/licenses/mit-license.php “OSI MIT License”