update_TransmissionBT_resumes.py

#! /usr/bin/env python2
# update_TransmissionBT_resumes.py
#
# Goes through the Transmission resume/ directory and changes the destinations
# of the transfers from the old_location to the new_location. This assumes that
# the transfer directories have been mirrored perfectly from the old_location
# to the new_location. TransmissionBT must not be running while this script is
# executed. More information about the resume files can be found at 
# https://trac.transmissionbt.com/wiki/ResumeFile . Uses the bencode library
# available on pypi.

from bencode import *
import os, os.path

old_location = '/Volumes/Data (Alice)'
new_location = '/Volumes/Data (Bob)'

resume_directory = os.path.expanduser('~/Library/Application Support/Transmission/Resume')

resume_files = [os.path.join(resume_directory, x) for x in os.listdir(resume_directory)]

for filename in resume_files:
	print 'processing "%s"'%(filename,)
	with open(filename,'rb') as f:
		resume_raw = f.read()
	resume_decoded = bdecode(resume_raw)
	resume_decoded['destination'] = resume_decoded['destination'].replace(old_location, new_location)
	resume_encoded = bencode(resume_decoded)
	with open(filename,'wb') as f:
		f.write(resume_encoded)