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#!/usr/bin/env python
"""Like rdiff, but written in python and uses librsync module.
Useful for benchmarking and testing of librsync and _librsync.
"""
import librsync, sys
blocksize = 32768
def makesig(inpath, outpath):
"""Write a signature of inpath at outpath"""
sf = librsync.SigFile(open(inpath, "rb"))
fout = open(outpath, "wb")
while 1:
buf = sf.read(blocksize)
if not buf: break
fout.write(buf)
assert not sf.close()
assert not fout.close()
def makedelta(sigpath, newpath, deltapath):
"""Write delta at deltapath using signature at sigpath"""
df = librsync.DeltaFile(open(sigpath, "rb"), open(newpath, "rb"))
fout = open(deltapath, "wb")
while 1:
buf = df.read(blocksize)
if not buf: break
fout.write(buf)
assert not df.close()
assert not fout.close()
def makepatch(basis_path, delta_path, new_path):
"""Write new given basis and delta"""
pf = librsync.PatchedFile(open(basis_path, "rb"), open(delta_path, "rb"))
fout = open(new_path, "wb")
while 1:
buf = pf.read(blocksize)
if not buf: break
fout.write(buf)
assert not pf.close()
assert not fout.close()
if sys.argv[1] == "signature":
makesig(sys.argv[2], sys.argv[3])
elif sys.argv[1] == "delta":
makedelta(sys.argv[2], sys.argv[3], sys.argv[4])
elif sys.argv[1] == "patch":
makepatch(sys.argv[2], sys.argv[3], sys.argv[4])
else: assert 0, "Bad mode argument %s" % (sys.argv[1],)
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