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import unittest, random
from commontest import *
from rdiff_backup import librsync, log
def MakeRandomFile(path, length = None):
"""Writes a random file of given length, or random len if unspecified"""
if not length: length = random.randrange(5000, 100000)
fp = open(path, "wb")
fp_random = open('/dev/urandom', 'rb')
# Old slow way, may still be of use on systems without /dev/urandom
#randseq = []
#for i in xrange(random.randrange(5000, 30000)):
# randseq.append(chr(random.randrange(256)))
#fp.write("".join(randseq))
fp.write(fp_random.read(length))
fp.close()
fp_random.close()
class LibrsyncTest(unittest.TestCase):
"""Test various librsync wrapper functions"""
basis = RPath(Globals.local_connection, "testfiles/basis")
new = RPath(Globals.local_connection, "testfiles/new")
new2 = RPath(Globals.local_connection, "testfiles/new2")
sig = RPath(Globals.local_connection, "testfiles/signature")
sig2 = RPath(Globals.local_connection, "testfiles/signature2")
delta = RPath(Globals.local_connection, "testfiles/delta")
def sig_file_test_helper(self, blocksize, iterations, file_len = None):
"""Compare SigFile output to rdiff output at given blocksize"""
for i in range(iterations):
MakeRandomFile(self.basis.path, file_len)
if self.sig.lstat(): self.sig.delete()
assert not os.system("rdiff -b %s signature %s %s" %
(blocksize, self.basis.path, self.sig.path))
fp = self.sig.open("rb")
rdiff_sig = fp.read()
fp.close()
sf = librsync.SigFile(self.basis.open("rb"), blocksize)
librsync_sig = sf.read()
sf.close()
assert rdiff_sig == librsync_sig, \
(len(rdiff_sig), len(librsync_sig))
def testSigFile(self):
"""Make sure SigFile generates same data as rdiff, blocksize 512"""
self.sig_file_test_helper(512, 5)
def testSigFile2(self):
"""Test SigFile like above, but try various blocksize"""
self.sig_file_test_helper(2048, 1, 60000)
self.sig_file_test_helper(7168, 1, 6000)
self.sig_file_test_helper(204800, 1, 40*1024*1024)
def testSigGenerator(self):
"""Test SigGenerator, make sure it's same as SigFile"""
for i in range(5):
MakeRandomFile(self.basis.path)
sf = librsync.SigFile(self.basis.open("rb"))
sigfile_string = sf.read()
sf.close()
sig_gen = librsync.SigGenerator()
infile = self.basis.open("rb")
while 1:
buf = infile.read(1000)
if not buf: break
sig_gen.update(buf)
siggen_string = sig_gen.getsig()
assert sigfile_string == siggen_string, \
(len(sigfile_string), len(siggen_string))
def OldtestDelta(self):
"""Test delta generation against Rdiff"""
MakeRandomFile(self.basis.path)
assert not os.system("rdiff signature %s %s" %
(self.basis.path, self.sig.path))
for i in range(5):
MakeRandomFile(self.new.path)
assert not os.system("rdiff delta %s %s %s" %
(self.sig.path, self.new.path, self.delta.path))
fp = self.delta.open("rb")
rdiff_delta = fp.read()
fp.close()
df = librsync.DeltaFile(self.sig.open("rb"), self.new.open("rb"))
librsync_delta = df.read()
df.close()
print len(rdiff_delta), len(librsync_delta)
print repr(rdiff_delta[:100])
print repr(librsync_delta[:100])
assert rdiff_delta == librsync_delta
def testDelta(self):
"""Test delta generation by making sure rdiff can process output
There appears to be some undeterminism so we can't just
byte-compare the deltas produced by rdiff and DeltaFile.
"""
MakeRandomFile(self.basis.path)
assert not os.system("rdiff signature %s %s" %
(self.basis.path, self.sig.path))
for i in range(5):
MakeRandomFile(self.new.path)
df = librsync.DeltaFile(self.sig.open("rb"), self.new.open("rb"))
librsync_delta = df.read()
df.close()
fp = self.delta.open("wb")
fp.write(librsync_delta)
fp.close()
assert not os.system("rdiff patch %s %s %s" %
(self.basis.path, self.delta.path,
self.new2.path))
new_fp = self.new.open("rb")
new = new_fp.read()
new_fp.close()
new2_fp = self.new2.open("rb")
new2 = new2_fp.read()
new2_fp.close()
assert new == new2, (len(new), len(new2))
def testPatch(self):
"""Test patching against Rdiff"""
MakeRandomFile(self.basis.path)
assert not os.system("rdiff signature %s %s" %
(self.basis.path, self.sig.path))
for i in range(5):
MakeRandomFile(self.new.path)
assert not os.system("rdiff delta %s %s %s" %
(self.sig.path, self.new.path, self.delta.path))
fp = self.new.open("rb")
real_new = fp.read()
fp.close()
pf = librsync.PatchedFile(self.basis.open("rb"),
self.delta.open("rb"))
librsync_new = pf.read()
pf.close()
assert real_new == librsync_new, \
(len(real_new), len(librsync_new))
if __name__ == "__main__": unittest.main()
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