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#!/usr/bin/env python
# -*- Python -*-
from __future__ import division
import sys
from math import log, ceil
from optparse import OptionParser
import subprocess
# crack the command line
parser = OptionParser(
usage="%prog lower-revision upper-revision test_script [arg1 ...]",
description="Binary search for a bug in a SVN checkout")
(options,script_args) = parser.parse_args()
# make sure we have sufficient parameters
if len(script_args) < 1:
parser.error("Need a lower revision")
elif len(script_args) < 2:
parser.error("Need an upper revision")
elif len(script_args) < 3:
parser.error("Need a script to run")
# extract our starting values
lower = int(script_args[0])
upper = int(script_args[1])
script = script_args[2:]
# print an error message and quit
def error(s):
print >>sys.stderr, "******", s, "******"
sys.exit(1)
# update to the specified version and run test
def testfail(revision):
"Return true if test fails"
print "Updating to revision", revision
if subprocess.call(["svn","up","-qr",str(revision)]) != 0:
m = "SVN did not update properly to revision %d"
raise RuntimeError(m % revision)
return subprocess.call(script,shell=False) != 0
# confirm that the endpoints are different
print "****** Checking upper bracket", upper
upperfails = testfail(upper)
print "****** Checking lower bracket", lower
lowerfails = testfail(lower)
if upperfails == lowerfails:
error("Upper and lower revisions must bracket the failure")
# binary search for transition
msg = "****** max %d revisions to test (bug bracketed by [%d,%d])"
while upper-lower > 1:
print msg % (ceil(log(upper-lower,2)), lower, upper)
mid = (lower + upper)//2
midfails = testfail(mid)
if midfails == lowerfails:
lower = mid
lowerfails = midfails
else:
upper = mid
upperfails = midfails
# show which revision was first to fail
if upperfails != lowerfails: lower = upper
print "The error was caused by revision", lower
# Local Variables:
# tab-width:4
# indent-tabs-mode:nil
# End:
# vim: set expandtab tabstop=4 shiftwidth=4:
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