bisect-skip-count

#!/usr/bin/env python
# This script is used to bisect skip and count arguments for --debug-counter.
# It is similar to bisect, except it understands how to increase skip and decrease count
#
# Typical usage:
#
# bisect-skip-count bisect-command.sh "%(skip)d" "%(count)d" 2>&1 | tee bisect.out
#
# bisect-command.sh is something like this:
# #! /bin/bash
#
# skip=$1
# count=$2
#
# opt -debug-counter=my-counter-skip=${skip},my-counter-count=${count}
# ... Test output of opt and exit zero for pass, non-zero for fail
#
# Examine bisect.out to look for "Last good skip" and "Last good
# count" to find the values of the counter that produce a passing
# result. Incrementing the last good count by one or decrementing the
# last good skip by one should produce a failure.
#
from __future__ importprint_function
importos
importsys
importargparse
# This is for timeout support. Use the recommended way of import.
# We do timeouts because when doing, execution testing, we have a habit
# of finding variants that infinite loop
ifos.name=='posix'andsys.version_info[0] <3:
importsubprocess32assubprocess
else:
importsubprocess
parser=argparse.ArgumentParser()

parser.add_argument('--skipstart', type=int, default=0)
parser.add_argument('--skipend', type=int, default=(1<<32))
parser.add_argument('--countstart', type=int, default=0)
parser.add_argument('--countend', type=int, default=(1<<32))
parser.add_argument('--timeout', type=int, default=None)
# Use shell support if you need to use complex shell expressions in your command
parser.add_argument('--shell', type=bool, default=False)
parser.add_argument('command', nargs='+')

args=parser.parse_args()

start=args.skipstart
end=args.skipend

print("Bisect of Skip starting!")
print("Start: %d"%start)
print("End: %d"%end)

last=None
whilestart!=endandstart!=end-1:
count=start+ (end-start)//2
print("Visiting Skip: %d with (Start, End) = (%d,%d)"% (count, start, end))
cmd= [x% {'skip':count, 'count':-1} forxinargs.command]
print(cmd)
try:
result=subprocess.call(cmd, shell=args.shell, timeout=args.timeout)
ifresult==0:
print(" PASSES! Setting end to count")
end=count
else:
print(" FAILS! Setting start to count")
start=count
except:
print(" TIMEOUT, setting end to count")
end=count
firstcount=start
print("Last good skip: %d"%start)
start=args.countstart
end=args.countend
print("Bisect of Count starting!")
print("Start: %d"%start)
print("End: %d"%end)
whilestart!=endandstart!=end-1:
count=start+ (end-start)//2
print("Visiting Count: %d with (Start, End) = (%d,%d)"% (count, start, end))
cmd= [x% {'count':count, 'skip':firstcount } forxinargs.command]
print(cmd)
try:
result=subprocess.call(cmd, shell=args.shell, timeout=args.timeout)
ifresult==0:
print(" PASSES! Setting start to count")
start=count
else:
print(" FAILS! Setting end to count")
end=count
except:
print(" TIMEOUT, setting start to count")
start=count

print("Last good count: %d"%start)