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#!/usr/bin/env python3
"""
Command line tool to bisect failing CPython tests.
Find the test_os test method which alters the environment:
./python -m test.bisect_cmd --fail-env-changed test_os
Find a reference leak in "test_os", write the list of failing tests into the
"bisect" file:
./python -m test.bisect_cmd -o bisect -R 3:3 test_os
Load an existing list of tests from a file using -i option:
./python -m test --list-cases -m FileTests test_os > tests
./python -m test.bisect_cmd -i tests test_os
"""
import argparse
import datetime
import os.path
import math
import random
import subprocess
import sys
import tempfile
import time
def write_tests(filename, tests):
with open(filename, "w") as fp:
for name in tests:
print(name, file=fp)
fp.flush()
def write_output(filename, tests):
if not filename:
return
print("Writing %s tests into %s" % (len(tests), filename))
write_tests(filename, tests)
return filename
def format_shell_args(args):
return ' '.join(args)
def list_cases(args):
cmd = [sys.executable, '-m', 'test', '--list-cases']
cmd.extend(args.test_args)
proc = subprocess.run(cmd,
stdout=subprocess.PIPE,
universal_newlines=True)
exitcode = proc.returncode
if exitcode:
cmd = format_shell_args(cmd)
print("Failed to list tests: %s failed with exit code %s"
% (cmd, exitcode))
sys.exit(exitcode)
tests = proc.stdout.splitlines()
return tests
def run_tests(args, tests, huntrleaks=None):
tmp = tempfile.mktemp()
try:
write_tests(tmp, tests)
cmd = [sys.executable, '-m', 'test', '--matchfile', tmp]
cmd.extend(args.test_args)
print("+ %s" % format_shell_args(cmd))
proc = subprocess.run(cmd)
return proc.returncode
finally:
if os.path.exists(tmp):
os.unlink(tmp)
def parse_args():
parser = argparse.ArgumentParser()
parser.add_argument('-i', '--input',
help='Test names produced by --list-tests written '
'into a file. If not set, run --list-tests')
parser.add_argument('-o', '--output',
help='Result of the bisection')
parser.add_argument('-n', '--max-tests', type=int, default=1,
help='Maximum number of tests to stop the bisection '
'(default: 1)')
parser.add_argument('-N', '--max-iter', type=int, default=100,
help='Maximum number of bisection iterations '
'(default: 100)')
# FIXME: document that following arguments are test arguments
args, test_args = parser.parse_known_args()
args.test_args = test_args
return args
def main():
args = parse_args()
if args.input:
with open(args.input) as fp:
tests = [line.strip() for line in fp]
else:
tests = list_cases(args)
print("Start bisection with %s tests" % len(tests))
print("Test arguments: %s" % format_shell_args(args.test_args))
print("Bisection will stop when getting %s or less tests "
"(-n/--max-tests option), or after %s iterations "
"(-N/--max-iter option)"
% (args.max_tests, args.max_iter))
output = write_output(args.output, tests)
print()
start_time = time.monotonic()
iteration = 1
try:
while len(tests) > args.max_tests and iteration <= args.max_iter:
ntest = len(tests)
ntest = max(ntest // 2, 1)
subtests = random.sample(tests, ntest)
print("[+] Iteration %s: run %s tests/%s"
% (iteration, len(subtests), len(tests)))
print()
exitcode = run_tests(args, subtests)
print("ran %s tests/%s" % (ntest, len(tests)))
print("exit", exitcode)
if exitcode:
print("Tests failed: continuing with this subtest")
tests = subtests
output = write_output(args.output, tests)
else:
print("Tests succeeded: skipping this subtest, trying a new subset")
print()
iteration += 1
except KeyboardInterrupt:
print()
print("Bisection interrupted!")
print()
print("Tests (%s):" % len(tests))
for test in tests:
print("* %s" % test)
print()
if output:
print("Output written into %s" % output)
dt = math.ceil(time.monotonic() - start_time)
if len(tests) <= args.max_tests:
print("Bisection completed in %s iterations and %s"
% (iteration, datetime.timedelta(seconds=dt)))
sys.exit(1)
else:
print("Bisection failed after %s iterations and %s"
% (iteration, datetime.timedelta(seconds=dt)))
if __name__ == "__main__":
main()
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