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#!/usr/bin/env python3
#
# Copyright 2024 The Chromium Authors
# Use of this source code is governed by a BSD-style license that can be
# found in the LICENSE file.
"""List the fuzzers within a fuzztest and confirm they match what we expect.
Invoked by GN from fuzzer_test.gni.
"""
import argparse
import os
import re
import subprocess
import sys
# //build imports.
sys.path.append(
os.path.join(
os.path.dirname(os.path.abspath(__file__)),
os.pardir,
os.pardir,
'build',
))
import action_helpers
def CreateArgumentParser():
"""Creates an argparse.ArgumentParser instance."""
parser = argparse.ArgumentParser(description='Generate fuzztest fuzzers.')
parser.add_argument('--executable',
help='Executable to interrogate for present fuzztests.')
parser.add_argument(
'--output',
help='Path to the output file (which will be intentionally blank).',
)
parser.add_argument('--fuzztests',
nargs='+',
help='List of fuzztests we expect to find.')
return parser
def main():
parser = CreateArgumentParser()
args = parser.parse_args()
expected_tests = set(args.fuzztests)
env = os.environ
env['ASAN_OPTIONS'] = 'detect_odr_violation=0'
process_result = subprocess.run([args.executable, '--list_fuzz_tests=1'],
env=env,
stdout=subprocess.PIPE,
check=False)
if process_result.returncode == 0:
test_list = process_result.stdout.decode('utf-8')
actual_tests = re.findall('Fuzz test: (.*)', test_list)
# Gardeners may disable fuzztests by changing the names of the fuzztest
# in code to start with DISABLED_. We don't want gardeners to need to
# change gn files correspondingly, so strip such prefixes when checking
# that the test lists match.
actual_tests = {
test.replace('DISABLED_', '').replace('FLAKY_', '')
for test in actual_tests
}
if expected_tests != actual_tests:
print('Unexpected fuzztests found in this binary.\nFuzztest binary: ' +
args.executable + '\n' +
'Expected fuzztests (as declared by the gn "fuzztests" variable on'
' this target): ' + str(expected_tests) +
'\nActual tests (as found in the binary): ' + str(actual_tests) +
'\nYou probably need to update the gn variable to match the tests'
' actually in the binary.')
sys.exit(-1)
# If we couldn't run the fuzztest binary itself, we'll
# regard that as fine. This is a best-efforts check that the
# gn 'fuzztests' variable is correct, and sometimes fuzzers don't
# run on LUCI e.g. due to lack of dependencies.
with action_helpers.atomic_output(args.output) as output:
output.write(''.encode('utf-8'))
if __name__ == '__main__':
main()
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