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#!/usr/bin/env python3
# -*- coding: utf-8 -*-
# Copyright 2019 The Chromium OS Authors. All rights reserved.
# Use of this source code is governed by a BSD-style license that can be
# found in the LICENSE file.
"""Performs bisection on LLVM based off a .JSON file."""
from __future__ import print_function
import enum
import json
import os
import subprocess
import sys
import time
import traceback
import chroot
from llvm_bisection import BisectionExitStatus
import llvm_bisection
import update_tryjob_status
# Used to re-try for 'llvm_bisection.py' to attempt to launch more tryjobs.
BISECTION_RETRY_TIME_SECS = 10 * 60
# Wait time to then poll each tryjob whose 'status' value is 'pending'.
POLL_RETRY_TIME_SECS = 30 * 60
# The number of attempts for 'llvm_bisection.py' to launch more tryjobs.
#
# It is reset (break out of the `for` loop/ exit the program) if successfully
# launched more tryjobs or bisection is finished (no more revisions between
# start and end of the bisection).
BISECTION_ATTEMPTS = 3
# The limit for updating all tryjobs whose 'status' is 'pending'.
#
# If the time that has passed for polling exceeds this value, then the program
# will exit with the appropriate exit code.
POLLING_LIMIT_SECS = 18 * 60 * 60
class BuilderStatus(enum.Enum):
"""Actual values given via 'cros buildresult'."""
PASS = 'pass'
FAIL = 'fail'
RUNNING = 'running'
builder_status_mapping = {
BuilderStatus.PASS.value: update_tryjob_status.TryjobStatus.GOOD.value,
BuilderStatus.FAIL.value: update_tryjob_status.TryjobStatus.BAD.value,
BuilderStatus.RUNNING.value: update_tryjob_status.TryjobStatus.PENDING.value
}
def GetBuildResult(chroot_path, buildbucket_id):
"""Returns the conversion of the result of 'cros buildresult'."""
# Calls 'cros buildresult' to get the status of the tryjob.
try:
tryjob_json = subprocess.check_output(
[
'cros_sdk', '--', 'cros', 'buildresult', '--buildbucket-id',
str(buildbucket_id), '--report', 'json'
],
cwd=chroot_path,
stderr=subprocess.STDOUT,
encoding='UTF-8',
)
except subprocess.CalledProcessError as err:
if 'No build found. Perhaps not started' not in err.output:
raise
return None
tryjob_content = json.loads(tryjob_json)
build_result = str(tryjob_content['%d' % buildbucket_id]['status'])
# The string returned by 'cros buildresult' might not be in the mapping.
if build_result not in builder_status_mapping:
raise ValueError('"cros buildresult" return value is invalid: %s' %
build_result)
return builder_status_mapping[build_result]
def main():
"""Bisects LLVM using the result of `cros buildresult` of each tryjob.
Raises:
AssertionError: The script was run inside the chroot.
"""
chroot.VerifyOutsideChroot()
args_output = llvm_bisection.GetCommandLineArgs()
if os.path.isfile(args_output.last_tested):
print('Resuming bisection for %s' % args_output.last_tested)
else:
print('Starting a new bisection for %s' % args_output.last_tested)
while True:
# Update the status of existing tryjobs
if os.path.isfile(args_output.last_tested):
update_start_time = time.time()
with open(args_output.last_tested) as json_file:
json_dict = json.load(json_file)
while True:
print('\nAttempting to update all tryjobs whose "status" is '
'"pending":')
print('-' * 40)
completed = True
for tryjob in json_dict['jobs']:
if tryjob[
'status'] == update_tryjob_status.TryjobStatus.PENDING.value:
status = GetBuildResult(args_output.chroot_path,
tryjob['buildbucket_id'])
if status:
tryjob['status'] = status
else:
completed = False
print('-' * 40)
# Proceed to the next step if all the existing tryjobs have completed.
if completed:
break
delta_time = time.time() - update_start_time
if delta_time > POLLING_LIMIT_SECS:
# Something is wrong with updating the tryjobs's 'status' via
# `cros buildresult` (e.g. network issue, etc.).
sys.exit('Failed to update pending tryjobs.')
print('-' * 40)
print('Sleeping for %d minutes.' % (POLL_RETRY_TIME_SECS // 60))
time.sleep(POLL_RETRY_TIME_SECS)
# There should always be update from the tryjobs launched in the
# last iteration.
temp_filename = '%s.new' % args_output.last_tested
with open(temp_filename, 'w') as temp_file:
json.dump(json_dict, temp_file, indent=4, separators=(',', ': '))
os.rename(temp_filename, args_output.last_tested)
# Launch more tryjobs.
for cur_try in range(1, BISECTION_ATTEMPTS + 1):
try:
print('\nAttempting to launch more tryjobs if possible:')
print('-' * 40)
bisection_ret = llvm_bisection.main(args_output)
print('-' * 40)
# Stop if the bisection has completed.
if bisection_ret == BisectionExitStatus.BISECTION_COMPLETE.value:
sys.exit(0)
# Successfully launched more tryjobs.
break
except Exception:
traceback.print_exc()
print('-' * 40)
# Exceeded the number of times to launch more tryjobs.
if cur_try == BISECTION_ATTEMPTS:
sys.exit('Unable to continue bisection.')
num_retries_left = BISECTION_ATTEMPTS - cur_try
print('Retries left to continue bisection %d.' % num_retries_left)
print('Sleeping for %d minutes.' % (BISECTION_RETRY_TIME_SECS // 60))
time.sleep(BISECTION_RETRY_TIME_SECS)
if __name__ == '__main__':
main()
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