kunit: tool: yield output from run_kernel in real time

Currently, `run_kernel()` dumps all the kernel output to a file
(.kunit/test.log) and then opens the file and yields it to callers.
This made it easier to respect the requested timeout, if any.

But it means that we can't yield the results in real time, either to the
parser or to stdout (if --raw_output is set).

This change spins up a background thread to enforce the timeout, which
allows us to yield the kernel output in real time, while also copying it
to the .kunit/test.log file.
It's also careful to ensure that the .kunit/test.log file is complete,
even in the kunit_parser throws an exception/otherwise doesn't consume
every line, see the new `finally` block and unit test.

For example:

$ ./tools/testing/kunit/kunit.py run --arch=x86_64 --raw_output
<configure + build steps>
...
<can now see output from QEMU in real time>

This does not currently have a visible effect when --raw_output is not
passed, as kunit_parser.py currently only outputs everything at the end.
But that could change, and this patch is a necessary step towards
showing parsed test results in real time.

Signed-off-by: Daniel Latypov <dlatypov@google.com>
Reviewed-by: David Gow <davidgow@google.com>
Reviewed-by: Brendan Higgins <brendanhiggins@google.com>
Signed-off-by: Shuah Khan <skhan@linuxfoundation.org>
This commit is contained in:
Daniel Latypov 2021-10-04 18:13:40 -07:00 committed by Shuah Khan
parent ff9e09a376
commit 7d7c48df81
2 changed files with 62 additions and 30 deletions

View File

@ -12,7 +12,8 @@ import subprocess
import os
import shutil
import signal
from typing import Iterator, Optional, Tuple
import threading
from typing import Iterator, List, Optional, Tuple
import kunit_config
import kunit_parser
@ -99,8 +100,8 @@ class LinuxSourceTreeOperations(object):
if stderr: # likely only due to build warnings
print(stderr.decode())
def run(self, params, timeout, build_dir, outfile) -> None:
pass
def start(self, params: List[str], build_dir: str) -> subprocess.Popen:
raise RuntimeError('not implemented!')
class LinuxSourceTreeOperationsQemu(LinuxSourceTreeOperations):
@ -119,7 +120,7 @@ class LinuxSourceTreeOperationsQemu(LinuxSourceTreeOperations):
kconfig.parse_from_string(self._kconfig)
base_kunitconfig.merge_in_entries(kconfig)
def run(self, params, timeout, build_dir, outfile):
def start(self, params: List[str], build_dir: str) -> subprocess.Popen:
kernel_path = os.path.join(build_dir, self._kernel_path)
qemu_command = ['qemu-system-' + self._qemu_arch,
'-nodefaults',
@ -130,18 +131,11 @@ class LinuxSourceTreeOperationsQemu(LinuxSourceTreeOperations):
'-nographic',
'-serial stdio'] + self._extra_qemu_params
print('Running tests with:\n$', ' '.join(qemu_command))
with open(outfile, 'w') as output:
process = subprocess.Popen(' '.join(qemu_command),
stdin=subprocess.PIPE,
stdout=output,
stderr=subprocess.STDOUT,
text=True, shell=True)
try:
process.wait(timeout=timeout)
except Exception as e:
print(e)
process.terminate()
return process
return subprocess.Popen(' '.join(qemu_command),
stdin=subprocess.PIPE,
stdout=subprocess.PIPE,
stderr=subprocess.STDOUT,
text=True, shell=True)
class LinuxSourceTreeOperationsUml(LinuxSourceTreeOperations):
"""An abstraction over command line operations performed on a source tree."""
@ -171,17 +165,14 @@ class LinuxSourceTreeOperationsUml(LinuxSourceTreeOperations):
kunit_parser.print_with_timestamp(
'Starting Kernel with all configs takes a few minutes...')
def run(self, params, timeout, build_dir, outfile):
def start(self, params: List[str], build_dir: str) -> subprocess.Popen:
"""Runs the Linux UML binary. Must be named 'linux'."""
linux_bin = get_file_path(build_dir, 'linux')
outfile = get_outfile_path(build_dir)
with open(outfile, 'w') as output:
process = subprocess.Popen([linux_bin] + params,
stdin=subprocess.PIPE,
stdout=output,
stderr=subprocess.STDOUT,
text=True)
process.wait(timeout)
return subprocess.Popen([linux_bin] + params,
stdin=subprocess.PIPE,
stdout=subprocess.PIPE,
stderr=subprocess.STDOUT,
text=True)
def get_kconfig_path(build_dir) -> str:
return get_file_path(build_dir, KCONFIG_PATH)
@ -327,12 +318,36 @@ class LinuxSourceTree(object):
args.extend(['mem=1G', 'console=tty', 'kunit_shutdown=halt'])
if filter_glob:
args.append('kunit.filter_glob='+filter_glob)
outfile = get_outfile_path(build_dir)
self._ops.run(args, timeout, build_dir, outfile)
subprocess.call(['stty', 'sane'])
with open(outfile, 'r') as file:
for line in file:
process = self._ops.start(args, build_dir)
assert process.stdout is not None # tell mypy it's set
# Enforce the timeout in a background thread.
def _wait_proc():
try:
process.wait(timeout=timeout)
except Exception as e:
print(e)
process.terminate()
process.wait()
waiter = threading.Thread(target=_wait_proc)
waiter.start()
output = open(get_outfile_path(build_dir), 'w')
try:
# Tee the output to the file and to our caller in real time.
for line in process.stdout:
output.write(line)
yield line
# This runs even if our caller doesn't consume every line.
finally:
# Flush any leftover output to the file
output.write(process.stdout.read())
output.close()
process.stdout.close()
waiter.join()
subprocess.call(['stty', 'sane'])
def signal_handler(self, sig, frame) -> None:
logging.error('Build interruption occurred. Cleaning console.')

View File

@ -14,6 +14,7 @@ import tempfile, shutil # Handling test_tmpdir
import itertools
import json
import signal
import subprocess
import os
import kunit_config
@ -293,6 +294,22 @@ class LinuxSourceTreeTest(unittest.TestCase):
with self.assertRaisesRegex(kunit_kernel.ConfigError, 'not a valid arch, options are.*x86_64'):
kunit_kernel.LinuxSourceTree('', arch='invalid')
def test_run_kernel_hits_exception(self):
def fake_start(unused_args, unused_build_dir):
return subprocess.Popen(['echo "hi\nbye"'], shell=True, text=True, stdout=subprocess.PIPE)
with tempfile.TemporaryDirectory('') as build_dir:
tree = kunit_kernel.LinuxSourceTree(build_dir, load_config=False)
mock.patch.object(tree._ops, 'start', side_effect=fake_start).start()
with self.assertRaises(ValueError):
for line in tree.run_kernel(build_dir=build_dir):
self.assertEqual(line, 'hi\n')
raise ValueError('uh oh, did not read all output')
with open(kunit_kernel.get_outfile_path(build_dir), 'rt') as outfile:
self.assertEqual(outfile.read(), 'hi\nbye\n', msg='Missing some output')
# TODO: add more test cases.