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# SPDX-License-Identifier: GPL-2.0
#
# Runs UML kernel, collects output, and handles errors.
#
# Copyright (C) 2019, Google LLC.
# Author: Felix Guo <felixguoxiuping@gmail.com>
# Author: Brendan Higgins <brendanhiggins@google.com>
import logging
import subprocess
import os
import kunit_config
KCONFIG_PATH = '.config'
kunitconfig_path = '.kunitconfig'
class ConfigError(Exception):
"""Represents an error trying to configure the Linux kernel."""
class BuildError(Exception):
"""Represents an error trying to build the Linux kernel."""
class LinuxSourceTreeOperations(object):
"""An abstraction over command line operations performed on a source tree."""
def make_mrproper(self):
try:
subprocess.check_output(['make', 'mrproper'])
except OSError as e:
raise ConfigError('Could not call make command: ' + e)
except subprocess.CalledProcessError as e:
raise ConfigError(e.output)
def make_olddefconfig(self, build_dir):
command = ['make', 'ARCH=um', 'olddefconfig']
if build_dir:
command += ['O=' + build_dir]
try:
subprocess.check_output(command)
except OSError as e:
raise ConfigError('Could not call make command: ' + e)
except subprocess.CalledProcessError as e:
raise ConfigError(e.output)
def make(self, jobs, build_dir):
command = ['make', 'ARCH=um', '--jobs=' + str(jobs)]
if build_dir:
command += ['O=' + build_dir]
try:
subprocess.check_output(command)
except OSError as e:
raise BuildError('Could not call execute make: ' + e)
except subprocess.CalledProcessError as e:
raise BuildError(e.output)
def linux_bin(self, params, timeout, build_dir):
"""Runs the Linux UML binary. Must be named 'linux'."""
linux_bin = './linux'
if build_dir:
linux_bin = os.path.join(build_dir, 'linux')
process = subprocess.Popen(
[linux_bin] + params,
stdin=subprocess.PIPE,
stdout=subprocess.PIPE,
stderr=subprocess.PIPE)
process.wait(timeout=timeout)
return process
def get_kconfig_path(build_dir):
kconfig_path = KCONFIG_PATH
if build_dir:
kconfig_path = os.path.join(build_dir, KCONFIG_PATH)
return kconfig_path
class LinuxSourceTree(object):
"""Represents a Linux kernel source tree with KUnit tests."""
def __init__(self):
self._kconfig = kunit_config.Kconfig()
self._kconfig.read_from_file(kunitconfig_path)
self._ops = LinuxSourceTreeOperations()
def clean(self):
try:
self._ops.make_mrproper()
except ConfigError as e:
logging.error(e)
return False
return True
def build_config(self, build_dir):
kconfig_path = get_kconfig_path(build_dir)
if build_dir and not os.path.exists(build_dir):
os.mkdir(build_dir)
self._kconfig.write_to_file(kconfig_path)
try:
self._ops.make_olddefconfig(build_dir)
except ConfigError as e:
logging.error(e)
return False
validated_kconfig = kunit_config.Kconfig()
validated_kconfig.read_from_file(kconfig_path)
if not self._kconfig.is_subset_of(validated_kconfig):
logging.error('Provided Kconfig is not contained in validated .config!')
return False
return True
def build_reconfig(self, build_dir):
"""Creates a new .config if it is not a subset of the .kunitconfig."""
kconfig_path = get_kconfig_path(build_dir)
if os.path.exists(kconfig_path):
existing_kconfig = kunit_config.Kconfig()
existing_kconfig.read_from_file(kconfig_path)
if not self._kconfig.is_subset_of(existing_kconfig):
print('Regenerating .config ...')
os.remove(kconfig_path)
return self.build_config(build_dir)
else:
return True
else:
print('Generating .config ...')
return self.build_config(build_dir)
def build_um_kernel(self, jobs, build_dir):
try:
self._ops.make_olddefconfig(build_dir)
self._ops.make(jobs, build_dir)
except (ConfigError, BuildError) as e:
logging.error(e)
return False
used_kconfig = kunit_config.Kconfig()
used_kconfig.read_from_file(get_kconfig_path(build_dir))
if not self._kconfig.is_subset_of(used_kconfig):
logging.error('Provided Kconfig is not contained in final config!')
return False
return True
def run_kernel(self, args=[], timeout=None, build_dir=''):
args.extend(['mem=256M'])
process = self._ops.linux_bin(args, timeout, build_dir)
with open(os.path.join(build_dir, 'test.log'), 'w') as f:
for line in process.stdout:
f.write(line.rstrip().decode('ascii') + '\n')
yield line.rstrip().decode('ascii')
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