396 lines
14 KiB
Python
396 lines
14 KiB
Python
# SPDX-License-Identifier: GPL-2.0
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#
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# Runs UML kernel, collects output, and handles errors.
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#
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# Copyright (C) 2019, Google LLC.
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# Author: Felix Guo <felixguoxiuping@gmail.com>
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# Author: Brendan Higgins <brendanhiggins@google.com>
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import importlib.abc
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import importlib.util
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import logging
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import subprocess
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import os
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import shlex
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import shutil
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import signal
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import threading
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from typing import Iterator, List, Optional, Tuple
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import kunit_config
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from kunit_printer import stdout
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import qemu_config
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KCONFIG_PATH = '.config'
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KUNITCONFIG_PATH = '.kunitconfig'
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OLD_KUNITCONFIG_PATH = 'last_used_kunitconfig'
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DEFAULT_KUNITCONFIG_PATH = 'tools/testing/kunit/configs/default.config'
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BROKEN_ALLCONFIG_PATH = 'tools/testing/kunit/configs/broken_on_uml.config'
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UML_KCONFIG_PATH = 'tools/testing/kunit/configs/arch_uml.config'
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OUTFILE_PATH = 'test.log'
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ABS_TOOL_PATH = os.path.abspath(os.path.dirname(__file__))
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QEMU_CONFIGS_DIR = os.path.join(ABS_TOOL_PATH, 'qemu_configs')
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class ConfigError(Exception):
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"""Represents an error trying to configure the Linux kernel."""
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class BuildError(Exception):
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"""Represents an error trying to build the Linux kernel."""
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class LinuxSourceTreeOperations:
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"""An abstraction over command line operations performed on a source tree."""
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def __init__(self, linux_arch: str, cross_compile: Optional[str]):
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self._linux_arch = linux_arch
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self._cross_compile = cross_compile
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def make_mrproper(self) -> None:
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try:
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subprocess.check_output(['make', 'mrproper'], stderr=subprocess.STDOUT)
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except OSError as e:
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raise ConfigError('Could not call make command: ' + str(e))
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except subprocess.CalledProcessError as e:
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raise ConfigError(e.output.decode())
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def make_arch_config(self, base_kunitconfig: kunit_config.Kconfig) -> kunit_config.Kconfig:
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return base_kunitconfig
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def make_allyesconfig(self, build_dir: str, make_options) -> None:
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raise ConfigError('Only the "um" arch is supported for alltests')
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def make_olddefconfig(self, build_dir: str, make_options) -> None:
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command = ['make', 'ARCH=' + self._linux_arch, 'O=' + build_dir, 'olddefconfig']
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if self._cross_compile:
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command += ['CROSS_COMPILE=' + self._cross_compile]
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if make_options:
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command.extend(make_options)
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print('Populating config with:\n$', ' '.join(command))
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try:
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subprocess.check_output(command, stderr=subprocess.STDOUT)
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except OSError as e:
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raise ConfigError('Could not call make command: ' + str(e))
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except subprocess.CalledProcessError as e:
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raise ConfigError(e.output.decode())
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def make(self, jobs, build_dir: str, make_options) -> None:
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command = ['make', 'ARCH=' + self._linux_arch, 'O=' + build_dir, '--jobs=' + str(jobs)]
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if make_options:
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command.extend(make_options)
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if self._cross_compile:
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command += ['CROSS_COMPILE=' + self._cross_compile]
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print('Building with:\n$', ' '.join(command))
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try:
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proc = subprocess.Popen(command,
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stderr=subprocess.PIPE,
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stdout=subprocess.DEVNULL)
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except OSError as e:
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raise BuildError('Could not call execute make: ' + str(e))
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except subprocess.CalledProcessError as e:
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raise BuildError(e.output)
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_, stderr = proc.communicate()
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if proc.returncode != 0:
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raise BuildError(stderr.decode())
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if stderr: # likely only due to build warnings
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print(stderr.decode())
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def start(self, params: List[str], build_dir: str) -> subprocess.Popen:
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raise RuntimeError('not implemented!')
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class LinuxSourceTreeOperationsQemu(LinuxSourceTreeOperations):
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def __init__(self, qemu_arch_params: qemu_config.QemuArchParams, cross_compile: Optional[str]):
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super().__init__(linux_arch=qemu_arch_params.linux_arch,
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cross_compile=cross_compile)
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self._kconfig = qemu_arch_params.kconfig
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self._qemu_arch = qemu_arch_params.qemu_arch
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self._kernel_path = qemu_arch_params.kernel_path
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self._kernel_command_line = qemu_arch_params.kernel_command_line + ' kunit_shutdown=reboot'
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self._extra_qemu_params = qemu_arch_params.extra_qemu_params
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def make_arch_config(self, base_kunitconfig: kunit_config.Kconfig) -> kunit_config.Kconfig:
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kconfig = kunit_config.parse_from_string(self._kconfig)
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kconfig.merge_in_entries(base_kunitconfig)
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return kconfig
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def start(self, params: List[str], build_dir: str) -> subprocess.Popen:
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kernel_path = os.path.join(build_dir, self._kernel_path)
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qemu_command = ['qemu-system-' + self._qemu_arch,
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'-nodefaults',
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'-m', '1024',
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'-kernel', kernel_path,
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'-append', ' '.join(params + [self._kernel_command_line]),
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'-no-reboot',
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'-nographic',
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'-serial', 'stdio'] + self._extra_qemu_params
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# Note: shlex.join() does what we want, but requires python 3.8+.
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print('Running tests with:\n$', ' '.join(shlex.quote(arg) for arg in qemu_command))
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return subprocess.Popen(qemu_command,
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stdin=subprocess.PIPE,
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stdout=subprocess.PIPE,
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stderr=subprocess.STDOUT,
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text=True, errors='backslashreplace')
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class LinuxSourceTreeOperationsUml(LinuxSourceTreeOperations):
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"""An abstraction over command line operations performed on a source tree."""
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def __init__(self, cross_compile=None):
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super().__init__(linux_arch='um', cross_compile=cross_compile)
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def make_arch_config(self, base_kunitconfig: kunit_config.Kconfig) -> kunit_config.Kconfig:
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kconfig = kunit_config.parse_file(UML_KCONFIG_PATH)
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kconfig.merge_in_entries(base_kunitconfig)
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return kconfig
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def make_allyesconfig(self, build_dir: str, make_options) -> None:
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stdout.print_with_timestamp(
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'Enabling all CONFIGs for UML...')
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command = ['make', 'ARCH=um', 'O=' + build_dir, 'allyesconfig']
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if make_options:
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command.extend(make_options)
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process = subprocess.Popen(
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command,
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stdout=subprocess.DEVNULL,
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stderr=subprocess.STDOUT)
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process.wait()
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stdout.print_with_timestamp(
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'Disabling broken configs to run KUnit tests...')
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with open(get_kconfig_path(build_dir), 'a') as config:
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with open(BROKEN_ALLCONFIG_PATH, 'r') as disable:
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config.write(disable.read())
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stdout.print_with_timestamp(
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'Starting Kernel with all configs takes a few minutes...')
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def start(self, params: List[str], build_dir: str) -> subprocess.Popen:
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"""Runs the Linux UML binary. Must be named 'linux'."""
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linux_bin = os.path.join(build_dir, 'linux')
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params.extend(['mem=1G', 'console=tty', 'kunit_shutdown=halt'])
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return subprocess.Popen([linux_bin] + params,
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stdin=subprocess.PIPE,
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stdout=subprocess.PIPE,
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stderr=subprocess.STDOUT,
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text=True, errors='backslashreplace')
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def get_kconfig_path(build_dir: str) -> str:
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return os.path.join(build_dir, KCONFIG_PATH)
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def get_kunitconfig_path(build_dir: str) -> str:
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return os.path.join(build_dir, KUNITCONFIG_PATH)
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def get_old_kunitconfig_path(build_dir: str) -> str:
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return os.path.join(build_dir, OLD_KUNITCONFIG_PATH)
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def get_parsed_kunitconfig(build_dir: str,
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kunitconfig_paths: Optional[List[str]]=None) -> kunit_config.Kconfig:
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if not kunitconfig_paths:
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path = get_kunitconfig_path(build_dir)
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if not os.path.exists(path):
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shutil.copyfile(DEFAULT_KUNITCONFIG_PATH, path)
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return kunit_config.parse_file(path)
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merged = kunit_config.Kconfig()
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for path in kunitconfig_paths:
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if os.path.isdir(path):
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path = os.path.join(path, KUNITCONFIG_PATH)
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if not os.path.exists(path):
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raise ConfigError(f'Specified kunitconfig ({path}) does not exist')
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partial = kunit_config.parse_file(path)
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diff = merged.conflicting_options(partial)
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if diff:
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diff_str = '\n\n'.join(f'{a}\n vs from {path}\n{b}' for a, b in diff)
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raise ConfigError(f'Multiple values specified for {len(diff)} options in kunitconfig:\n{diff_str}')
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merged.merge_in_entries(partial)
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return merged
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def get_outfile_path(build_dir: str) -> str:
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return os.path.join(build_dir, OUTFILE_PATH)
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def _default_qemu_config_path(arch: str) -> str:
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config_path = os.path.join(QEMU_CONFIGS_DIR, arch + '.py')
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if os.path.isfile(config_path):
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return config_path
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options = [f[:-3] for f in os.listdir(QEMU_CONFIGS_DIR) if f.endswith('.py')]
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raise ConfigError(arch + ' is not a valid arch, options are ' + str(sorted(options)))
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def _get_qemu_ops(config_path: str,
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extra_qemu_args: Optional[List[str]],
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cross_compile: Optional[str]) -> Tuple[str, LinuxSourceTreeOperations]:
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# The module name/path has very little to do with where the actual file
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# exists (I learned this through experimentation and could not find it
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# anywhere in the Python documentation).
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#
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# Bascially, we completely ignore the actual file location of the config
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# we are loading and just tell Python that the module lives in the
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# QEMU_CONFIGS_DIR for import purposes regardless of where it actually
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# exists as a file.
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module_path = '.' + os.path.join(os.path.basename(QEMU_CONFIGS_DIR), os.path.basename(config_path))
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spec = importlib.util.spec_from_file_location(module_path, config_path)
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assert spec is not None
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config = importlib.util.module_from_spec(spec)
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# See https://github.com/python/typeshed/pull/2626 for context.
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assert isinstance(spec.loader, importlib.abc.Loader)
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spec.loader.exec_module(config)
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if not hasattr(config, 'QEMU_ARCH'):
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raise ValueError('qemu_config module missing "QEMU_ARCH": ' + config_path)
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params: qemu_config.QemuArchParams = config.QEMU_ARCH # type: ignore
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if extra_qemu_args:
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params.extra_qemu_params.extend(extra_qemu_args)
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return params.linux_arch, LinuxSourceTreeOperationsQemu(
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params, cross_compile=cross_compile)
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class LinuxSourceTree:
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"""Represents a Linux kernel source tree with KUnit tests."""
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def __init__(
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self,
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build_dir: str,
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kunitconfig_paths: Optional[List[str]]=None,
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kconfig_add: Optional[List[str]]=None,
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arch=None,
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cross_compile=None,
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qemu_config_path=None,
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extra_qemu_args=None) -> None:
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signal.signal(signal.SIGINT, self.signal_handler)
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if qemu_config_path:
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self._arch, self._ops = _get_qemu_ops(qemu_config_path, extra_qemu_args, cross_compile)
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else:
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self._arch = 'um' if arch is None else arch
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if self._arch == 'um':
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self._ops = LinuxSourceTreeOperationsUml(cross_compile=cross_compile)
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else:
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qemu_config_path = _default_qemu_config_path(self._arch)
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_, self._ops = _get_qemu_ops(qemu_config_path, extra_qemu_args, cross_compile)
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self._kconfig = get_parsed_kunitconfig(build_dir, kunitconfig_paths)
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if kconfig_add:
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kconfig = kunit_config.parse_from_string('\n'.join(kconfig_add))
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self._kconfig.merge_in_entries(kconfig)
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def arch(self) -> str:
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return self._arch
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def clean(self) -> bool:
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try:
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self._ops.make_mrproper()
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except ConfigError as e:
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logging.error(e)
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return False
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return True
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def validate_config(self, build_dir: str) -> bool:
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kconfig_path = get_kconfig_path(build_dir)
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validated_kconfig = kunit_config.parse_file(kconfig_path)
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if self._kconfig.is_subset_of(validated_kconfig):
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return True
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missing = set(self._kconfig.as_entries()) - set(validated_kconfig.as_entries())
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message = 'Not all Kconfig options selected in kunitconfig were in the generated .config.\n' \
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'This is probably due to unsatisfied dependencies.\n' \
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'Missing: ' + ', '.join(str(e) for e in missing)
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if self._arch == 'um':
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message += '\nNote: many Kconfig options aren\'t available on UML. You can try running ' \
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'on a different architecture with something like "--arch=x86_64".'
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logging.error(message)
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return False
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def build_config(self, build_dir: str, make_options) -> bool:
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kconfig_path = get_kconfig_path(build_dir)
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if build_dir and not os.path.exists(build_dir):
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os.mkdir(build_dir)
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try:
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self._kconfig = self._ops.make_arch_config(self._kconfig)
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self._kconfig.write_to_file(kconfig_path)
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self._ops.make_olddefconfig(build_dir, make_options)
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except ConfigError as e:
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logging.error(e)
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return False
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if not self.validate_config(build_dir):
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return False
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old_path = get_old_kunitconfig_path(build_dir)
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if os.path.exists(old_path):
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os.remove(old_path) # write_to_file appends to the file
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self._kconfig.write_to_file(old_path)
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return True
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def _kunitconfig_changed(self, build_dir: str) -> bool:
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old_path = get_old_kunitconfig_path(build_dir)
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if not os.path.exists(old_path):
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return True
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old_kconfig = kunit_config.parse_file(old_path)
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return old_kconfig != self._kconfig
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def build_reconfig(self, build_dir: str, make_options) -> bool:
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"""Creates a new .config if it is not a subset of the .kunitconfig."""
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kconfig_path = get_kconfig_path(build_dir)
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if not os.path.exists(kconfig_path):
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print('Generating .config ...')
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return self.build_config(build_dir, make_options)
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existing_kconfig = kunit_config.parse_file(kconfig_path)
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self._kconfig = self._ops.make_arch_config(self._kconfig)
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if self._kconfig.is_subset_of(existing_kconfig) and not self._kunitconfig_changed(build_dir):
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return True
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print('Regenerating .config ...')
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os.remove(kconfig_path)
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return self.build_config(build_dir, make_options)
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def build_kernel(self, alltests, jobs, build_dir: str, make_options) -> bool:
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try:
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if alltests:
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self._ops.make_allyesconfig(build_dir, make_options)
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self._ops.make_olddefconfig(build_dir, make_options)
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self._ops.make(jobs, build_dir, make_options)
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except (ConfigError, BuildError) as e:
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logging.error(e)
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return False
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return self.validate_config(build_dir)
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def run_kernel(self, args=None, build_dir='', filter_glob='', timeout=None) -> Iterator[str]:
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if not args:
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args = []
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if filter_glob:
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args.append('kunit.filter_glob='+filter_glob)
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process = self._ops.start(args, build_dir)
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assert process.stdout is not None # tell mypy it's set
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# Enforce the timeout in a background thread.
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def _wait_proc():
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try:
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process.wait(timeout=timeout)
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except Exception as e:
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print(e)
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process.terminate()
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process.wait()
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waiter = threading.Thread(target=_wait_proc)
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waiter.start()
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output = open(get_outfile_path(build_dir), 'w')
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try:
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# Tee the output to the file and to our caller in real time.
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for line in process.stdout:
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output.write(line)
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yield line
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# This runs even if our caller doesn't consume every line.
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finally:
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# Flush any leftover output to the file
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output.write(process.stdout.read())
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output.close()
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process.stdout.close()
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waiter.join()
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subprocess.call(['stty', 'sane'])
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def signal_handler(self, unused_sig, unused_frame) -> None:
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logging.error('Build interruption occurred. Cleaning console.')
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subprocess.call(['stty', 'sane'])
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