mirror of
https://github.com/ARM-software/devlib.git
synced 2025-01-30 17:50:46 +00:00
target: Implement target runner classes
Add support for launching emulated targets on QEMU. The base class ``TargetRunner`` has groundwork for target runners like ``QEMUTargetRunner``. ``TargetRunner`` is a contextmanager which starts runner process (e.g., QEMU), makes sure the target is accessible over SSH (if ``connect=True``), and terminates the runner process once it's done. The other newly introduced ``QEMUTargetRunner`` class: - performs sanity checks to ensure QEMU executable, kernel, and initrd images exist, - builds QEMU parameters properly, - creates ``Target`` object, - and lets ``TargetRunner`` manage the QEMU instance. Also add a new test case in ``tests/test_target.py`` to ensure devlib can run a QEMU target and execute some basic commands on it. While we are in neighborhood, fix a typo in ``Target.setup()``. Signed-off-by: Metin Kaya <metin.kaya@arm.com>
This commit is contained in:
Metin Kaya
Marc Bonnici
parent
1431bebd80
commit
228baeb317
@ -22,6 +22,8 @@ from devlib.target import (
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ChromeOsTarget,
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)
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from devlib.target_runner import QEMUTargetRunner
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from devlib.host import (
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PACKAGE_BIN_DIRECTORY,
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LocalConnection,
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@ -494,7 +494,7 @@ class Target(object):
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# Check for platform dependent setup procedures
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self.platform.setup(self)
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# Initialize modules which requires Buxybox (e.g. shutil dependent tasks)
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# Initialize modules which requires Busybox (e.g. shutil dependent tasks)
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self._update_modules('setup')
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await self.execute.asyn('mkdir -p {}'.format(quote(self._file_transfer_cache)))
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267
devlib/target_runner.py
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267
devlib/target_runner.py
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@ -0,0 +1,267 @@
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# Copyright 2024 ARM Limited
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#
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# Licensed under the Apache License, Version 2.0 (the "License");
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# you may not use this file except in compliance with the License.
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# You may obtain a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS,
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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# See the License for the specific language governing permissions and
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# limitations under the License.
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#
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"""
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Target runner and related classes are implemented here.
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"""
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import logging
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import os
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import signal
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import subprocess
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import time
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from platform import machine
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from devlib.exception import (TargetStableError, HostError)
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from devlib.target import LinuxTarget
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from devlib.utils.misc import get_subprocess, which
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from devlib.utils.ssh import SshConnection
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class TargetRunner:
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"""
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A generic class for interacting with targets runners.
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It mainly aims to provide framework support for QEMU like target runners
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(e.g., :class:`QEMUTargetRunner`).
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:param runner_cmd: The command to start runner process (e.g.,
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``qemu-system-aarch64 -kernel Image -append "console=ttyAMA0" ...``).
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:type runner_cmd: str
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:param target: Specifies type of target per :class:`Target` based classes.
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:type target: Target
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:param connect: Specifies if :class:`TargetRunner` should try to connect
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target after launching it, defaults to True.
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:type connect: bool, optional
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:param boot_timeout: Timeout for target's being ready for SSH access in
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seconds, defaults to 60.
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:type boot_timeout: int, optional
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:raises HostError: if it cannot execute runner command successfully.
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:raises TargetStableError: if Target is inaccessible.
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"""
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def __init__(self,
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runner_cmd,
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target,
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connect=True,
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boot_timeout=60):
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self.boot_timeout = boot_timeout
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self.target = target
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self.logger = logging.getLogger(self.__class__.__name__)
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self.logger.info('runner_cmd: %s', runner_cmd)
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try:
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self.runner_process = get_subprocess(list(runner_cmd.split()))
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except Exception as ex:
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raise HostError(f'Error while running "{runner_cmd}": {ex}') from ex
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if connect:
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self.wait_boot_complete()
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def __enter__(self):
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"""
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Complementary method for contextmanager.
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:return: Self object.
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:rtype: TargetRunner
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"""
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return self
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def __exit__(self, *_):
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"""
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Exit routine for contextmanager.
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Ensure :attr:`TargetRunner.runner_process` is terminated on exit.
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"""
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self.terminate()
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def wait_boot_complete(self):
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"""
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Wait for target OS to finish boot up and become accessible over SSH in at most
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:attr:`TargetRunner.boot_timeout` seconds.
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:raises TargetStableError: In case of timeout.
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"""
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start_time = time.time()
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elapsed = 0
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while self.boot_timeout >= elapsed:
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try:
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self.target.connect(timeout=self.boot_timeout - elapsed)
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self.logger.info('Target is ready.')
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return
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# pylint: disable=broad-except
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except BaseException as ex:
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self.logger.info('Cannot connect target: %s', ex)
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time.sleep(1)
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elapsed = time.time() - start_time
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self.terminate()
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raise TargetStableError(f'Target is inaccessible for {self.boot_timeout} seconds!')
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def terminate(self):
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"""
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Terminate :attr:`TargetRunner.runner_process`.
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"""
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if self.runner_process is None:
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return
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try:
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self.runner_process.stdin.close()
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self.runner_process.stdout.close()
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self.runner_process.stderr.close()
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if self.runner_process.poll() is None:
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self.logger.debug('Terminating target runner...')
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os.killpg(self.runner_process.pid, signal.SIGTERM)
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# Wait 3 seconds before killing the runner.
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self.runner_process.wait(timeout=3)
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except subprocess.TimeoutExpired:
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self.logger.info('Killing target runner...')
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os.killpg(self.runner_process.pid, signal.SIGKILL)
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class QEMUTargetRunner(TargetRunner):
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"""
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Class for interacting with QEMU runners.
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:class:`QEMUTargetRunner` is a subclass of :class:`TargetRunner` which performs necessary
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groundwork for launching a guest OS on QEMU.
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:param qemu_settings: A dictionary which has QEMU related parameters. The full list
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of QEMU parameters is below:
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* ``kernel_image``: This is the location of kernel image (e.g., ``Image``) which
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will be used as target's kernel.
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* ``arch``: Architecture type. Defaults to ``aarch64``.
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* ``cpu_types``: List of CPU ids for QEMU. The list only contains ``cortex-a72`` by
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default. This parameter is valid for Arm architectures only.
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* ``initrd_image``: This points to the location of initrd image (e.g.,
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``rootfs.cpio.xz``) which will be used as target's root filesystem if kernel
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does not include one already.
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* ``mem_size``: Size of guest memory in MiB.
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* ``num_cores``: Number of CPU cores. Guest will have ``2`` cores by default.
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* ``num_threads``: Number of CPU threads. Set to ``2`` by defaults.
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* ``cmdline``: Kernel command line parameter. It only specifies console device in
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default (i.e., ``console=ttyAMA0``) which is valid for Arm architectures.
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May be changed to ``ttyS0`` for x86 platforms.
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* ``enable_kvm``: Specifies if KVM will be used as accelerator in QEMU or not.
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Enabled by default if host architecture matches with target's for improving
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QEMU performance.
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:type qemu_settings: Dict
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:param connection_settings: the dictionary to store connection settings
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of :attr:`Target.connection_settings`, defaults to None.
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:type connection_settings: Dict, optional
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:param make_target: Lambda function for creating :class:`Target` based
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object, defaults to :func:`lambda **kwargs: LinuxTarget(**kwargs)`.
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:type make_target: func, optional
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:Variable positional arguments: Forwarded to :class:`TargetRunner`.
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:raises FileNotFoundError: if QEMU executable, kernel or initrd image cannot be found.
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"""
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def __init__(self,
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qemu_settings,
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connection_settings=None,
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# pylint: disable=unnecessary-lambda
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make_target=lambda **kwargs: LinuxTarget(**kwargs),
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**args):
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self.connection_settings = {
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'host': '127.0.0.1',
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'port': 8022,
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'username': 'root',
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'password': 'root',
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'strict_host_check': False,
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}
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if connection_settings is not None:
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self.connection_settings = self.connection_settings | connection_settings
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qemu_args = {
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'kernel_image': '',
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'arch': 'aarch64',
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'cpu_type': 'cortex-a72',
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'initrd_image': '',
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'mem_size': 512,
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'num_cores': 2,
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'num_threads': 2,
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'cmdline': 'console=ttyAMA0',
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'enable_kvm': True,
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}
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qemu_args = qemu_args | qemu_settings
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qemu_executable = f'qemu-system-{qemu_args["arch"]}'
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qemu_path = which(qemu_executable)
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if qemu_path is None:
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raise FileNotFoundError(f'Cannot find {qemu_executable} executable!')
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if not os.path.exists(qemu_args["kernel_image"]):
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raise FileNotFoundError(f'{qemu_args["kernel_image"]} does not exist!')
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# pylint: disable=consider-using-f-string
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qemu_cmd = '''\
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{} -kernel {} -append "{}" -m {} -smp cores={},threads={} -netdev user,id=net0,hostfwd=tcp::{}-:22 \
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-device virtio-net-pci,netdev=net0 --nographic\
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'''.format(
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qemu_path,
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qemu_args["kernel_image"],
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qemu_args["cmdline"],
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qemu_args["mem_size"],
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qemu_args["num_cores"],
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qemu_args["num_threads"],
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self.connection_settings["port"],
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)
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if qemu_args["initrd_image"]:
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if not os.path.exists(qemu_args["initrd_image"]):
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raise FileNotFoundError(f'{qemu_args["initrd_image"]} does not exist!')
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qemu_cmd += f' -initrd {qemu_args["initrd_image"]}'
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if qemu_args["arch"] == machine():
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if qemu_args["enable_kvm"]:
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qemu_cmd += ' --enable-kvm'
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else:
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qemu_cmd += f' -machine virt -cpu {qemu_args["cpu_type"]}'
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self.target = make_target(connect=False,
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conn_cls=SshConnection,
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connection_settings=self.connection_settings)
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super().__init__(runner_cmd=qemu_cmd,
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target=self.target,
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**args)
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@ -15,3 +15,16 @@ LocalLinuxTarget:
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connection_settings:
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unrooted: True
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QEMUTargetRunner:
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entry-0:
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qemu_settings:
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kernel_image: '/path/to/devlib/tools/buildroot/buildroot-v2023.11.1-aarch64/output/images/Image'
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entry-1:
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connection_settings:
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port : 8023
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qemu_settings:
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kernel_image: '/path/to/devlib/tools/buildroot/buildroot-v2023.11.1-x86_64/output/images/bzImage'
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arch: 'x86_64'
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cmdline: 'console=ttyS0'
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@ -20,7 +20,7 @@ import os
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from pprint import pp
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import pytest
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from devlib import AndroidTarget, LinuxTarget, LocalLinuxTarget
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from devlib import AndroidTarget, LinuxTarget, LocalLinuxTarget, QEMUTargetRunner
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from devlib.utils.android import AdbConnection
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from devlib.utils.misc import load_struct_from_yaml
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@ -44,32 +44,49 @@ def build_targets():
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connection_settings=entry['connection_settings'],
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conn_cls=lambda **kwargs: AdbConnection(adb_as_root=True, **kwargs),
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)
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targets.append(a_target)
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targets.append((a_target, None))
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if target_configs.get('LinuxTarget') is not None:
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print('> Linux targets:')
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for entry in target_configs['LinuxTarget'].values():
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pp(entry)
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l_target = LinuxTarget(connection_settings=entry['connection_settings'])
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targets.append(l_target)
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targets.append((l_target, None))
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if target_configs.get('LocalLinuxTarget') is not None:
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print('> LocalLinux targets:')
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for entry in target_configs['LocalLinuxTarget'].values():
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pp(entry)
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ll_target = LocalLinuxTarget(connection_settings=entry['connection_settings'])
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targets.append(ll_target)
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targets.append((ll_target, None))
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if target_configs.get('QEMUTargetRunner') is not None:
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print('> QEMU target runners:')
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for entry in target_configs['QEMUTargetRunner'].values():
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pp(entry)
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qemu_settings = entry.get('qemu_settings') and entry['qemu_settings']
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connection_settings = entry.get(
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'connection_settings') and entry['connection_settings']
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qemu_runner = QEMUTargetRunner(
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qemu_settings=qemu_settings,
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connection_settings=connection_settings,
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)
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targets.append((qemu_runner.target, qemu_runner))
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return targets
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@pytest.mark.parametrize("target", build_targets())
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def test_read_multiline_values(target):
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@pytest.mark.parametrize("target, target_runner", build_targets())
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def test_read_multiline_values(target, target_runner):
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"""
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Test Target.read_tree_values_flat()
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:param target: Type of target per :class:`Target` based classes.
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:type target: Target
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:param target_runner: Target runner object to terminate target (if necessary).
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:type target: TargetRunner
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"""
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data = {
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@ -96,4 +113,8 @@ def test_read_multiline_values(target):
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print(f'Removing {target.working_directory}...')
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target.remove(target.working_directory)
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if target_runner is not None:
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print('Terminating target runner...')
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target_runner.terminate()
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assert {k: v.strip() for k, v in data.items()} == result
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