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FRET-qemu/tests/qemu-iotests/testenv.py
Paolo Bonzini 480b75ee14 qemu-iotests: let "check" spawn an arbitrary test command 
Right now there is no easy way for "check" to print a reproducer command.
Because such a reproducer command line would be huge, we can instead teach
check to start a command of our choice.  This can be for example a Python
unit test with arguments to only run a specific subtest.

Move the trailing empty line to print_env(), since it always looks better
and one caller was not adding it.

Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Reviewed-by: Vladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com>
Tested-by: Emanuele Giuseppe Esposito <eesposit@redhat.com>
Message-Id: <20210323181928.311862-5-pbonzini@redhat.com>
Message-Id: <20210503110110.476887-5-pbonzini@redhat.com>
Signed-off-by: Max Reitz <mreitz@redhat.com>
2021-05-14 16:14:10 +02:00

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# TestEnv class to manage test environment variables.
#
# Copyright (c) 2020-2021 Virtuozzo International GmbH
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 2 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program. If not, see <http://www.gnu.org/licenses/>.
#
import os
import sys
import tempfile
from pathlib import Path
import shutil
import collections
import random
import subprocess
import glob
from typing import List, Dict, Any, Optional, ContextManager
def isxfile(path: str) -> bool:
return os.path.isfile(path) and os.access(path, os.X_OK)
def get_default_machine(qemu_prog: str) -> str:
outp = subprocess.run([qemu_prog, '-machine', 'help'], check=True,
universal_newlines=True,
stdout=subprocess.PIPE).stdout
machines = outp.split('\n')
try:
default_machine = next(m for m in machines if m.endswith(' (default)'))
except StopIteration:
return ''
default_machine = default_machine.split(' ', 1)[0]
alias_suf = ' (alias of {})'.format(default_machine)
alias = next((m for m in machines if m.endswith(alias_suf)), None)
if alias is not None:
default_machine = alias.split(' ', 1)[0]
return default_machine
class TestEnv(ContextManager['TestEnv']):
"""
Manage system environment for running tests
The following variables are supported/provided. They are represented by
lower-cased TestEnv attributes.
"""
# We store environment variables as instance attributes, and there are a
# lot of them. Silence pylint:
# pylint: disable=too-many-instance-attributes
env_variables = ['PYTHONPATH', 'TEST_DIR', 'SOCK_DIR', 'SAMPLE_IMG_DIR',
'OUTPUT_DIR', 'PYTHON', 'QEMU_PROG', 'QEMU_IMG_PROG',
'QEMU_IO_PROG', 'QEMU_NBD_PROG', 'QSD_PROG',
'SOCKET_SCM_HELPER', 'QEMU_OPTIONS', 'QEMU_IMG_OPTIONS',
'QEMU_IO_OPTIONS', 'QEMU_IO_OPTIONS_NO_FMT',
'QEMU_NBD_OPTIONS', 'IMGOPTS', 'IMGFMT', 'IMGPROTO',
'AIOMODE', 'CACHEMODE', 'VALGRIND_QEMU',
'CACHEMODE_IS_DEFAULT', 'IMGFMT_GENERIC', 'IMGOPTSSYNTAX',
'IMGKEYSECRET', 'QEMU_DEFAULT_MACHINE', 'MALLOC_PERTURB_']
def prepare_subprocess(self, args: List[str]) -> Dict[str, str]:
if self.debug:
args.append('-d')
with open(args[0], encoding="utf-8") as f:
try:
if f.readline().rstrip() == '#!/usr/bin/env python3':
args.insert(0, self.python)
except UnicodeDecodeError: # binary test? for future.
pass
os_env = os.environ.copy()
os_env.update(self.get_env())
return os_env
def get_env(self) -> Dict[str, str]:
env = {}
for v in self.env_variables:
val = getattr(self, v.lower(), None)
if val is not None:
env[v] = val
return env
def init_directories(self) -> None:
"""Init directory variables:
PYTHONPATH
TEST_DIR
SOCK_DIR
SAMPLE_IMG_DIR
OUTPUT_DIR
"""
self.pythonpath = os.getenv('PYTHONPATH')
if self.pythonpath:
self.pythonpath = self.source_iotests + os.pathsep + \
self.pythonpath
else:
self.pythonpath = self.source_iotests
self.test_dir = os.getenv('TEST_DIR',
os.path.join(os.getcwd(), 'scratch'))
Path(self.test_dir).mkdir(parents=True, exist_ok=True)
try:
self.sock_dir = os.environ['SOCK_DIR']
self.tmp_sock_dir = False
Path(self.test_dir).mkdir(parents=True, exist_ok=True)
except KeyError:
self.sock_dir = tempfile.mkdtemp()
self.tmp_sock_dir = True
self.sample_img_dir = os.getenv('SAMPLE_IMG_DIR',
os.path.join(self.source_iotests,
'sample_images'))
self.output_dir = os.getcwd() # OUTPUT_DIR
def init_binaries(self) -> None:
"""Init binary path variables:
PYTHON (for bash tests)
QEMU_PROG, QEMU_IMG_PROG, QEMU_IO_PROG, QEMU_NBD_PROG, QSD_PROG
SOCKET_SCM_HELPER
"""
self.python = sys.executable
def root(*names: str) -> str:
return os.path.join(self.build_root, *names)
arch = os.uname().machine
if 'ppc64' in arch:
arch = 'ppc64'
self.qemu_prog = os.getenv('QEMU_PROG', root(f'qemu-system-{arch}'))
if not os.path.exists(self.qemu_prog):
pattern = root('qemu-system-*')
try:
progs = sorted(glob.iglob(pattern))
self.qemu_prog = next(p for p in progs if isxfile(p))
except StopIteration:
sys.exit("Not found any Qemu executable binary by pattern "
f"'{pattern}'")
self.qemu_img_prog = os.getenv('QEMU_IMG_PROG', root('qemu-img'))
self.qemu_io_prog = os.getenv('QEMU_IO_PROG', root('qemu-io'))
self.qemu_nbd_prog = os.getenv('QEMU_NBD_PROG', root('qemu-nbd'))
self.qsd_prog = os.getenv('QSD_PROG', root('storage-daemon',
'qemu-storage-daemon'))
for b in [self.qemu_img_prog, self.qemu_io_prog, self.qemu_nbd_prog,
self.qemu_prog, self.qsd_prog]:
if not os.path.exists(b):
sys.exit('No such file: ' + b)
if not isxfile(b):
sys.exit('Not executable: ' + b)
helper_path = os.path.join(self.build_iotests, 'socket_scm_helper')
if isxfile(helper_path):
self.socket_scm_helper = helper_path # SOCKET_SCM_HELPER
def __init__(self, imgfmt: str, imgproto: str, aiomode: str,
cachemode: Optional[str] = None,
imgopts: Optional[str] = None,
misalign: bool = False,
debug: bool = False,
valgrind: bool = False) -> None:
self.imgfmt = imgfmt
self.imgproto = imgproto
self.aiomode = aiomode
self.imgopts = imgopts
self.misalign = misalign
self.debug = debug
if valgrind:
self.valgrind_qemu = 'y'
if cachemode is None:
self.cachemode_is_default = 'true'
self.cachemode = 'writeback'
else:
self.cachemode_is_default = 'false'
self.cachemode = cachemode
# Initialize generic paths: build_root, build_iotests, source_iotests,
# which are needed to initialize some environment variables. They are
# used by init_*() functions as well.
if os.path.islink(sys.argv[0]):
# called from the build tree
self.source_iotests = os.path.dirname(os.readlink(sys.argv[0]))
self.build_iotests = os.path.dirname(os.path.abspath(sys.argv[0]))
else:
# called from the source tree
self.source_iotests = os.getcwd()
self.build_iotests = self.source_iotests
self.build_root = os.path.join(self.build_iotests, '..', '..')
self.init_directories()
self.init_binaries()
self.malloc_perturb_ = os.getenv('MALLOC_PERTURB_',
str(random.randrange(1, 255)))
# QEMU_OPTIONS
self.qemu_options = '-nodefaults -display none -accel qtest'
machine_map = (
('arm', 'virt'),
('aarch64', 'virt'),
('avr', 'mega2560'),
('m68k', 'virt'),
('rx', 'gdbsim-r5f562n8'),
('tricore', 'tricore_testboard')
)
for suffix, machine in machine_map:
if self.qemu_prog.endswith(f'qemu-system-{suffix}'):
self.qemu_options += f' -machine {machine}'
# QEMU_DEFAULT_MACHINE
self.qemu_default_machine = get_default_machine(self.qemu_prog)
self.qemu_img_options = os.getenv('QEMU_IMG_OPTIONS')
self.qemu_nbd_options = os.getenv('QEMU_NBD_OPTIONS')
is_generic = self.imgfmt not in ['bochs', 'cloop', 'dmg']
self.imgfmt_generic = 'true' if is_generic else 'false'
self.qemu_io_options = f'--cache {self.cachemode} --aio {self.aiomode}'
if self.misalign:
self.qemu_io_options += ' --misalign'
self.qemu_io_options_no_fmt = self.qemu_io_options
if self.imgfmt == 'luks':
self.imgoptssyntax = 'true'
self.imgkeysecret = '123456'
if not self.imgopts:
self.imgopts = 'iter-time=10'
elif 'iter-time=' not in self.imgopts:
self.imgopts += ',iter-time=10'
else:
self.imgoptssyntax = 'false'
self.qemu_io_options += ' -f ' + self.imgfmt
if self.imgfmt == 'vmdk':
if not self.imgopts:
self.imgopts = 'zeroed_grain=on'
elif 'zeroed_grain=' not in self.imgopts:
self.imgopts += ',zeroed_grain=on'
def close(self) -> None:
if self.tmp_sock_dir:
shutil.rmtree(self.sock_dir)
def __enter__(self) -> 'TestEnv':
return self
def __exit__(self, exc_type: Any, exc_value: Any, traceback: Any) -> None:
self.close()
def print_env(self) -> None:
template = """\
QEMU -- "{QEMU_PROG}" {QEMU_OPTIONS}
QEMU_IMG -- "{QEMU_IMG_PROG}" {QEMU_IMG_OPTIONS}
QEMU_IO -- "{QEMU_IO_PROG}" {QEMU_IO_OPTIONS}
QEMU_NBD -- "{QEMU_NBD_PROG}" {QEMU_NBD_OPTIONS}
IMGFMT -- {IMGFMT}{imgopts}
IMGPROTO -- {IMGPROTO}
PLATFORM -- {platform}
TEST_DIR -- {TEST_DIR}
SOCK_DIR -- {SOCK_DIR}
SOCKET_SCM_HELPER -- {SOCKET_SCM_HELPER}
"""
args = collections.defaultdict(str, self.get_env())
if 'IMGOPTS' in args:
args['imgopts'] = f" ({args['IMGOPTS']})"
u = os.uname()
args['platform'] = f'{u.sysname}/{u.machine} {u.nodename} {u.release}'
print(template.format_map(args))
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