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qemu/tests/qemu-iotests/testenv.py
Daniel P. Berrangé a9e21786da iotests: allow test discovery before building 
The 'check' script can be invoked in "dry run" mode, in which case it
merely does test discovery and prints out all their names. Despite only
doing test discovery it still validates that the various QEMU binaries
can be found. This makes it impossible todo test discovery prior to
building QEMU. This is a desirable feature to support, because it will
let meson discover tests.

Fortunately the code in the TestEnv constructor is ordered in a way
that makes this fairly trivial to achieve. We can just short circuit
the constructor after the basic directory paths have been set.

Reviewed-by: Thomas Huth <thuth@redhat.com>
Reviewed-by: Alex Bennée <alex.bennee@linaro.org>
Signed-off-by: Daniel P. Berrangé <berrange@redhat.com>
Acked-by: Hanna Czenczek <hreitz@redhat.com>
Tested-by: Thomas Huth <thuth@redhat.com>
Message-Id: <20230303160727.3977246-3-berrange@redhat.com>
Signed-off-by: Alex Bennée <alex.bennee@linaro.org>
Message-Id: <20230315174331.2959-20-alex.bennee@linaro.org>
2023-03-22 15:08:26 +00:00

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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_GDB_OPTIONS = 'localhost:12345'
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',
'PYTHON', 'QEMU_PROG', 'QEMU_IMG_PROG',
'QEMU_IO_PROG', 'QEMU_NBD_PROG', 'QSD_PROG',
'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_',
'GDB_OPTIONS', 'PRINT_QEMU']
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
"""
# Path where qemu goodies live in this source tree.
qemu_srctree_path = Path(__file__, '../../../python').resolve()
self.pythonpath = os.pathsep.join(filter(None, (
self.source_iotests,
str(qemu_srctree_path),
os.getenv('PYTHONPATH'),
)))
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.sock_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'))
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
"""
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)
def __init__(self, source_dir: str, build_dir: str,
imgfmt: str, imgproto: str, aiomode: str,
cachemode: Optional[str] = None,
imgopts: Optional[str] = None,
misalign: bool = False,
debug: bool = False,
valgrind: bool = False,
gdb: bool = False,
qprint: bool = False,
dry_run: bool = False) -> None:
self.imgfmt = imgfmt
self.imgproto = imgproto
self.aiomode = aiomode
self.imgopts = imgopts
self.misalign = misalign
self.debug = debug
if qprint:
self.print_qemu = 'y'
if gdb:
self.gdb_options = os.getenv('GDB_OPTIONS', DEF_GDB_OPTIONS)
if not self.gdb_options:
# cover the case 'export GDB_OPTIONS='
self.gdb_options = DEF_GDB_OPTIONS
elif 'GDB_OPTIONS' in os.environ:
# to not propagate it in prepare_subprocess()
del os.environ['GDB_OPTIONS']
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.
self.source_iotests = source_dir
self.build_iotests = build_dir
self.build_root = os.path.join(self.build_iotests, '..', '..')
self.init_directories()
if dry_run:
return
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'),
('riscv32', 'virt'),
('riscv64', '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, prefix: str = '') -> None:
template = """\
{prefix}QEMU -- "{QEMU_PROG}" {QEMU_OPTIONS}
{prefix}QEMU_IMG -- "{QEMU_IMG_PROG}" {QEMU_IMG_OPTIONS}
{prefix}QEMU_IO -- "{QEMU_IO_PROG}" {QEMU_IO_OPTIONS}
{prefix}QEMU_NBD -- "{QEMU_NBD_PROG}" {QEMU_NBD_OPTIONS}
{prefix}IMGFMT -- {IMGFMT}{imgopts}
{prefix}IMGPROTO -- {IMGPROTO}
{prefix}PLATFORM -- {platform}
{prefix}TEST_DIR -- {TEST_DIR}
{prefix}SOCK_DIR -- {SOCK_DIR}
{prefix}GDB_OPTIONS -- {GDB_OPTIONS}
{prefix}VALGRIND_QEMU -- {VALGRIND_QEMU}
{prefix}PRINT_QEMU_OUTPUT -- {PRINT_QEMU}
{prefix}"""
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}'
args['prefix'] = prefix
print(template.format_map(args))
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