1# TestEnv class to manage test environment variables. 2# 3# Copyright (c) 2020-2021 Virtuozzo International GmbH 4# 5# This program is free software; you can redistribute it and/or modify 6# it under the terms of the GNU General Public License as published by 7# the Free Software Foundation; either version 2 of the License, or 8# (at your option) any later version. 9# 10# This program is distributed in the hope that it will be useful, 11# but WITHOUT ANY WARRANTY; without even the implied warranty of 12# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 13# GNU General Public License for more details. 14# 15# You should have received a copy of the GNU General Public License 16# along with this program. If not, see <http://www.gnu.org/licenses/>. 17# 18 19import os 20import sys 21import tempfile 22from pathlib import Path 23import shutil 24import collections 25import random 26import subprocess 27import glob 28from typing import List, Dict, Any, Optional, ContextManager 29 30DEF_GDB_OPTIONS = 'localhost:12345' 31 32def isxfile(path: str) -> bool: 33 return os.path.isfile(path) and os.access(path, os.X_OK) 34 35 36def get_default_machine(qemu_prog: str) -> str: 37 outp = subprocess.run([qemu_prog, '-machine', 'help'], check=True, 38 universal_newlines=True, 39 stdout=subprocess.PIPE).stdout 40 41 machines = outp.split('\n') 42 try: 43 default_machine = next(m for m in machines if m.endswith(' (default)')) 44 except StopIteration: 45 return '' 46 default_machine = default_machine.split(' ', 1)[0] 47 48 alias_suf = ' (alias of {})'.format(default_machine) 49 alias = next((m for m in machines if m.endswith(alias_suf)), None) 50 if alias is not None: 51 default_machine = alias.split(' ', 1)[0] 52 53 return default_machine 54 55 56class TestEnv(ContextManager['TestEnv']): 57 """ 58 Manage system environment for running tests 59 60 The following variables are supported/provided. They are represented by 61 lower-cased TestEnv attributes. 62 """ 63 64 # We store environment variables as instance attributes, and there are a 65 # lot of them. Silence pylint: 66 # pylint: disable=too-many-instance-attributes 67 68 env_variables = ['PYTHONPATH', 'TEST_DIR', 'SOCK_DIR', 'SAMPLE_IMG_DIR', 69 'OUTPUT_DIR', 'PYTHON', 'QEMU_PROG', 'QEMU_IMG_PROG', 70 'QEMU_IO_PROG', 'QEMU_NBD_PROG', 'QSD_PROG', 71 'QEMU_OPTIONS', 'QEMU_IMG_OPTIONS', 72 'QEMU_IO_OPTIONS', 'QEMU_IO_OPTIONS_NO_FMT', 73 'QEMU_NBD_OPTIONS', 'IMGOPTS', 'IMGFMT', 'IMGPROTO', 74 'AIOMODE', 'CACHEMODE', 'VALGRIND_QEMU', 75 'CACHEMODE_IS_DEFAULT', 'IMGFMT_GENERIC', 'IMGOPTSSYNTAX', 76 'IMGKEYSECRET', 'QEMU_DEFAULT_MACHINE', 'MALLOC_PERTURB_', 77 'GDB_OPTIONS', 'PRINT_QEMU'] 78 79 def prepare_subprocess(self, args: List[str]) -> Dict[str, str]: 80 if self.debug: 81 args.append('-d') 82 83 with open(args[0], encoding="utf-8") as f: 84 try: 85 if f.readline().rstrip() == '#!/usr/bin/env python3': 86 args.insert(0, self.python) 87 except UnicodeDecodeError: # binary test? for future. 88 pass 89 90 os_env = os.environ.copy() 91 os_env.update(self.get_env()) 92 return os_env 93 94 def get_env(self) -> Dict[str, str]: 95 env = {} 96 for v in self.env_variables: 97 val = getattr(self, v.lower(), None) 98 if val is not None: 99 env[v] = val 100 101 return env 102 103 def init_directories(self) -> None: 104 """Init directory variables: 105 PYTHONPATH 106 TEST_DIR 107 SOCK_DIR 108 SAMPLE_IMG_DIR 109 OUTPUT_DIR 110 """ 111 112 # Path where qemu goodies live in this source tree. 113 qemu_srctree_path = Path(__file__, '../../../python').resolve() 114 115 self.pythonpath = os.pathsep.join(filter(None, ( 116 self.source_iotests, 117 str(qemu_srctree_path), 118 os.getenv('PYTHONPATH'), 119 ))) 120 121 self.test_dir = os.getenv('TEST_DIR', 122 os.path.join(os.getcwd(), 'scratch')) 123 Path(self.test_dir).mkdir(parents=True, exist_ok=True) 124 125 try: 126 self.sock_dir = os.environ['SOCK_DIR'] 127 self.tmp_sock_dir = False 128 Path(self.sock_dir).mkdir(parents=True, exist_ok=True) 129 except KeyError: 130 self.sock_dir = tempfile.mkdtemp() 131 self.tmp_sock_dir = True 132 133 self.sample_img_dir = os.getenv('SAMPLE_IMG_DIR', 134 os.path.join(self.source_iotests, 135 'sample_images')) 136 137 self.output_dir = os.getcwd() # OUTPUT_DIR 138 139 def init_binaries(self) -> None: 140 """Init binary path variables: 141 PYTHON (for bash tests) 142 QEMU_PROG, QEMU_IMG_PROG, QEMU_IO_PROG, QEMU_NBD_PROG, QSD_PROG 143 """ 144 self.python = sys.executable 145 146 def root(*names: str) -> str: 147 return os.path.join(self.build_root, *names) 148 149 arch = os.uname().machine 150 if 'ppc64' in arch: 151 arch = 'ppc64' 152 153 self.qemu_prog = os.getenv('QEMU_PROG', root(f'qemu-system-{arch}')) 154 if not os.path.exists(self.qemu_prog): 155 pattern = root('qemu-system-*') 156 try: 157 progs = sorted(glob.iglob(pattern)) 158 self.qemu_prog = next(p for p in progs if isxfile(p)) 159 except StopIteration: 160 sys.exit("Not found any Qemu executable binary by pattern " 161 f"'{pattern}'") 162 163 self.qemu_img_prog = os.getenv('QEMU_IMG_PROG', root('qemu-img')) 164 self.qemu_io_prog = os.getenv('QEMU_IO_PROG', root('qemu-io')) 165 self.qemu_nbd_prog = os.getenv('QEMU_NBD_PROG', root('qemu-nbd')) 166 self.qsd_prog = os.getenv('QSD_PROG', root('storage-daemon', 167 'qemu-storage-daemon')) 168 169 for b in [self.qemu_img_prog, self.qemu_io_prog, self.qemu_nbd_prog, 170 self.qemu_prog, self.qsd_prog]: 171 if not os.path.exists(b): 172 sys.exit('No such file: ' + b) 173 if not isxfile(b): 174 sys.exit('Not executable: ' + b) 175 176 def __init__(self, imgfmt: str, imgproto: str, aiomode: str, 177 cachemode: Optional[str] = None, 178 imgopts: Optional[str] = None, 179 misalign: bool = False, 180 debug: bool = False, 181 valgrind: bool = False, 182 gdb: bool = False, 183 qprint: bool = False) -> None: 184 self.imgfmt = imgfmt 185 self.imgproto = imgproto 186 self.aiomode = aiomode 187 self.imgopts = imgopts 188 self.misalign = misalign 189 self.debug = debug 190 191 if qprint: 192 self.print_qemu = 'y' 193 194 if gdb: 195 self.gdb_options = os.getenv('GDB_OPTIONS', DEF_GDB_OPTIONS) 196 if not self.gdb_options: 197 # cover the case 'export GDB_OPTIONS=' 198 self.gdb_options = DEF_GDB_OPTIONS 199 elif 'GDB_OPTIONS' in os.environ: 200 # to not propagate it in prepare_subprocess() 201 del os.environ['GDB_OPTIONS'] 202 203 if valgrind: 204 self.valgrind_qemu = 'y' 205 206 if cachemode is None: 207 self.cachemode_is_default = 'true' 208 self.cachemode = 'writeback' 209 else: 210 self.cachemode_is_default = 'false' 211 self.cachemode = cachemode 212 213 # Initialize generic paths: build_root, build_iotests, source_iotests, 214 # which are needed to initialize some environment variables. They are 215 # used by init_*() functions as well. 216 217 if os.path.islink(sys.argv[0]): 218 # called from the build tree 219 self.source_iotests = os.path.dirname(os.readlink(sys.argv[0])) 220 self.build_iotests = os.path.dirname(os.path.abspath(sys.argv[0])) 221 else: 222 # called from the source tree 223 self.source_iotests = os.getcwd() 224 self.build_iotests = self.source_iotests 225 226 self.build_root = os.path.join(self.build_iotests, '..', '..') 227 228 self.init_directories() 229 self.init_binaries() 230 231 self.malloc_perturb_ = os.getenv('MALLOC_PERTURB_', 232 str(random.randrange(1, 255))) 233 234 # QEMU_OPTIONS 235 self.qemu_options = '-nodefaults -display none -accel qtest' 236 machine_map = ( 237 ('arm', 'virt'), 238 ('aarch64', 'virt'), 239 ('avr', 'mega2560'), 240 ('m68k', 'virt'), 241 ('rx', 'gdbsim-r5f562n8'), 242 ('tricore', 'tricore_testboard') 243 ) 244 for suffix, machine in machine_map: 245 if self.qemu_prog.endswith(f'qemu-system-{suffix}'): 246 self.qemu_options += f' -machine {machine}' 247 248 # QEMU_DEFAULT_MACHINE 249 self.qemu_default_machine = get_default_machine(self.qemu_prog) 250 251 self.qemu_img_options = os.getenv('QEMU_IMG_OPTIONS') 252 self.qemu_nbd_options = os.getenv('QEMU_NBD_OPTIONS') 253 254 is_generic = self.imgfmt not in ['bochs', 'cloop', 'dmg'] 255 self.imgfmt_generic = 'true' if is_generic else 'false' 256 257 self.qemu_io_options = f'--cache {self.cachemode} --aio {self.aiomode}' 258 if self.misalign: 259 self.qemu_io_options += ' --misalign' 260 261 self.qemu_io_options_no_fmt = self.qemu_io_options 262 263 if self.imgfmt == 'luks': 264 self.imgoptssyntax = 'true' 265 self.imgkeysecret = '123456' 266 if not self.imgopts: 267 self.imgopts = 'iter-time=10' 268 elif 'iter-time=' not in self.imgopts: 269 self.imgopts += ',iter-time=10' 270 else: 271 self.imgoptssyntax = 'false' 272 self.qemu_io_options += ' -f ' + self.imgfmt 273 274 if self.imgfmt == 'vmdk': 275 if not self.imgopts: 276 self.imgopts = 'zeroed_grain=on' 277 elif 'zeroed_grain=' not in self.imgopts: 278 self.imgopts += ',zeroed_grain=on' 279 280 def close(self) -> None: 281 if self.tmp_sock_dir: 282 shutil.rmtree(self.sock_dir) 283 284 def __enter__(self) -> 'TestEnv': 285 return self 286 287 def __exit__(self, exc_type: Any, exc_value: Any, traceback: Any) -> None: 288 self.close() 289 290 def print_env(self) -> None: 291 template = """\ 292QEMU -- "{QEMU_PROG}" {QEMU_OPTIONS} 293QEMU_IMG -- "{QEMU_IMG_PROG}" {QEMU_IMG_OPTIONS} 294QEMU_IO -- "{QEMU_IO_PROG}" {QEMU_IO_OPTIONS} 295QEMU_NBD -- "{QEMU_NBD_PROG}" {QEMU_NBD_OPTIONS} 296IMGFMT -- {IMGFMT}{imgopts} 297IMGPROTO -- {IMGPROTO} 298PLATFORM -- {platform} 299TEST_DIR -- {TEST_DIR} 300SOCK_DIR -- {SOCK_DIR} 301GDB_OPTIONS -- {GDB_OPTIONS} 302VALGRIND_QEMU -- {VALGRIND_QEMU} 303PRINT_QEMU_OUTPUT -- {PRINT_QEMU} 304""" 305 306 args = collections.defaultdict(str, self.get_env()) 307 308 if 'IMGOPTS' in args: 309 args['imgopts'] = f" ({args['IMGOPTS']})" 310 311 u = os.uname() 312 args['platform'] = f'{u.sysname}/{u.machine} {u.nodename} {u.release}' 313 314 print(template.format_map(args)) 315