File size: 8,407 Bytes
4732653 474686b 4732653 474686b 4732653 474686b 4732653 474686b 4732653 474686b 4732653 474686b 4732653 | 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 | import asyncio
import shutil
import subprocess
import time
from dataclasses import dataclass
from pathlib import Path
from sysadmin_env.overlayfs import OverlayFSManager
@dataclass
class CommandResult:
stdout: str = ""
stderr: str = ""
exit_code: int = -1
execution_time: float = 0.0
timed_out: bool = False
class Sandbox:
_HOST_RO_BINDS = [
"/usr/bin",
"/usr/sbin",
"/usr/lib",
"/usr/lib64",
"/usr/share",
"/bin",
"/sbin",
"/lib",
"/lib64",
"/etc/alternatives",
"/etc/ld.so.cache",
]
def __init__(
self,
lowerdir: str | Path,
*,
timeout: float = 30.0,
isolate_network: bool = True,
overlay_base_dir: str | None = None,
):
self._lowerdir = Path(lowerdir).resolve()
self._timeout = timeout
self._isolate_network = isolate_network
self._overlay = OverlayFSManager(base_dir=overlay_base_dir)
self._created = False
self._destroyed = False
@property
def is_created(self) -> bool:
return self._created
@property
def is_destroyed(self) -> bool:
return self._destroyed
@property
def overlay(self) -> OverlayFSManager:
return self._overlay
@property
def merged_root(self) -> Path:
return Path("/")
@property
def state_root(self) -> Path | None:
return self._overlay.merged
def create(self) -> None:
if self._created:
raise RuntimeError("sandbox already created")
if self._destroyed:
raise RuntimeError("sandbox has been destroyed and cannot be recreated")
print("sandbox verify bwrap start")
self._verify_bwrap_available()
print("sandbox verify bwrap complete")
print(f"sandbox create stack {self._lowerdir}")
self._overlay.create_stack(self._lowerdir)
print("sandbox overlay mount start")
try:
self._overlay.mount()
except Exception as exc:
print(f"sandbox overlay mount failed {type(exc).__name__.lower()}")
raise
print("sandbox overlay mount complete")
print("sandbox runtime layout start")
self._ensure_runtime_layout()
print("sandbox runtime layout complete")
self._created = True
print("sandbox created")
def _verify_bwrap_available(self) -> None:
bwrap_bin = shutil.which("bwrap")
if bwrap_bin is None:
raise FileNotFoundError("bwrap binary not found in path")
print(f"sandbox bwrap found {bwrap_bin}")
def _ensure_runtime_layout(self) -> None:
if self._overlay.merged is None:
raise RuntimeError("overlay stack not ready")
for relative in [
Path("bin"),
Path("sbin"),
Path("lib"),
Path("lib64"),
Path("usr"),
Path("usr/bin"),
Path("usr/sbin"),
Path("usr/lib"),
Path("usr/lib64"),
Path("usr/share"),
Path("usr/local"),
Path("usr/local/bin"),
Path("etc"),
Path("etc/alternatives"),
Path("var"),
Path("var/tmp"),
Path("tmp"),
Path("dev"),
Path("proc"),
Path("run"),
Path("root"),
Path("home"),
]:
(self._overlay.merged / relative).mkdir(parents=True, exist_ok=True)
def _build_bwrap_command(self, command: str) -> list[str]:
if self._overlay.merged is None:
raise RuntimeError("sandbox storage not ready")
merged = str(self._overlay.merged)
cmd = [
"bwrap",
"--bind",
merged,
"/",
"--proc",
"/proc",
"--dev",
"/dev",
"--tmpfs",
"/tmp",
"--unshare-pid",
"--unshare-uts",
"--unshare-cgroup-try",
"--die-with-parent",
"--hostname",
"sandbox",
"--clearenv",
"--setenv",
"PATH",
"/usr/local/bin:/usr/bin:/bin:/usr/sbin:/sbin",
"--setenv",
"HOME",
"/root",
"--setenv",
"TERM",
"xterm",
"--uid",
"0",
"--gid",
"0",
"--cap-drop",
"ALL",
]
if self._isolate_network:
cmd.append("--unshare-net")
for host_path in self._HOST_RO_BINDS:
if Path(host_path).exists():
cmd.extend(["--ro-bind", host_path, host_path])
cmd.extend([
"--chdir",
"/",
"--",
"/bin/sh",
"-c",
command,
])
return cmd
def execute(self, command: str, *, timeout: float | None = None) -> CommandResult:
if not self._created:
raise RuntimeError("sandbox not created call create first")
if self._destroyed:
raise RuntimeError("sandbox has been destroyed")
effective_timeout = timeout if timeout is not None else self._timeout
bwrap_cmd = self._build_bwrap_command(command)
result = CommandResult()
start = time.perf_counter()
try:
proc = subprocess.run(
bwrap_cmd,
capture_output=True,
text=True,
timeout=effective_timeout,
)
result.stdout = proc.stdout
result.stderr = proc.stderr
result.exit_code = proc.returncode
except subprocess.TimeoutExpired as exc:
result.stdout = exc.stdout if isinstance(exc.stdout, str) else (exc.stdout or b"").decode("utf-8", errors="replace")
result.stderr = exc.stderr if isinstance(exc.stderr, str) else (exc.stderr or b"").decode("utf-8", errors="replace")
result.exit_code = -1
result.timed_out = True
result.execution_time = time.perf_counter() - start
return result
async def execute_async(self, command: str, *, timeout: float | None = None) -> CommandResult:
if not self._created:
raise RuntimeError("sandbox not created call create first")
if self._destroyed:
raise RuntimeError("sandbox has been destroyed")
effective_timeout = timeout if timeout is not None else self._timeout
bwrap_cmd = self._build_bwrap_command(command)
result = CommandResult()
start = time.perf_counter()
try:
proc = await asyncio.create_subprocess_exec(
*bwrap_cmd,
stdout=asyncio.subprocess.PIPE,
stderr=asyncio.subprocess.PIPE,
)
try:
stdout_bytes, stderr_bytes = await asyncio.wait_for(
proc.communicate(),
timeout=effective_timeout,
)
result.stdout = stdout_bytes.decode("utf-8", errors="replace")
result.stderr = stderr_bytes.decode("utf-8", errors="replace")
result.exit_code = proc.returncode
except asyncio.TimeoutError:
proc.kill()
await proc.wait()
result.exit_code = -1
result.timed_out = True
except OSError as exc:
result.stderr = str(exc)
result.exit_code = -1
result.execution_time = time.perf_counter() - start
return result
def reset(self) -> float:
if not self._created:
raise RuntimeError("sandbox not created call create first")
if self._destroyed:
raise RuntimeError("sandbox has been destroyed")
latency = self._overlay.reset()
self._ensure_runtime_layout()
print(f"sandbox reset {latency:.1f}ms")
return latency
def destroy(self) -> None:
if self._destroyed:
return
self._overlay.cleanup()
self._created = False
self._destroyed = True
print("sandbox destroyed")
def __enter__(self):
self.create()
return self
def __exit__(self, exc_type, exc_val, exc_tb):
self.destroy()
return False
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