File size: 2,783 Bytes
d044abe bebe819 d044abe bebe819 d044abe | 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 | """Fail-closed container boundary. Candidate code never runs on the host."""
import json
import os
from pathlib import Path
import shutil
import subprocess
import tempfile
import uuid
class SandboxUnavailable(RuntimeError):pass
class Sandbox:
def __init__(self,image='smolscript-runtime:0.1.0',engine='docker'):
if not shutil.which(engine):raise SandboxUnavailable(f'{engine} is unavailable; install Docker/Podman and build sandbox/Dockerfile. No host fallback exists.')
self.engine=engine
try:
info=json.loads(subprocess.check_output([engine,'image','inspect',image],timeout=15))[0]
except (subprocess.SubprocessError,ValueError,KeyError) as e:raise SandboxUnavailable('Sandbox image unavailable; build it before offline evaluation') from e
self.image=info['Id'] # Immutable local ID, not a moving tag.
self.identity={'engine':engine,'image_id':self.image,'repo_digests':info.get('RepoDigests',[])}
def run(self,payload,timeout):
# Only candidate, fixture, input values and observation selectors cross the
# boundary. Expected answers, references, credentials and dataset do not.
name='smolscript-'+uuid.uuid4().hex
with tempfile.TemporaryDirectory(prefix='smolscript-input-') as directory:
path=Path(directory)/'request.json'
path.write_text(json.dumps(payload));path.chmod(0o444);os.chmod(directory,0o755)
command=[self.engine,'run','--rm','--name',name,'--network','none','--read-only',
'--cap-drop','ALL','--security-opt','no-new-privileges','--user','1000:1000',
'--memory','2g','--memory-swap','2g','--cpus','1','--pids-limit','512',
'--ulimit','nofile=256:256','--ulimit','core=0:0',
'--tmpfs','/work:rw,exec,nosuid,size=256m,uid=1000,gid=1000',
'--tmpfs','/tmp:rw,nosuid,size=128m,uid=1000,gid=1000','--shm-size','128m',
'--mount',f'type=bind,src={directory},dst=/input,readonly',
self.image,'python3','/opt/smolscript/supervisor.py','/input/request.json']
try:
result=subprocess.run(command,capture_output=True,text=True,timeout=timeout)
if result.returncode:raise RuntimeError('Sandbox infrastructure failed: '+result.stderr[-2000:])
value=json.loads(result.stdout)
if 'infrastructure_error' in value:raise RuntimeError(value['infrastructure_error'])
return value
except subprocess.TimeoutExpired:
raise RuntimeError('Sandbox supervisor timed out; outcome incomplete')
finally:
subprocess.run([self.engine,'rm','-f',name],stdout=subprocess.DEVNULL,stderr=subprocess.DEVNULL,timeout=15)
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