| """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'] |
| self.identity={'engine':engine,'image_id':self.image,'repo_digests':info.get('RepoDigests',[])} |
|
|
| def run(self,payload,timeout): |
| |
| |
| 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) |
|
|
