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boxlite 0.9.5: allow_net=false crashes sandbox start (network is now a NetworkSpec)

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Assessment

Difficulty
2/5
Estimated time
1-3 hours
Newbie friendliness
88/100
Issue type
Bug
Clarity
Clearly specified
Activity status
Active
Tech stack
python
Domain
infrastructure

Research direction

Read raven/sandbox/boxlite_executor.py, starting at BoxliteExecutor._ensure_box, and reproduce the sandbox startup with tools.sandbox.allow_net=false. Verify the boxlite 0.9.5 network configuration handles disabled networking and allowlists without the TypeError, while the default network behavior still works.

Written by the indexing model from the issue text.

Description

Version: main @ e1769411, boxlite==0.9.5 (the version pinned in pyproject.toml)

What happens: with tools.sandbox.allow_net = false the sandbox never starts:

TypeError: argument 'network': 'str' object cannot be cast as 'NetworkSpec'

Why: BoxliteExecutor._ensure_box (raven/sandbox/boxlite_executor.py) still uses the boxlite 0.8.2 shape, network="none" and a separate allow_net=[...] kwarg. In 0.9.x BoxOptions.network is a boxlite.NetworkSpec(mode="enabled" | "disabled", allow_net=[...]).

Fix that works here:

if self._allow_net is False:
    extra_kwargs["network"] = boxlite.NetworkSpec(mode="disabled")
elif isinstance(self._allow_net, list):
    extra_kwargs["network"] = boxlite.NetworkSpec(mode="enabled", allow_net=self._allow_net)

Verified on macOS arm64: with mode="disabled" a TCP connect from the VM fails, and with the default (no network kwarg) it succeeds.

Dominant language
Python
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Merged PRs (30d)
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