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feat(smolmachines): run backend on Linux
Port the smolmachines backend so BOT_BOTTLE_BACKEND=smolmachines
works on Linux (KVM), not just macOS:

- Preflight gates /dev/kvm presence + accessibility on Linux with
  actionable remediation (kvm module, kvm group).
- smolvm state-DB path is platform-derived (XDG on Linux).
- force_allowlist runs on both platforms and is fail-closed: it
  verifies the persisted TSI allowlist and dies rather than booting
  a VM whose egress confinement it can't confirm. Previously it
  no-oped on Linux, failing OPEN.
- allocate() does per-bottle 127.0.0.<N> scoping on Linux too (no
  ifconfig needed — all of 127/8 is already loopback); only
  ensure_pool's lo0 aliasing stays macOS-only.
- README documents Linux + NixOS host setup.

Linux/KVM integration (the sandbox-escape acceptance gate) is
pending verification on a NixOS host; unit tests cover the new
platform branches.

Issue: #283

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01NkwFXLFff9PYPy4wgVBJp9
2026-06-25 17:08:22 -04:00
..

Tests

Plain-Python test suite using stdlib unittest. No external dependencies. Unit tests run anywhere Python 3 is present; integration tests need Docker and skip cleanly otherwise.

Layout

tests/
  fixtures.py                       # JSON manifest builders (shared)
  _docker.py                        # docker-availability skip helper (shared)
  unit/
    test_egress.py
    test_egress_addon_core.py
    test_manifest_egress.py
    test_dlp_detectors.py
    test_manifest_runtime.py
    ...                             # many others; see unit/ directory
  integration/
    test_sidecar_bundle_image.py
    test_sidecar_bundle_compose.py
    test_dry_run_plan.py
    test_orphan_cleanup.py
    ...
  canaries/                         # opt-in; see below (currently empty)

Classification falls out of the directory — no hand-maintained list to keep in sync.

Running

python -m unittest discover -t . -s tests/unit -v         # unit only
python -m unittest discover -t . -s tests/integration -v  # integration only
python -m unittest discover -t . -s tests -v              # both (recursive)
python -m unittest tests.unit.test_manifest_egress        # one file

Discovery is invoked with -t . (top-level dir = repo root) so the bot_bottle package on sys.path resolves correctly.

What the integration tests cover

  • test_dry_run_plan.pycli.py start --dry-run --format=json emits a structured plan that contains the resolved egress allowlist and the bottle's runtime, and creates zero Docker resources.
  • test_orphan_cleanup.pynetwork_remove is idempotent against missing resources, so the EXIT trap can call it unconditionally.
  • test_sidecar_bundle_image.py — builds Dockerfile.sidecars and probes that gitleaks / mitmdump / supervise are all reachable inside the bundle.
  • test_sidecar_bundle_compose.py — end-to-end compose-up of an agent + bundle pair; verifies the agent reaches the bundle via the legacy network aliases.

Canaries

tests/canaries/ holds upstream-regression checks gated on BOT_BOTTLE_RUN_CANARIES=1 and not part of the per-push suite. They're invoked by the scheduled canaries workflow. Currently no canaries are defined.

BOT_BOTTLE_RUN_CANARIES=1 python -m unittest discover -t . -s tests/canaries -v

What's NOT covered

  • bot_bottle/ssh.py end-to-end (would need a fake SSH host inside the container).
  • A live SSH-through-git-gate tunnel against a real Tailscale-style IP.
  • DLP false-positive measurements.
  • TLS handling / cert pinning behavior.

Adding a test

  1. Pick the directory: tests/unit/ for a pure unit test, tests/integration/ for one that needs Docker.
  2. Filename: test_<topic>.py.
  3. Boilerplate:
    import unittest
    
    from bot_bottle.<module> import <symbol>
    
    class TestThing(unittest.TestCase):
        def test_x(self):
            ...
    
    if __name__ == "__main__":
        unittest.main()
    
  4. For Docker-dependent tests, decorate the class with @skip_unless_docker() from tests._docker.