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bot-bottle/tests
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feat(firecracker): add Linux microVM backend to replace smolmachines
Adds a Firecracker-based backend for Linux, providing mature KVM-based
microVM isolation to replace smolmachines/libkrun (issue #342, closes
the dead-end tracked in #332).

Architecture:
- Guest control over SSH (dropbear injected into the rootfs) on a
  point-to-point TAP link. `ssh -t` forwards SIGWINCH natively, so no
  resize bridge is needed.
- Networking: a one-time, root-provisioned pool of user-owned TAP
  devices (no shared bridge → no docker0/virbr0/cni0 collisions) plus a
  dedicated `table inet bot_bottle_fc` nftables table (independent of
  Docker/ufw/firewalld rules). `./cli.py firecracker setup` prints the
  host-appropriate config (NixOS module or sudo script).
- Rootfs: `docker export` → ext4 via `mke2fs -d` (rootless, no mount),
  cached by image digest; per-bottle SSH pubkey + IP passed via the
  kernel cmdline.
- Sidecar: reuses the Docker bundle, published on the slot's host TAP IP.
- Fail-closed isolation: TAP pool verified at preflight; the egress
  boundary is proven empirically post-boot (before the agent runs) by a
  canary probe — the VM must fail to reach the host directly, or launch
  is refused.

Linux hosts with Firecracker + KVM now default to this backend;
macOS stays on macos-container.

Not yet validated end-to-end on live hardware (requires the one-time
network pool). Unit tests + pyright pass.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01G8p32HJgPoS1hLPWubbftM
2026-07-11 10:32:55 -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.