didericis
c276f7b0b1
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
90 lines
2.8 KiB
Python
90 lines
2.8 KiB
Python
"""FirecrackerBottleBackend — Linux microVM implementation.
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Replaces smolmachines on Linux (issue #342): mature KVM-based
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isolation via Firecracker, SSH control over a point-to-point TAP, and a
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fail-closed nftables egress boundary. Selected by
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`BOT_BOTTLE_BACKEND=firecracker` or `--backend=firecracker`.
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"""
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from __future__ import annotations
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from contextlib import contextmanager
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from pathlib import Path
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from typing import Generator, Sequence
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from ...agent_provider import AgentProvisionPlan
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from ...egress import EgressPlan
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from ...env import ResolvedEnv
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from ...git_gate import GitGatePlan
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from ...manifest import Manifest
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from ...supervise import SupervisePlan
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from .. import ActiveAgent, BottleBackend, BottleSpec
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from . import cleanup as _cleanup
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from . import enumerate as _enumerate
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from . import launch as _launch
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from . import resolve_plan as _resolve_plan
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from . import util as _util
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from .bottle import FirecrackerBottle
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from .bottle_cleanup_plan import FirecrackerBottleCleanupPlan
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from .bottle_plan import FirecrackerBottlePlan
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class FirecrackerBottleBackend(
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BottleBackend["FirecrackerBottlePlan", "FirecrackerBottleCleanupPlan"]
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):
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name = "firecracker"
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@classmethod
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def is_available(cls) -> bool:
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return _util.is_available()
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def _preflight(self) -> None:
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_resolve_plan.preflight()
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def _build_guest_env(self, resolved_env: ResolvedEnv) -> dict[str, str]:
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return _resolve_plan.build_guest_env(resolved_env)
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def _resolve_plan(
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self,
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spec: BottleSpec,
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*,
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manifest: Manifest,
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slug: str,
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resolved_env: ResolvedEnv,
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agent_provision_plan: AgentProvisionPlan,
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egress_plan: EgressPlan,
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git_gate_plan: GitGatePlan,
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supervise_plan: SupervisePlan | None,
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stage_dir: Path,
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) -> FirecrackerBottlePlan:
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return _resolve_plan.resolve_plan(
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spec,
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manifest=manifest,
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slug=slug,
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resolved_env=resolved_env,
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agent_provision_plan=agent_provision_plan,
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egress_plan=egress_plan,
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supervise_plan=supervise_plan,
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git_gate_plan=git_gate_plan,
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stage_dir=stage_dir,
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)
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@contextmanager
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def launch(
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self, plan: FirecrackerBottlePlan
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) -> Generator[FirecrackerBottle, None, None]:
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with _launch.launch(plan, provision=self.provision) as bottle:
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yield bottle
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def prepare_cleanup(self) -> FirecrackerBottleCleanupPlan:
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return _cleanup.prepare_cleanup()
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def cleanup(self, plan: FirecrackerBottleCleanupPlan) -> None:
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_cleanup.cleanup(plan)
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def enumerate_active(self) -> Sequence[ActiveAgent]:
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return _enumerate.enumerate_active()
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def supervise_mcp_url(self, plan: FirecrackerBottlePlan) -> str:
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return plan.agent_supervise_url
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