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
48 lines
1.2 KiB
Python
48 lines
1.2 KiB
Python
"""Prepare step for the Firecracker backend."""
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from __future__ import annotations
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from pathlib import Path
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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 BottleSpec
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from . import util
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from .bottle_plan import FirecrackerBottlePlan
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def preflight() -> None:
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util.require_firecracker()
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def build_guest_env(resolved_env: ResolvedEnv) -> dict[str, str]:
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return dict(resolved_env.literals)
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def resolve_plan(
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spec: BottleSpec,
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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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supervise_plan: SupervisePlan | None,
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git_gate_plan: GitGatePlan,
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stage_dir: Path,
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) -> FirecrackerBottlePlan:
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return FirecrackerBottlePlan(
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spec=spec,
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manifest=manifest,
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stage_dir=stage_dir,
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slug=slug,
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forwarded_env=dict(resolved_env.forwarded),
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git_gate_plan=git_gate_plan,
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egress_plan=egress_plan,
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supervise_plan=supervise_plan,
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agent_provision=agent_provision_plan,
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)
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