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feat(macos): run containers inside a bottle via guest-local podman
Adds the `nested_containers` bottle flag. On the macOS backend it starts
a rootless podman service inside the bottle and exposes its
Docker-compatible API socket, so the agent still runs `docker` and
`docker compose`. No host daemon socket is mounted and the guest gains
no capabilities; backends that cannot run a guest-local engine reject
the flag in the shared prepare template rather than ignoring it.

Podman rather than rootless Docker because Apple Container's capability
bounding set omits CAP_SYS_ADMIN, which the kernel requires to write a
multi-range uid_map via newuidmap. With no subordinate UID range podman
falls back to a single-UID self-mapping an unprivileged process may
write itself, so the image build strips /etc/subuid and /etc/subgid
entries rather than adding them.

That mapping is also why nested containers are not an isolation layer:
root inside one is the agent user outside it. They are a build/test
convenience; the bottle remains the boundary.

Ports the spike branch onto main, renaming docker_access — it implied
Docker and granted access to nothing on the host — and drops podman
from the derived layer now that every built-in image ships it (#451).

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
2026-07-21 15:39:11 -04:00
..

Docs

How this project records what it builds and why — and a guide to picking the right document for what you're capturing.

When to write which document

Artifact For
PRD (docs/prds/) A feature: what to build, scope, success criteria.
Research note (docs/research/) A landscape/tradeoff investigation.
Decision record (docs/decisions/) A decision that isn't itself a feature — a policy, a convention, a "we will / won't do this," or a load-bearing choice made inside a larger PRD that deserves to be discoverable on its own.

A decision that's fully specified by a PRD doesn't need duplicating in a decision record. Write one when the decision would otherwise be buried in prose, lost in an issue thread, or have no in-repo home at all (small requests that don't merit a PRD; non-feature choices like merge strategy or a trust posture).