# runtime_sources

Source-of-truth inputs for `make runtime-bundle`.

Current state:
- `build/runtime_sources/` contains the real materialized runtime inputs used to build the packaged bundle.
- the checked-in tracked files under `runtime_sources/linux-x86_64/` are build recipes and lock metadata, not the materialized binaries/images.
- `guest/pyro_guest_agent.py` is the guest agent source artifact that is installed into each built rootfs.
- real source materialization now writes into `build/runtime_sources/`, not back into the tracked placeholder files.
- the packaged runtime images under `src/pyro_mcp/runtime_bundle/` are stored via Git LFS, so contributor clones need `git lfs install` and LFS-enabled checkout.

Materialization workflow:
1. `make runtime-fetch-binaries`
2. `make runtime-build-kernel-real`
3. `make runtime-build-rootfs-real`
4. `make runtime-bundle`

Build requirements for the real path:
- `docker`
- outbound network access to GitHub and Debian snapshot mirrors
- enough disk for a kernel build plus 2G ext4 images per profile

Current status:
1. Firecracker and Jailer are materialized from pinned official release artifacts.
2. The kernel and rootfs images are built from pinned inputs into `build/runtime_sources/`.
3. The guest agent is installed into each rootfs and used for vsock exec.
4. `runtime.lock.json` now advertises real guest capabilities.

Safety rule:
- The build pipeline should never emit `vm_boot=true`, `guest_exec=true`, or `guest_network=true` while any source artifact is still a shim or placeholder.