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## What
Adds `build/` — a Dockerfile with `mesa-build`, `nestri-build`,
`os-base`, `runtime`, `runtime_prod` and `runtime_debug` stages, plus
the `etc/` overlay, `mkimage.sh` and a `Makefile` — laid out the way
[borealis](https://chromium.googlesource.com/chromiumos/overlays/board-overlays/+/main/project-borealis)
lays out its own `build/`. This moves the guest rootfs formula into this
repo, targeting the four open guest components already here: `nescope`,
`neshub`, `neswire`, `nescapture`.
## Two structural properties worth calling out
- **No privileged host chroot.** A bare `chroot` into a hand-extracted
rootfs needs `/proc`, `/sys`, `/dev` bind-mounted in first. `os-base`
here is `FROM artixlinux/artixlinux:base-openrc` directly with `pacman
-S` as plain `RUN` steps — a Docker build step already has its own
`/proc`/`/sys`/`/dev`.
- **No host-side ownership bug to guard against.** `COPY --from=` runs
as root inside the build with no invoking-user uid in the loop.
## Scope boundary
**Deliberately excludes Proton and Valve's `steamclient.so`** — both
closed, and `CLAUDE.md` forbids closed content in this repo.
`runtime_prod`, tagged `nestrilabs/nestri:base`, is a complete,
bootable, Steam-less image — and also the shared foundation other builds
start from. Whatever layers Proton/Steam on top of it is a closed build
outside this repo, by design.
## Known gap
Nothing starts a payload yet — `nesinit` isn't open code — so
`/etc/init.d/nescope` boots it in plain-compositor mode (no command
after `--`) rather than running a game. Real and testable, just not a
full session yet. Details in `build/README.md`.
## Status
Built and tagged locally as `nestrilabs/nestri:base` (podman, no
`--no-cache` issues, greptile's three findings all fixed and verified
against a real build). Not yet packed into a disk image or run inside
nesbox.
🤖 Generated with [Claude Code](https://claude.com/claude-code)
<!-- greptile_comment -->
<h3>Greptile Summary</h3>
The PR adds a multi-stage Artix/OpenRC guest-rootfs build for the open
Nestri components, with production and debug image flavors.
- Builds patched Mesa and the Rust workspace in dedicated builder
stages.
- Assembles and configures the bootable guest environment and OpenRC
services.
- Packs a selected container image into an ext4 root filesystem while
retaining rootless container storage access.
<h3>Confidence Score: 5/5</h3>
The PR appears safe to merge.
No blocking failure remains.
<h3>Important Files Changed</h3>
| Filename | Overview |
|----------|----------|
| build/Dockerfile | Defines the complete multi-stage build, overlays
repository-root-relative configuration paths, and creates production and
debug runtime targets. |
| build/Makefile | Provides consistent image build and packing targets
using a repository-root context and matching image tags. |
| build/scripts/mkimage.sh | Keeps container-runtime operations in the
invoking user's storage while escalating only filesystem creation and
mounting operations. |
| build/etc/conf.d/nestri-user-env | Supplies the shared service
environment and export function required by the OpenRC service scripts.
|
| build/etc/init.d/guest-net | Configures optional guest networking from
kernel parameters or stable defaults. |
| build/etc/init.d/neswire | Starts the audio sink after its
dependencies and pins it as the PipeWire default once the graph is
ready. |
<h3>Flowchart</h3>
```mermaid
%%{init: {'theme': 'neutral'}}%%
flowchart TD
A[Arch builder] --> B[Mesa build]
A --> C[Nestri workspace build]
D[Artix OpenRC base] --> E[Common runtime]
B --> E
C --> E
F[build/etc overlay] --> E
E --> G[runtime_prod]
E --> H[runtime_debug]
G --> I[Container image]
H --> J[Debug container image]
I --> K[mkimage.sh]
J --> K
K --> L[ext4 rootfs]
```
<sub>Reviews (6): Last reviewed commit: ["refactor(build): rename the
published
im..."](6fecc8cc31)
| [Re-trigger
Greptile](https://app.greptile.com/api/retrigger?id=58981739)</sub>
<!-- /greptile_comment -->
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# Nestri rootfs OpenRC config
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rc_parallel="YES"
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rc_depend_strict="NO"
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rc_interactive="NO"
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rc_shell_timeout="0"
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# Every service's start/fail line, on the host directory that outlives the VM.
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#
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# Without this a guest nobody can log into reports nothing about its own boot:
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# a service that was skipped because a dependency failed looks exactly like a
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# service that was never registered. /nestri/logs is a virtiofs share, so the
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# record survives the guest — see the fstab entry below.
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rc_logger="YES"
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rc_log_path="/nestri/logs/rc.log"
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rc_verbose="NO"
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# cgroup v2
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rc_cgroup_mode="unified"
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# Don't bother trying to set hostname twice
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rc_hotplug="!net.*"
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# Faster sulogin behavior on emergency
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rc_shell="/bin/sh"
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# Default umask
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umask 022
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