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Marco Allegretti
2ae05312dc
- Replace Mesa-libEGL-devel and Mesa-libGLES-devel (do not exist on openSUSE) with libglvnd-devel (Khronos EGL/GLES dispatch headers) - Replace libseat-devel (does not exist on openSUSE) with seatd-devel Package names confirmed via rpmfind.net against Tumbleweed and Leap repositories.
100 lines
4.7 KiB
Markdown
100 lines
4.7 KiB
Markdown
# WEFT OS
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WEFT OS is a Wayland compositor and application runtime where every app is a WebAssembly component rendered in an isolated Servo WebView. No capability is granted by default; all resource access is declared in a per-app manifest and enforced at runtime.
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## What is implemented
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**Compositor** — `weft-compositor` is a Smithay-based Wayland compositor with DRM/KMS and winit backends. It implements the `zweft-shell-unstable-v1` protocol extension, which typed shell slots (panel, application) register against.
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**System shell** — `weft-servo-shell` embeds Servo (feature-gated, `--features servo-embed`) and renders `system-ui.html` as a Wayland panel. Without `servo-embed`, the binary builds as a no-op stub. Navigation gestures from the compositor are forwarded to `weft-appd` over WebSocket.
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**App shell** — `weft-app-shell` is a per-process Servo host for application WebViews. It resolves `weft-app://<id>/ui/index.html`, injects a `weftIpc` WebSocket bridge into the page, and registers with the compositor as an application surface. Also feature-gated behind `servo-embed`.
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**App daemon** — `weft-appd` supervises sessions: spawns `weft-runtime`, waits for READY, spawns `weft-app-shell`, manages the per-session IPC relay between the Wasm component and the WebView, and handles session teardown. Wraps processes in systemd scopes (`CPUQuota=200%`, `MemoryMax=512M`) when available.
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**Runtime** — `weft-runtime` runs WASI Component Model binaries under Wasmtime 30 (`--features wasmtime-runtime`). Provides `weft:app/notify`, `weft:app/ipc`, `weft:app/fetch`, `weft:app/notifications`, and `weft:app/clipboard` host imports. Preopens filesystem paths according to declared capabilities.
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**Package management** — `weft-pack` handles check, sign, verify, install, uninstall, list, build-image (EROFS dm-verity), and info. Validates capability strings at check time.
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**File portal** — `weft-file-portal` is a per-session file proxy with a path allowlist and `..` blocking.
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**Mount helper** — `weft-mount-helper` is a setuid helper for EROFS dm-verity mount/umount via `veritysetup`.
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**Demo apps** — `examples/org.weft.demo.counter` and `examples/org.weft.demo.notes` are pre-built Wasm Component binaries (`wasm32-wasip2`, wit-bindgen 0.53) with HTML UIs, signed with a committed demo keypair.
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## Repository layout
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```
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crates/ Rust workspace members
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examples/ Demo app packages (wasm32-wasip2, not workspace members)
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keys/ Demo Ed25519 keypair
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protocol/ zweft-shell-unstable-v1 Wayland protocol XML
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infra/
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nixos/ NixOS VM configuration and package derivations
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scripts/ check.ps1, check.sh
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shell/ system-ui.html, weft-ui-kit.js
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systemd/ service unit files
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vm/ build.sh, run.sh (QEMU)
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docs/
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architecture.md Component map, IPC, capability table, env vars
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security.md Capability model, process isolation, SpiderMonkey security boundary
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building.md Build instructions for all targets
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```
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## Building
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Linux system packages required (openSUSE):
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```sh
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sudo zypper install -y \
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libwayland-devel libxkbcommon-devel libglvnd-devel \
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libgbm-devel libdrm-devel libinput-devel seatd-devel libudev-devel \
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systemd-devel pkg-config clang cmake python3
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```
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Build non-Servo crates:
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```sh
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cargo build --workspace --exclude weft-servo-shell --exclude weft-app-shell
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```
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Build Linux-only crates (no Servo):
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```sh
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cargo build -p weft-compositor -p weft-servo-shell -p weft-app-shell
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```
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Build with Servo embedding (30–60 min, requires clang + python3):
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```sh
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cargo build -p weft-servo-shell --features servo-embed
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cargo build -p weft-app-shell --features servo-embed
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```
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See `docs/building.md` for full instructions including Wasm component builds, NixOS VM, and signing.
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## CI
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Three jobs on every push and pull request:
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- `cross-platform` — fmt, clippy, tests on Ubuntu and Windows
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- `linux-only` — clippy and tests for compositor and shell crates
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- `servo-embed-linux` — `cargo check --features servo-embed` for both servo crates
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## Security
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See `docs/security.md`. Key points:
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- Capabilities declared in `wapp.toml`, validated at install, enforced at runtime
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- Per-app OS processes with systemd cgroup limits
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- WASI filesystem isolation via preopened directories
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- Ed25519 package signing; optional EROFS dm-verity
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- Optional seccomp BPF blocklist in `weft-runtime`
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- SpiderMonkey is not sandbox-isolated beyond process-level isolation (see `docs/security.md`)
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## Servo fork
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- Repository: `https://github.com/marcoallegretti/servo`, branch `servo-weft`
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- Base revision: `04ca254f`
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- Patches: keyboard input, backdrop-filter in stylo
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- See `crates/weft-servo-shell/SERVO_PIN.md` for Servo integration status and known limitations
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