wirenboard-agent-vm/npm-dist/agent-vm-linux-arm64/lib/.gitkeep
Evgeny Boger 0468a2649a B2: ship a native aarch64-linux release binary via npm
Why
---
PLAN.md item "B2 — Cross-arch binaries" (section B, Distribution /
release) calls for cross-arch builds and per-platform npm packaging,
noting that "the package currently bundles a linux-x86_64 binary". As a
result Apple Silicon and ARM Linux users get no native artifact and fall
back to slow x86 emulation (Rosetta / qemu) — a poor fit for a tool whose
job is to launch microVMs quickly. This change delivers the linux/aarch64
half of B2: a genuine aarch64 binary, built, packaged, and selected at
install time, so ARM hosts run native.

How
---
Release workflow (.github/workflows/release-npm.yml): every build job
(build-agent-vm, build-msb, build-libkrunfw) and the package job gain a
linux-arm64 matrix leg. Because GitHub's hosted arm64 Linux runners
aren't on the free tier, the arm64 leg cross-compiles on the x64 runner:
a `cross: true` matrix flag drives a `CROSS` env switch that (a) enables
the arm64 multiarch apt repo and installs the cross linker
(gcc-aarch64-linux-gnu) plus the :arm64 dev libs agent-vm / msb link
against (libcap-ng, libdbus, libsqlite3), and (b) exports
PKG_CONFIG_ALLOW_CROSS / PKG_CONFIG_PATH / PKG_CONFIG_SYSROOT_DIR so the
`pkg-config` crate resolves the target libs. The msb job also sets
CARGO_TARGET_AARCH64_UNKNOWN_LINUX_GNU_LINKER directly, since it builds
from vendor/microsandbox (a separate workspace not on the superproject's
.cargo config search path). All of these guards are no-ops on the native
x64 leg, so the existing x86_64 path is unchanged. The libkrunfw arm64
leg cross-builds the guest kernel with ARCH=arm64 / CROSS_COMPILE and
fails fast with a clear message if its arm64 kbuild .config seed
(libkrunfw-overrides/config-libkrunfw_aarch64.patch) hasn't been ported
yet, rather than silently shipping a mis-configured kernel. The publish
job downloads the new agent-vm-linux-arm64 artifact alongside the x64 one.

Cross toolchain config (.cargo/config.toml, new): pins the
aarch64-unknown-linux-gnu linker to aarch64-linux-gnu-gcc so a local
cross build reproduces CI; the file documents the matching apt packages.

npm launcher (npm-dist/agent-vm/bin/agent-vm.js,
npm-dist/agent-vm/package.json): un-comment the linux-arm64 entry in the
launcher's PLATFORM_PACKAGES map and add @wirenboard/agent-vm-linux-arm64
to the main package's optionalDependencies, so `npm install` pulls the
arm64 subpackage on ARM hosts and the launcher dispatches to it.

arm64 subpackage scaffold (npm-dist/agent-vm-linux-arm64/, new): mirrors
the x64 subpackage layout — package.json (os linux / cpu arm64),
README.md, and bin/.gitkeep + lib/.gitkeep placeholders — so the
directory exists in the tree for the release workflow to drop the
cross-built binary, msb, and libkrunfw into.

Dispatch test (npm-dist/agent-vm/bin/agent-vm.dispatch.test.js, new):
arm64 dispatch can't be exercised on an x86_64 CI host because node
reports the host's real process.arch. The test re-derives the launcher's
PLATFORM_PACKAGES map + bin-path logic from the source and asserts the
linux-arm64 key resolves to the arm64 subpackage with the same bin/
layout as x64, so a future edit that forgets arm64 fails here instead of
silently falling through to "no prebuilt binary" on ARM hardware.

README (npm-dist/README.md): document that the package now ships both the
linux-x64 and linux-arm64 per-platform subpackages.

macOS / darwin and win32 cross builds remain out of scope for this change
(still commented placeholders in the launcher) and are tracked under the
rest of B2.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
2026-05-31 18:57:07 +00:00

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