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Add experimental Void guest workflow and vsock agent

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Make iterating on a Firecracker-friendly Void guest practical without replacing the Debian default image path.

Add local Void rootfs build/register/verify plumbing, a language-agnostic dev package baseline, and guest SSH/work-disk hardening so new images use the runtime bundle key, keep a normal root bash environment, and repair stale nested /root layouts on restart.

Replace the guest PING/PONG responder with an HTTP /healthz agent over vsock, rename the runtime bundle and config surface from ping helper to agent while still accepting the legacy keys, and route the post-SSH reminder through the new vm.health path.

Validated with GOCACHE=/tmp/banger-gocache go test ./..., make build, bash -n customize.sh make-rootfs-void.sh, and git diff --check.
This commit is contained in:
Thales Maciel 2026-03-19 14:51:25 -03:00
parent c8d9a122f9
commit 3ed78fdcfc
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GPG key ID: 33112E6833C34679
42 changed files with 2222 additions and 388 deletions
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6
internal/daemon/preflight.go
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@ -54,7 +54,7 @@ func (d *Daemon) addBaseStartPrereqs(checks *system.Preflight, image model.Image
d.addBaseStartCommandPrereqs(checks)
checks.RequireExecutable(d.config.FirecrackerBin, "firecracker binary", hint)
checks.RequireExecutable(d.config.VSockPingHelperPath, "vsock ping helper", `run 'make build' or refresh the runtime bundle`)
checks.RequireExecutable(d.config.VSockAgentPath, "vsock agent", `run 'make build' or refresh the runtime bundle`)
checks.RequireFile(vsockHostDevicePath, "vsock host device", "load the vhost_vsock kernel module on the host")
checks.RequireFile(image.RootfsPath, "rootfs image", "select a valid image or rebuild the runtime bundle")
checks.RequireFile(image.KernelPath, "kernel image", `set "default_kernel" or refresh the runtime bundle`)
@ -79,8 +79,8 @@ func (d *Daemon) addImageBuildPrereqs(ctx context.Context, checks *system.Prefli
checks.RequireCommand(command, toolHint(command))
}
checks.RequireExecutable(d.config.FirecrackerBin, "firecracker binary", hint)
checks.RequireFile(d.config.SSHKeyPath, "ssh private key", `set "ssh_key_path" or refresh the runtime bundle`)
checks.RequireExecutable(d.config.VSockPingHelperPath, "vsock ping helper", `run 'make build' or refresh the runtime bundle`)
checks.RequireFile(d.config.SSHKeyPath, "runtime ssh private key", `refresh the runtime bundle`)
checks.RequireExecutable(d.config.VSockAgentPath, "vsock agent", `run 'make build' or refresh the runtime bundle`)
checks.RequireFile(baseRootfs, "base rootfs image", `pass --base-rootfs or set "default_base_rootfs"`)
checks.RequireFile(kernelPath, "kernel image", `pass --kernel or set "default_kernel"`)
checks.RequireFile(d.config.DefaultPackagesFile, "package manifest", `set "default_packages_file" or refresh the runtime bundle`)