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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
No known key found for this signature in database
GPG key ID: 33112E6833C34679
42 changed files with 2222 additions and 388 deletions
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18
internal/daemon/imagebuild.go
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@ -17,7 +17,7 @@ import (
"banger/internal/hostnat"
"banger/internal/model"
"banger/internal/system"
"banger/internal/vsockping"
"banger/internal/vsockagent"
)
const (
@ -104,14 +104,14 @@ func (d *Daemon) runImageBuildNative(ctx context.Context, spec imageBuildSpec) (
}
defer client.Close()
helperBytes, err := os.ReadFile(d.config.VSockPingHelperPath)
helperBytes, err := os.ReadFile(d.config.VSockAgentPath)
if err != nil {
return err
}
if err := writeBuildLog(spec.BuildLog, "installing vsock ping helper"); err != nil {
if err := writeBuildLog(spec.BuildLog, "installing vsock agent"); err != nil {
return err
}
if err := client.UploadFile(ctx, vsockping.GuestInstallPath, 0o755, helperBytes, spec.BuildLog); err != nil {
if err := client.UploadFile(ctx, vsockagent.GuestInstallPath, 0o755, helperBytes, spec.BuildLog); err != nil {
return err
}
if err := writeBuildLog(spec.BuildLog, "configuring guest"); err != nil {
@ -333,14 +333,14 @@ func appendTmuxSetup(script *bytes.Buffer) {
func appendVSockPingSetup(script *bytes.Buffer) {
script.WriteString("mkdir -p /etc/modules-load.d /etc/systemd/system\n")
script.WriteString("cat > /etc/modules-load.d/banger-vsock.conf <<'EOF'\n")
script.WriteString(vsockping.ModulesLoadConfig())
script.WriteString(vsockagent.ModulesLoadConfig())
script.WriteString("EOF\n")
script.WriteString("chmod 0644 /etc/modules-load.d/banger-vsock.conf\n")
script.WriteString("cat > /etc/systemd/system/" + vsockping.ServiceName + " <<'EOF'\n")
script.WriteString(vsockping.ServiceUnit())
script.WriteString("cat > /etc/systemd/system/" + vsockagent.ServiceName + " <<'EOF'\n")
script.WriteString(vsockagent.ServiceUnit())
script.WriteString("EOF\n")
script.WriteString("chmod 0644 /etc/systemd/system/" + vsockping.ServiceName + "\n")
script.WriteString("if command -v systemctl >/dev/null 2>&1; then systemctl daemon-reload || true; systemctl enable --now " + vsockping.ServiceName + " || true; fi\n")
script.WriteString("chmod 0644 /etc/systemd/system/" + vsockagent.ServiceName + "\n")
script.WriteString("if command -v systemctl >/dev/null 2>&1; then systemctl daemon-reload || true; systemctl enable --now " + vsockagent.ServiceName + " || true; fi\n")
}
func appendGitRepo(script *bytes.Buffer, dir, repo string) {