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Add vsock-backed SSH session reminders

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Remind users when a VM is still running after 	hanger vm ssh exits instead of silently dropping them back to the host shell.\n\nAttach a Firecracker vsock device to each VM, persist the host vsock path/CID,\nadd a new guest-side banger-vsock-pingd responder to the runtime bundle and both\nimage-build paths, and expose a vm.ping RPC that the CLI and TUI call after SSH\nreturns. Doctor and start/build preflight now validate the helper plus\n/dev/vhost-vsock so the feature fails early and clearly.\n\nValidated with go mod tidy, bash -n customize.sh, git diff --check, make build,\nand GOCACHE=/tmp/banger-gocache go test ./... outside the sandbox because the\ndaemon tests need real Unix/UDP sockets. Rebuild the image/rootfs used for new\nVMs so the guest ping service is present.
This commit is contained in:
Thales Maciel 2026-03-18 20:14:51 -03:00
parent 4930d82cb9
commit 08ef706e3f
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GPG key ID: 33112E6833C34679
31 changed files with 912 additions and 75 deletions
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9
internal/daemon/doctor.go
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@ -33,6 +33,7 @@ func (d *Daemon) doctorReport(ctx context.Context) system.Report {
report.AddPreflight("runtime bundle", d.runtimeBundleChecks(), runtimeBundleStatus(d.config))
report.AddPreflight("core vm lifecycle", d.coreVMLifecycleChecks(), "required host tools available")
report.AddPreflight("vsock ssh reminder", d.vsockChecks(), "vsock reminder prerequisites available")
d.addCapabilityDoctorChecks(ctx, &report)
report.AddPreflight("image build", d.imageBuildChecks(ctx), "image build prerequisites available")
@ -44,6 +45,7 @@ func (d *Daemon) runtimeBundleChecks() *system.Preflight {
hint := paths.RuntimeBundleHint()
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.DefaultRootfs, "default rootfs image", `set "default_rootfs" or refresh the runtime bundle`)
checks.RequireFile(d.config.DefaultKernel, "kernel image", `set "default_kernel" or refresh the runtime bundle`)
if strings.TrimSpace(d.config.DefaultInitrd) != "" {
@ -75,6 +77,13 @@ func (d *Daemon) imageBuildChecks(ctx context.Context) *system.Preflight {
return checks
}
func (d *Daemon) vsockChecks() *system.Preflight {
checks := system.NewPreflight()
checks.RequireExecutable(d.config.VSockPingHelperPath, "vsock ping helper", `run 'make build' or refresh the runtime bundle`)
checks.RequireFile(vsockHostDevicePath, "vsock host device", "load the vhost_vsock kernel module on the host")
return checks
}
func runtimeBundleStatus(cfg model.DaemonConfig) string {
if strings.TrimSpace(cfg.RuntimeDir) == "" {
return "runtime dir not configured"