Add automatic upgrades for spn-hub

updates/restart.go

@@ -0,0 +1,48 @@
+package updates
+
+import (
+	"context"
+	"time"
+
+	"github.com/safing/portbase/log"
+	"github.com/safing/portbase/modules"
+	"github.com/tevino/abool"
+)
+
+const (
+	// RestartExitCode will instruct portmaster-start to restart the process immediately, potentially with a new version.
+	RestartExitCode = 23
+)
+
+var (
+	restartTask      *modules.Task
+	restartPending   *abool.AtomicBool
+	restartTriggered *abool.AtomicBool
+)
+
+func init() {
+	restartTask = module.NewTask("automatic restart", automaticRestart)
+}
+
+func triggerRestart(delay time.Duration) {
+	restartPending.Set()
+	restartTask.Schedule(time.Now().Add(delay))
+}
+
+// TriggerRestartIfPending triggers an automatic restart, if one is pending. This can be used to prepone a scheduled restart if the conditions are preferable.
+func TriggerRestartIfPending() {
+	if restartPending.IsSet() {
+		_ = automaticRestart(module.Ctx, nil)
+	}
+}
+
+func automaticRestart(_ context.Context, _ *modules.Task) error {
+	if restartTriggered.SetToIf(false, true) {
+		log.Info("updates: initiating automatic restart")
+		modules.SetExitStatusCode(RestartExitCode)
+		// Do not use a worker, as this would block itself here.
+		go modules.Shutdown() //nolint:errcheck
+	}
+
+	return nil
+}