daemon: Dump systemctl status rpm-ostreed on load failure

This is yet another patch which should help debugging
https://bugzilla.redhat.com/show_bug.cgi?id=1958812
like situations in the future.

I also have coreos/rpm-ostree#2932
cooking but it's going to take a while to cycle down.

Author: cgwalters

pkg/daemon/daemon.go

@@ -214,6 +214,12 @@ func New(
 	if hostos.IsCoreOSVariant() {
 		osImageURL, osVersion, err = nodeUpdaterClient.GetBootedOSImageURL()
 		if err != nil {
+			// If this fails for some reason, let's dump the unit status
+			// into our logs to aid future debugging.
+			cmd := exec.Command("systemctl", "status", "rpm-ostreed")
+			cmd.Stdout = os.Stdout
+			cmd.Stderr = os.Stderr
+			_ = cmd.Run()
 			return nil, fmt.Errorf("error reading osImageURL from rpm-ostree: %v", err)
 		}
 		glog.Infof("Booted osImageURL: %s (%s)", osImageURL, osVersion)