Add a check for livemedia when running upgrade

Signed-off-by: Itxaka <itxaka@kairos.io>

main.go

@@ -150,6 +150,9 @@ See https://kairos.io/docs/upgrade/manual/ for documentation.
 			if err := validateSource(c.String("source")); err != nil {
 				return err
 			}
+			if bootFromLiveMedia() {
+				return fmt.Errorf("cannot upgrade from live media")
+			}
 
 			return checkRoot()
 		},
@@ -836,6 +839,20 @@ func validateSource(source string) error {
 	return nil
 }
 
+// Check
+func bootFromLiveMedia() bool {
+	// Check if the system is booted from a LIVE media by checking if the file /run/cos/livecd is present
+	r, err := state.NewRuntime()
+	if err != nil {
+		return false
+	}
+	if r.BootState == state.LiveCD {
+		return true
+	}
+
+	return false
+}
+
 func getReleasesFromProvider(includePrereleases bool) ([]string, error) {
 	var tags []string
 	bus.Manager.Response(events.EventAvailableReleases, func(p *pluggable.Plugin, r *pluggable.EventResponse) {