Clear spinner after each cycle

Otherwise we can get left with a piece of the spinner if all firmware
gets updates and don't print a "kept" value.

While here, replace \010 with the ksh supported \b, as suggested by cheloha@

Noticed by deraadt@

diff --git a/usr.sbin/fw_update/fw_update.sh b/usr.sbin/fw_update/fw_update.sh
index 4be63c8..912f86a 100644 (file)
--- a/usr.sbin/fw_update/fw_update.sh
+++ b/usr.sbin/fw_update/fw_update.sh
@@ -1,5 +1,5 @@
 #!/bin/ksh
-#      $OpenBSD: fw_update.sh,v 1.55 2023/11/15 02:07:43 afresh1 Exp $
+#      $OpenBSD: fw_update.sh,v 1.56 2024/03/21 01:02:29 afresh1 Exp $
 #
 # Copyright (c) 2021,2023 Andrew Hewus Fresh <afresh1@openbsd.org>
 #
@@ -100,9 +100,10 @@ spin() {
 
        {
                for p in '/' '-' '\\' '|' '/' '-' '\\' '|'; do
-                       echo -n "$p"'\010'
+                       echo -n "$p"'\b'
                        sleep 0.125
                done
+               echo -n " "'\b' 
        }>/dev/tty
 }