motd: use explicit umount/mount instead of remount #79
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The umount/mount construct is more robust when there is e.g. already a
/etc/motd
file or if there is not/etc/motd
mountpoint yet. The remount method fails in both of these cases.This two-stage approach was taken from #57. Using remount instead was one of the changes introduced in #77. It looks like neither I nor @KarlK90 tested this change on actual hardware, instead relying only on the demo_mode.