diskimage-builder/diskimage_builder/elements/enable-serial-console/cleanup.d/99-fix-grub

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set -euxo
BOOTDIR=$TARGET_ROOT/boot
# Splashimage in grub has a known issue with serial console
# So grub config file needs to be fixed.
if [ -f $BOOTDIR/grub/grub.conf ] ; then
sed -i -e "/^splashimage/d;s/ rhgb\( \|$\)/\1/g;s/ quiet\( \|$\)/\1/g;/^serial/d;/^terminal/d;/^hiddenmenu/d" $BOOTDIR/grub/grub.conf
sed -i "/^default/aserial --unit=0 --speed=9600 --word=8 --parity=no --stop=1\nterminal --timeout=5 serial console" $BOOTDIR/grub/grub.conf
fi