Grub 1.98 include code in 00_header.in and grub-mkconfig.in to add
theme entries to /boot/grub.cfg, but it does not provide a similar
method for adding background images (wallpapers).
The patch included adds some lines just over GRUB_THEME entriens in
00_header.in to handle the background image. It will also look for
the image format and insert the module required by it.
I got parts of this patch (code) from somewhere else, but can't remember from.
https://savannah.gnu.org/bugs/index.php?29252
diff -urN grub-1.98.orig/util/grub.d/00_header.in grub-1.98/util/grub.d/00_header.in
--- grub-1.98.orig/util/grub.d/00_header.in 2010-03-10 20:30:56.319608325 -0400
+++ grub-1.98/util/grub.d/00_header.in 2010-03-10 23:01:20.856612701 -0400
@@ -104,6 +104,20 @@
terminal gfxterm
fi
EOF
+if [ x$GRUB_BACKGROUND != x ] && [ -f $GRUB_BACKGROUND ] \
+ && is_path_readable_by_grub $GRUB_BACKGROUND; then
+ echo "Found background: $GRUB_BACKGROUND" >&2
+ case $GRUB_BACKGROUND in
+ *.png) reader=png ;;
+ *.tga) reader=tga ;;
+ *.jpg|*.jpeg) reader=jpeg ;;
+ esac
+ prepare_grub_to_access_device `${grub_probe} --target=device $GRUB_BACKGROUND` | sed -e "s/^/ /"
+ cat << EOF
+ insmod $reader
+ background_image (\$root)`make_system_path_relative_to_its_root $GRUB_BACKGROUND`
+EOF
+fi
if [ x$GRUB_THEME != x ] && [ -f $GRUB_THEME ] \
&& is_path_readable_by_grub $GRUB_THEME; then
echo "Found theme: $GRUB_THEME" >&2
diff -urN grub-1.98.orig/util/grub-mkconfig.in grub-1.98/util/grub-mkconfig.in
--- grub-1.98.orig/util/grub-mkconfig.in 2010-03-10 20:30:56.319608325 -0400
+++ grub-1.98/util/grub-mkconfig.in 2010-03-10 20:34:00.689582261 -0400
@@ -220,6 +220,7 @@
GRUB_DISABLE_LINUX_UUID \
GRUB_DISABLE_LINUX_RECOVERY \
GRUB_GFXMODE \
+ GRUB_BACKGROUND \
GRUB_THEME \
GRUB_GFXPAYLOAD_LINUX \
GRUB_DISABLE_OS_PROBER \
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