Improve FAI-CD ISO Grub2 menu

This requires a patch in fai-cd:

From 7600db048b6ce0a2046c966597f929e21a39607c Mon Sep 17 00:00:00 2001
From: Daniel Teichmann <daniel.teichmann@das-netzwerkteam.de>
Date: Tue, 2 Jul 2024 12:23:51 +0200
Subject: [PATCH] bin/fai-cd create_grub2_image(): Add grub background image +
 DejaVuSansMono font to memdisk.

Background image: /usr/share/images/desktop-base/desktop-grub.png
Font file: /usr/share/fonts/truetype/dejavu/DejaVuSansMono.ttf
---
 bin/fai-cd | 18 +++++++++++++-----
 1 file changed, 13 insertions(+), 5 deletions(-)

diff --git a/bin/fai-cd b/bin/fai-cd
index 9326c75b..06e308ba 100755
--- a/bin/fai-cd
+++ b/bin/fai-cd
@@ -188,10 +188,13 @@ create_squashfs_image() {
 # - - - - - - - - - - - - - - - - - - - - - - - - - -
 create_grub2_image() {
 
-    mkdir -p $tmp/boot
+    mkdir -p $tmp/boot/grub
+    # Needs grub2-common package
+    grub-mkfont -s 16 -o "${NFSROOT}/boot/grub/DejaVuSansMono.pf2" /usr/share/fonts/truetype/dejavu/DejaVuSansMono.ttf
 
     if [ -d $NFSROOT/usr/lib/grub/x86_64-efi ]; then
        cp $grub_config $NFSROOT/tmp/grub.cfg
+       cp /usr/share/images/desktop-base/desktop-grub.png $NFSROOT/tmp/background.png
        # insert date into grub menu
        perl -pi -e "s/_VERSIONSTRING_/   $isoversion     /" $NFSROOT/tmp/grub.cfg
        if [ -n "$config_space" ] || [ $configset -eq 1 ]; then
@@ -202,10 +205,13 @@ create_grub2_image() {
            --format=x86_64-efi \
            --output=/tmp/bootx64.efi \
            --locales="" --fonts="" \
-           "boot/grub/grub.cfg=/tmp/grub.cfg"
+           "boot/grub/grub.cfg=/tmp/grub.cfg" \
+           "boot/grub/background.png=/tmp/background.png" \
+           "boot/grub/DejaVuSansMono.pf2=/boot/grub/DejaVuSansMono.pf2"
+
        mv $NFSROOT/tmp/bootx64.efi $scratch
 
-       dd if=/dev/zero of=$scratch/efiboot.img bs=1M count=3 2>/dev/null
+       dd if=/dev/zero of=$scratch/efiboot.img bs=1M count=5 2>/dev/null
        mkfs.vfat $scratch/efiboot.img
        mmd -i $scratch/efiboot.img efi efi/boot
        mcopy -i $scratch/efiboot.img $scratch/bootx64.efi ::efi/boot/
@@ -217,9 +223,11 @@ create_grub2_image() {
            --format=i386-pc \
            --output=/tmp/core.img \
            --locales="" --fonts="" \
-           --install-modules="linux normal iso9660 biosdisk memdisk search ls echo test chain msdospart part_msdos part_gpt minicmd ext2 keystatus all_video font sleep gfxterm regexp" \
+           --install-modules="linux normal iso9660 biosdisk memdisk search ls echo test chain msdospart part_msdos part_gpt minicmd ext2 keystatus all_video font sleep gfxterm gfxterm_background png regexp" \
            --modules="linux normal iso9660 biosdisk search" \
-           "boot/grub/grub.cfg=/tmp/grub.cfg"
+           "boot/grub/grub.cfg=/tmp/grub.cfg" \
+           "boot/grub/background.png=/tmp/background.png" \
+           "boot/grub/DejaVuSansMono.pf2=/boot/grub/DejaVuSansMono.pf2"
        cat $NFSROOT/usr/lib/grub/i386-pc/cdboot.img $NFSROOT/tmp/core.img > $scratch/bios.img
        rm $NFSROOT/tmp/core.img
     else
-- 
2.39.2