RockyRpi/Rocky8_Rpi4_mkimage.sh

#!/bin/bash


OUTDIR=$HOME/RockyRpi_image

mkdir -p ${OUTDIR}


time appliance-creator -v -c ./Rocky8_Rpi4.ks -n RockyRpi --version=20210626  --release=1 --vmem=1024 --no-compress -o ${OUTDIR}


# Post appliance-creator sequence to 

mkdir -p /mnt/tmp

# find the image we just made, and make it available on /dev/maper/loop* devices:
image=`find ${OUTDIR}  -iname *.raw | head -1`
echo "Getting UUID and inserting to boot from ${image} ....
kpartx -av  ${image}

# Get the UUID of our root partition (the ext4 one) (UUID=e3984938429 , strip out quotes("))
uuid=`blkid | grep "mapper/loop0p3" | head -1 | awk '{print $3}' | tr -d '"'`

# Mount the /boot partition:
mkdir -p /mnt/tmp
umount /mnt/tmp
mount /dev/mapper/loop0p1  /mnt/tmp

# Swap out the "root=" part of cmdline.txt for our "root=UUID=blah"
sed -i "s/root= /root=${uuid} /"  /mnt/tmp/cmdline.txt

# Debug check to make sure it looks right:
echo "cmdline.txt looks like this, please review:"
cat /mnt/tmp/cmdline.txt

# Finished, unmount:
umount /mnt/tmp