generic-arm64-kickstart/includes/rootfs-expand.ksi

%post
cat << EOF > /usr/local/bin/rootfs-expand
#!/usr/bin/env bash
set -euf -o pipefail

ROOT_PART=\$(mount | grep ' on / ' | awk '{print \$1}')
if [[ \${ROOT_PART} =~ "mmcblk" || \${ROOT_PART} =~ "nvme" ]]; then
    DEV=\$(echo "\${ROOT_PART}" | rev | sed -r 's/^.{2}//' | rev)
    INTERMEDIATE_DEV="\${DEV}p"
elif [[ \${ROOT_PART} =~ "vd" || \${ROOT_PART} =~ "sd" ]]; then
    DEV=\$(echo "\${ROOT_PART}" | rev | sed -r 's/^.{1}//' | rev)
    INTERMEDIATE_DEV="\${DEV}"
else
    >&2 echo "\$0: device type unsupported"
    exit 1
fi
PART_NUM="\${ROOT_PART#"\$INTERMEDIATE_DEV"}"

echo "\${DEV} \${PART_NUM} \${ROOT_PART}"

echo "Extending partition \${PART_NUM} of \${DEV} to max size..."
growpart "\${DEV}" "\${PART_NUM}"

echo "Resising ext4 filesystem on \${ROOT_PART}..."
resize2fs "\${ROOT_PART}"

echo "Done."
df -kh | head -n 1 && df -kh | grep "\${DEV}" | sort
EOF

chmod +x /usr/local/bin/rootfs-expand
%end