diskimage-builder/elements/dracut-network/finalise.d/98-regenerate-initramfs

#!/bin/bash

# Prioritize PAE if present
KERNEL=$(basename `ls -1rv /boot/vmlinuz*  | grep PAE | grep -v debug | head -1`)
if [ ! $KERNEL ]; then
    KERNEL=$(basename `ls -1rv /boot/vmlinuz* | grep -v debug | head -1`)
    if [ ! $KERNEL ]; then
        echo "No suitable kernel found."
        exit 1
    fi
fi
KERNEL_VERSION=`echo $KERNEL | sed 's/vmlinuz-//g'`
RAMDISK=/boot/initramfs-$KERNEL_VERSION.img

dracut --force --add "network" $RAMDISK $KERNEL_VERSION