diskimage-builder/elements/ironic-agent/cleanup.d/99-ramdisk-create

#!/bin/bash

if [ "${DIB_DEBUG_TRACE:-0}" -gt 0 ]; then
    set -x
fi
set -eu
set -o pipefail


[ -n "$TARGET_ROOT" ]

source $_LIB/img-functions

IMAGE_PATH=$(readlink -f $IMAGE_NAME)
cd $TARGET_ROOT

echo "#disabled" > ./tmp/fstab.new
sudo mv ./tmp/fstab.new ./etc/fstab
sudo ln -s ./sbin/init ./

sudo find . -path ./sys -prune -o -path ./proc -prune -o -path './tmp/*' -prune -o -path './boot/*' -prune -o -path './root/*' -prune -o -path './usr/lib/locale/*' -prune -o -path './usr/share/doc/*' -prune -o -path './usr/share/man/*' -prune -o -path './usr/share/info/*' -prune -o -path './usr/share/licenses/*' -prune -o -path './usr/share/misc/*' -prune -o -print | sudo cpio -o -H newc | gzip > ${IMAGE_PATH}.initramfs

select_boot_kernel_initrd $TARGET_ROOT
sudo cp $BOOTDIR/$KERNEL ${IMAGE_PATH}.vmlinuz