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

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#!/bin/bash
set -eu
set -o pipefail
[ -n "$TARGET_ROOT" ]
source $_LIB/img-functions
WORKDIR=$(pwd)
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 -print | sudo cpio -o -H newc | gzip > $WORKDIR/$IMAGE_NAME.initramfs
select_boot_kernel_initrd $TARGET_ROOT
sudo cp $BOOTDIR/$KERNEL $WORKDIR/$IMAGE_NAME.vmlinuz