build_initrd.sh

#!/bin/bash

set -e
source ./.config.sh || exit 1

echo "Building initramfs"
cd "$INITRAMFS_BUILD" || dd "Cannot cd inside initramfs root folder '$INITRAMFS_BUILD'"

chmod u+x init || dd "Init not found in $INITRAMFS_BUILD/init"
mkdir -p bin/ dev/ etc/ proc/ sys/ mnt/
cp -f "$BUSYBOX_SRC/busybox" 'bin/busybox'
ln -s busybox bin/sh 2> /dev/null || true

echo "Creating initramfs cpio archive"
find . -print0 | cpio --null -ov --format=newc | gzip --best > "$BUILDS/initramfs.cpio.gz" # TODO performance check for best algo or no compression at all
cp -f "$BUILDS/initramfs.cpio.gz" "$TARGET/boot/initrd"