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#!/bin/bash
copy_binary() {
BINARY="$1"
PREFIX="$2"
ldd "${BINARY}" | awk '{print $3}' | grep '^/' | \
while read lib; do
if [ -f "${lib}" ]; then
mkdir -p $(dirname "${PREFIX}/${lib}")
cp --archive "${lib}" "${PREFIX}/${lib}"
cp --archive $(readlink -f "${lib}") $(dirname "${PREFIX}/${lib}")/
fi
done
cp --archive "${BINARY}" "${PREFIX}${BINARY}"
}
INITROOT="./initroot"
mkdir -p ${INITROOT}
mkdir -p ${INITROOT}/{dev,etc,mnt/root,proc,root,sys,run,usr/share,usr/bin,usr/lib,usr/libexec,usr/lib/modules}
cd ${INITROOT}
ln -s usr/bin bin
ln -s usr/bin sbin
cd usr
ln -s bin sbin
ln -s lib lib64
cd ..
ln -s usr/lib lib
ln -s usr/lib lib64
cd ..
cp --archive /dev/{null,console,tty,nvme0n1,nvme0n1p2,zfs} ${INITROOT}/dev/
cp --archive /lib64/ld-linux-x86* ${INITROOT}/usr/lib/
copy_binary /usr/bin/zfs ${INITROOT}
copy_binary /usr/bin/mount.zfs ${INITROOT}
copy_binary /usr/bin/zpool ${INITROOT}
cp --archive /usr/bin/busybox ${INITROOT}/bin/busybox
cp --archive /usr/libexec/zfs ${INITROOT}/usr/libexec/zfs
cp --archive /usr/share/zfs ${INITROOT}/usr/share/zfs
cp --archive /usr/lib/modules/$(uname -r) ${INITROOT}/usr/lib/modules/
pushd ${INITROOT}/usr/lib/modules/$(uname -r)/kernel
rm -r drivers/gpu
rm -r drivers/firewire
rm -r drivers/gpio
rm -r drivers/leds
rm -r drivers/media
rm -r drivers/net
rm -r drivers/vfio
rm -r drivers/virtio
rm -r drivers/virt
rm -r drivers/soundwire
rm -r drivers/firmware
rm -r drivers/i2c
rm -r drivers/iommu
rm -r drivers/misc
rm -r drivers/powercap
rm -r drivers/pwm
rm -r drivers/scsi
rm -r drivers/usb
rm -r drivers/hid
rm -r drivers/extcon
rm -r drivers/mux
rm -r drivers/thermal
rm -r drivers/vdpa
rm -r drivers/dma
rm -r lib/test*
rm -r net
rm -r sound
rm -r fs
rm -r mm
popd
cp --archive ./extras/* ${INITROOT}/
cd ${INITROOT}
cat > init <<EOF
#!/bin/busybox sh
rescue_shell() {
echo "Oopsies something broke :("
exec sh
}
mount -t proc none /proc
mount -t sysfs none /sys
modprobe zfs
zpool import -N -d /dev/nvme0n1p2 soil || rescue_shell
zfs load-key soil || rescue_shell
mount.zfs -o zfsutil soil/ROOT/gentoo /mnt/root || rescue_shell
umount /proc
umount /sys
exec switch_root /mnt/root /sbin/init
EOF
chmod +x init
find . -print0 | cpio --null --create --verbose --format=newc | gzip --best > ../initramfs-$(uname -r).img
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