#!/bin/sh


LOCALVERSION="-x86_64"


if [ "$1" != "" ]; then
	LOCALVERSION="-eo${1}"
fi


echo "Going after kernel with localversion ${LOCALVERSION}"

sleep 2

PARAM="--no-clean --no-save-config --no-clean --mountboot \
        --no-lvm \
        --busybox \
        --mdadm \
        --no-iscsi \
        --e2fsprogs \
        --disklabel \
        --hyperv \
        --virtio \
        --zfs \
        --install \
        --microcode \
        --kernel-localversion=${LOCALVERSION}
"

genkernel $PARAM all || exit 1
emerge @module-rebuild || exit 1
genkernel $PARAM initramfs || exit 1

########### ShiftFS


echo "Now rebuilding shiftfs"

S=`dirname $0`
T="/usr/src/shiftfs"
mkdir -p $T

echo "LOCALVERSION=${LOCALVERSION}" > $T/Makefile

cat >>$T/Makefile <<'EOF' 

modname := shiftfs
obj-m := $(modname).o

KVERSION := $(shell readlink /usr/src/linux | tr -d '/' | cut -b 7- )
KDIR := /lib/modules/$(KVERSION)$(LOCALVERSION)
PWD := "$$(pwd)"

ifdef DEBUG
CFLAGS_$(obj-m) := -DDEBUG
endif

EXTRA_CFLAGS := -DSHIFTFS_MAGIC=0x6a656a62

default:
	$(MAKE) -C $(KDIR)/build M=$(PWD) EXTRA_CFLAGS="${EXTRA_CFLAGS}" modules

clean:
	$(MAKE) O=$(PWD) -C $(KDIR)/build M=$(PWD) clean

load:
	-rmmod $(modname)
	insmod $(modname).ko

install:
	install -m 0755 -o root -g root -d $(KDIR)/extra/fs
	install -m 0755 -o root -g root $(modname).ko $(KDIR)/extra/fs/
	depmod -a $(KVERSION)$(LOCALVERSION)

uninstall:
	rm $(KDIR)/extra/fs/$(modname).ko
	depmod -a $(KVERSION)$(LOCALVERSION)


EOF



#cp ${S}/Makefile.shiftfs $T/Makefile || exit 1
mv -f $T/shiftfs.c $T/shiftfs.c.bak 2> /dev/null
wget -O $T/shiftfs.c  https://git.launchpad.net/~ubuntu-kernel/ubuntu/+source/linux/+git/focal/plain/fs/shiftfs.c
make -C $T clean && make -C $T && make -C $T install || exit 1

echo Complete with success