#!/bin/bash -eu
# Build the initramfs, a basic system that is used by the kernel as init
# filesystem - also called 'rootfs'

# A lot of this code is borrowed from Tomas M. <http://www.linux-live.org>

echo "# Building rootfs"

startup_dir=$(pwd)
cd $(dirname $0)/../
BASE_DIR=$(pwd)
ROOTFS_DIR=$BASE_DIR/var/rootfs
TEMPFILE=$(tempfile)

function fun_mknod {
	if [ ! -e "$1" ]; then
		fakeroot -i $TEMPFILE -s $TEMPFILE mknod $@
	fi
}

# create devices
echo "## Creating devices"
fun_mknod $ROOTFS_DIR/dev/console c 5 1
chmod a+rw $ROOTFS_DIR/dev/console
fun_mknod $ROOTFS_DIR/dev/null c 1 3
fun_mknod $ROOTFS_DIR/dev/ram b 1 1
fun_mknod $ROOTFS_DIR/dev/systty c 4 0
fun_mknod $ROOTFS_DIR/dev/tty c 5 0
for i in 1 2 3 4 5 6; do
	fun_mknod $ROOTFS_DIR/dev/tty$i c 4 $i
done

chmod a+rw $ROOTFS_DIR/dev/tty*

# generate module dependencies
KERNEL_NAME="$(strings $BASE_DIR/install_cd/isolinux/bzImage \
	| grep deeprootlinux \
	| cut -d' ' -f1)"
mkdir -p $ROOTFS_DIR/lib/modules/$KERNEL_NAME
depmod --basedir $ROOTFS_DIR -v $KERNEL_NAME

# attach bootsplash image
echo "## Attaching bootsplash image"
cd $BASE_DIR/var/rootfs/boot/DeepRootLinux/
$BASE_DIR/bin/splash -s -f bootsplash.cfg \
	> $ROOTFS_DIR/bootsplash

# create rootfs filesystem
if [ -f "$BASE_DIR/install_cd/isolinux/rootfs" ]; then
	echo "## Removing old rootfs filesystem"
	rm -f $BASE_DIR/install_cd/isolinux/rootfs
fi
echo "## Creating rootfs filesystem"
cd $ROOTFS_DIR
find . \
	| fakeroot -i $TEMPFILE cpio -o -H newc \
	| gzip \
	> $BASE_DIR/install_cd/isolinux/rootfs

# clean
echo "## Cleaning"
rm $ROOTFS_DIR/bootsplash
rm $ROOTFS_DIR/dev/*
rm -R $ROOTFS_DIR/lib/modules
rm $TEMPFILE