#!/bin/bash
ROOTDIR=$(pwd)
ARCH=arm64
CROSS_COMPILE=aarch64-linux-gnu-
#build rootfs from busybox

# download
if [ ! -e "busybox-1.35.0.tar.bz2" ]; then
	echo -e '\e[1;33mDownload busybox-1.35.0 ...\e[0m'
	sleep 1
	wget https://busybox.net/downloads/busybox-1.35.0.tar.bz2
fi

if [ $? -ne 0 ]; then
	exit
fi

echo -e '\e[1;32mBuild Rootfs ...\e[0m'
#build busybox
export ARCH=arm64
export CROSS_COMPILE=aarch64-linux-gnu-

if [ ! -d "busybox-1.35.0" ]; then
	tar xvf busybox-1.35.0.tar.bz2
fi

cd busybox-1.35.0/

if [ ! -d "_install" ]; then
	echo -e '\e[1;32mBuild busybox ...\e[0m'
	make menuconfig #-> settings --> [*] Build static binary (no shared libs)
	
	make

	make install
fi
#finish _install/
cd _install/
mkdir -p dev etc lib sys proc tmp var home root mnt

cd etc/
touch profile
echo '
#!/bin/sh
export HOSTNAME=kobey
export USER=root
export HOME=/home
export PS1="\[\e[33;1m\]kobey\[\e[31;1m\]@root \[\e[36;1m\]\w\[\e[33;1m\] ~# \[\e[0m\]"
PATH=/bin:/sbin:/usr/bin:/usr/sbin
LD_LIBRARY_PATH=/lib:/usr/lib:$LD_LIBRARY_PATH
export PATH LD_LIBRARY_PATH' > profile

touch inittab
echo "::sysinit:/etc/init.d/rcS
::respawn:-/bin/sh
::askfirst:-/bin/sh
::ctrlaltdel:/bin/umount -a -r" > inittab

touch fstab
echo "#device  mount-point    type     options   dump   fsck order
proc /proc proc defaults 0 0
tmpfs /tmp tmpfs defaults 0 0
sysfs /sys sysfs defaults 0 0
tmpfs /dev tmpfs defaults 0 0
debugfs /sys/kernel/debug debugfs defaults 0 0
kmod_mount /mnt 9p trans=virtio 0 0" > fstab

mkdir init.d
cd init.d/
touch rcS
sleep 1
chmod +x rcS
sleep 1
echo "mkdir -p /sys
mkdir -p /tmp
mkdir -p /proc
mkdir -p /mnt
/bin/mount -a
mkdir -p /dev/pts
mount -t devpts devpts /dev/pts
echo /sbin/mdev > /proc/sys/kernel/hotplug
mdev -s
echo ''
echo -e '\t\e[1;33;47mWelcome to Linux~\e[0m'
echo ''

" > rcS

cd ../../dev/
sudo mknod console c 5 1

cd ../lib/
cp -p /usr/aarch64-linux-gnu/lib/*.so* -a .

aarch64-linux-gnu-strip * > /dev/null 2>&1

cd ${ROOTDIR}
echo $(pwd)

if [ ! -d "_install_arm64" ]; then
	echo -e '\e[1;32mbuild a path name _install_arm64 ...\e[0m'
	mkdir _install_arm64
fi

sudo cp -rvpf ${ROOTDIR}/busybox-1.35.0/_install/*  ${ROOTDIR}/_install_arm64/
if [ $? -eq 0 ]; then
	source $(pwd)/03_kobey_codes/17_shell/02_script/02_build_rootfs_ext4.sh
	echo -e '\e[1;32mbuild rootfs done!\e[0m'
else
	echo -e "\e[1;31mbuild rootfs failed!\e[0m"
fi