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#!/usr/bin/sh
set -e
BUSY_BOX_VERSION="1.35.0"
KERNEL_VERSION="v5.10"
BUILD_BASE=$(pwd)/kernel-dev
INITRAMFS_BASE=$(pwd)/kernel-dev/initramfs
# wont run wihtout static busybox. the install target should be static too.
mkdir -p ./kernel-dev/busybox
cd ./kernel-dev/busybox &&\
wget https://www.busybox.net/downloads/busybox-$BUSY_BOX_VERSION.tar.bz2 &&\
tar -xvf busybox-$BUSY_BOX_VERSION.tar.bz2
cd busybox-$BUSY_BOX_VERSION &&\
make defconfig &&\
LD_FLAGS="--static" make -j4 && make install
cd "$BUILD_BASE" &&\
git clone --depth=1 --branch ${KERNEL_VERSION} https://github.com/torvalds/linux
cd linux &&\
make defconfig &&\
make -j12
cd "$BUILD_BASE" &&\
mkdir initramfs
(cd initramfs && mkdir -p bin sbin etc proc sys usr/bin usr/sbin dev tmp)
cp -a "${BUILD_BASE}"/busybox/busybox-$BUSY_BOX_VERSION/_install/* ./initramfs
cat > "$INITRAMFS_BASE"/bin/init <<EOL
#!/bin/sh
mount -t proc none /proc
mount -t sysfs none /sys
exec sh
EOL
chmod +x "$INITRAMFS_BASE"/bin/init
cat > "$INITRAMFS_BASE"/etc/inittab <<EOL
::sysinit:/etc/init.d/rcS
::respawn:-/bin/sh
::askfirst:-/bin/sh
::cttlaltdel:/bin/umount -a -r
EOL
chmod 755 "$INITRAMFS_BASE"/etc/inittab
mkdir -p "$INITRAMFS_BASE"/etc/init.d
cat > "$INITRAMFS_BASE"/etc/init.d/rcS <<EOL
echo "----------mount all in fstab----------------"
/bin/mount -a #Read / etc/fstab and load the file system
mkdir -p /dev/pts
mount -t devpts devpts /dev/pts
echo /sbin/mdev > /proc/sys/kernel/hotplug
mdev -s
echo "****************Hello Hello******************"
echo "Kernel Version:linux-5.4.50"
echo "***********************************************"
EOL
chmod 755 "$INITRAMFS_BASE"/etc/init.d/rcS
cat > "$INITRAMFS_BASE"/etc/fstab <<EOL
#device mount-point type option dump fsck
proc /proc proc defaults 0 0
temps /tmp rpoc defaults 0 0
none /tmp ramfs defaults 0 0
sysfs /sys sysfs defaults 0 0
mdev /dev ramfs defaults 0 0
EOL
cd "$INITRAMFS_BASE"/dev
sudo mknod console c 5 1
sudo mknod null c 1 3
sudo mknod tty1 c 4 1
# sudo mknod dev/ram b 1 0
cd "$INITRAMFS_BASE"
find . -print0 | cpio --null -ov --format=newc | gzip -9 > ../initramfs.cpio.gz
qemu-system-x86_64 \
-kernel "$BUILD_BASE"/linux/arch/x86/boot/bzImage \
-initrd "$BUILD_BASE"/initramfs.cpio.gz \
-nographic \
-m 512 \
-append "root=/dev/ram0 init=/bin/init console=ttyS0"
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