DFS (CLI)

This project allows you to build a linux distro from scratch

What do we do?

we need some dependencies so install these

sudo apt get install bzip2 git vim make gcc libncurses-dev flex bison bc cpio libelf-dev libssl-dev syslinux dosfstools

now we need to clone the Linux Kernel and edit it

git clone --depth 1 https://github.com/torvalds/linux.git

now Change to the Linux directory

cd linux

now we need to edit the kernel by editing the options this will open an interactive menu

make menuconfig

make sure 64 bit kernel (NEW) is selected

then after making the menuconfigif you have any more cores than 6 than you can make it more than 6 such as i have 8 Cores

make -j 8

After the kenel finished compiling (GENTOO MOMENT) you will see a message with bZimage, make a directory named boot-files

mkdir /boot-files

then copy the bZimage to the boot-files directory

cp arch/x86/boot/bzImage /boot-files

bzImage is a file for booting the system cd back

cd ..

now clone busybox

git clone --depth 1 https://git.busybox.net/busybox

then enter busybox directory

cd busybox

then make the menuconfig

make menuconfig

go to settings > Build static binary (no shared libs) (NEW) select it now save, the reason we made static build is because we do not want external binaries now with the amount of cores you have run make -j <cores> like for example

make -j 8

after busybox finished compiling make an initramds

mkdir /boot-files/initramfs

now run

make CONFIG_PREFIX=/boot-files/initramfs install

initramfs is the initial file system the kernel loads after booting we will put busybox over there now move to that folder

cd /boot-files/initramfs/

now create a file called init

nano init

now add these commands to init

#!/bin/sh

/bin/sh

now save it now delete linuxrc no need for that file

rm linuxrc

now add exec permessions to init

chmod +x init

now find then pack it to a .cpio archive

find . | cpio -o -H newc > ../init.cpio

-o means create a new archive now go 1 dir back

cd ..

now the file has been created use ls to see it, but we will use a bootloader called syslinux make the bootfile

dd if=/dev/zero of=boot bs=1M count=50

this will make a file that is 50-100 megabytes and it will filled with zeros we will use the fat filesystem

mkfs -t fat boot 

then run

syslinux boot

now make a directory called anything but for safety we will use m then mount boot to m

mkdir m
mount boot m

then copy the kernel and initramfs to the boot fs

cp bzImage init.cpio m

now unmount it

unmount m

now the boot image is ready so we will boot it up

qemu-system-x86_64 boot

syslinux will boot up and will ask what file to boot use

/bzImage -initrd=init.cpio

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