Linux From Scratch

caveats

host requirements

apt install -y binutils bison gcc g++ make texinfo

ls -snf /usr/bin/gawk /usr/bin/awk
ls -snf /usr/bin/bash /usr/bin/sh

3. download source

export LFS=/mnt/lfs
mkdir -v $LFS/sources
chmod -v a+wt $LFS/sources
wget https://www.linuxfromscratch.org/lfs/view/stable/wget-list-sysv
wget --input-file=wget-list-sysv --continue --directory-prefix=$LFS/sources
# from mirror
wget -m -nH --cut-dirs=3 -np --reject 'index.*' --directory-prefix=$LFS/sources -e robots=off https://mirrors.ustc.edu.cn/lfs/lfs-packages/12.1/

chown root:root $LFS/sources/*

4. build preparing

diretory layout

mkdir -pv $LFS/{etc,var} $LFS/usr/{bin,lib,sbin}

for i in bin lib sbin; do
  ln -sv usr/$i $LFS/$i
done

case $(uname -m) in
  x86_64) mkdir -pv $LFS/lib64 ;;
esac

mkdir -pv $LFS/tools

lfs user

groupadd lfs
useradd -s /bin/bash -g lfs -m -k /dev/null lfs

chown -v lfs $LFS/{usr{,/*},lib,var,etc,bin,sbin,tools}
case $(uname -m) in
  x86_64) chown -v lfs $LFS/lib64 ;;
esac

su - lfs

build enviroment

cat > ~/.bash_profile << "EOF"
exec env -i HOME=$HOME TERM=$TERM PS1='\u:\w\$ ' /bin/bash
EOF

cat > ~/.bashrc << "EOF"
set +h
umask 022
LFS=/mnt/lfs
LC_ALL=POSIX
LFS_TGT=$(uname -m)-lfs-linux-gnu
PATH=/usr/bin
if [ ! -L /bin ]; then PATH=/bin:$PATH; fi
PATH=$LFS/tools/bin:$PATH
CONFIG_SITE=$LFS/usr/share/config.site
export LFS LC_ALL LFS_TGT PATH CONFIG_SITE
EOF

cat >> ~/.bashrc << "EOF"
export MAKEFLAGS=-j$(nproc)
EOF

source ~/.bash_profile

5. cross compiling toolchain

binutils
gcc
- mpfr
- gmp
- mpc
linux(Linux API Headers)
glibc
libstdc++(standard C++ library)

tar -xf

6. compiling tools

M4
Ncurses
Bash
Coreutils
Diffutils
File
Findutils
Gawk
Grep
Gzip
Make
Patch
Sed
Tar
Xz
Binutils
GCC

ln -sv libncursesw.so $LFS/usr/lib/libncurses.so

7. chroot environment

virtual kernel file system

mkdir -pv $LFS/{dev,proc,sys,run}

mount -vt devpts devpts -o gid=5,mode=0620 $LFS/dev/pts
mount -vt proc proc $LFS/proc
mount -vt sysfs sysfs $LFS/sys
mount -vt tmpfs tmpfs $LFS/run

stringang/linux-from-scratch.md

Linux From Scratch

caveats

host requirements

3. download source

4. build preparing

diretory layout

lfs user

build enviroment

5. cross compiling toolchain

6. compiling tools

7. chroot environment

reference