Initial commit of LFS notes and scripts.

lfs-notes/p2_preparing_the_build/c4_final_prep/c4_notes.md

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+# Chapter 4 
+## Section 1 Intro
+## Section 2 Simple File Structure
+We start by building simple of the early pieces of the file structure.
+The following is to be performed as root. These directories are not owned by an unprivileged user.
+```
+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
+```
+We will also make a special, temporary directory for the cross compiler toolchain.
+`mkdir -pv $LFS/tools`
+## Section 3 The lfs User
+As a measure of caution, let's proceed with the remaining steps as a normal user.
+We will use the name lfs since it is unlikely to be found on the host system.
+```
+groupadd lfs
+useradd -s /bin/bash -g lfs -m -k /dev/null lfs
+```
+Though not strictly required, we can set the password for the lfs user.
+`passwd lfs`
+Then, let's transfer ownership of this simple file structure to the lfs user.
+```
+chown -v lfs $LFS/{usr{,/*},lib,var,etc,bin,sbin,tools}
+case $(uname -m) in
+  x86_64) chown -v lfs $LFS/lib64 ;;
+esac
+```
+Finally, let's become lfs.
+`su - lfs`
+## Section 4 Setting Up The Environment
+Create the bash profile for lfs.
+```
+cat > ~/.bash_profile << "EOF"
+exec env -i HOME=$HOME TERM=$TERM PS1='\u:\w\$ ' /bin/bash
+EOF
+```
+And the bashrc for lfs.
+```
+cat > ~/.bashrc << "EOF"
+set +h
+umask 022
+LFS=/mnt/lfs
+LC_ALL=POSIX
+LFS_TGT=$(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
+```
+Since this system will only be used for this project, it is safe to force builds to use all cores.
+```
+cat >> ~/.bashrc << "EOF"
+export MAKEFLAGS=-j$(nproc)
+EOF
+```
+Finally, let's load this new environment setup contained within the bash profile and rc.
+`source ~/.bash_profile`
+
+