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125 lines
3 KiB
Markdown
125 lines
3 KiB
Markdown
# lfs-scripts
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Instructions and scripts to build LFS (Linux From Scratch) 10.0 as simply as possible
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# Foreword
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First, this guide does not replace reading the whole LFS book. I highly recommend that you read it, at least once, and then go to the automation scripts provided here.
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This build will be done inside a virtual machine, for that I'll be using Oracle VirtualBox, but you can use the tool you prefer. I'm running an Arch Linux VM, feel free to use your GNU/Linux distro of preference. Just be sure to install the development tools (base-devel package on Arch).
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My VM has two virtual hard disks: one for the host (Arch Linux itself) and another for building LFS. You could also use a single hard disk with two partitions, that's up to personal preference. I've decided to use two separate hard disks so I can completely isolate LFS from the host after the build. At the end, you'll be able to create a separate VM and boot it.
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The packages needed to build LFS were obtained from ftp://ftp.lfs-matrix.net/pub/lfs/lfs-packages/lfs-packages-10.0.tar (423 MB), other mirrors are available at http://linuxfromscratch.org/lfs/download.html
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# Build instructions
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Create a partition and a filesystem in the virtual hard disk (/dev/sdb). Run commands as root:
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```
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mkdir /mnt/lfs
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fdisk /dev/sdb
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```
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Use the following basic options:
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n- new partition
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<Enter> for all default values
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w- write changes
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Create a filysystem, a mount point, and mount it:
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```
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mkfs.ext4 /dev/sdb1
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mkdir /mnt/lfs
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mount /dev/sdb1 /mnt/lfs
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```
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Include the following command to root's .bashrc:
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```
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export LFS=/mnt/lfs
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```
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Source the file to use the variable:
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```
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source .bashrc
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```
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Download all the packages and extract them to /mnt/lfs/sources.
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```
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cd $LFS
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cp /<location_of_the_package>/lfs-packages-10.0.tar .
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tar xf lfs-packages-10.0.tar
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mv 10.0 sources
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chmod -v a+wt $LFS/sources
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```
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Create the basic filesystem:
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```
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mkdir -pv $LFS/{bin,etc,lib,sbin,usr,var,lib64,tools}
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```
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Create the lfs user, used during the initial build process:
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```
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groupadd lfs
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useradd -s /bin/bash -g lfs -m -k /dev/null lfs
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passwd lfs
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```
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You will have to type a password.
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Make lfs the owner of the filesystem:
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```
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chown -R lfs:lfs $LFS/*
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chown lfs:lfs $LFS
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```
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Login as the lfs user:
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```
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su - lfs
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```
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Create a .bash_profile file:
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```
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cat > ~/.bash_profile << "EOF"
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exec env -i HOME=$HOME TERM=$TERM PS1='\u:\w\$ ' /bin/bash
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EOF
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```
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Create a .bashrc file:
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```
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cat > ~/.bashrc << "EOF"
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set +h
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umask 022
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LFS=/mnt/lfs
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LC_ALL=POSIX
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LFS_TGT=$(uname -m)-lfs-linux-gnu
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PATH=/usr/bin
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if [ ! -L /bin ]; then PATH=/bin:$PATH; fi
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PATH=$LFS/tools/bin:$PATH
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export LFS LC_ALL LFS_TGT PATH
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EOF
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source ~/.bash_profile
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```
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Copy all the scripts from this repository to your $LFS directory:
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```
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cp /<location_of_the_scripts>/*.sh $LFS
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```
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Now, run the lfs-cross.sh script, which will build the cross-toolchain and cross compiling temporary tools from chapters 5 and 6. The build took 30 min on my machine:
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```
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cd $LFS
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sh lfs-cross.sh | tee lfs-cross.log
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```
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