LFS (Part 1)

Chapter 1 and 2, Setup and Disc image

We will be needing few packages that we will install if they are not installed,

sudo apt-get install subversion xsltproc

run setup.sh which will create sourceMe.sh in the current folder. It will also download the book source to create other scripts and files.

sh /mnt/c/Users/<user>/Documents/linux/LFS/lfs-scripts/setup.sh

Now source sourceMe.sh to mount the scripts

$ source sourceMe.sh
Mounting /mnt/c/Users/<user>/Documents/linux/LFS/lfs-scripts on lfs-scripts
umount: lfs-scripts: not mounted.
sh: mount-lfs.sh: No such file or directory

Check the requirements for LFS,

sh lfs-scripts/version-check.sh

Change shell to bash from dash if necessary,

sh lfs-scripts/ch2bash.sh

Let us create an empty disk image with two partitions,

sh lfs-scripts/mkdiscimg.sh

This will create lfs.img with two partitions and a script mount-lfs.sh to mount the image. Check the image,

$ fdisk -lu lfs.img
Disk lfs.img: 10.26 GiB, 11010048000 bytes, 21504000 sectors
Units: sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disklabel type: dos
Disk identifier: 0x0e0d22a7

Device     Boot  Start      End  Sectors  Size Id Type
lfs.img1          8192   532479   524288  256M  c W95 FAT32 (LBA)
lfs.img2        532480 21503999 20971520   10G 83 Linux

Now source sourceMe.sh the second time to mount the image.

From now on, you can source sourceMe.sh before you start working to have everything setup after you boot between steps if necessary.

We are ready to go with chapter 3.

Chapter 3, Get sources

When we ran setup.sh, it downloaded the book and created,

• packages.sh
• patches.sh
• wget-list
• md5sums Feel free to examine them.

Lets proceed to download the sources,

sudo mkdir -v $LFS/sources
sudo chmod -v a+wt $LFS/sources
wget --input-file=wget-list --continue --directory-prefix=$LFS/sources
cp md5sums $LFS/sources
pushd $LFS/sources
md5sum -c md5sums
popd

Note that if a download fails you have to find an alternate source by googling and then adjust wget-list. At the time of this writing mpfr url had to be changed to https://ftp.gnu.org/gnu/mpfr/mpfr-4.0.2.tar.xz.

Writing a makefile using packages.sh and patches.sh could be an alternative.

We are ready to go with chapter 4.

Chapter 4, Setup user to build toolchain

create user lfs and set permissions,

sudo mkdir -v $LFS/tools
sudo ln -sv $LFS/tools /
sudo groupadd lfs
sudo useradd -s /bin/bash -g lfs -m -k /dev/null lfs
sudo passwd lfs
sudo chown -v lfs $LFS/tools
sudo chown -v lfs $LFS/sources

Login as lfs,

su - lfs

Setup lfs's environment,

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=/tools/bin:/bin:/usr/bin
export LFS LC_ALL LFS_TGT PATH
EOF

source ~/.bash_profile

This concludes chapter 4. Go to Part 2 for next chapters.