Linux From Scratch (w/Pacman) - Version r12.3-6-wip

Chapter 8. Installing Basic System Software

8.61. Flit-Core-3.11.0

Flit-core is the distribution-building parts of Flit (a packaging tool for simple Python modules).

Approximate build time: less than 0.1 SBU
Required disk space: 1.0 MB

8.61.1. Installation of Flit-Core

Create the PKGBUILD for the Flit-Core package with the following commands: 

mkdir /sources/flit-core
cd /sources/flit-core
cat > PKGBUILD << "REALEOF"
# Maintainer: Linux From Scratch <lfs-dev@lists.linuxfromscratch.org>

pkgname="flit-core"
pkgver="3.11.0"
pkgrel="1"
pkgdesc="Flit-core is the distribution-building parts of Flit (a packaging tool for simple Python modules)."
arch=('any')
url="https://pypi.org/project/flit-core/"
license=('BSD3C')
groups=('core')
depends('python')
optdepends=('pytest'
            'testpath')
source=('https://pypi.org/packages/source/f/flit-core/flit_core-3.11.0.tar.gz')
md5sums=('6d677b1acef1769c4c7156c7508e0dbd')

build(){
  cd "${pkgname}-${pkgver}"
  pip3 wheel -w dist --no-cache-dir --no-build-isolation --no-deps $PWD
}

package(){
  cd "${pkgname}-${pkgver}"
pip3 install --root "${pkgdir}" --no-index --find-links dist flit_core
}
REALEOF

Prepare the build directory for the pacman user and build the package: 

chown -R root:pacman .
chmod 2775 .
chmod 664 PKGBUILD
su pacman -c 'makepkg -L --nodeps'

Add the newly created package to the central package repository: 

cp flit-core-3.11.0-1-any.pkg.tar.xz \
   /srv/pacman/repos/LFS/
repo-add /srv/pacman/repos/LFS/LFS.db.tar.xz \
         /srv/pacman/repos/LFS/flit-core-3.11.0-1-any.pkg.tar.xz

Update the local cache and install the Flit-Core package: 

pacman -Syu
pacman -S flit-core --overwrite \* -dd --noconfirm

Finally, copy the source files into the source repository and clean up the build directory: 

mkdir /srv/pacman/source/LFS/flit-core
cp PKGBUILD /srv/pacman/source/LFS/flit-core
cd /sources
rm -rf flit-core

The meaning of the pip3 configuration options and commands:

wheel

This command builds the wheel archive for this package.

-w dist

Instructs pip to put the created wheel into the dist directory.

--no-cache-dir

Prevents pip from copying the created wheel into the /root/.cache/pip directory.

install

This command installs the package.

--no-build-isolation, --no-deps, and --no-index

These options prevent fetching files from the online package repository (PyPI). If packages are installed in the correct order, pip won't need to fetch any files in the first place; these options add some safety in case of user error.

--find-links dist

Instructs pip to search for wheel archives in the dist directory.

8.61.2. Contents of Flit-Core

Installed directory: /usr/lib/python3.13/site-packages/flit_core and /usr/lib/python3.13/site-packages/flit_core-3.11.0.dist-info