PoC Handling Obsoletes by dnf

dnf-obsletes-test.sh

# Run a clean CentOS 8 Docker container
docker run --name dnf-obsoletes-test --rm -it centos:8 bash

# Inside the container install the necessary RPM building tools
dnf install -y rpmdevtools rpm-build redhat-rpm-config createrepo glibc-langpack-en

# Setup the environment
export LANG="en_US.UTF-8"
rpmdev-setuptree
SOURCEDIR="$(rpm --eval '%{_sourcedir}')"
RPMDIR="$(rpm --eval '%{_rpmdir}')"
ARCH="$(rpm --eval '%{_arch}')"

# Create and build obsoleted and successor example RPM packages

cat <<'EOF' > "${SOURCEDIR}/obsoleted-package.spec"
Name:       obsoleted-package
Version:    1.0.0
Release:    1
Summary:    Package to be obsoleted
License:    MIT
%description
%files
EOF

cat <<'EOF' > "${SOURCEDIR}/successor-package.spec"
Name:       successor-package
Version:    2.0.0
Release:    1
Summary:    Successor package
License:    MIT
Obsoletes:  obsoleted-package <= 1.0.0
%description
%files
EOF

rpmbuild -bb "${SOURCEDIR}"/*.spec

# Initialize the repo of the example packages

createrepo "${RPMDIR}/${ARCH}"

cat <<EOF > /etc/yum.repos.d/test.repo
[test]
name=test
baseurl=file://${RPMDIR}/${ARCH}
gpgcheck=0
EOF

dnf makecache

# Now, try to install the obsoleted-package
dnf install --downloadonly --nobest obsoleted-package

# However, it tries to install successor-package
#===================================================================================
# Package                    Architecture    Version            Repository     Size
#===================================================================================
#Installing:
# successor-package          x86_64          2.0.0-1            test          5.9 k
#
#Transaction Summary
#===================================================================================
#Install  1 Package
#
#Total size: 5.9 k
#Installed size: 0  
#DNF will only download packages for the transaction.
#Is this ok [y/N]: