Download RHEL 8 repositories for air gap installation

[Eddy]

I'm trying to create a RHEL 8 minimum repository for offline installation as was performed in RHEL 7 but the same procedure produces partial results. I am following this procedure:

• Install vanilla RHEL 8
  • make sure there is 10G available under /var/local/repos
• Install all the extra packages required (in my case I am installing Foreman 2.1)
• Find all the pertinent repositories:

yum list installed | awk '{ print $3 }' | sort -u > repolist.txt

• Run the following script for all repositories as found:

for i in `cat repolist.txt`
do
for j in `yum list installed | grep @${i} | awk '{print $1}'`
do
yum -y reinstall $j --downloadonly --downloaddir=/var/local/repos/${j}
done
done

• Compare the results per repository with what is returned from 'yum list installed` and there are differences.
  
  • What makes this step very difficult is the naming difference between the RPM name and the repository name

If I try downloading the missing RPMs manually I fail on many interesting comments like the RPM is in cache.

Afterwards there are added complications with creating the repodata (see https://github.com/rpm-software-management/modulemd-tools for required additional tools).