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Description of problem:
PackageKit isn't correctly reading in all the vars from /etc/dnf/vars/ (and /etc/yum/vars/)


Version-Release number of selected component (if applicable):
PackageKit-1.1.12-2.el8

How reproducible:
100%

Steps to Reproduce:
1. Create a repo with a local variable in the url path
  example
  http://mirror.centos.org/$contentdir/$stream/AppStream/x86_64/os/repodata/repomd.xml

2. Define the variables in /etc/dnf/vars

3. dnf makecache

4. pkcon refresh

Actual results:
Fatal error: cannot update repo 'Stream-AppStream': Cannot download repomd.xml: Cannot download repodata/repomd.xml: All mirrors were tried; Last error: Status code: 404 for http://mirror.centos.org/$contentdir/$stream/AppStream/x86_64/os/repodata/repomd.xml

Expected results:
Variables are expanded in PackageKit in the same manner as dnf

Additional info:
https://github.com/hughsie/PackageKit/issues/339

Looking at the upstream bug, it was fixed in libdnf with https://github.com/rpm-software-management/libdnf/pull/801. Reassigning to libdnf.

*** This bug has been marked as a duplicate of bug 1756382 ***

The needinfo request[s] on this closed bug have been removed as they have been unresolved for 120 days