Bug 1955484

Description of problem:

I actually run into this on openSUSE MicroOS Desktop (snapshot 20210427), as it is switching to using MicroDNF and DNF through PackageKit for software management (see also https://bugzilla.redhat.com/show_bug.cgi?id=1946024 ).

In MicroOS, we would like to ignore RPM's weak dependencies. The situation is, however, like this:
 - if I install packages RPM with zypper (by means of transactional-update or tukit), weak dependencies are *not* installed, which is the correct behavior (kind of out of scope here, but just for reference)
 - if I install microdnf and install packages with it, weak dependencies are *not* installed, which is the correct behavior
 - if I install packages with pkcon, weak dependencies *are* installed, which is not what we want.

To prevent weak dependencies to be installed, we have "install_weak_deps=False" in /etc/dnf/dnf.conf. And this seems to be enough for microdnf to do the right thing.

However, it seems like it is being ignored by pkcon (which in turns led us to believe that it is in fact ignored by libdnf).

Version-Release number of selected component (if applicable):

$ rpm -qa {PackageKit,microdnf}
PackageKit-1.2.2-10.2.x86_64
microdnf-3.8.0-1.1.x86_64

How reproducible:

100%

Steps to Reproduce:

just `pkcon install <package>`, and you'll see that recommended packages are also being installed.

E.g., `pkconf install system-config-printer` (compared to `microdnf install system-config-printer`)

Actual results:

$ pkcon install system-config-printer
The following packages have to be installed:
 system-config-printer-1.5.15-1.1.x86_64	A printer administration tool
 system-config-printer-applet-1.5.15-1.1.noarch	Notification icon for printing via system-config-printer
 system-config-printer-dbus-service-1.5.15-1.1.noarch	D-Bus service to configure printing via system-config-printer

$ sudo microdnf install system-config-printer
Installing:                                                                                                                                                                                                                                   
 system-config-printer-1.5.15-1.1.x86_64                                                                                                                               repo-oss                                                       103.0\u00a0kB
Transaction Summary:
 Installing:        1 packages
 Reinstalling:      0 packages
 Upgrading:         0 packages
 Obsoleting:        0 packages
 Removing:          0 packages
 Downgrading:       0 package

Expected results:

That pkcon and microdnf behave the same (where the wanted behavior, in this case, is the microdnf one, i.e., no recommended packages).