Description of problem:

After upgrading libdnf from libdnf-0.39.1-1.fc30.x86_64 to libdnf-0.43.1-3.fc30.x86_64, libdnf-plugin-swidtags seems no longer invoked.

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

libdnf-0.43.1-3.fc30.x86_64

How reproducible:

Deterministic.

Steps to Reproduce:
# Have PackageKit with libdnf-plugin-swidtags
1. dnf install -y PackageKit git-core libdnf-plugin-swidtags

# We will only use the libdnf-plugin-swidtags upstream repo to get tests data
2. git clone https://github.com/swidtags/libdnf-plugin-swidtags.git
3. cp -rp libdnf-plugin-swidtags/tests/repo /repo
4. cp libdnf-plugin-swidtags/tests/test-libdnf-swidtags.repo /etc/yum.repos.d/
5. pkcon install -y hello
6. rpm -q hello
7. ls -la /usr/lib/swidtag/example^2ftest/

Actual results:

# pkcon install -y hello
Resolving                     [=========================]         
Installing                    [=========================]         
Loading cache                 [=========================]         
Finished                      [=========================]         
Installing                    [=========================]         
Testing changes               [=========================]         
Installing packages           [=========================]         
Finished                      [=========================]         
# rpm -q hello
hello-2.0-1.x86_64
# ls -la /usr/lib/swidtag/example^2ftest/
ls: cannot access '/usr/lib/swidtag/example^2ftest/': No such file or directory

Expected results:

# pkcon install -y hello
Resolving                     [=========================]         
Installing                    [=========================]         
Loading cache                 [=========================]         
Finished                      [=========================]         
Installing                    [=========================]         
Testing changes               [=========================]         
Installing packages           [=========================]         
Finished                      [=========================]         
# rpm -q hello
hello-2.0-1.x86_64
# ls -la /usr/lib/swidtag/example^2ftest/
total 8
drwxr-xr-x. 2 root root  124 Feb 29 05:43  .
drwxr-xr-x. 4 root root   53 Feb 29 05:43  ..
-rw-r--r--. 1 root root 6902 Feb 29 05:43 'example^2ftest.hello-2.0-1.x86_64-rpm-ef920781af3bf072ae9888eec3de1c589143101dff9cc0b561468d395fb766d9.swidtag'

Additional info:

To see the working setup with the older libdnf 0.39, downgrade via:

8. pkcon remove -y hello
9. pkcon quit
# Allow removal of dnf during the downgrade
10. echo protected_packages= >> /etc/dnf/dnf.conf
11. dnf downgrade -y --allowerasing https://kojipkgs.fedoraproject.org//packages/libdnf/0.39.1/1.fc30/x86_64/libdnf-0.39.1-1.fc30.x86_64.rpm https://kojipkgs.fedoraproject.org//packages/libdnf/0.39.1/1.fc30/x86_64/python3-libdnf-0.39.1-1.fc30.x86_64.rpm https://kojipkgs.fedoraproject.org//packages/libdnf/0.39.1/1.fc30/x86_64/python3-hawkey-0.39.1-1.fc30.x86_64.rpm
12. pkcon install -y hello
13. ls -la /usr/lib/swidtag/example^2ftest/

to see

total 8
drwxr-xr-x. 2 root root  124 Feb 29 05:43  .
drwxr-xr-x. 4 root root   53 Feb 29 05:43  ..
-rw-r--r--. 1 root root 6902 Feb 29 05:43 'example^2ftest.hello-2.0-1.x86_64-rpm-ef920781af3bf072ae9888eec3de1c589143101dff9cc0b561468d395fb766d9.swidtag'

Microdnf does not seem to have that problem.

The regression was uncovered by https://travis-ci.org/swidtags/libdnf-plugin-swidtags/builds/645373412 passing 26 days ago, and https://travis-ci.org/swidtags/libdnf-plugin-swidtags/builds/656268671 failing yesterday, with the same code (just test on Fedora 32 was added).

The problem is on all Fedora versions, not just 30.