Install systemd package early

[m-blaha]

Since version 42 Fedora comes with pre-installed
systemd-standalone-sysusers package which conflicts with systemd
package which prevents dnf5daemon-server from being installed.

See errors during the container build here: https://artifacts.dev.testing-farm.io/8d2a79aa-95f5-41b4-b09c-42e6f65a5ede/

[kontura]

I might be mistaken but doesn't the error happen a bit earlier in the dnf5 -y install $COPR_RPMS;?

[jrohel]

I reproduced the issue locally. And this PR (adding --allowerasing to dnf5 -y builddep ...) fixed the problem.

There is another approach. To explicitly install systemd as soon as possible (right after the upgrade). But what's better...

# enable dnf5
RUN set -x && \
    dnf -y --refresh upgrade; \
    dnf -y install systemd --allowerasing; \
    dnf -y install dnf5 dnf5-plugins; \
    ...

[kontura]

I think it can fail in either of the builddep step or the dnf5 -y install $COPR_RPMS I mentioned.
When the COPR and COPR_RPMS environment variables are set (like in the linked log) it fails there (because it can also install dnf5daemon-server package), if they are not set it fails in the builddep step.

I would probably explicitly install systemd as soon as possible to prevent these issues. It would also be good to add a comment explaining why its done.

[m-blaha]

Good points guys, I've changed the fix to the proposed solution.

[jrohel]

Thanks.