dnf5 system_cachedir option does not expand $releasever like the cachedir option does

[OndrejPopp]

Given that $releasever expands to 41

and the following in /etc/dnf/dnf.conf,

...
cachedir=/packages/dnf/$releasever
system_cachedir=/packages/dnf/$releasever
...

When dnf is run though sudo, so sudo dnf ... it correctly uses /packages/dnf/41 for the cachedir

However when run as the superuser, so
# dnf ...
it uses/creates /packages/dnf/'$releasever' for the cachedir which means that $releasever is not expanded for the system_cachedir option like it is for the cachedir option.

It is possible that more than just $releasever are not expanded.

kind regards,
Ondrej

[pkratoch]

Thanks for the report, the issue is valid.

I think it might be due to this:
https://github.com/rpm-software-management/dnf5/blob/main/libdnf5/conf/config_main.cpp#L1318
ConfigMan::load_from_parser first calls the Config::load_from_parser (which does the variable substitution) and then it additionally sets the cachedir to system_cachedir if run as superuser, but without the substitution.