Please implement update --downloadonly

[mark-hyde]

Hi,
I'm testing how dnf 5 works with auter and have found that there is currently no --downloadonly option in the dnf5 update subcommand.

rackerlabs/auter#245

A typical auter use-case is to have a cronjob run at the start of a month, (which runs dnf/yum update --downloadonly) which resolves all dependencies and downloads the packages.
These can then be applied at a later date (typically staging devices might have packages installed a week or 2 before production), but because the packages were downloaded at the same time, you get pretty much the same packages in both staging and production servers even though they might have been patched some weeks apart.

Could you please implement dnf5 update --downloadonly

As a workaround I'm considering running 'dnf5 check-update', using awk to grab the 1st column, and feed that into dnf download with the --resolve flag, but I'm not entirely convinced yet that this will reliably give the same result.

[j-mracek]

Related to #555

[mark-hyde]

Hi,
I've
Could you also document this option in dnf5 --help? Auter checks this to see if the option is available.
While I could write around that, it would be better if it were documented in the help anyway.

[mark-hyde]

I created #602 as this is closed