Modify dnf and microdnf obsoletes for RHEL

[j-mracek]

The patch prevents replacement of microdnf and dnf by dnf5 in RHEL10 and previous versions.

[j-mracek]

It requires additional change in DNF related to dnf.conf.

[evan-goode]

LGTM! On a Rawhide system, I was able to upgrade DNF 5 with this patch and then install DNF with rpm-software-management/dnf#1975.

Note: I was unable to do this in a single transaction, but that shouldn't be an issue.

[j-mracek]

LGTM! On a Rawhide system, I was able to upgrade DNF 5 with this patch and then install DNF with rpm-software-management/dnf#1975.

Note: I was unable to do this in a single transaction, but that shouldn't be an issue.

I am just curios - did you tried dnf5 install dnf dnf5 --best. It should install dnf and upgrade dnf5.

[evan-goode]

Yes, I bumped the release versions just to make sure. Maybe I'm missing something.

Click to expand

evan@rawhide ~/git/dnf $ sudo dnf5 info dnf5 dnf

Updating and loading repositories:
Repositories loaded.
Installed packages
Name            : dnf5
Epoch           : 0
Version         : 5.1.0
Release         : 2.fc39
Architecture    : x86_64
Installed size  : 1.1 MiB
Source          : dnf5-5.1.0-2.fc39.src.rpm
From repository : rawhide
Summary         : Command-line package manager
URL             : https://github.com/rpm-software-management/dnf5
License         : GPL-2.0-or-later
Description     : DNF5 is a command-line package manager that automates the process of installing,
                : upgrading, configuring, and removing computer programs in a consistent manner.
                : It supports RPM packages, modulemd modules, and comps groups & environments.
Vendor          : Fedora Project

Available packages
Name            : dnf
Epoch           : 0
Version         : 4.16.2
Release         : 2.git.9573.78db5f1.fc39
Architecture    : noarch
Download size   : 463.0 KiB
Installed size  : 2.3 MiB
Source          : dnf-4.16.2-2.git.9573.78db5f1.fc39.src.rpm
Repository      : local-repo
Summary         : Package manager
URL             : https://github.com/rpm-software-management/dnf
License         : GPL-2.0-or-later AND GPL-1.0-only
Description     : Utility that allows users to manage packages on their systems.
                : It supports RPMs, modules and comps groups & environments.
Vendor          : 

Name            : dnf5
Epoch           : 0
Version         : 5.1.0
Release         : 2.fc39
Architecture    : i686
Download size   : 490.5 KiB
Installed size  : 1.2 MiB
Source          : dnf5-5.1.0-2.fc39.src.rpm
Repository      : rawhide
Summary         : Command-line package manager
URL             : https://github.com/rpm-software-management/dnf5
License         : GPL-2.0-or-later
Description     : DNF5 is a command-line package manager that automates the process of installing,
                : upgrading, configuring, and removing computer programs in a consistent manner.
                : It supports RPM packages, modulemd modules, and comps groups & environments.
Vendor          : Fedora Project

Name            : dnf5
Epoch           : 0
Version         : 5.1.0
Release         : 3.fc39
Architecture    : x86_64
Download size   : 444.7 KiB
Installed size  : 1.1 MiB
Source          : dnf5-5.1.0-3.fc39.src.rpm
Repository      : local-repo
Summary         : Command-line package manager
URL             : https://github.com/rpm-software-management/dnf5
License         : GPL-2.0-or-later
Description     : DNF5 is a command-line package manager that automates the process of installing,
                : upgrading, configuring, and removing computer programs in a consistent manner.
                : It supports RPM packages, modulemd modules, and comps groups & environments.
Vendor          : 

Then:

evan@rawhide ~/git/dnf $ sudo dnf5 install dnf5 dnf --setopt=allow_vendor_change=yes --best         
Updating and loading repositories:
Repositories loaded.
Failed to resolve the transaction:
Package "dnf5-5.1.0-2.fc39.x86_64" is already installed.
Problem: cannot install both dnf5-5.1.0-2.fc39.x86_64 and dnf5-5.1.0-3.fc39.x86_64
  - cannot install the best candidate for the job

Installing only DNF 5 works:

evan@rawhide ~/git/dnf $ sudo dnf5 install dnf5 --setopt=allow_vendor_change=yes --best 
Updating and loading repositories:
Repositories loaded.
Package "dnf5-5.1.0-2.fc39.x86_64" is already installed.

Package                                         Arch   Version                                         Repository                                              Size
Upgrading:                                                                                                                                                         
 dnf-data                                       noarch 4.16.2-2.git.9573.78db5f1.fc39                  local-repo                                          38.4 KiB
  replacing dnf-data                            noarch 4.16.2-1.fc39                                   copr:copr.fedorainfracloud.org:group_python:python  38.2 KiB
 dnf5                                           x86_64 5.1.0-3.fc39                                    local-repo                                           1.1 MiB
  replacing dnf5                                x86_64 5.1.0-2.fc39                                    rawhide                                              1.1 MiB
 dnf5-plugins                                   x86_64 5.1.0-3.fc39                                    local-repo                                         577.8 KiB
  replacing dnf5-plugins                        x86_64 5.1.0-2.fc39                                    rawhide                                            574.8 KiB
 libdnf5                                        x86_64 5.1.0-3.fc39                                    local-repo                                           2.5 MiB
  replacing libdnf5                             x86_64 5.1.0-2.fc39                                    rawhide                                              2.5 MiB
 libdnf5-cli                                    x86_64 5.1.0-3.fc39                                    local-repo                                         535.1 KiB
  replacing libdnf5-cli                         x86_64 5.1.0-2.fc39                                    rawhide                                            530.0 KiB
 python3-dnf                                    noarch 4.16.2-2.git.9573.78db5f1.fc39                  local-repo                                           2.6 MiB
   replacing python3-dnf                        noarch 4.16.2-1.fc39                                   copr:copr.fedorainfracloud.org:group_python:python   2.6 MiB

Transaction Summary:
 Upgrading:         6 packages
 Replacing:         6 packages

Total size of inbound packages is 2 MiB. Need to download 2 MiB.
After this operation 16 KiB will be used (install 7 MiB, remove 7 MiB).
Is this ok [y/N]: 

Remind me of the procedure to get debug output from the solver? I remember you or someone else on the team gave a presentation about it but I can't find the link any more.

[gotmax23]

Using >= comparisons (e.g. 0%{?fedora} >= 41 instead of 0%{?fedora} > 40 ) would make this more technically correct and comprehensible.

[inknos]

@gotmax23, sorry for not answering. I am merging the PR because we need this change to be in fedora before branching. I am about to make another specfile related PR with less urgent changes, and I will consider your suggestion.

[gotmax23]

Makes sense. Thanks @inknos.