[Rpm-maint] [rpm-software-management/rpm] Host specific %_install_langs affects --root <customdir> installation (Issue #2623)

[Pavel Raiskup]

When we talk about configuration, what's meant by that?  All macro definitions?  Because there seems to be an issue with `/etc/rpm/macros.image-language-conf` like things.

As you asked for ideas; I think there's a space for a low-level, distro-specific, rpm-sub-package that would install the distro-specific configuration.  If there was such an RPM, Mock could just simply tell DNF to ignore the host's configuration at the beginning (split the preparation into two steps):

    $ rootdir=$(mktemp -d)
    dnf5 --installroot "$rootdir" install rpm-config --use-host-config
    dnf5 --installroot "$rootdir" install @buildsys-build

The first transaction needs to be as small as possible.  Small enough to
let distro-maintainers cure the target distribution so the transaction
**isn't affected** by the **host** configuration at all.  The second
transaction, since the config is already **in chroot**, can ignore the
host configuration entirely.

Seems like the set of packages in the first transaction in Fedora
is currently pretty small:

```
$ sudo dnf5 --installroot "$rootdir" install setup --use-host-config
Updating and loading repositories:
Repositories loaded.
Package                        Arch     Version       Repository      Size
Installing:
 setup                         noarch   2.14.4-1.fc39 fedora     720.3 KiB
Installing dependencies:
 fedora-gpg-keys               noarch   39-1          fedora     123.2 KiB
 fedora-release                noarch   39-30         fedora       0.0   B
 fedora-release-common         noarch   39-30         fedora      17.7 KiB
 fedora-release-identity-basic noarch   39-30         fedora     666.0   B
 fedora-repos                  noarch   39-1          fedora       4.5 KiB
 filesystem                    x86_64   3.18-6.fc39   fedora     106.0   B

Transaction Summary:
 Installing:        7 packages

Total size of inbound packages is 1 MiB. Need to download 1 MiB.
After this operation 867 KiB will be used (install 867 KiB, remove 0 B).
Is this ok [y/N]:
```

Not sure if one of those could be recycled for this purpose, instead of
creating a new `rpm-config` package?


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