Description of problem:

When modifying the hostname through using the initial-setup GUI or Text interface, upon exiting the tool, the hostname is not used on the system, as shown in the example below, consisting in renaming "vm-gui83" into "vm-gui83-renamed":

1. Before renaming

1. hostnamectl | grep "vm-gui83"; cat /etc/hostname /proc/sys/kernel/hostname
   Static hostname: vm-gui83
   vm-gui83
   vm-gui83

2. After renaming and clicking on "Apply" (GUI only)

1. hostnamectl | grep "vm-gui83"; cat /etc/hostname /proc/sys/kernel/hostname
   Static hostname: vm-gui83
   Transient hostname: vm-gui83-renamed
   vm-gui83
   vm-gui83

3. After exiting the configuration tool

1. hostnamectl | grep "vm-gui83"; cat /etc/hostname /proc/sys/kernel/hostname
   Static hostname: vm-gui83
   Transient hostname: vm-gui83-renamed
   vm-gui83
   vm-gui83

--> hostname not applied

In fact, in order for the hostname to apply really (reflecting in /proc/sys/kernel/hostname), it is necessary to wait for systemd-hostnamed service to exit, then issue a "hostnamectl" command. The systemd-hostnamed service will then discover that /etc/hostname (set by initial-setup) is different than current hostname (old not renamed "vm-gui83") and apply the modification.

The bug here is that initial-setup should modify the Static hostname upon finishing the configuration, not the Transient hostname.

4. After systemd-hostnamed exited and a "hostnamectl" was issue again

1. hostnamectl | grep "vm-gui83"; cat /etc/hostname /proc/sys/kernel/hostname
   Static hostname: vm-gui83-renamed
   vm-gui83-renamed
   vm-gui83-renamed

--> hostname finally applied

Version-Release number of selected component (if applicable):

initial-setup-0.3.81.6-1.el8.x86_64

How reproducible:

Always, see procedure above.
To start the initial-setup on boot, just enable "initial-setup-reconfiguration.service", "touch /.unconfigured" and reboot