Description of problem:

Because chkconfig is not installed by default any more in RHEL9, we are seeing issues when it's installed afterwards, when a 3rd party tool is already installed and created /etc/init.d directory, instead of the link to /etc/rc.d/init.d

Because chkconfig is not able to decide what to do with this directory, the request here is to print a warning during the installation instead just a fail or pyton backtrace.
Thus user can identify and fix the issue.

Version-Release number of selected component (if applicable):
chkconfig-1.20-2.el9.x86_64
RHEL9

How reproducible:
always

Steps to Reproduce:
1. simulate a faulty install of an init script in /etc/init.d: mkdir /etc/inid.d
2. yum install chkconfig
3.

Actual results:
Non understandable Error:

—
Installing:
chkconfig x86_64 1.20-2.el9
...
Running transaction check
Transaction check succeeded.
Running transaction test
Transaction test succeeded.
Running transaction
Preparing : 1/1
Installing : chkconfig-1.20-2.el9.x86_64 1/1
Error unpacking rpm package chkconfig-1.20-2.el9.x86_64
Errors occurred during transaction.
Verifying : chkconfig-1.20-2.el9.x86_64 1/1
Completion plugin: Generating completion cache...
Installed products updated.
User-Agent: constructed: 'libdnf (Red Hat Enterprise Linux 9.0; generic; Linux.x86_64)'
...
rhel-9-for-x86_64-sap-netweaver-e4s-rpms: using metadata from Thu 19 May 2022 02:39:34 PM CEST.
Last metadata expiration check: 0:00:01 ago on Mon 29 Aug 2022 12:03:01 PM CEST.
Failed: chkconfig-1.20-2.el9.x86_64

Failed:
chkconfig-1.20-2.el9.x86_64

Error: Transaction failed
—

Expected results:

• An explicit warning from the preinstall script:

"The /etc/init.d directory already exists, please check the content and remove it as it is in conflict with chkconfig"

Of course, the real fix must done in the broken script, but a warning will help customer to identify the issue.

Additional info:
With detail output, we can identify the issue, but in a lot of data:
~~~
D: create 040755 1 ( 0, 0) 0 /etc/chkconfig.d
D: Plugin: calling hook fsm_file_prepare in selinux plugin
D: create 120777 1 ( 0, 0) 11 /etc/init.d;630dcf56
D: Plugin: calling hook fsm_file_prepare in selinux plugin
fdio: 8 reads, 263 total bytes in 0.000847 secs
error: unpacking of archive failed on file /etc/init.d: cpio: File from package already exists as a directory in system
~~~