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Description of problem:
Running "localectl set-locale aaa" on RHEL 8 succeeds and does not issue an error or warning message.

Version-Release number of selected component (if applicable):
RHEL 8.0 GA

How reproducible:
always

Steps to Reproduce:
1. Execute:
# localectl set-locale aaa
2. Run:
# echo $?

Actual results:
a) There is no warning or error message.
b) The return code is 0:
0

Expected results:
The behavior should be identical to RHEL 7.6:
a) There should be an error message like:
Failed to issue method call: Invalid Locale data.
b) The return code should be 1:
1

Additional info:

localectl comes from systemd:

$ rpm -qf /usr/bin/localectl 
systemd-239-13.el8_0.5.x86_64

I think systemd should be able to check the availability of a locale using the setlocale function, so I don't think we need any glibc changes to enable this feature.

(In reply to Bernd Finger from comment #0)
> Expected results:
> The behavior should be identical to RHEL 7.6:
> a) There should be an error message like:
> Failed to issue method call: Invalid Locale data.

Well, the RHEL-7.6 version does not check the input either. It just fails if you don't provide the variable that you want to set too.

# localectl set-locale foobar
Failed to issue method call: Invalid Locale data.

# localectl set-locale LANG=foobar
# echo $?
0

The upstream version (673d873a42fd6e7821e310cfb81bc37d092c4a22) doesn't sanity-check the input as well.

https://github.com/systemd/systemd/pull/13964

fix merged to github master branch -> https://github.com/systemd-rhel/rhel-8/pull/132

Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.

For information on the advisory (Moderate: systemd security, bug fix, and enhancement update), and where to find the updated
files, follow the link below.

If the solution does not work for you, open a new bug report.

https://access.redhat.com/errata/RHSA-2021:1611