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dnf config-manager prints nothing and exits with 0.
YUM3 used to perform the --dump action in this case.
We have decided not to bring the previous behavior back in bug#1706384.


Expected behavior / Acceptance criteria:
$ dnf config-manager
error is printed (user is suggested to specify an option) and dnf exits with non-zero code (probably 2)


It might be doable by grouping the action options (--save, ---add-repo, -dump, --dump-variables) and changing the option parser that it would require specifying one of them.

PR: https://github.com/rpm-software-management/dnf-plugins-core/pull/381
TEST: https://github.com/rpm-software-management/ci-dnf-stack/pull/776

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 (yum 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/RHEA-2020:4510