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I prepared support for "--disableplugin=", "--enableplugin=", and "--noplugins" arguments into microdnf.
PR https://github.com/rpm-software-management/microdnf/pull/63

It also needs support in libdnf:
PR https://github.com/rpm-software-management/libdnf/pull/861

With the patches "subscription checking" can be disabled by "--disableplugin=subscription-manager" or "--noplugins".

PR were merged with upstream.
https://github.com/rpm-software-management/libdnf/pull/861
https://github.com/rpm-software-management/microdnf/pull/63
https://github.com/rpm-software-management/microdnf/pull/72

With the patches microdnf works similar as DNF.
The "subscription checking" can be disabled by command line argument "--disableplugin=subscription-manager".
Loading of all plugins can be disabled by command line argument "--noplugins" or in the configuration file (by default /etc/dnf/dnf.conf) by setting option "plugins=0".

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 (microdnf 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-2020:4507