$ git clone -n https://src.fedoraproject.org/rpms/plexus-containers.git /var/lib/mock/f40-build-1966296-25208/root/chroot_tmpdir/scmroot/plexus-containers
Cloning into '/var/lib/mock/f40-build-1966296-25208/root/chroot_tmpdir/scmroot/plexus-containers'...
$ git fetch origin 2984df38eadbe184c82c8e1764b6cd82595b4c9a:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/plexus-containers
 * [new ref]         2984df38eadbe184c82c8e1764b6cd82595b4c9a -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 2984df3 Rebuilt for java-21-openjdk as system jdk