$ git clone -n https://src.fedoraproject.org/rpms/plexus-containers.git /var/lib/mock/f42-build-3403682-45135/root/chroot_tmpdir/scmroot/plexus-containers
Cloning into '/var/lib/mock/f42-build-3403682-45135/root/chroot_tmpdir/scmroot/plexus-containers'...
$ git fetch origin 76c361c64998ae5d2e2df0db2cc621e5a55b966f:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/plexus-containers
 * [new ref]         76c361c64998ae5d2e2df0db2cc621e5a55b966f -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 76c361c Remove javadoc subpackage