$ git clone -n https://src.fedoraproject.org/rpms/R-RMariaDB.git /var/lib/mock/f41-build-side-1-3142779-40009/root/chroot_tmpdir/scmroot/R-RMariaDB
Cloning into '/var/lib/mock/f41-build-side-1-3142779-40009/root/chroot_tmpdir/scmroot/R-RMariaDB'...
$ git fetch origin 5f26e532675935481bdf6a2d4d1e31c9baaf293d:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/R-RMariaDB
 * [new ref]         5f26e532675935481bdf6a2d4d1e31c9baaf293d -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 5f26e53 convert GPLv3 license to SPDX