$ git clone -n https://src.fedoraproject.org/rpms/R-RMariaDB.git /var/lib/mock/f38-build-725163-99560/root/chroot_tmpdir/scmroot/R-RMariaDB
Cloning into '/var/lib/mock/f38-build-725163-99560/root/chroot_tmpdir/scmroot/R-RMariaDB'...
$ git fetch origin 9eab6047ae27d3e019b0288fdd0133522f1a65ef:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/R-RMariaDB
 * [new ref]         9eab6047ae27d3e019b0288fdd0133522f1a65ef -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 9eab604 R-maint-sig mass rebuild