$ git clone -n https://src.fedoraproject.org/rpms/R-DBI.git /var/lib/mock/f43-build-side-110352-58905189-6569147/root/chroot_tmpdir/scmroot/R-DBI
Cloning into '/var/lib/mock/f43-build-side-110352-58905189-6569147/root/chroot_tmpdir/scmroot/R-DBI'...
$ git fetch origin d9914b42f13ae06e99617c366e1b4d08a3dabb27:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/R-DBI
 * [new ref]         d9914b42f13ae06e99617c366e1b4d08a3dabb27 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at d9914b4 R-maint-sig mass rebuild