$ git clone -n https://src.fedoraproject.org/rpms/R-procmaps.git /var/lib/mock/f38-build-720931-97963/root/chroot_tmpdir/scmroot/R-procmaps
Cloning into '/var/lib/mock/f38-build-720931-97963/root/chroot_tmpdir/scmroot/R-procmaps'...
$ git fetch origin 8b45aa7649e6f3ffc6553fa32128427aeec7c3f3:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/R-procmaps
 * [new ref]         8b45aa7649e6f3ffc6553fa32128427aeec7c3f3 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 8b45aa7 R-maint-sig mass rebuild