$ git clone -n https://src.fedoraproject.org/rpms/fmt-ptrn.git /var/lib/mock/f45-build-9129-399/root/chroot_tmpdir/scmroot/fmt-ptrn
Cloning into '/var/lib/mock/f45-build-9129-399/root/chroot_tmpdir/scmroot/fmt-ptrn'...
$ git fetch origin 3bb9e5a6e4353e51270537b50e423fb656885b6f:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/fmt-ptrn
 * [new ref]         3bb9e5a6e4353e51270537b50e423fb656885b6f -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 3bb9e5a Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild