$ git clone -n https://src.fedoraproject.org/rpms/tcl-trf.git /var/lib/mock/f45-build-36849-708/root/chroot_tmpdir/scmroot/tcl-trf
Cloning into '/var/lib/mock/f45-build-36849-708/root/chroot_tmpdir/scmroot/tcl-trf'...
$ git fetch origin 74ba2955d70d0c09b31584b55988ad5856762641:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/tcl-trf
 * [new ref]         74ba2955d70d0c09b31584b55988ad5856762641 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 74ba295 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild