$ git clone -n https://src.fedoraproject.org/rpms/mate-calc.git /var/lib/mock/f45-build-18054-507/root/chroot_tmpdir/scmroot/mate-calc
Cloning into '/var/lib/mock/f45-build-18054-507/root/chroot_tmpdir/scmroot/mate-calc'...
$ git fetch origin a29410194e464e075235151e8a5d999abbbdbb1b:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/mate-calc
 * [new ref]         a29410194e464e075235151e8a5d999abbbdbb1b -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at a294101 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild