$ git clone -n https://src.fedoraproject.org/rpms/mingw-mpfr.git /var/lib/mock/f45-build-18597-523/root/chroot_tmpdir/scmroot/mingw-mpfr
Cloning into '/var/lib/mock/f45-build-18597-523/root/chroot_tmpdir/scmroot/mingw-mpfr'...
$ git fetch origin cdf09bc9412d483e1e49c9e8c890bb45916979e1:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/mingw-mpfr
 * [new ref]         cdf09bc9412d483e1e49c9e8c890bb45916979e1 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at cdf09bc Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild