$ git clone -n https://src.fedoraproject.org/rpms/perl-Math-VectorReal.git /var/lib/mock/f45-build-24791-606/root/chroot_tmpdir/scmroot/perl-Math-VectorReal
Cloning into '/var/lib/mock/f45-build-24791-606/root/chroot_tmpdir/scmroot/perl-Math-VectorReal'...
$ git fetch origin 7e636558ca45572843220e3fa2cb395fd6323f1f:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/perl-Math-VectorReal
 * [new ref]         7e636558ca45572843220e3fa2cb395fd6323f1f -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 7e63655 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild