$ git clone -n https://src.fedoraproject.org/rpms/perl-Math-Random-ISAAC.git /var/lib/mock/f45-build-24712-605/root/chroot_tmpdir/scmroot/perl-Math-Random-ISAAC
Cloning into '/var/lib/mock/f45-build-24712-605/root/chroot_tmpdir/scmroot/perl-Math-Random-ISAAC'...
$ git fetch origin 383571731e8e12b1b745545df42a3933b04a70a6:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/perl-Math-Random-ISAAC
 * [new ref]         383571731e8e12b1b745545df42a3933b04a70a6 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 3835717 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild