$ git clone -n https://src.fedoraproject.org/rpms/perl-Class-Virtual.git /var/lib/mock/f45-build-22382-591/root/chroot_tmpdir/scmroot/perl-Class-Virtual
Cloning into '/var/lib/mock/f45-build-22382-591/root/chroot_tmpdir/scmroot/perl-Class-Virtual'...
$ git fetch origin 90e6c979b5285d33c728b7fd527ad5a9ab1196d3:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/perl-Class-Virtual
 * [new ref]         90e6c979b5285d33c728b7fd527ad5a9ab1196d3 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 90e6c97 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild