$ git clone -n https://src.fedoraproject.org/rpms/perl-Cache-Cache.git /var/lib/mock/f45-build-22098-589/root/chroot_tmpdir/scmroot/perl-Cache-Cache
Cloning into '/var/lib/mock/f45-build-22098-589/root/chroot_tmpdir/scmroot/perl-Cache-Cache'...
$ git fetch origin 20ab9842dbd11eb509972ca967c15be771596473:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/perl-Cache-Cache
 * [new ref]         20ab9842dbd11eb509972ca967c15be771596473 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 20ab984 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild