$ git clone -n https://src.fedoraproject.org/rpms/perl-Cache.git /var/lib/mock/f45-build-22095-589/root/chroot_tmpdir/scmroot/perl-Cache
Cloning into '/var/lib/mock/f45-build-22095-589/root/chroot_tmpdir/scmroot/perl-Cache'...
$ git fetch origin eb737ce92d2cfc16176f0c9039f1c2efe0b17e99:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/perl-Cache
 * [new ref]         eb737ce92d2cfc16176f0c9039f1c2efe0b17e99 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at eb737ce Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild