$ git clone -n https://src.fedoraproject.org/rpms/perl-Tie-Cache.git /var/lib/mock/f45-build-27146-621/root/chroot_tmpdir/scmroot/perl-Tie-Cache
Cloning into '/var/lib/mock/f45-build-27146-621/root/chroot_tmpdir/scmroot/perl-Tie-Cache'...
$ git fetch origin 86e4a157f967ce5a9747739d2afcdc5b7eebbaf8:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/perl-Tie-Cache
 * [new ref]         86e4a157f967ce5a9747739d2afcdc5b7eebbaf8 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 86e4a15 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild