$ git clone -n https://src.fedoraproject.org/rpms/lua-cassowary.git /var/lib/mock/f45-build-17608-501/root/chroot_tmpdir/scmroot/lua-cassowary
Cloning into '/var/lib/mock/f45-build-17608-501/root/chroot_tmpdir/scmroot/lua-cassowary'...
$ git fetch origin 9d940914e2bea5680e95ffaadfa7e9f29b8d7007:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/lua-cassowary
 * [new ref]         9d940914e2bea5680e95ffaadfa7e9f29b8d7007 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 9d94091 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild