$ git clone -n https://src.fedoraproject.org/rpms/gkrellm-wifi.git /var/lib/mock/f45-build-11138-427/root/chroot_tmpdir/scmroot/gkrellm-wifi
Cloning into '/var/lib/mock/f45-build-11138-427/root/chroot_tmpdir/scmroot/gkrellm-wifi'...
$ git fetch origin f9ffc87407ebb1cfe50847d68a9c1c44d86f4856:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/gkrellm-wifi
 * [new ref]         f9ffc87407ebb1cfe50847d68a9c1c44d86f4856 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at f9ffc87 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild