$ git clone -n https://src.fedoraproject.org/rpms/gamemode.git /var/lib/mock/f45-build-9409-403/root/chroot_tmpdir/scmroot/gamemode
Cloning into '/var/lib/mock/f45-build-9409-403/root/chroot_tmpdir/scmroot/gamemode'...
$ git fetch origin 5e85b92a85978bc29b01a42a74221e9569f96612:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/gamemode
 * [new ref]         5e85b92a85978bc29b01a42a74221e9569f96612 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 5e85b92 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild