$ git clone -n https://src.fedoraproject.org/rpms/g3kb-switch.git /var/lib/mock/f45-build-9390-403/root/chroot_tmpdir/scmroot/g3kb-switch
Cloning into '/var/lib/mock/f45-build-9390-403/root/chroot_tmpdir/scmroot/g3kb-switch'...
$ git fetch origin 200f80d56fc56e3b6ffb2cbd5e9e67158823996d:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/g3kb-switch
 * [new ref]         200f80d56fc56e3b6ffb2cbd5e9e67158823996d -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 200f80d Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild