$ git clone -n https://src.fedoraproject.org/rpms/ghc-numbers.git /var/lib/mock/f45-build-10607-419/root/chroot_tmpdir/scmroot/ghc-numbers
Cloning into '/var/lib/mock/f45-build-10607-419/root/chroot_tmpdir/scmroot/ghc-numbers'...
$ git fetch origin b929415691740dc4074b3961e98e0d78a36cb36b:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/ghc-numbers
 * [new ref]         b929415691740dc4074b3961e98e0d78a36cb36b -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at b929415 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild