$ git clone -n https://src.fedoraproject.org/rpms/ghc-vector-th-unbox.git /var/lib/mock/f45-build-10943-425/root/chroot_tmpdir/scmroot/ghc-vector-th-unbox
Cloning into '/var/lib/mock/f45-build-10943-425/root/chroot_tmpdir/scmroot/ghc-vector-th-unbox'...
$ git fetch origin 4a0865f95c0498fa2cb372640bc662fc7ff6a78a:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/ghc-vector-th-unbox
 * [new ref]         4a0865f95c0498fa2cb372640bc662fc7ff6a78a -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 4a0865f Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild