$ git clone -n https://src.fedoraproject.org/rpms/ghc-vector-binary-instances.git /var/lib/mock/f45-build-10946-425/root/chroot_tmpdir/scmroot/ghc-vector-binary-instances
Cloning into '/var/lib/mock/f45-build-10946-425/root/chroot_tmpdir/scmroot/ghc-vector-binary-instances'...
$ git fetch origin f37c1f42ee9ee9af8e53ae6617433fe40277c9ae:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/ghc-vector-binary-instances
 * [new ref]         f37c1f42ee9ee9af8e53ae6617433fe40277c9ae -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at f37c1f4 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild