$ git clone -n https://src.fedoraproject.org/rpms/ghc-vector.git /var/lib/mock/f40-build-742714-110881/root/chroot_tmpdir/scmroot/ghc-vector
Cloning into '/var/lib/mock/f40-build-742714-110881/root/chroot_tmpdir/scmroot/ghc-vector'...
$ git fetch origin 96a88934f8597c9ec3754481a849f65f8043cb80:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/ghc-vector
 * [new ref]         96a88934f8597c9ec3754481a849f65f8043cb80 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 96a8893 update to 0.13.0.0