$ git clone -n https://src.fedoraproject.org/rpms/ghc-gi-gdk.git /var/lib/mock/f40-build-796263-140592/root/chroot_tmpdir/scmroot/ghc-gi-gdk
Cloning into '/var/lib/mock/f40-build-796263-140592/root/chroot_tmpdir/scmroot/ghc-gi-gdk'...
$ git fetch origin b92f33519afb78cd37297df032e1f515ce6cdef3:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/ghc-gi-gdk
 * [new ref]         b92f33519afb78cd37297df032e1f515ce6cdef3 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at b92f335 https://hackage.haskell.org/package/gi-gdk-3.0.28/changelog