$ git clone -n https://src.fedoraproject.org/rpms/dhall.git /var/lib/mock/f41-build-2628694-25583/root/chroot_tmpdir/scmroot/dhall
Cloning into '/var/lib/mock/f41-build-2628694-25583/root/chroot_tmpdir/scmroot/dhall'...
$ git fetch origin ff2b896e476643e90d225d8d0d7993b019b17649:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/dhall
 * [new ref]         ff2b896e476643e90d225d8d0d7993b019b17649 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at ff2b896 https://hackage.haskell.org/package/dhall-1.42.1/changelog