$ git clone -n https://src.fedoraproject.org/rpms/ghc-hashable.git /var/lib/mock/f38-build-side-42-init-devel-745090-27658/root/chroot_tmpdir/scmroot/ghc-hashable
Cloning into '/var/lib/mock/f38-build-side-42-init-devel-745090-27658/root/chroot_tmpdir/scmroot/ghc-hashable'...
$ git fetch origin 3a1f76da7bb6d1f3cd58650c2e90d9a17d60cb79:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/ghc-hashable
 * [new ref]         3a1f76da7bb6d1f3cd58650c2e90d9a17d60cb79 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 3a1f76d update to 1.4.2.0