$ git clone -n https://src.fedoraproject.org/rpms/ghc-bloomfilter.git /var/lib/mock/f41-build-835773-158635/root/chroot_tmpdir/scmroot/ghc-bloomfilter
Cloning into '/var/lib/mock/f41-build-835773-158635/root/chroot_tmpdir/scmroot/ghc-bloomfilter'...
$ git fetch origin cea41c3bdf9a938b99da02e15145d2e4784a8fb8:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/ghc-bloomfilter
 * [new ref]         cea41c3bdf9a938b99da02e15145d2e4784a8fb8 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at cea41c3 https://hackage.haskell.org/package/bloomfilter-2.0.1.2/changelog