$ git clone -n https://src.fedoraproject.org/rpms/ghc-http-streams.git /var/lib/mock/f40-build-744955-111932/root/chroot_tmpdir/scmroot/ghc-http-streams
Cloning into '/var/lib/mock/f40-build-744955-111932/root/chroot_tmpdir/scmroot/ghc-http-streams'...
$ git fetch origin d5e2d1004f36b9bca8aef30766d29bc2c4cad211:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/ghc-http-streams
 * [new ref]         d5e2d1004f36b9bca8aef30766d29bc2c4cad211 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at d5e2d10 https://hackage.haskell.org/package/http-streams-0.8.9.8/changelog