$ git clone -n https://src.fedoraproject.org/rpms/ghc-streaming-commons.git /var/lib/mock/f40-build-743918-111445/root/chroot_tmpdir/scmroot/ghc-streaming-commons
Cloning into '/var/lib/mock/f40-build-743918-111445/root/chroot_tmpdir/scmroot/ghc-streaming-commons'...
$ git fetch origin 6b0b67fa6a5cd79ea67d9612d4356333638cae7a:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/ghc-streaming-commons
 * [new ref]         6b0b67fa6a5cd79ea67d9612d4356333638cae7a -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 6b0b67f https://hackage.haskell.org/package/streaming-commons-0.2.2.6/changelog