$ git clone -n https://src.fedoraproject.org/rpms/ghc-simple-sendfile.git /var/lib/mock/f40-build-742452-110760/root/chroot_tmpdir/scmroot/ghc-simple-sendfile
Cloning into '/var/lib/mock/f40-build-742452-110760/root/chroot_tmpdir/scmroot/ghc-simple-sendfile'...
$ git fetch origin e4137e40ff60e01c163294fe9b97d83a7f525e03:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/ghc-simple-sendfile
 * [new ref]         e4137e40ff60e01c163294fe9b97d83a7f525e03 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at e4137e4 https://hackage.haskell.org/package/simple-sendfile-0.2.32/changelog