$ git clone -n https://src.fedoraproject.org/rpms/ghc-sendfile.git /var/lib/mock/f31-build-54807-28063/root/chroot_tmpdir/scmroot/ghc-sendfile
Cloning into '/var/lib/mock/f31-build-54807-28063/root/chroot_tmpdir/scmroot/ghc-sendfile'...
$ git reset --hard f305972497fea450d7933948a6a01aeb5fb51e89
HEAD is now at f305972 refresh to cabal-rpm-0.13