$ git clone -n https://src.fedoraproject.org/rpms/ghc-hostname.git /var/lib/mock/f31-build-54456-28006/root/chroot_tmpdir/scmroot/ghc-hostname
Cloning into '/var/lib/mock/f31-build-54456-28006/root/chroot_tmpdir/scmroot/ghc-hostname'...
$ git reset --hard 67b87aab7da3c9a239d4d4048be13c74c9b1db70
HEAD is now at 67b87aa refresh to cabal-rpm-0.13