$ git clone -n https://src.fedoraproject.org/rpms/ghc-cereal.git /var/lib/mock/f31-build-54123-27957/root/chroot_tmpdir/scmroot/ghc-cereal
Cloning into '/var/lib/mock/f31-build-54123-27957/root/chroot_tmpdir/scmroot/ghc-cereal'...
$ git reset --hard 71914c291b982f51aec237c57a6a7ddeea992111
HEAD is now at 71914c2 update to 0.5.7.0