$ git clone -n https://src.fedoraproject.org/rpms/ghc-yesod-core.git /var/lib/mock/f31-build-55099-28089/root/chroot_tmpdir/scmroot/ghc-yesod-core
Cloning into '/var/lib/mock/f31-build-55099-28089/root/chroot_tmpdir/scmroot/ghc-yesod-core'...
$ git reset --hard 10ff3555daa849243aba0e46a9092a93e3b5ae22
HEAD is now at 10ff355 update to 1.6.9