$ git clone -n https://src.fedoraproject.org/rpms/ghc-yesod-core.git /var/lib/mock/f31-build-101601-33417/root/chroot_tmpdir/scmroot/ghc-yesod-core
Cloning into '/var/lib/mock/f31-build-101601-33417/root/chroot_tmpdir/scmroot/ghc-yesod-core'...
$ git reset --hard 09afca020241a3b96f50bce87bf3ccb9b1a57cd3
HEAD is now at 09afca0 microlens prof