$ git clone -n https://src.fedoraproject.org/rpms/ghc-reducers.git /var/lib/mock/f41-build-839912-160431/root/chroot_tmpdir/scmroot/ghc-reducers
Cloning into '/var/lib/mock/f41-build-839912-160431/root/chroot_tmpdir/scmroot/ghc-reducers'...
$ git reset --hard 8875eb6fe1382abba143ee73b71b903b03403277
HEAD is now at 8875eb6 refresh .cabal revision