$ git clone -n https://src.fedoraproject.org/rpms/ghc-ieee754.git /var/lib/mock/f40-build-742191-110610/root/chroot_tmpdir/scmroot/ghc-ieee754
Cloning into '/var/lib/mock/f40-build-742191-110610/root/chroot_tmpdir/scmroot/ghc-ieee754'...
$ git fetch origin df0827551c10c103f09d0833d509947d81cab4ff:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/ghc-ieee754
 * [new ref]         df0827551c10c103f09d0833d509947d81cab4ff -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at df08275 bump release