$ git clone -n https://src.fedoraproject.org/rpms/ghc-parsec-numbers.git /var/lib/mock/f41-build-837765-159384/root/chroot_tmpdir/scmroot/ghc-parsec-numbers
Cloning into '/var/lib/mock/f41-build-837765-159384/root/chroot_tmpdir/scmroot/ghc-parsec-numbers'...
$ git fetch origin b7f945a38b1ac8527844b9bf142f08dbc45ac57e:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/ghc-parsec-numbers
 * [new ref]         b7f945a38b1ac8527844b9bf142f08dbc45ac57e -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at b7f945a bump release