$ git clone -n https://src.fedoraproject.org/rpms/ghc-distributive.git /var/lib/mock/f41-build-839560-160219/root/chroot_tmpdir/scmroot/ghc-distributive
Cloning into '/var/lib/mock/f41-build-839560-160219/root/chroot_tmpdir/scmroot/ghc-distributive'...
$ git fetch origin 71af66d7f227a56917955b8e10f0bd1d2823a9e2:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/ghc-distributive
 * [new ref]         71af66d7f227a56917955b8e10f0bd1d2823a9e2 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 71af66d bump release