$ git clone -n https://src.fedoraproject.org/rpms/ghc-data-default-instances-containers.git /var/lib/mock/f41-build-837899-159471/root/chroot_tmpdir/scmroot/ghc-data-default-instances-containers
Cloning into '/var/lib/mock/f41-build-837899-159471/root/chroot_tmpdir/scmroot/ghc-data-default-instances-containers'...
$ git fetch origin 2a5ed34bc517c44d9fabba3c51d0c70541da6853:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/ghc-data-default-instances-containers
 * [new ref]         2a5ed34bc517c44d9fabba3c51d0c70541da6853 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 2a5ed34 bump release