$ git clone -n https://src.fedoraproject.org/rpms/uboot-tools.git /var/lib/mock/f42-build-3457985-45512/root/chroot_tmpdir/scmroot/uboot-tools
Cloning into '/var/lib/mock/f42-build-3457985-45512/root/chroot_tmpdir/scmroot/uboot-tools'...
$ git fetch origin 9de9b912a1d8d90b67caaf2d58805b9c21ad6c37:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/uboot-tools
 * [new ref]         9de9b912a1d8d90b67caaf2d58805b9c21ad6c37 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 9de9b91 Add back openssl-devel-engine which was dropped by accident from an experiment