$ git clone -n https://src.fedoraproject.org/rpms/tremulous.git /var/lib/mock/f41-build-3155976-40677/root/chroot_tmpdir/scmroot/tremulous
Cloning into '/var/lib/mock/f41-build-3155976-40677/root/chroot_tmpdir/scmroot/tremulous'...
$ git fetch origin b5f05614b062e1ca431765864904aec1994c384d:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/tremulous
 * [new ref]         b5f05614b062e1ca431765864904aec1994c384d -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at b5f0561 convert GPLv2+ license to SPDX