$ git clone -n https://src.fedoraproject.org/rpms/tor.git /var/lib/mock/f40-build-1943473-25169/root/chroot_tmpdir/scmroot/tor
Cloning into '/var/lib/mock/f40-build-1943473-25169/root/chroot_tmpdir/scmroot/tor'...
$ git fetch origin d480be80448e101bf5a8468c0c65ca213a654285:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/tor
 * [new ref]         d480be80448e101bf5a8468c0c65ca213a654285 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at d480be8 Re-add systemd-devel as build dependency - fixes bz#2302910