$ git clone -n https://src.fedoraproject.org/rpms/haruna.git /var/lib/mock/f40-build-768577-125350/root/chroot_tmpdir/scmroot/haruna
Cloning into '/var/lib/mock/f40-build-768577-125350/root/chroot_tmpdir/scmroot/haruna'...
$ git fetch origin 17d72c5a0d7ff699de95797356463905fbc569e9:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/haruna
 * [new ref]         17d72c5a0d7ff699de95797356463905fbc569e9 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 17d72c5 rebuild