$ git clone -n https://src.fedoraproject.org/rpms/haruna.git /var/lib/mock/f40-build-2363447-60368/root/chroot_tmpdir/scmroot/haruna
Cloning into '/var/lib/mock/f40-build-2363447-60368/root/chroot_tmpdir/scmroot/haruna'...
$ git fetch origin c141360374857eae35af64ad6dad4a9519718560:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/haruna
 * [new ref]         c141360374857eae35af64ad6dad4a9519718560 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at c141360 rebuild