$ git clone -n https://src.fedoraproject.org/rpms/arianna.git /var/lib/mock/f42-build-864354-172289/root/chroot_tmpdir/scmroot/arianna
Cloning into '/var/lib/mock/f42-build-864354-172289/root/chroot_tmpdir/scmroot/arianna'...
$ git fetch origin a3f50f5fe293996d88928451589454ba96bccf90:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/arianna
 * [new ref]         a3f50f5fe293996d88928451589454ba96bccf90 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at a3f50f5 24.12.0