$ git clone -n https://src.fedoraproject.org/rpms/primesieve.git /var/lib/mock/f40-build-795100-139926/root/chroot_tmpdir/scmroot/primesieve
Cloning into '/var/lib/mock/f40-build-795100-139926/root/chroot_tmpdir/scmroot/primesieve'...
$ git fetch origin bd3b77bff1738b3744542f50aed5297eb63d1616:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/primesieve
 * [new ref]         bd3b77bff1738b3744542f50aed5297eb63d1616 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at bd3b77b Rebuilt for https://fedoraproject.org/wiki/Fedora_40_Mass_Rebuild