$ git clone -n https://src.fedoraproject.org/rpms/velocity.git /var/lib/mock/f39-build-1506294-35180/root/chroot_tmpdir/scmroot/velocity
Cloning into '/var/lib/mock/f39-build-1506294-35180/root/chroot_tmpdir/scmroot/velocity'...
$ git fetch origin ead1a5010763a64b6319bb3035e644fe7c0b6f4e:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/velocity
 * [new ref]         ead1a5010763a64b6319bb3035e644fe7c0b6f4e -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at ead1a50 Rebuilt for https://fedoraproject.org/wiki/Fedora_39_Mass_Rebuild