$ git clone -n https://src.fedoraproject.org/rpms/memtest86+.git /var/lib/mock/f38-build-718646-96745/root/chroot_tmpdir/scmroot/memtest86+
Cloning into '/var/lib/mock/f38-build-718646-96745/root/chroot_tmpdir/scmroot/memtest86+'...
$ git fetch origin fff8f91c11f2d0676a7a5a9b149d2aecb6c76389:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/memtest86+
 * [new ref]         fff8f91c11f2d0676a7a5a9b149d2aecb6c76389 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at fff8f91 Rebuilt for https://fedoraproject.org/wiki/Fedora_38_Mass_Rebuild