$ git clone -n https://src.fedoraproject.org/rpms/mtxclient.git /var/lib/mock/f40-build-796661-140775/root/chroot_tmpdir/scmroot/mtxclient
Cloning into '/var/lib/mock/f40-build-796661-140775/root/chroot_tmpdir/scmroot/mtxclient'...
$ git fetch origin c8431fe148d46ba4e033fa12bffd1dd1669b1b01:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/mtxclient
 * [new ref]         c8431fe148d46ba4e033fa12bffd1dd1669b1b01 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at c8431fe Rebuilt for https://fedoraproject.org/wiki/Fedora_40_Mass_Rebuild