$ git clone -n https://src.fedoraproject.org/rpms/mtr.git /var/lib/mock/f40-build-2298832-56562/root/chroot_tmpdir/scmroot/mtr
Cloning into '/var/lib/mock/f40-build-2298832-56562/root/chroot_tmpdir/scmroot/mtr'...
$ git fetch origin 75ecf1919203b4b0e290e618ab9ad9bca143c650:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/mtr
 * [new ref]         75ecf1919203b4b0e290e618ab9ad9bca143c650 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 75ecf19 Rebuilt for https://fedoraproject.org/wiki/Fedora_40_Mass_Rebuild