$ git clone -n https://src.fedoraproject.org/rpms/mb2md.git /var/lib/mock/f40-build-2297068-56437/root/chroot_tmpdir/scmroot/mb2md
Cloning into '/var/lib/mock/f40-build-2297068-56437/root/chroot_tmpdir/scmroot/mb2md'...
$ git fetch origin 4f1e57b95e3e8f87725642c26cddf0f82e1a1568:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/mb2md
 * [new ref]         4f1e57b95e3e8f87725642c26cddf0f82e1a1568 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 4f1e57b Rebuilt for https://fedoraproject.org/wiki/Fedora_40_Mass_Rebuild