$ git clone -n https://src.fedoraproject.org/rpms/rpc2.git /var/lib/mock/f40-build-800210-142882/root/chroot_tmpdir/scmroot/rpc2
Cloning into '/var/lib/mock/f40-build-800210-142882/root/chroot_tmpdir/scmroot/rpc2'...
$ git fetch origin 4fb891a4db341aba25f94ddaa703baa756f0f9f4:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/rpc2
 * [new ref]         4fb891a4db341aba25f94ddaa703baa756f0f9f4 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 4fb891a Rebuilt for https://fedoraproject.org/wiki/Fedora_40_Mass_Rebuild