$ git clone -n https://src.fedoraproject.org/rpms/grafx2.git /var/lib/mock/f40-build-797112-141065/root/chroot_tmpdir/scmroot/grafx2
Cloning into '/var/lib/mock/f40-build-797112-141065/root/chroot_tmpdir/scmroot/grafx2'...
$ git fetch origin ca66d4f4990d750963ba090b7f6363f6feb8b9f6:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/grafx2
 * [new ref]         ca66d4f4990d750963ba090b7f6363f6feb8b9f6 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at ca66d4f Rebuilt for https://fedoraproject.org/wiki/Fedora_40_Mass_Rebuild