$ git clone -n https://src.fedoraproject.org/rpms/perl-Math-Cartesian-Product.git /var/lib/mock/f40-build-2626592-65287/root/chroot_tmpdir/scmroot/perl-Math-Cartesian-Product
Cloning into '/var/lib/mock/f40-build-2626592-65287/root/chroot_tmpdir/scmroot/perl-Math-Cartesian-Product'...
$ git fetch origin 888df1b5eed1980d2c2dffe0a850c7fe41ec7d8a:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/perl-Math-Cartesian-Product
 * [new ref]         888df1b5eed1980d2c2dffe0a850c7fe41ec7d8a -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 888df1b Rebuilt for https://fedoraproject.org/wiki/Fedora_40_Mass_Rebuild