$ git clone -n https://src.fedoraproject.org/rpms/perl-Test-CPAN-Meta-JSON.git /var/lib/mock/f40-build-2021269-46702/root/chroot_tmpdir/scmroot/perl-Test-CPAN-Meta-JSON
Cloning into '/var/lib/mock/f40-build-2021269-46702/root/chroot_tmpdir/scmroot/perl-Test-CPAN-Meta-JSON'...
$ git fetch origin 521aa8a4e646123eba3159aaacf46dc09e14c686:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/perl-Test-CPAN-Meta-JSON
 * [new ref]         521aa8a4e646123eba3159aaacf46dc09e14c686 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 521aa8a Rebuilt for https://fedoraproject.org/wiki/Fedora_39_Mass_Rebuild