$ git clone -n https://src.fedoraproject.org/rpms/perl-CPAN.git /var/lib/mock/f39-build-1433896-31897/root/chroot_tmpdir/scmroot/perl-CPAN
Cloning into '/var/lib/mock/f39-build-1433896-31897/root/chroot_tmpdir/scmroot/perl-CPAN'...
$ git fetch origin 4210a9e07b3a8ff4255f5b9c9f737d420970670b:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/perl-CPAN
 * [new ref]         4210a9e07b3a8ff4255f5b9c9f737d420970670b -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 4210a9e Rebuilt for https://fedoraproject.org/wiki/Fedora_39_Mass_Rebuild