$ git clone -n https://src.fedoraproject.org/rpms/perl-Net-IPv6Addr.git /var/lib/mock/f45-build-25305-610/root/chroot_tmpdir/scmroot/perl-Net-IPv6Addr
Cloning into '/var/lib/mock/f45-build-25305-610/root/chroot_tmpdir/scmroot/perl-Net-IPv6Addr'...
$ git fetch origin 14acb3e2782968c266c719514f3083e217894964:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/perl-Net-IPv6Addr
 * [new ref]         14acb3e2782968c266c719514f3083e217894964 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 14acb3e Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild