$ git clone -n https://src.fedoraproject.org/rpms/perl-Math-Int128.git /var/lib/mock/f45-build-24681-605/root/chroot_tmpdir/scmroot/perl-Math-Int128
Cloning into '/var/lib/mock/f45-build-24681-605/root/chroot_tmpdir/scmroot/perl-Math-Int128'...
$ git fetch origin 049be2e9c43360ee250292fc8500f5be14ac4699:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/perl-Math-Int128
 * [new ref]         049be2e9c43360ee250292fc8500f5be14ac4699 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 049be2e Perl 5.44 rebuild