$ git clone -n https://src.fedoraproject.org/rpms/perl-UNIVERSAL-ref.git /var/lib/mock/f31-build-66236-29843/root/chroot_tmpdir/scmroot/perl-UNIVERSAL-ref
Cloning into '/var/lib/mock/f31-build-66236-29843/root/chroot_tmpdir/scmroot/perl-UNIVERSAL-ref'...
$ git reset --hard c88d9c1ea8db68969c4a5c431892e4743e41db80
HEAD is now at c88d9c1 - Rebuilt for https://fedoraproject.org/wiki/Fedora_31_Mass_Rebuild