Thanks to Eric and Tom, I think I have got it. Here is the function
for adding a new student, who can select anything in public and can do
anything at all in their own schema.
revoke all on schema public from public; -- done only once
create or replace function new_student (text) returns void as $$
declare
t_name text;
begin
-- personal schema
execute 'create role ' || $1 || ' LOGIN';
execute 'create schema authorization ' || $1 ;
-- public schema
execute 'revoke all on schema public from ' || $1;
execute 'grant usage on schema public to ' || $1;
for t_name in select table_name from information_schema.tables
where table_schema = 'public' order by table_name loop
raise notice 'granting select to %s on %s', $1, t_name;
execute 'grant select on ' || t_name || ' to ' || $1;
end loop;
end;
$$ language plpgsql ;
select new_student ('fobar'); --etc
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