Re: WIP: a way forward on bootstrap data

From: Alvaro Herrera <alvherre(at)alvh(dot)no-ip(dot)org>
To: John Naylor <jcnaylor(at)gmail(dot)com>
Cc: David Fetter <david(at)fetter(dot)org>, Peter Eisentraut <peter(dot)eisentraut(at)2ndquadrant(dot)com>, pgsql-hackers <pgsql-hackers(at)postgresql(dot)org>
Subject: Re: WIP: a way forward on bootstrap data
Date: 2017-12-21 22:32:37
Message-ID: 20171221223237.tweqapdglenjek45@alvherre.pgsql
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Hmm, patch 0008 removes data lines from the .h but leaves the dependent
OID define lines around:

#define BTREE_AM_OID 403

This is not good, because then the define depends on data that appears
in a distant file. Another consideration is that the current system has
the property that these OIDs are discoverable by a hacker by navigating
to the containing .h file; and a missing symbol is easily fixable if
they need to hardcode the OID for which there isn't a symbol yet.

Maybe a generated .h file containing defines for OIDs from all catalogs
is okay. Of course, not all symbols are to be listed -- we should have
a special marker in the data lines for those that are. Maybe something
like this

{ oid => '403', descr => 'b-tree index access method',
amname => 'btree', amhandler => 'bthandler', amtype => 'i',
cpp_symbol => 'BTREE_AM_OID' },

(where 'cpp_symbol' would be skipped by genbki explicitly).

Any better ideas?

--
Álvaro Herrera https://www.2ndQuadrant.com/
PostgreSQL Development, 24x7 Support, Remote DBA, Training & Services

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