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Re: [HACKERS] Moving tablespaces

From: Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>
To: Andrew Dunstan <andrew(at)dunslane(dot)net>
Cc: Magnus Hagander <magnus(at)hagander(dot)net>, Bruce Momjian <bruce(at)momjian(dot)us>, PostgreSQL-documentation <pgsql-docs(at)postgresql(dot)org>, PostgreSQL-development <pgsql-hackers(at)postgresql(dot)org>
Subject: Re: [HACKERS] Moving tablespaces
Date: 2011-12-04 17:07:31
Message-ID: 26148.1323018451@sss.pgh.pa.us (view raw or flat)
Thread:
Lists: pgsql-docspgsql-hackers
Andrew Dunstan <andrew(at)dunslane(dot)net> writes:
> On 12/04/2011 11:41 AM, Tom Lane wrote:
>> Hm, how portable is symlink-reading?  If we can actually do that
>> without big headaches, then +1.

> I wondered that, specifically about Windows junction points, but we seem 
> to have support for it already in dirmod.c::pgreadlink(). Surely there's 
> no other currently supported platform where it would even be a question?

readlink is required by Single Unix Spec v2 (1997), which is what we've
been treating as our baseline expectation for Unix-oid platforms for
awhile now.  Given that we dealt with the Windows side already, I don't
see a problem with making this assumption.  At worst we'd end up needing
a couple more emulations in src/port, since surely there's *some* way to
do it on any platform with symlinks.

			regards, tom lane

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