On Mon, Dec 03, 2012 at 01:14:30PM -0500, Andrew Dunstan wrote:
> I think it would be reasonable for it to complain if it came across a
> PG_VERSION file in an unexpected location.
That sounds like a reliable approach to detecting the hazard. Pseudocode:
chdir(proposed_tablespace_path)
do {
if (stat("PG_VERSION"))
ereport(WARNING, ...)
} while (chdir(".."))
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