On Mon, Feb 15, 2016 at 6:29 PM, Bruce Momjian <br...@momjian.us> wrote:

> Someone on IRC reported that if they had run the pg_upgrade-created
> delete_old_cluster.sh shell script it would have deleted their old _and_
> new data directories.  (Fortunately they didn't run it.)
> I was confused how this could have happened, and the user explained that
> their old cluster was in /u/pgsql/data, and that they wanted to switch to
> a per-major-version directory naming schema, so they put the new data
> directory in /u/pgsql/data/9.5.  (They could have just moved the
> directory while the server was down, but didn't.)
> Unfortunately, there is no check for having the new cluster data
> directory inside the old data directory, only a check for tablespace
> directories in the old cluster.  (I never anticipated someone would do
> this.)

Interesting - I definitely wouldn't have expected that either. And it
definitely seems like a foot-gun we should protect the users against.

 Magnus Hagander
 Me: http://www.hagander.net/
 Work: http://www.redpill-linpro.com/

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