Horton

Re: Backporting BackgroundPsql

Tom Lane <tgl@sss.pgh.pa.us>

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From: Tom Lane <tgl@sss.pgh.pa.us>
To: Andres Freund <andres@anarazel.de>
Cc: Heikki Linnakangas <hlinnaka@iki.fi>, PostgreSQL Hackers <pgsql-hackers@postgresql.org>, Daniel Gustafsson <daniel@yesql.se>, Andrew Dunstan <andrew@dunslane.net>, Melanie Plageman <melanieplageman@gmail.com>, Amit Kapila <amit.kapila16@gmail.com>, Mikael Kjellström <mikael.kjellstrom@gmail.com>
Date: 2024-06-25T14:26:00Z
Lists: pgsql-hackers 
Andres Freund <andres@anarazel.de> writes:
> On 2024-06-25 13:26:23 +0300, Heikki Linnakangas wrote:
>> 1. Write the new test differently on backbranches. Before 664d757531, the
>> test needs to work a lot harder to use the background psql session, calling
>> pump() etc. That's doable, but as noted in the discussion that led to
>> 664d757531, it's laborious and error-prone.
>> 
>> 2. Backport commit 664d757531. This might break out-of-tree perl tests that
>> use the background_psql() function. I don't know if any such tests exist,
>> and they would need to be changed for v17 anyway, so that seems acceptable.
>> Anyone aware of any extensions using the perl test modules?
>> 
>> 3. Backport commit 664d757531, but keep the existing background_psql()
>> function unchanged. Add a different constructor to get the v17-style
>> BackgroundPsql session, something like "$node->background_psql_new()".

> Yes, I've wished for this a couple times. I think 2 or 3 would be reasonable.
> I think 1) often just leads to either tests not being written or being
> fragile...

I'd vote for (2).  (3) is just leaving a foot-gun for people to
hurt themselves with.

			regards, tom lane

Commits

  1. Fix missing installation/uninstallation rules for BackgroundPsql.pm

  2. Backport BackgroundPsql perl test module

  3. Add missing uninstallation rule for BackgroundPsql.pm

  4. Fix missing installation rules for BackgroundPsql.pm

  5. Skip \password TAP test on old IPC::Run versions

  6. Test SCRAM iteration changes with psql \password

  7. Refactor background psql TAP functions