Re: pg_upgrade should truncate/remove its logs before running

On Wed, Dec 15, 2021 at 04:13:10PM -0600, Justin Pryzby wrote:
> On Wed, Dec 15, 2021 at 05:04:54PM -0500, Andrew Dunstan wrote:
>> The directory name needs to be predictable somehow, or maybe optionally
>> set as a parameter. Having just a timestamped directory name would make
>> life annoying for a poor buildfarm maintainer. Also, please don't change
>> anything before I have a chance to adjust the buildfarm code to what is
>> going to be done.
> 
> Feel free to suggest the desirable behavior.
> It could write to pg_upgrade.log/* and refuse to run if the dir already exists.

Andrew's point looks rather sensible to me.  So, this stuff should
have a predictable name (pg_upgrade.log, pg_upgrade_log or upgrade_log
would be fine).  But I would also add an option to be able to define a
custom log path.  The latter would be useful for the regression tests
so as everything gets could get redirected to a path already filtered
out.
--
Michael