Re: pgsql: Support "postgres -C" with runtime-computed GUCs

On 2021-Sep-17, Michael Paquier wrote:

> On Fri, Sep 17, 2021 at 08:08:44AM +0900, Michael Paquier wrote:
> > I am not completely sure what's going on here yet, so I'll just switch
> > the test to be skipped when Msys is involved for now. That should be
> > enough to bring back those machines to green.
>
> So, after drinking down a coffee, I have remembered the difference
> between the Msys and native perls when it comes to IPC::Run:
> - Msys perl generates \r\n.
> - Native perl generates \n.

Yeah, we've been here before -- see 015061690c65 and the commits
referenced there.

> We have already a couple of places where we filter that out, like
> PostgresNode::psql or slurp_file. But we are missing some spots
> before calling like() for outputs generated by IPC::Run. I have
> tracked all those places with the attached, and I think that this
> should take care of the failure seen here while preventing future
> problems.

Looks reasonable to me.

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