Re: [Patch] pg_rewind: options to use restore_command from recovery.conf or command line

From: Alexander Korotkov <a(dot)korotkov(at)postgrespro(dot)ru>
To: Peter Eisentraut <peter(dot)eisentraut(at)2ndquadrant(dot)com>
Cc: Michael Paquier <michael(at)paquier(dot)xyz>, Alexey Kondratov <a(dot)kondratov(at)postgrespro(dot)ru>, Alvaro Herrera <alvherre(at)2ndquadrant(dot)com>, Kuntal Ghosh <kuntalghosh(dot)2007(at)gmail(dot)com>, Liudmila Mantrova <l(dot)mantrova(at)postgrespro(dot)ru>, Thomas Munro <thomas(dot)munro(at)gmail(dot)com>, Andrey Borodin <x4mmm(at)yandex-team(dot)ru>, David Steele <david(at)pgmasters(dot)net>, Andres Freund <andres(at)anarazel(dot)de>, PostgreSQL-development <pgsql-hackers(at)postgresql(dot)org>, Dmitry Dolgov <9erthalion6(at)gmail(dot)com>, vladimirlesk(at)yandex-team(dot)ru, dsarafan(at)yandex-team(dot)ru
Subject: Re: [Patch] pg_rewind: options to use restore_command from recovery.conf or command line
Date: 2020-06-07 19:05:03
Message-ID: CAPpHfdvKr7-UxGpvAbMnT2vbKuyq7ctUCnyXsOLWDkjA2kUnEQ@mail.gmail.com
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Hi!

On Sat, Jun 6, 2020 at 8:49 PM Peter Eisentraut
<peter(dot)eisentraut(at)2ndquadrant(dot)com> wrote:
>
> On 2020-03-31 08:48, Michael Paquier wrote:
> > On Mon, Mar 30, 2020 at 05:00:01PM +0300, Alexey Kondratov wrote:
> >> What do think about adding following sanity check into xlogarchive.c?
> >>
> >> +#ifdef FRONTEND
> >> +#error "This file is not expected to be compiled for frontend code"
> >> +#endif
> >>
> >> It would prevent someone from adding typedefs and any other common
> >> definitions into xlogarchive.h in the future, leading to the accidental
> >> inclusion of both xlogarchive.h and fe_archive.h in the same time.
> > I don't see much the point as this would fail to compile anyway, and
> > that's not project-style. Note that we have already a clear
> > separation here between the backend and the frontend code here as
> > xlogarchive.h is backend-only and fe_archive.h is frontend-only.
>
> Why is fe_archive.c in src/common/ and not in src/fe_utils/? It is not
> "common" to frontend and backend.

Yep, this seems wrong to me. I can propose following file rename.

src/common/fe_archive.c => src/fe_utils/archive.c
include/common/fe_archive.h => include/fe_utils/archive.h

> It actually defines functions that clash with functions in the backend,
> so this seems doubly wrong.

Let's have frontend version of RestoreArchivedFile() renamed as well.
What about RestoreArchivedFileFrontend()?

------
Alexander Korotkov
Postgres Professional: http://www.postgrespro.com
The Russian Postgres Company

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