Re: Introduce pg_receivewal gzip compression tests

‐‐‐‐‐‐‐ Original Message ‐‐‐‐‐‐‐

On Monday, July 12th, 2021 at 17:07, <gkokolatos(at)pm(dot)me> wrote:

> ‐‐‐‐‐‐‐ Original Message ‐‐‐‐‐‐‐
>
> On Monday, July 12th, 2021 at 13:04, Michael Paquier michael(at)paquier(dot)xyz wrote:
>
> > On Mon, Jul 12, 2021 at 09:42:32AM +0000, gkokolatos(at)pm(dot)me wrote:
> >
> > > This to my understanding means that gzip is expected to exist.
> > >
> > > If this is correct, then simply checking for the headers should
> > >
> > > suffice, since that is the only dependency for the files to be
> > >
> > > created.
> >
> > You cannot expect this to work on Windows when it comes to MSVC for
> >
> > example, as gzip may not be in the environment PATH so the test would
> >
> > fail hard. Let's just rely on $ENV{GZIP} instead, and skip the test
> >
> > if it is not defined.
>
> I am admittedly not so well versed on Windows systems. Thank you for
>
> informing me.
>
> Please find attached v3 of the patch where $ENV{GZIP_PROGRAM} is used
>
> instead. To the best of my knowledge one should avoid using $ENV{GZIP}
>
> because that would translate to the obsolete, yet used environment
>
> variable GZIP which holds a set of default options for gzip. In essence
>
> it would be equivalent to executing:
>
> GZIP=gzip gzip --test <files>
>
> which can result to errors similar to:
>
> gzip: gzip: non-option in GZIP environment variable
>

After a bit more thinking, I went ahead and added on top of v3 a test
verifying that the gzip program can actually be called.

Please find v4 attached.

Cheers,
//Georgios

>
> > Michael