Re: [PATCH] pg_upgrade: report the reason for failing to open thecluster version file

> On 26 Feb 2020, at 00:14, Dagfinn Ilmari Mannsåker <ilmari@ilmari.org> wrote:

> It would have saved some minutes of debugging time if that had included
> the reason why the open failed, so here's a patch to do so.

+1 on the attached patch.  A quick skim across the similar error reportings in
pg_upgrade doesn't turn up any others which lack the more detailed information.

> -        pg_fatal("could not open version file: %s\n", ver_filename);
> +        pg_fatal("could not open version file \"%s\": %m\n", ver_filename);

A few lines further down from this we report an error in case we are unable to
parse the file in question:

        pg_fatal("could not parse PG_VERSION file from %s\n", cluster->pgdata);

Should the pgdata argument be quoted there as well, like \"%s\", to make it
consistent for how we report filenames and directories in pg_upgrade?

cheers ./daniel