Re: pg_upgrade: fail early if a tablespace dir already exists for new cluster version

Hi,

On 2020-10-15 19:35:30 -0400, Bruce Momjian wrote:
> On Fri, Oct 9, 2020 at 07:42:51PM -0400, Bruce Momjian wrote:
> > On Fri, Oct 9, 2020 at 02:23:10PM -0500, Justin Pryzby wrote:
> > > In my local branch, I had revised this comment to say:
> > >
> > > + * Note, v8.4 has no tablespace_suffix, which is fine so long as the version we
> > > + * being upgraded *to* has a suffix, since it's not allowed to pg_upgrade from
> > > + * a version to the same version if tablespaces are in use.
> >
> > OK, updated patch attached. Also, from your original patch, I didn't
> > need to call canonicalize_path() since we are not comparing paths, and I
> > didn't need to include common/relpath.h. I also renamed a variable.
>
> Patch applied to all supported versions. Thanks for the report, and the
> patch. While I listed you as reporter, I forgot to list you as the
> patch author --- Tom, can you remember that for the minor release notes
> please? Thanks

This fails on some animals <= 11, because we didn't yet rely on C99.

https://buildfarm.postgresql.org/cgi-bin/show_log.pl?nm=rhinoceros&dt=2020-10-15%2023%3A52%3A04
check.c:503:2: error: \342\200\230for\342\200\231 loop initial declarations are only allowed in C99 mode
for (int tblnum = 0; tblnum < os_info.num_old_tablespaces; tblnum++)

Greetings,

Andres Freund