Re: Simplifications for error messages related to compression

On Wed, Dec 21, 2022 at 10:43:19AM +0900, Michael Paquier wrote:
> On Mon, Dec 19, 2022 at 02:42:13PM +0900, Michael Paquier wrote:
> > Thoughts or objections?
> 
> Hearing nothing, done..

-                       pg_fatal("not built with zlib support");
+                       pg_fatal("this build does not support compression with %s", "gzip");

I tried to say in the other thread that gzip != zlib.

This message may be better for translation, but (for WriteDataToArchive
et al) the message is now less accurate, and I suspect will cause some
confusion.

5e73a6048 introduced a similar user-facing issue: pg_dump -Fc -Z gzip
does not output a gzip.

$ ./tmp_install/usr/local/pgsql/bin/pg_dump -h /tmp -Fc -Z gzip regression |xxd |head
00000000: 5047 444d 5001 0e00 0408 0101 0100 0000  PGDMP...........

I'm okay with it if you think this is no problem - maybe it's enough to
document that the output is zlib and not gzip.

Otherwise, one idea was to reject "gzip" with -Fc.  It could accept
integers only.

BTW I think it's helpful to include the existing participants when
forking a thread.

-- 
Justin