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Jacob Champion ad7fc3f1f8 pg_upgrade: Use max_protocol_version=3.0 for older servers 
The grease patch in 4966bd3ed found its first problem: prior to the
February 2018 patch releases, no server knew how to negotiate protocol
versions, so pg_upgrade needs to take that into account when speaking to
those older servers.

This will be true even after the grease feature is reverted; we don't
need anyone to trip over this again in the future. Backpatch so that all
supported versions of pg_upgrade can gracefully handle an update to the
default protocol version. (This is needed for any distributions that
link older binaries against newer libpqs, such as Debian.) Branches
prior to 18 need an additional version check, for the existence of
max_protocol_version.

Per buildfarm member crake.

Reviewed-by: Tom Lane <tgl@sss.pgh.pa.us>
Discussion: https://postgr.es/m/CAOYmi%2B%3D4QhCjssfNEoZVK8LPtWxnfkwT5p-PAeoxtG9gpNjqOQ%40mail.gmail.com
Backpatch-through: 14
2026-02-24 14:01:46 -08:00
..
backend Translation updates 2026-02-23 13:56:36 +01:00
bin pg_upgrade: Use max_protocol_version=3.0 for older servers 2026-02-24 14:01:46 -08:00
common Fix mb2wchar functions on short input. 2026-02-09 12:23:51 +13:00
fe_utils In fmtIdEnc(), handle failure of enlargePQExpBuffer(). 2025-02-16 12:46:35 -05:00
include Update obsolete comment 2026-02-18 18:09:54 +01:00
interfaces Translation updates 2026-02-23 13:56:36 +01:00
makefiles Optimize pg_popcount() with AVX-512 instructions. 2024-04-06 21:56:23 -05:00
pl Translation updates 2026-02-23 13:56:36 +01:00
port Fix O_CLOEXEC flag handling in Windows port. 2025-12-10 09:10:31 +13:00
template Remove AIX support 2024-02-28 15:17:23 +04:00
test Fix computation of varnullingrels when translating appendrel Var 2026-02-20 18:01:56 +09:00
timezone Update time zone data files to tzdata release 2025c. 2026-01-18 14:54:54 -05:00
tools Harden _int_matchsel() against being attached to the wrong operator. 2026-02-09 10:14:22 -05:00
tutorial Update copyright for 2024 2024-01-03 20:49:05 -05:00
.gitignore
DEVELOPERS
Makefile Remove distprep 2023-11-06 15:18:04 +01:00
Makefile.global.in Don't put library-supplied -L/-I switches before user-supplied ones. 2025-07-29 15:17:41 -04:00
Makefile.shlib Remove AIX support 2024-02-28 15:17:23 +04:00
meson.build Update copyright for 2024 2024-01-03 20:49:05 -05:00
nls-global.mk Fix update-po for the PGXS case 2025-10-16 20:21:05 +02:00