[HACKERS] psql bug -- using old variables and database connection

We're currently printing the warning about connecting to the wrong version of
the server *before* syncing variables. On reconnecting this results in using
the *old* server version before reconnecting. I'm not sure what happens for
the initial connection but it can't be good. connection_warnings also uses
pset.db which isn't set until a few lines later too which can't be good.

e.g.

postgres=# \c
psql (8.4devel)
You are now connected to database "postgres".
postgres=# select version();
version
-----------------------------------------------------------------------------------------
PostgreSQL 8.2.5 on i686-pc-linux-gnu, compiled by GCC gcc (GCC) 4.2.1 (Debian 4.2.1-5)
(1 row)

postgres=# \c
psql (8.4devel, server 8.2.5)
WARNING: psql version 8.4, server version 8.2.
Some psql features might not work.
You are now connected to database "postgres".

--- command.c 30 Jul 2008 21:57:07 +0100 1.192
+++ command.c 12 Aug 2008 10:05:52 +0100
@@ -1197,10 +1197,10 @@
* Replace the old connection with the new one, and update
* connection-dependent variables.
*/
- connection_warnings();
PQsetNoticeProcessor(n_conn, NoticeProcessor, NULL);
pset.db = n_conn;
SyncVariables();
+ connection_warnings(); /* Must be after SyncVariables */

/* Tell the user about the new connection */
if (!pset.quiet)

--
Gregory Stark
EnterpriseDB http://www.enterprisedb.com
Get trained by Bruce Momjian - ask me about EnterpriseDB's PostgreSQL training!

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