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Add a server version check to pg_basebackup and pg_receivexlog.

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These programs don't work against 9.0 or earlier servers, so check that when
the connection is made. That's better than a cryptic error message you got
before.

Also, these programs won't work with a 9.3 server, because the WAL streaming
protocol was changed in a non-backwards-compatible way. As a general rule,
we don't make any guarantee that an old client will work with a new server,
so check that. However, allow a 9.1 client to connect to a 9.2 server, to
avoid breaking environments that currently work; a 9.1 client happens to
work with a 9.2 server, even though we didn't make any great effort to
ensure that.

This patch is for the 9.1 and 9.2 branches, I'll commit a similar patch to
master later. Although this isn't a critical bug fix, it seems safe enough
to back-patch. The error message you got when connecting to a 9.3devel
server without this patch was cryptic enough to warrant backpatching.
This commit is contained in:
Heikki Linnakangas
2013-03-25 11:02:55 +02:00
parent 3a003c5a3a
commit 6980497f7d
2 changed files with 36 additions and 0 deletions
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18
src/bin/pg_basebackup/pg_basebackup.c
View File

@ -947,6 +947,9 @@ BaseBackup(void)
int i;
char xlogstart[64];
char xlogend[64];
int minServerMajor,
maxServerMajor;
int serverMajor;
/*
* Connect in replication mode to the server
@ -956,6 +959,21 @@ BaseBackup(void)
/* Error message already written in GetConnection() */
exit(1);
/*
* Check server version. BASE_BACKUP command was introduced in 9.1, so
* we can't work with servers older than 9.1. And we don't support servers
* newer than the client.
*/
minServerMajor = 901;
maxServerMajor = PG_VERSION_NUM / 100;
serverMajor = PQserverVersion(conn) / 100;
if (serverMajor < minServerMajor || serverMajor > maxServerMajor)
{
fprintf(stderr, _("%s: unsupported server version %s\n"),
progname, PQparameterStatus(conn, "server_version"));
disconnect_and_exit(1);
}
/*
* Run IDENTIFY_SYSTEM so we can get the timeline
*/

18
src/bin/pg_basebackup/pg_receivexlog.c
View File

@ -220,6 +220,9 @@ StreamLog(void)
PGresult *res;
uint32 timeline;
XLogRecPtr startpos;
int minServerMajor,
maxServerMajor;
int serverMajor;
/*
* Connect in replication mode to the server
@ -229,6 +232,21 @@ StreamLog(void)
/* Error message already written in GetConnection() */
return;
/*
* Check server version. IDENTIFY_SYSTEM didn't return the current xlog
* position before 9.1, so we can't work with servers older than 9.1. And
* we don't support servers newer than the client.
*/
minServerMajor = 901;
maxServerMajor = PG_VERSION_NUM / 100;
serverMajor = PQserverVersion(conn) / 100;
if (serverMajor < minServerMajor || serverMajor > maxServerMajor)
{
fprintf(stderr, _("%s: unsupported server version %s\n"),
progname, PQparameterStatus(conn, "server_version"));
disconnect_and_exit(1);
}
/*
* Run IDENTIFY_SYSTEM so we can get the timeline and current xlog
* position.