Commitffda059

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Give a proper error message if connecting to incompatible server.

The WAL streaming message format changed in 9.3, so 9.3 pg_basebackup orpg_receivelog won't work against older servers.

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Original file line number	Diff line number	Diff line change
`@@ -342,6 +342,21 @@ ReceiveXlogStream(PGconn *conn, XLogRecPtr startpos, uint32 timeline,`
`342`	`342`	`int64last_status=-1;`
`343`	`343`	`XLogRecPtrblockpos=InvalidXLogRecPtr;`
`344`	`344`
	`345`	`+/*`
	`346`	`+ * The message format used in streaming replication changed in 9.3, so we`
	`347`	`+ * cannot stream from older servers. Don't know if we would work with`
	`348`	`+ * newer versions, but let's not take the risk.`
	`349`	`+ */`
	`350`	`+if (PQserverVersion(conn) /100!=PG_VERSION_NUM /100)`
	`351`	`+{`
	`352`	`+constchar*serverver=PQparameterStatus(conn,"server_version");`
	`353`	`+fprintf(stderr,_("%s: incompatible server version %s; streaming is only supported with server version %s\n"),`
	`354`	`+progname,`
	`355`	`+serverver ?serverver :"'unknown'",`
	`356`	`+PG_MAJORVERSION);`
	`357`	`+return false;`
	`358`	`+}`
	`359`	`+`
`345`	`360`	`if (sysidentifier!=NULL)`
`346`	`361`	`{`
`347`	`362`	`/* Validate system identifier and timeline hasn't changed */`

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