Ensure schema qualification in pg_restore DISABLE/ENABLE TRIGGER commands.

tglsfdc · tglsfdc · commit 05aeeb5e2803 · 2018-08-17T17:12:21.000-04:00
Previously, this code blindly followed the common coding pattern of passing PQserverVersion(AH->connection) as the server-version parameter of fmtQualifiedId. That works as long as we have a connection; but in pg_restore with text output, we don't. Instead we got a zero from PQserverVersion, which fmtQualifiedId interpreted as "server is too old to have schemas", and so the name went unqualified. That still accidentally managed to work in many cases, which is probably why this ancient bug went undetected for so long. It only became obvious in the wake of the changes to force dump/restore to execute with restricted search_path. In HEAD/v11, let's deal with this by ripping out fmtQualifiedId's server- version behavioral dependency, and just making it schema-qualify all the time. We no longer support pg_dump from servers old enough to need the ability to omit schema name, let alone restoring to them. (Also, the few callers outside pg_dump already didn't work with pre-schema servers.) In older branches, that's not an acceptable solution, so instead just tweak the DISABLE/ENABLE TRIGGER logic to ensure it will schema-qualify its output regardless of server version. Per bug #15338 from Oleg somebody. Back-patch to all supported branches. Discussion: https://postgr.es/m/153452458706.1316.5328079417086507743@wrigleys.postgresql.org
diff --git a/src/bin/pg_dump/pg_backup_archiver.c b/src/bin/pg_dump/pg_backup_archiver.c
@@ -992,10 +992,12 @@ _disableTriggersIfNecessary(ArchiveHandle *AH, TocEntry *te)
 	_becomeUser(AH, ropt->superuser);
 
 	/*
-	 * Disable them.
+	 * Disable them.  Assume that the table name should be schema-qualified
+	 * (we can't look at PQserverVersion, since we might not have any
+	 * connection; and anyway we don't promise our output will load pre-7.3).
 	 */
 	ahprintf(AH, "ALTER TABLE %s DISABLE TRIGGER ALL;\n\n",
-			 fmtQualifiedId(PQserverVersion(AH->connection),
+			 fmtQualifiedId(70300,
 							te->namespace,
 							te->tag));
 }
@@ -1020,10 +1022,10 @@ _enableTriggersIfNecessary(ArchiveHandle *AH, TocEntry *te)
 	_becomeUser(AH, ropt->superuser);
 
 	/*
-	 * Enable them.
+	 * Enable them.  As above, force schema qualification.
 	 */
 	ahprintf(AH, "ALTER TABLE %s ENABLE TRIGGER ALL;\n\n",
-			 fmtQualifiedId(PQserverVersion(AH->connection),
+			 fmtQualifiedId(70300,
 							te->namespace,
 							te->tag));
 }
