Allow a non-superuser database owner to vacuum all tables in his

database, including system catalogs (but not the shared catalogs,
since they don't really belong to his database).  This is per recent
mailing list discussion.  Clean up some other code that also checks
for database ownerness by introducing a test function is_dbadmin().

1 files changed, 44 insertions, 12 deletions

diff --git a/src/backend/utils/misc/superuser.c b/src/backend/utils/misc/superuser.c
index e539d57347..73cfe8cb97 100644
--- a/src/backend/utils/misc/superuser.c
+++ b/src/backend/utils/misc/superuser.c
@@ -1,35 +1,38 @@
 /*-------------------------------------------------------------------------
  *
  * superuser.c
- *
  *	  The superuser() function.  Determines if user has superuser privilege.
+ *	  Also, a function to check for the owner (datdba) of a database.
+ *
  *
  * Portions Copyright (c) 1996-2001, PostgreSQL Global Development Group
  * Portions Copyright (c) 1994, Regents of the University of California
  *
  *
  * IDENTIFICATION
- *	  $Header: /cvsroot/pgsql/src/backend/utils/misc/superuser.c,v 1.17 2001/01/24 19:43:16 momjian Exp $
+ *	  $Header: /cvsroot/pgsql/src/backend/utils/misc/superuser.c,v 1.18 2001/06/13 21:44:41 tgl Exp $
  *
- * DESCRIPTION
- *	  See superuser().
  *-------------------------------------------------------------------------
  */
-
 #include "postgres.h"
+
+#include "access/heapam.h"
+#include "catalog/catname.h"
+#include "catalog/pg_database.h"
 #include "catalog/pg_shadow.h"
 #include "utils/syscache.h"
 #include "miscadmin.h"
+#include "utils/fmgroids.h"
 
+
+/*
+ * The Postgres user running this command has Postgres superuser privileges
+ */
 bool
 superuser(void)
 {
-/*--------------------------------------------------------------------------
-	The Postgres user running this command has Postgres superuser
-	privileges.
---------------------------------------------------------------------------*/
+	bool		result = false;
 	HeapTuple	utup;
-	bool		result;
 
 	utup = SearchSysCache(SHADOWSYSID,
 						  ObjectIdGetDatum(GetUserId()),
@@ -38,7 +41,36 @@ superuser(void)
 	{
 		result = ((Form_pg_shadow) GETSTRUCT(utup))->usesuper;
 		ReleaseSysCache(utup);
-		return result;
 	}
-	return false;
+	return result;
+}
+
+/*
+ * The Postgres user running this command is the owner of the specified
+ * database.
+ */
+bool
+is_dbadmin(Oid dbid)
+{
+	Relation	pg_database;
+	ScanKeyData entry[1];
+	HeapScanDesc scan;
+	HeapTuple	dbtuple;
+	int32		dba;
+
+	/* There's no syscache for pg_database, so must look the hard way */
+	pg_database = heap_openr(DatabaseRelationName, AccessShareLock);
+	ScanKeyEntryInitialize(&entry[0], 0x0,
+						   ObjectIdAttributeNumber, F_OIDEQ,
+						   ObjectIdGetDatum(dbid));
+	scan = heap_beginscan(pg_database, 0, SnapshotNow, 1, entry);
+	dbtuple = heap_getnext(scan, 0);
+	if (!HeapTupleIsValid(dbtuple))
+		elog(ERROR, "database %u does not exist", dbid);
+	dba = ((Form_pg_database) GETSTRUCT(dbtuple))->datdba;
+	heap_endscan(scan);
+	heap_close(pg_database, AccessShareLock);
+
+	/* XXX some confusion about whether userids are OID or int4 ... */
+	return (GetUserId() == (Oid) dba);
 }