Fix erroneous handling of shared dependencies (ie dependencies on roles)

in CREATE OR REPLACE FUNCTION.  The original code would update pg_shdepend
as if a new function was being created, even if it wasn't, with two bad
consequences: pg_shdepend might record the wrong owner for the function,
and any dependencies for roles mentioned in the function's ACL would be lost.
The fix is very easy: just don't touch pg_shdepend at all when doing a
function replacement.

Also update the CREATE FUNCTION reference page, which never explained
exactly what changes and doesn't change in a function replacement.
In passing, fix the CREATE VIEW reference page similarly; there's no
code bug there, but the docs didn't say what happens.

diff --git a/doc/src/sgml/ref/create_function.sgml b/doc/src/sgml/ref/create_function.sgml
index 2ca186c46bb5d44a0c47707e8fe5a2cd879b574b..60f1c3a4775be2ece339e3a37256d54275d603fb 100644 (file)
--- a/doc/src/sgml/ref/create_function.sgml
+++ b/doc/src/sgml/ref/create_function.sgml
@@ -1,5 +1,5 @@
 <!--
-$PostgreSQL: pgsql/doc/src/sgml/ref/create_function.sgml,v 1.78.2.1 2009/09/03 22:11:22 tgl Exp $
+$PostgreSQL: pgsql/doc/src/sgml/ref/create_function.sgml,v 1.78.2.2 2009/10/02 18:13:19 tgl Exp $
 -->
 
 <refentry id="SQL-CREATEFUNCTION">
@@ -490,6 +490,14 @@ CREATE FUNCTION foo(int, out text) ...
     <literal>USAGE</literal> privilege on the language.
    </para>
 
+   <para>
+    When <command>CREATE OR REPLACE FUNCTION</> is used to replace an
+    existing function, the ownership and permissions of the function
+    do not change.  All other function properties are assigned the
+    values specified or implied in the command.  You must own the function
+    to replace it (this includes being a member of the owning role).
+   </para>
+
  </refsect1>
 
  <refsect1 id="sql-createfunction-examples">

diff --git a/doc/src/sgml/ref/create_view.sgml b/doc/src/sgml/ref/create_view.sgml
index 1ad50f05d2ef80735f5e2436b33eef26d46ef19f..6f2fb1869b8ee19f06bc9ac99f62ae04cbe4de5d 100644 (file)
--- a/doc/src/sgml/ref/create_view.sgml
+++ b/doc/src/sgml/ref/create_view.sgml
@@ -1,5 +1,5 @@
 <!--
-$PostgreSQL: pgsql/doc/src/sgml/ref/create_view.sgml,v 1.36 2007/07/03 01:30:35 neilc Exp $
+$PostgreSQL: pgsql/doc/src/sgml/ref/create_view.sgml,v 1.36.2.1 2009/10/02 18:13:19 tgl Exp $
 PostgreSQL documentation
 -->
 
@@ -146,6 +146,14 @@ CREATE VIEW vista AS SELECT text 'Hello World' AS hello;
     used by the view.
    </para>
 
+   <para>
+    When <command>CREATE OR REPLACE VIEW</> is used on an
+    existing view, only the view's defining SELECT rule is changed.
+    Other view properties, including ownership, permissions, and non-SELECT
+    rules, remain unchanged.  You must own the view
+    to replace it (this includes being a member of the owning role).
+   </para>
+
  </refsect1>
 
  <refsect1>

diff --git a/src/backend/catalog/pg_proc.c b/src/backend/catalog/pg_proc.c
index a9feb2a56bdaba0b7bcaebe2faa4f25de386f712..c787662afca5c993acb6fb81602521357d4edc18 100644 (file)
--- a/src/backend/catalog/pg_proc.c
+++ b/src/backend/catalog/pg_proc.c
@@ -8,7 +8,7 @@
  *
  *
  * IDENTIFICATION
- *       $PostgreSQL: pgsql/src/backend/catalog/pg_proc.c,v 1.148 2008/01/01 19:45:48 momjian Exp $
+ *       $PostgreSQL: pgsql/src/backend/catalog/pg_proc.c,v 1.148.2.1 2009/10/02 18:13:19 tgl Exp $
  *
  *-------------------------------------------------------------------------
  */
@@ -84,6 +84,7 @@ ProcedureCreate(const char *procedureName,
        bool            genericOutParam = false;
        bool            internalInParam = false;
        bool            internalOutParam = false;
+       Oid                     proowner = GetUserId();
        Relation        rel;
        HeapTuple       tup;
        HeapTuple       oldtup;
@@ -224,7 +225,7 @@ ProcedureCreate(const char *procedureName,
        namestrcpy(&procname, procedureName);
        values[Anum_pg_proc_proname - 1] = NameGetDatum(&procname);
        values[Anum_pg_proc_pronamespace - 1] = ObjectIdGetDatum(procNamespace);
-       values[Anum_pg_proc_proowner - 1] = ObjectIdGetDatum(GetUserId());
+       values[Anum_pg_proc_proowner - 1] = ObjectIdGetDatum(proowner);
        values[Anum_pg_proc_prolang - 1] = ObjectIdGetDatum(languageObjectId);
        values[Anum_pg_proc_procost - 1] = Float4GetDatum(procost);
        values[Anum_pg_proc_prorows - 1] = Float4GetDatum(prorows);
@@ -279,7 +280,7 @@ ProcedureCreate(const char *procedureName,
                                        (errcode(ERRCODE_DUPLICATE_FUNCTION),
                        errmsg("function \"%s\" already exists with same argument types",
                                   procedureName)));
-               if (!pg_proc_ownercheck(HeapTupleGetOid(oldtup), GetUserId()))
+               if (!pg_proc_ownercheck(HeapTupleGetOid(oldtup), proowner))
                        aclcheck_error(ACLCHECK_NOT_OWNER, ACL_KIND_PROC,
                                                   procedureName);
 
@@ -333,7 +334,10 @@ ProcedureCreate(const char *procedureName,
                                                                procedureName)));
                }
 
-               /* do not change existing ownership or permissions, either */
+               /*
+                * Do not change existing ownership or permissions, either.  Note
+                * dependency-update code below has to agree with this decision.
+                */
                replaces[Anum_pg_proc_proowner - 1] = ' ';
                replaces[Anum_pg_proc_proacl - 1] = ' ';
 
@@ -360,12 +364,11 @@ ProcedureCreate(const char *procedureName,
        /*
         * Create dependencies for the new function.  If we are updating an
         * existing function, first delete any existing pg_depend entries.
+        * (However, since we are not changing ownership or permissions, the
+        * shared dependencies do *not* need to change, and we leave them alone.)
         */
        if (is_update)
-       {
                deleteDependencyRecordsFor(ProcedureRelationId, retval);
-               deleteSharedDependencyRecordsFor(ProcedureRelationId, retval);
-       }
 
        myself.classId = ProcedureRelationId;
        myself.objectId = retval;
@@ -399,7 +402,8 @@ ProcedureCreate(const char *procedureName,
        }
 
        /* dependency on owner */
-       recordDependencyOnOwner(ProcedureRelationId, retval, GetUserId());
+       if (!is_update)
+               recordDependencyOnOwner(ProcedureRelationId, retval, proowner);
 
        heap_freetuple(tup);