Fix multiple minor infelicities in aclchk.c error reports.

pg_type_aclmask reported the wrong type's OID when complaining that
it could not find a type's typelem.  It also failed to provide a
suitable errcode when the initially given OID doesn't exist (which
is a user-facing error, since that OID can be user-specified).
pg_foreign_data_wrapper_aclmask and pg_foreign_server_aclmask likewise
lacked errcode specifications.  Trivial cosmetic adjustments too.

The wrong-type-OID problem was reported by Petru-Florin Mihancea in
bug #14186; the other issues noted by me while reading the code.
These errors all seem to be aboriginal in the respective routines, so
back-patch as necessary.

Report: <20160613163159.5798.52928@wrigleys.postgresql.org>

diff --git a/src/backend/catalog/aclchk.c b/src/backend/catalog/aclchk.c
index d074e85b27ab1fc0536e6e544864c72170d2c513..1dc0f2d5ac6cc1e91b1e9414bfac75563d1dfcd0 100644 (file)
--- a/src/backend/catalog/aclchk.c
+++ b/src/backend/catalog/aclchk.c
@@ -4108,7 +4108,8 @@ pg_foreign_data_wrapper_aclmask(Oid fdw_oid, Oid roleid,
        tuple = SearchSysCache1(FOREIGNDATAWRAPPEROID, ObjectIdGetDatum(fdw_oid));
        if (!HeapTupleIsValid(tuple))
                ereport(ERROR,
-                               (errmsg("foreign-data wrapper with OID %u does not exist",
+                               (errcode(ERRCODE_UNDEFINED_OBJECT),
+                                errmsg("foreign-data wrapper with OID %u does not exist",
                                                fdw_oid)));
        fdwForm = (Form_pg_foreign_data_wrapper) GETSTRUCT(tuple);
 
@@ -4169,7 +4170,8 @@ pg_foreign_server_aclmask(Oid srv_oid, Oid roleid,
        tuple = SearchSysCache1(FOREIGNSERVEROID, ObjectIdGetDatum(srv_oid));
        if (!HeapTupleIsValid(tuple))
                ereport(ERROR,
-                               (errmsg("foreign server with OID %u does not exist",
+                               (errcode(ERRCODE_UNDEFINED_OBJECT),
+                                errmsg("foreign server with OID %u does not exist",
                                                srv_oid)));
        srvForm = (Form_pg_foreign_server) GETSTRUCT(tuple);
 
@@ -4228,27 +4230,30 @@ pg_type_aclmask(Oid type_oid, Oid roleid, AclMode mask, AclMaskHow how)
        tuple = SearchSysCache1(TYPEOID, ObjectIdGetDatum(type_oid));
        if (!HeapTupleIsValid(tuple))
                ereport(ERROR,
-                               (errmsg("type with OID %u does not exist",
+                               (errcode(ERRCODE_UNDEFINED_OBJECT),
+                                errmsg("type with OID %u does not exist",
                                                type_oid)));
        typeForm = (Form_pg_type) GETSTRUCT(tuple);
 
-       /* "True" array types don't manage permissions of their own */
-       if (typeForm->typelem != 0 && typeForm->typlen == -1)
+       /*
+        * "True" array types don't manage permissions of their own; consult the
+        * element type instead.
+        */
+       if (OidIsValid(typeForm->typelem) && typeForm->typlen == -1)
        {
                Oid                     elttype_oid = typeForm->typelem;
 
                ReleaseSysCache(tuple);
 
                tuple = SearchSysCache1(TYPEOID, ObjectIdGetDatum(elttype_oid));
+               /* this case is not a user-facing error, so elog not ereport */
                if (!HeapTupleIsValid(tuple))
-                       ereport(ERROR,
-                                       (errmsg("type with OID %u does not exist",
-                                                       type_oid)));
+                       elog(ERROR, "cache lookup failed for type %u", elttype_oid);
                typeForm = (Form_pg_type) GETSTRUCT(tuple);
        }
 
        /*
-        * Normal case: get the type's ACL from pg_type
+        * Now get the type's owner and ACL from the tuple
         */
        ownerId = typeForm->typowner;