* Portions Copyright (c) 1994, Regents of the University of California
*
* IDENTIFICATION
- * $Header: /cvsroot/pgsql/src/backend/catalog/namespace.c,v 1.38.2.2 2003/03/06 22:55:03 tgl Exp $
+ * $Header: /cvsroot/pgsql/src/backend/catalog/namespace.c,v 1.38.2.3 2007/04/20 02:38:58 tgl Exp $
*
*-------------------------------------------------------------------------
*/
* SQL99. Also, this provides a way to search the system namespace first
* without thereby making it the default creation target namespace.)
*
+ * For security reasons, searches using the search path will ignore the temp
+ * namespace when searching for any object type other than relations and
+ * types. (We must allow types since temp tables have rowtypes.)
+ *
* The default creation target namespace is normally equal to the first
* element of the explicit list, but is the "special" namespace when one
* has been set. If the explicit list is empty and there is no special
* namespace, there is no default target.
*
- * In bootstrap mode, the search path is set equal to 'pg_catalog', so that
+ * The textual specification of search_path can include "$user" to refer to
+ * the namespace named the same as the current user, if any. (This is just
+ * ignored if there is no such namespace.) Also, it can include "pg_temp"
+ * to refer to the current backend's temp namespace. This is usually also
+ * ignorable if the temp namespace hasn't been set up, but there's a special
+ * case: if "pg_temp" appears first then it should be the default creation
+ * target. We kluge this case a little bit so that the temp namespace isn't
+ * set up until the first attempt to create something in it. (The reason for
+ * klugery is that we can't create the temp namespace outside a transaction,
+ * but initial GUC processing of search_path happens outside a transaction.)
+ * tempCreationPending is TRUE if "pg_temp" appears first in the string but
+ * is not reflected in defaultCreationNamespace because the namespace isn't
+ * set up yet.
+ *
+ * In bootstrap mode, the search path is set equal to "pg_catalog", so that
* the system namespace is the only one searched or inserted into.
- * The initdb script is also careful to set search_path to 'pg_catalog' for
+ * The initdb script is also careful to set search_path to "pg_catalog" for
* its post-bootstrap standalone backend runs. Otherwise the default search
* path is determined by GUC. The factory default path contains the PUBLIC
* namespace (if it exists), preceded by the user's personal namespace
/* first explicit member of list; usually same as defaultCreationNamespace */
static Oid firstExplicitNamespace = InvalidOid;
-/* The above four values are valid only if namespaceSearchPathValid */
+/* if TRUE, defaultCreationNamespace is wrong, it should be temp namespace */
+static bool tempCreationPending = false;
+
+/* The above five values are valid only if namespaceSearchPathValid */
static bool namespaceSearchPathValid = true;
/*
if (newRelation->schemaname)
{
+ /* check for pg_temp alias */
+ if (strcmp(newRelation->schemaname, "pg_temp") == 0)
+ {
+ /* Initialize temp namespace if first time through */
+ if (!OidIsValid(myTempNamespace))
+ InitTempTableNamespace();
+ return myTempNamespace;
+ }
/* use exact schema given */
namespaceId = GetSysCacheOid(NAMESPACENAME,
CStringGetDatum(newRelation->schemaname),
{
/* use the default creation namespace */
recomputeNamespacePath();
+ if (tempCreationPending)
+ {
+ /* Need to initialize temp namespace */
+ InitTempTableNamespace();
+ return myTempNamespace;
+ }
namespaceId = defaultCreationNamespace;
if (!OidIsValid(namespaceId))
elog(ERROR, "No namespace has been selected to create in");
}
else
{
- /* Consider only procs that are in the search path */
+ /*
+ * Consider only procs that are in the search path and are not
+ * in the temp namespace.
+ */
List *nsp;
foreach(nsp, namespaceSearchPath)
{
- if (procform->pronamespace == (Oid) lfirsti(nsp))
+ if (procform->pronamespace == (Oid) lfirsti(nsp) &&
+ procform->pronamespace != myTempNamespace)
break;
pathpos++;
}
}
else
{
- /* Consider only opers that are in the search path */
+ /*
+ * Consider only opers that are in the search path and are not
+ * in the temp namespace.
+ */
List *nsp;
foreach(nsp, namespaceSearchPath)
{
- if (operform->oprnamespace == (Oid) lfirsti(nsp))
+ if (operform->oprnamespace == (Oid) lfirsti(nsp) &&
+ operform->oprnamespace != myTempNamespace)
break;
pathpos++;
}
/* Consider only opclasses that are in the search path */
foreach(nsp, namespaceSearchPath)
{
- if (opcform->opcnamespace == (Oid) lfirsti(nsp))
+ if (opcform->opcnamespace == (Oid) lfirsti(nsp) &&
+ opcform->opcnamespace != myTempNamespace)
break;
pathpos++;
}
{
Oid namespaceId = (Oid) lfirsti(lptr);
+ if (namespaceId == myTempNamespace)
+ continue; /* do not look in temp namespace */
+
opcid = GetSysCacheOid(CLAAMNAMENSP,
ObjectIdGetDatum(amid),
PointerGetDatum(opcname),
Oid namespaceId;
AclResult aclresult;
+ /* check for pg_temp alias */
+ if (strcmp(nspname, "pg_temp") == 0)
+ {
+ if (OidIsValid(myTempNamespace))
+ return myTempNamespace;
+ /*
+ * Since this is used only for looking up existing objects, there
+ * is no point in trying to initialize the temp namespace here;
+ * and doing so might create problems for some callers.
+ * Just fall through and give the "does not exist" error.
+ */
+ }
+
namespaceId = GetSysCacheOid(NAMESPACENAME,
CStringGetDatum(nspname),
0, 0, 0);
* format), determine what namespace the object should be created in.
* Also extract and return the object name (last component of list).
*
- * This is *not* used for tables. Hence, the TEMP table namespace is
- * never selected as the creation target.
+ * Note: calling this may result in a CommandCounterIncrement operation,
+ * if we have to create or clean out the temp namespace.
*/
Oid
QualifiedNameGetCreationNamespace(List *names, char **objname_p)
{
char *schemaname;
- char *objname;
Oid namespaceId;
/* deconstruct the name list */
- DeconstructQualifiedName(names, &schemaname, &objname);
+ DeconstructQualifiedName(names, &schemaname, objname_p);
if (schemaname)
{
+ /* check for pg_temp alias */
+ if (strcmp(schemaname, "pg_temp") == 0)
+ {
+ /* Initialize temp namespace if first time through */
+ if (!OidIsValid(myTempNamespace))
+ InitTempTableNamespace();
+ return myTempNamespace;
+ }
/* use exact schema given */
namespaceId = GetSysCacheOid(NAMESPACENAME,
CStringGetDatum(schemaname),
{
/* use the default creation namespace */
recomputeNamespacePath();
+ if (tempCreationPending)
+ {
+ /* Need to initialize temp namespace */
+ InitTempTableNamespace();
+ return myTempNamespace;
+ }
namespaceId = defaultCreationNamespace;
if (!OidIsValid(namespaceId))
elog(ERROR, "No namespace has been selected to create in");
/* Note: callers will check for CREATE rights when appropriate */
- *objname_p = objname;
return namespaceId;
}
foreach(lptr, namespaceSearchPath)
{
namespaceId = (Oid) lfirsti(lptr);
+
+ if (namespaceId == myTempNamespace)
+ continue; /* do not look in temp namespace */
+
conoid = FindConversion(conversion_name, namespaceId);
if (OidIsValid(conoid))
return conoid;
{
Oid namespaceId = (Oid) lfirsti(lptr);
+ if (namespaceId == myTempNamespace)
+ continue; /* do not look in temp namespace */
+
proc = FindDefaultConversion(namespaceId, for_encoding, to_encoding);
if (OidIsValid(proc))
return proc;
List *oidlist;
List *newpath;
List *l;
+ bool temp_missing;
Oid firstNS;
MemoryContext oldcxt;
* has already been accepted.) Don't make duplicate entries, either.
*/
oidlist = NIL;
+ temp_missing = false;
foreach(l, namelist)
{
char *curname = (char *) lfirst(l);
oidlist = lappendi(oidlist, namespaceId);
}
}
+ else if (strcmp(curname, "pg_temp") == 0)
+ {
+ /* pg_temp --- substitute temp namespace, if any */
+ if (OidIsValid(myTempNamespace))
+ {
+ if (!intMember(myTempNamespace, oidlist))
+ oidlist = lappendi(oidlist, myTempNamespace);
+ }
+ else
+ {
+ /* If it ought to be the creation namespace, set flag */
+ if (oidlist == NIL)
+ temp_missing = true;
+ }
+ }
else
{
/* normal namespace reference */
}
/*
- * Remember the first member of the explicit list.
+ * Remember the first member of the explicit list. (Note: this is
+ * nominally wrong if temp_missing, but we need it anyway to distinguish
+ * explicit from implicit mention of pg_catalog.)
*/
if (oidlist == NIL)
firstNS = InvalidOid;
*/
firstExplicitNamespace = firstNS;
if (OidIsValid(mySpecialNamespace))
+ {
defaultCreationNamespace = mySpecialNamespace;
+ /* don't have to create temp in this state */
+ tempCreationPending = false;
+ }
else
+ {
defaultCreationNamespace = firstNS;
+ tempCreationPending = temp_missing;
+ }
/* Mark the path valid. */
namespaceSearchPathValid = true;
char namespaceName[NAMEDATALEN];
Oid namespaceId;
+ Assert(!OidIsValid(myTempNamespace));
+
/*
* First, do permission check to see if we are authorized to make temp
* tables. We use a nonstandard error message here since
{
/*
* Verify that all the names are either valid namespace names or
- * "$user". We do not require $user to correspond to a valid
- * namespace. We do not check for USAGE rights, either; should
- * we?
+ * "$user" or "pg_temp". We do not require $user to correspond to a
+ * valid namespace, and pg_temp might not exist yet. We do not check
+ * for USAGE rights, either; should we?
*/
foreach(l, namelist)
{
if (strcmp(curname, "$user") == 0)
continue;
+ if (strcmp(curname, "pg_temp") == 0)
+ continue;
if (!SearchSysCacheExists(NAMESPACENAME,
CStringGetDatum(curname),
0, 0, 0))
MemoryContextSwitchTo(oldcxt);
defaultCreationNamespace = PG_CATALOG_NAMESPACE;
firstExplicitNamespace = PG_CATALOG_NAMESPACE;
+ tempCreationPending = false;
namespaceSearchPathValid = true;
namespaceUser = GetUserId();
}
* includeImplicit is true.
*
* NB: caller must treat the list as read-only!
+ *
+ * Note: calling this may result in a CommandCounterIncrement operation,
+ * if we have to create or clean out the temp namespace.
*/
List *
fetch_search_path(bool includeImplicit)
recomputeNamespacePath();
+ /*
+ * If the temp namespace should be first, force it to exist. This is
+ * so that callers can trust the result to reflect the actual default
+ * creation namespace. It's a bit bogus to do this here, since
+ * current_schema() is supposedly a stable function without side-effects,
+ * but the alternatives seem worse.
+ */
+ if (tempCreationPending)
+ {
+ InitTempTableNamespace();
+ recomputeNamespacePath();
+ }
+
result = namespaceSearchPath;
if (!includeImplicit)
{
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