@ -13,7 +13,7 @@
* Portions Copyright ( c ) 1994 , Regents of the University of California
*
* IDENTIFICATION
* $ Header : / cvsroot / pgsql / src / backend / catalog / namespace . c , v 1.4 2002 / 03 / 31 06 : 26 : 30 tgl Exp $
* $ Header : / cvsroot / pgsql / src / backend / catalog / namespace . c , v 1.5 2002 / 04 / 01 03 : 34 : 25 tgl Exp $
*
* - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
*/
@ -30,7 +30,9 @@
# include "miscadmin.h"
# include "nodes/makefuncs.h"
# include "storage/backendid.h"
# include "utils/builtins.h"
# include "utils/fmgroids.h"
# include "utils/guc.h"
# include "utils/lsyscache.h"
# include "utils/syscache.h"
@ -71,6 +73,12 @@ static Oid defaultCreationNamespace = PG_CATALOG_NAMESPACE;
*/
static Oid myTempNamespace = InvalidOid ;
/*
* This is the text equivalent of the search path - - - it ' s the value
* of the GUC variable ' search_path ' .
*/
char * namespace_search_path = NULL ;
/*
* Deletion ordering constraint item .
@ -702,3 +710,202 @@ RemoveTempRelationsCallback(void)
CommitTransactionCommand ( ) ;
}
}
/*
* Routines for handling the GUC variable ' search_path ' .
*/
/* parse_hook: is proposed value valid? */
bool
check_search_path ( const char * proposed )
{
char * rawname ;
List * namelist ;
List * l ;
/* Need a modifiable copy of string */
rawname = pstrdup ( proposed ) ;
/* Parse string into list of identifiers */
if ( ! SplitIdentifierString ( rawname , ' , ' , & namelist ) )
{
/* syntax error in name list */
pfree ( rawname ) ;
freeList ( namelist ) ;
return false ;
}
/*
* If we aren ' t inside a transaction , we cannot do database access so
* cannot verify the individual names . Must accept the list on faith .
* ( This case can happen , for example , when the postmaster reads a
* search_path setting from postgresql . conf . )
*/
if ( ! IsTransactionState ( ) )
{
pfree ( rawname ) ;
freeList ( namelist ) ;
return true ;
}
/*
* Verify that all the names are either valid namespace names or " $user " .
* ( We do not require $ user to correspond to a valid namespace ; should we ? )
*/
foreach ( l , namelist )
{
char * curname = ( char * ) lfirst ( l ) ;
if ( strcmp ( curname , " $user " ) = = 0 )
continue ;
if ( ! SearchSysCacheExists ( NAMESPACENAME ,
CStringGetDatum ( curname ) ,
0 , 0 , 0 ) )
{
pfree ( rawname ) ;
freeList ( namelist ) ;
return false ;
}
}
pfree ( rawname ) ;
freeList ( namelist ) ;
return true ;
}
/* assign_hook: do extra actions needed when assigning to search_path */
void
assign_search_path ( const char * newval )
{
char * rawname ;
List * namelist ;
List * oidlist ;
List * newpath ;
List * l ;
MemoryContext oldcxt ;
/*
* If we aren ' t inside a transaction , we cannot do database access so
* cannot look up the names . In this case , do nothing ; the internal
* search path will be fixed later by InitializeSearchPath . ( We assume
* this situation can only happen in the postmaster or early in backend
* startup . )
*/
if ( ! IsTransactionState ( ) )
return ;
/* Need a modifiable copy of string */
rawname = pstrdup ( newval ) ;
/* Parse string into list of identifiers */
if ( ! SplitIdentifierString ( rawname , ' , ' , & namelist ) )
{
/* syntax error in name list */
/* this should not happen if GUC checked check_search_path */
elog ( ERROR , " assign_search_path: invalid list syntax " ) ;
}
/*
* Convert the list of names to a list of OIDs . If any names are not
* recognizable , just leave them out of the list . ( This is our only
* reasonable recourse when the already - accepted default is bogus . )
*/
oidlist = NIL ;
foreach ( l , namelist )
{
char * curname = ( char * ) lfirst ( l ) ;
Oid namespaceId ;
if ( strcmp ( curname , " $user " ) = = 0 )
{
/* $user --- substitute namespace matching user name, if any */
HeapTuple tuple ;
tuple = SearchSysCache ( SHADOWSYSID ,
ObjectIdGetDatum ( GetSessionUserId ( ) ) ,
0 , 0 , 0 ) ;
if ( HeapTupleIsValid ( tuple ) )
{
char * uname ;
uname = NameStr ( ( ( Form_pg_shadow ) GETSTRUCT ( tuple ) ) - > usename ) ;
namespaceId = GetSysCacheOid ( NAMESPACENAME ,
CStringGetDatum ( uname ) ,
0 , 0 , 0 ) ;
if ( OidIsValid ( namespaceId ) )
oidlist = lappendi ( oidlist , namespaceId ) ;
ReleaseSysCache ( tuple ) ;
}
}
else
{
/* normal namespace reference */
namespaceId = GetSysCacheOid ( NAMESPACENAME ,
CStringGetDatum ( curname ) ,
0 , 0 , 0 ) ;
if ( OidIsValid ( namespaceId ) )
oidlist = lappendi ( oidlist , namespaceId ) ;
}
}
/*
* Now that we ' ve successfully built the new list of namespace OIDs ,
* save it in permanent storage .
*/
oldcxt = MemoryContextSwitchTo ( TopMemoryContext ) ;
newpath = listCopy ( oidlist ) ;
MemoryContextSwitchTo ( oldcxt ) ;
/* Now safe to assign to state variable. */
freeList ( namespaceSearchPath ) ;
namespaceSearchPath = newpath ;
/*
* Update info derived from search path .
*/
pathContainsSystemNamespace = intMember ( PG_CATALOG_NAMESPACE ,
namespaceSearchPath ) ;
if ( namespaceSearchPath = = NIL )
defaultCreationNamespace = PG_CATALOG_NAMESPACE ;
else
defaultCreationNamespace = ( Oid ) lfirsti ( namespaceSearchPath ) ;
/* Clean up. */
pfree ( rawname ) ;
freeList ( namelist ) ;
freeList ( oidlist ) ;
}
/*
* InitializeSearchPath : initialize module during InitPostgres .
*
* This is called after we are up enough to be able to do catalog lookups .
*/
void
InitializeSearchPath ( void )
{
/*
* In normal multi - user mode , we want the default search path to be
* ' $ user , public ' ( or as much of that as exists , anyway ; see the
* error handling in assign_search_path ) ; which is what guc . c has as
* the wired - in default value . But in bootstrap or standalone - backend
* mode , the default search path must be empty so that initdb correctly
* creates everything in PG_CATALOG_NAMESPACE . Accordingly , adjust the
* default setting if we are not running under postmaster . ( If a
* non - default setting has been supplied , this will not overwrite it . )
*/
if ( ! IsUnderPostmaster )
{
SetConfigOption ( " search_path " , " " ,
PGC_POSTMASTER , PGC_S_DEFAULT ) ;
}
/*
* If a search path setting was provided before we were able to execute
* lookups , establish the internal search path now .
*/
if ( namespace_search_path & & * namespace_search_path & &
namespaceSearchPath = = NIL )
assign_search_path ( namespace_search_path ) ;
}
Tom Lane
24 years ago