Repair problem identified by Olivier Prenant: ALTER DATABASE SET search_path

should not be too eager to reject paths involving unknown schemas, since
it can't really tell whether the schemas exist in the target database.
(Also, when reading pg_dumpall output, it could be that the schemas
don't exist yet, but eventually will.)  ALTER USER SET has a similar issue.
So, reduce the normal ERROR to a NOTICE when checking search_path values
for these commands.  Supporting this requires changing the API for GUC
assign_hook functions, which causes the patch to touch a lot of places,
but the changes are conceptually trivial.

src/backend/access/transam/xlog.c

@@ -7,7 +7,7 @@
  * Portions Copyright (c) 1996-2003, PostgreSQL Global Development Group
  * Portions Copyright (c) 1994, Regents of the University of California
  *
- * $PostgreSQL: pgsql/src/backend/access/transam/xlog.c,v 1.131 2004/01/06 22:22:37 tgl Exp $
+ * $PostgreSQL: pgsql/src/backend/access/transam/xlog.c,v 1.132 2004/01/19 19:04:40 tgl Exp $
  *
  *-------------------------------------------------------------------------
  */
@@ -3523,7 +3523,7 @@ xlog_outrec(char *buf, XLogRecord *record)
  * GUC support
  */
 const char *
-assign_xlog_sync_method(const char *method, bool doit, bool interactive)
+assign_xlog_sync_method(const char *method, bool doit, GucSource source)
 {
 	int			new_sync_method;
 	int			new_sync_bit;

src/backend/catalog/namespace.c

@@ -13,7 +13,7 @@
  * Portions Copyright (c) 1994, Regents of the University of California
  *
  * IDENTIFICATION
- *	  $PostgreSQL: pgsql/src/backend/catalog/namespace.c,v 1.61 2003/12/29 21:33:09 tgl Exp $
+ *	  $PostgreSQL: pgsql/src/backend/catalog/namespace.c,v 1.62 2004/01/19 19:04:40 tgl Exp $
  *
  *-------------------------------------------------------------------------
  */
@@ -39,6 +39,7 @@
 #include "utils/acl.h"
 #include "utils/builtins.h"
 #include "utils/catcache.h"
+#include "utils/guc.h"
 #include "utils/inval.h"
 #include "utils/lsyscache.h"
 #include "utils/memutils.h"
@@ -1773,7 +1774,7 @@ RemoveTempRelationsCallback(int code, Datum arg)
 
 /* assign_hook: validate new search_path, do extra actions as needed */
 const char *
-assign_search_path(const char *newval, bool doit, bool interactive)
+assign_search_path(const char *newval, bool doit, GucSource source)
 {
 	char	   *rawname;
 	List	   *namelist;
@@ -1795,13 +1796,19 @@ assign_search_path(const char *newval, bool doit, bool interactive)
 	 * If we aren't inside a transaction, we cannot do database access so
 	 * cannot verify the individual names.	Must accept the list on faith.
 	 */
-	if (interactive && IsTransactionState())
+	if (source >= PGC_S_INTERACTIVE && IsTransactionState())
 	{
 		/*
 		 * 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?
+		 *
+		 * When source == PGC_S_TEST, we are checking the argument of an
+		 * ALTER DATABASE SET or ALTER USER SET command.  It could be that
+		 * the intended use of the search path is for some other database,
+		 * so we should not error out if it mentions schemas not present
+		 * in the current database.  We reduce the message to NOTICE instead.
 		 */
 		foreach(l, namelist)
 		{
@@ -1812,7 +1819,7 @@ assign_search_path(const char *newval, bool doit, bool interactive)
 			if (!SearchSysCacheExists(NAMESPACENAME,
 									  CStringGetDatum(curname),
 									  0, 0, 0))
-				ereport(ERROR,
+				ereport((source == PGC_S_TEST) ? NOTICE : ERROR,
 						(errcode(ERRCODE_UNDEFINED_SCHEMA),
 					   errmsg("schema \"%s\" does not exist", curname)));
 		}

src/backend/commands/variable.c

@@ -9,7 +9,7 @@
  *
  *
  * IDENTIFICATION
- *	  $PostgreSQL: pgsql/src/backend/commands/variable.c,v 1.92 2003/12/21 04:34:35 momjian Exp $
+ *	  $PostgreSQL: pgsql/src/backend/commands/variable.c,v 1.93 2004/01/19 19:04:40 tgl Exp $
  *
  *-------------------------------------------------------------------------
  */
@@ -48,7 +48,7 @@ extern char *tzname[];
  * assign_datestyle: GUC assign_hook for datestyle
  */
 const char *
-assign_datestyle(const char *value, bool doit, bool interactive)
+assign_datestyle(const char *value, bool doit, GucSource source)
 {
 	int			newDateStyle = DateStyle;
 	int			newDateOrder = DateOrder;
@@ -69,7 +69,7 @@ assign_datestyle(const char *value, bool doit, bool interactive)
 		/* syntax error in list */
 		pfree(rawstring);
 		freeList(elemlist);
-		if (interactive)
+		if (source >= PGC_S_INTERACTIVE)
 			ereport(ERROR,
 					(errcode(ERRCODE_INVALID_PARAMETER_VALUE),
 					 errmsg("invalid list syntax for parameter \"datestyle\"")));
@@ -137,7 +137,7 @@ assign_datestyle(const char *value, bool doit, bool interactive)
 			const char *subval;
 
 			subval = assign_datestyle(GetConfigOptionResetString("datestyle"),
-									  true, interactive);
+									  true, source);
 			if (scnt == 0)
 				newDateStyle = DateStyle;
 			if (ocnt == 0)
@@ -155,7 +155,7 @@ assign_datestyle(const char *value, bool doit, bool interactive)
 		}
 		else
 		{
-			if (interactive)
+			if (source >= PGC_S_INTERACTIVE)
 				ereport(ERROR,
 						(errcode(ERRCODE_INVALID_PARAMETER_VALUE),
 						 errmsg("unrecognized \"datestyle\" key word: \"%s\"",
@@ -173,7 +173,7 @@ assign_datestyle(const char *value, bool doit, bool interactive)
 
 	if (!ok)
 	{
-		if (interactive)
+		if (source >= PGC_S_INTERACTIVE)
 			ereport(ERROR,
 					(errcode(ERRCODE_INVALID_PARAMETER_VALUE),
 					 errmsg("conflicting \"datestyle\" specifications")));
@@ -386,7 +386,7 @@ tz_acceptable(void)
  * assign_timezone: GUC assign_hook for timezone
  */
 const char *
-assign_timezone(const char *value, bool doit, bool interactive)
+assign_timezone(const char *value, bool doit, GucSource source)
 {
 	char	   *result;
 	char	   *endptr;
@@ -444,7 +444,7 @@ assign_timezone(const char *value, bool doit, bool interactive)
 		pfree(val);
 		if (interval->month != 0)
 		{
-			if (interactive)
+			if (source >= PGC_S_INTERACTIVE)
 				ereport(ERROR,
 						(errcode(ERRCODE_INVALID_PARAMETER_VALUE),
 						 errmsg("invalid interval value for time zone: month not allowed")));
@@ -552,7 +552,7 @@ assign_timezone(const char *value, bool doit, bool interactive)
 				/* Complain if it was bad */
 				if (!known)
 				{
-					ereport(interactive ? ERROR : LOG,
+					ereport((source >= PGC_S_INTERACTIVE) ? ERROR : LOG,
 							(errcode(ERRCODE_INVALID_PARAMETER_VALUE),
 							 errmsg("unrecognized time zone name: \"%s\"",
 									value)));
@@ -560,7 +560,7 @@ assign_timezone(const char *value, bool doit, bool interactive)
 				}
 				if (!acceptable)
 				{
-					ereport(interactive ? ERROR : LOG,
+					ereport((source >= PGC_S_INTERACTIVE) ? ERROR : LOG,
 							(errcode(ERRCODE_INVALID_PARAMETER_VALUE),
 					errmsg("time zone \"%s\" appears to use leap seconds",
 						   value),
@@ -628,9 +628,9 @@ show_timezone(void)
  */
 
 const char *
-assign_XactIsoLevel(const char *value, bool doit, bool interactive)
+assign_XactIsoLevel(const char *value, bool doit, GucSource source)
 {
-	if (doit && interactive && SerializableSnapshot != NULL)
+	if (doit && source >= PGC_S_INTERACTIVE && SerializableSnapshot != NULL)
 		ereport(ERROR,
 				(errcode(ERRCODE_ACTIVE_SQL_TRANSACTION),
 				 errmsg("SET TRANSACTION ISOLATION LEVEL must be called before any query")));
@@ -690,10 +690,10 @@ show_XactIsoLevel(void)
  */
 
 bool
-assign_random_seed(double value, bool doit, bool interactive)
+assign_random_seed(double value, bool doit, GucSource source)
 {
 	/* Can't really roll back on error, so ignore non-interactive setting */
-	if (doit && interactive)
+	if (doit && source >= PGC_S_INTERACTIVE)
 		DirectFunctionCall1(setseed, Float8GetDatum(value));
 	return true;
 }
@@ -710,7 +710,7 @@ show_random_seed(void)
  */
 
 const char *
-assign_client_encoding(const char *value, bool doit, bool interactive)
+assign_client_encoding(const char *value, bool doit, GucSource source)
 {
 	int			encoding;
 
@@ -726,7 +726,7 @@ assign_client_encoding(const char *value, bool doit, bool interactive)
 	 */
 	if (SetClientEncoding(encoding, doit) < 0)
 	{
-		if (interactive)
+		if (source >= PGC_S_INTERACTIVE)
 			ereport(ERROR,
 					(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
 				  errmsg("conversion between %s and %s is not supported",
@@ -748,7 +748,7 @@ assign_client_encoding(const char *value, bool doit, bool interactive)
  * because of the NAMEDATALEN limit on names.
  */
 const char *
-assign_session_authorization(const char *value, bool doit, bool interactive)
+assign_session_authorization(const char *value, bool doit, GucSource source)
 {
 	AclId		usesysid = 0;
 	bool		is_superuser = false;
@@ -791,7 +791,7 @@ assign_session_authorization(const char *value, bool doit, bool interactive)
 								 0, 0, 0);
 		if (!HeapTupleIsValid(userTup))
 		{
-			if (interactive)
+			if (source >= PGC_S_INTERACTIVE)
 				ereport(ERROR,
 						(errcode(ERRCODE_UNDEFINED_OBJECT),
 						 errmsg("user \"%s\" does not exist", value)));

src/backend/utils/adt/datetime.c

@@ -8,7 +8,7 @@
  *
  *
  * IDENTIFICATION
- *	  $PostgreSQL: pgsql/src/backend/utils/adt/datetime.c,v 1.123 2003/12/21 04:34:35 momjian Exp $
+ *	  $PostgreSQL: pgsql/src/backend/utils/adt/datetime.c,v 1.124 2004/01/19 19:04:40 tgl Exp $
  *
  *-------------------------------------------------------------------------
  */
@@ -3919,7 +3919,7 @@ EncodeInterval(struct tm * tm, fsec_t fsec, int style, char *str)
 
 /* GUC assign_hook for australian_timezones */
 bool
-ClearDateCache(bool newval, bool doit, bool interactive)
+ClearDateCache(bool newval, bool doit, GucSource source)
 {
 	int			i;
 

src/backend/utils/adt/pg_locale.c

@@ -4,7 +4,7 @@
  *
  * Portions Copyright (c) 2002-2003, PostgreSQL Global Development Group
  *
- * $PostgreSQL: pgsql/src/backend/utils/adt/pg_locale.c,v 1.24 2003/11/29 19:51:59 pgsql Exp $
+ * $PostgreSQL: pgsql/src/backend/utils/adt/pg_locale.c,v 1.25 2004/01/19 19:04:40 tgl Exp $
  *
  *-----------------------------------------------------------------------
  */
@@ -73,7 +73,7 @@ char	   *locale_time;
  * valid.  (See explanation at the top of this file.)
  */
 static const char *
-locale_xxx_assign(int category, const char *value, bool doit, bool interactive)
+locale_xxx_assign(int category, const char *value, bool doit, GucSource source)
 {
 	char	   *save;
 
@@ -99,21 +99,21 @@ locale_xxx_assign(int category, const char *value, bool doit, bool interactive)
 
 
 const char *
-locale_monetary_assign(const char *value, bool doit, bool interactive)
+locale_monetary_assign(const char *value, bool doit, GucSource source)
 {
-	return locale_xxx_assign(LC_MONETARY, value, doit, interactive);
+	return locale_xxx_assign(LC_MONETARY, value, doit, source);
 }
 
 const char *
-locale_numeric_assign(const char *value, bool doit, bool interactive)
+locale_numeric_assign(const char *value, bool doit, GucSource source)
 {
-	return locale_xxx_assign(LC_NUMERIC, value, doit, interactive);
+	return locale_xxx_assign(LC_NUMERIC, value, doit, source);
 }
 
 const char *
-locale_time_assign(const char *value, bool doit, bool interactive)
+locale_time_assign(const char *value, bool doit, GucSource source)
 {
-	return locale_xxx_assign(LC_TIME, value, doit, interactive);
+	return locale_xxx_assign(LC_TIME, value, doit, source);
 }
 
 
@@ -121,7 +121,7 @@ locale_time_assign(const char *value, bool doit, bool interactive)
  * We allow LC_MESSAGES to actually be set globally.
  */
 const char *
-locale_messages_assign(const char *value, bool doit, bool interactive)
+locale_messages_assign(const char *value, bool doit, GucSource source)
 {
 	/*
 	 * LC_MESSAGES category does not exist everywhere, but accept it
@@ -134,7 +134,7 @@ locale_messages_assign(const char *value, bool doit, bool interactive)
 			return NULL;
 	}
 	else
-		value = locale_xxx_assign(LC_MESSAGES, value, false, interactive);
+		value = locale_xxx_assign(LC_MESSAGES, value, false, source);
 #endif
 	return value;
 }

src/backend/utils/adt/regexp.c

@@ -8,7 +8,7 @@
  *
  *
  * IDENTIFICATION
- *	  $PostgreSQL: pgsql/src/backend/utils/adt/regexp.c,v 1.50 2003/11/29 19:51:59 pgsql Exp $
+ *	  $PostgreSQL: pgsql/src/backend/utils/adt/regexp.c,v 1.51 2004/01/19 19:04:40 tgl Exp $
  *
  *		Alistair Crooks added the code for the regex caching
  *		agc - cached the regular expressions used - there's a good chance
@@ -32,6 +32,7 @@
 #include "regex/regex.h"
 #include "mb/pg_wchar.h"
 #include "utils/builtins.h"
+#include "utils/guc.h"
 
 
 /* GUC-settable flavor parameter */
@@ -229,7 +230,7 @@ RE_compile_and_execute(text *text_re, unsigned char *dat, int dat_len,
  */
 const char *
 assign_regex_flavor(const char *value,
-					bool doit, bool interactive)
+					bool doit, GucSource source)
 {
 	if (strcasecmp(value, "advanced") == 0)
 	{

src/backend/utils/misc/README

-$PostgreSQL: pgsql/src/backend/utils/misc/README,v 1.3 2003/11/29 19:52:03 pgsql Exp $
+$PostgreSQL: pgsql/src/backend/utils/misc/README,v 1.4 2004/01/19 19:04:40 tgl Exp $
 
 
 GUC IMPLEMENTATION NOTES
@@ -19,29 +19,30 @@ to change when a GUC variable is set.  Show hooks are used to modify
 the default SHOW display for a variable.
 
 If an assign_hook is provided, it points to a function of the signature
-	bool assign_hook(newvalue, bool doit, bool interactive)
-where the type of 'newvalue' matches the kind of variable.  This function
+	bool assign_hook(newvalue, bool doit, GucSource source)
+where the type of "newvalue" matches the kind of variable.  This function
 is called immediately before actually setting the variable's value (so it
 can look at the actual variable to determine the old value).  If the
 function returns "true" then the assignment is completed; if it returns
 "false" then newvalue is considered invalid and the assignment is not
 performed.  If "doit" is false then the function should simply check
-validity of newvalue and not change any derived state.  "interactive" is
-true when we are performing a SET command; in this case it is okay for the
-assign_hook to raise an error via elog().  If the function returns false
-for an interactive assignment then guc.c will report a generic "invalid
-value" error message.  (An internal elog() in an assign_hook is only
-needed if you want to generate a specialized error message.)  But when
-"interactive" is false we are reading a non-interactive option source,
-such as postgresql.conf.  In this case the assign_hook should *not* elog
-but should just return false if it doesn't like the newvalue.  (An
-elog(LOG) call would be acceptable if you feel a need for a custom
-complaint in this situation.)
+validity of newvalue and not change any derived state.  The "source" parameter
+indicates where the new value came from.  If it is >= PGC_S_INTERACTIVE,
+then we are performing an interactive assignment (e.g., a SET command).
+In such cases it is okay for the assign_hook to raise an error via ereport().
+If the function returns false for an interactive assignment then guc.c will
+report a generic "invalid value" error message.  (An internal ereport() in
+an assign_hook is only needed if you want to generate a specialized error
+message.)  But when source < PGC_S_INTERACTIVE, we are reading a
+non-interactive option source, such as postgresql.conf.  In this case the
+assign_hook should *not* ereport but should just return false if it doesn't
+like the newvalue.  (An ereport(LOG) call would be acceptable if you feel a
+need for a custom complaint in this situation.)
 
 For string variables, the signature for assign hooks is a bit different:
 	const char *assign_hook(const char *newvalue,
 				bool doit,
-				bool interactive)
+				GucSource source)
 The meanings of the parameters are the same as for the other types of GUC
 variables, but the return value is handled differently:
 	NULL --- assignment fails (like returning false for other datatypes)

src/include/access/xlog.h

@@ -6,7 +6,7 @@
  * Portions Copyright (c) 1996-2003, PostgreSQL Global Development Group
  * Portions Copyright (c) 1994, Regents of the University of California
  *
- * $PostgreSQL: pgsql/src/include/access/xlog.h,v 1.47 2004/01/06 17:26:23 neilc Exp $
+ * $PostgreSQL: pgsql/src/include/access/xlog.h,v 1.48 2004/01/19 19:04:40 tgl Exp $
  */
 #ifndef XLOG_H
 #define XLOG_H
@@ -222,7 +222,4 @@ extern XLogRecPtr GetRedoRecPtr(void);
  */
 extern XLogRecPtr GetUndoRecPtr(void);
 
-extern const char *assign_xlog_sync_method(const char *method,
-						bool doit, bool interactive);
-
 #endif   /* XLOG_H */

src/include/catalog/namespace.h

@@ -7,7 +7,7 @@
  * Portions Copyright (c) 1996-2003, PostgreSQL Global Development Group
  * Portions Copyright (c) 1994, Regents of the University of California
  *
- * $PostgreSQL: pgsql/src/include/catalog/namespace.h,v 1.29 2003/11/29 22:40:58 pgsql Exp $
+ * $PostgreSQL: pgsql/src/include/catalog/namespace.h,v 1.30 2004/01/19 19:04:40 tgl Exp $
  *
  *-------------------------------------------------------------------------
  */
@@ -95,9 +95,6 @@ extern void AtEOXact_Namespace(bool isCommit);
 /* stuff for search_path GUC variable */
 extern char *namespace_search_path;
 
-extern const char *assign_search_path(const char *newval,
-				   bool doit, bool interactive);
-
 extern List *fetch_search_path(bool includeImplicit);
 
 #endif   /* NAMESPACE_H */

src/include/commands/variable.h

@@ -2,27 +2,32 @@
  * variable.h
  *		Routines for handling specialized SET variables.
  *
- * $PostgreSQL: pgsql/src/include/commands/variable.h,v 1.22 2003/11/29 22:40:59 pgsql Exp $
+ * Portions Copyright (c) 1996-2003, PostgreSQL Global Development Group
+ * Portions Copyright (c) 1994, Regents of the University of California
  *
+ * $PostgreSQL: pgsql/src/include/commands/variable.h,v 1.23 2004/01/19 19:04:40 tgl Exp $
  */
 #ifndef VARIABLE_H
 #define VARIABLE_H
 
+#include "utils/guc.h"
+
+
 extern const char *assign_datestyle(const char *value,
-				 bool doit, bool interactive);
+				 bool doit, GucSource source);
 extern const char *assign_timezone(const char *value,
-				bool doit, bool interactive);
+				bool doit, GucSource source);
 extern const char *show_timezone(void);
 extern const char *assign_XactIsoLevel(const char *value,
-					bool doit, bool interactive);
+					bool doit, GucSource source);
 extern const char *show_XactIsoLevel(void);
 extern bool assign_random_seed(double value,
-				   bool doit, bool interactive);
+				   bool doit, GucSource source);
 extern const char *show_random_seed(void);
 extern const char *assign_client_encoding(const char *value,
-					   bool doit, bool interactive);
+					   bool doit, GucSource source);
 extern const char *assign_session_authorization(const char *value,
-							 bool doit, bool interactive);
+							 bool doit, GucSource source);
 extern const char *show_session_authorization(void);
 
 #endif   /* VARIABLE_H */

src/include/utils/builtins.h

@@ -7,7 +7,7 @@
  * Portions Copyright (c) 1996-2003, PostgreSQL Global Development Group
  * Portions Copyright (c) 1994, Regents of the University of California
  *
- * $PostgreSQL: pgsql/src/include/utils/builtins.h,v 1.232 2003/12/01 23:12:16 momjian Exp $
+ * $PostgreSQL: pgsql/src/include/utils/builtins.h,v 1.233 2004/01/19 19:04:40 tgl Exp $
  *
  *-------------------------------------------------------------------------
  */
@@ -16,7 +16,6 @@
 
 #include "fmgr.h"
 #include "nodes/parsenodes.h"
-#include "storage/itemptr.h"	/* for setLastTid() */
 
 /*
  *		Defined in adt/
@@ -415,8 +414,6 @@ extern Datum texticregexeq(PG_FUNCTION_ARGS);
 extern Datum texticregexne(PG_FUNCTION_ARGS);
 extern Datum textregexsubstr(PG_FUNCTION_ARGS);
 extern Datum similar_escape(PG_FUNCTION_ARGS);
-extern const char *assign_regex_flavor(const char *value,
-					bool doit, bool interactive);
 
 /* regproc.c */
 extern Datum regprocin(PG_FUNCTION_ARGS);
@@ -483,7 +480,6 @@ extern Datum tidsend(PG_FUNCTION_ARGS);
 extern Datum tideq(PG_FUNCTION_ARGS);
 extern Datum currtid_byreloid(PG_FUNCTION_ARGS);
 extern Datum currtid_byrelname(PG_FUNCTION_ARGS);
-extern void setLastTid(const ItemPointer tid);
 
 /* varchar.c */
 extern Datum bpcharin(PG_FUNCTION_ARGS);

src/include/utils/datetime.h

@@ -9,7 +9,7 @@
  * Portions Copyright (c) 1996-2003, PostgreSQL Global Development Group
  * Portions Copyright (c) 1994, Regents of the University of California
  *
- * $PostgreSQL: pgsql/src/include/utils/datetime.h,v 1.46 2003/11/29 22:41:15 pgsql Exp $
+ * $PostgreSQL: pgsql/src/include/utils/datetime.h,v 1.47 2004/01/19 19:04:40 tgl Exp $
  *
  *-------------------------------------------------------------------------
  */
@@ -318,7 +318,6 @@ extern int	EncodeInterval(struct tm * tm, fsec_t fsec, int style, char *str);
 
 extern int	DecodeSpecial(int field, char *lowtoken, int *val);
 extern int	DecodeUnits(int field, char *lowtoken, int *val);
-extern bool ClearDateCache(bool newval, bool doit, bool interactive);
 
 extern int	j2day(int jd);
 

src/include/utils/guc.h

@@ -7,7 +7,7 @@
  * Copyright (c) 2000-2003, PostgreSQL Global Development Group
  * Written by Peter Eisentraut <peter_e@gmx.net>.
  *
- * $PostgreSQL: pgsql/src/include/utils/guc.h,v 1.43 2003/12/01 22:08:02 momjian Exp $
+ * $PostgreSQL: pgsql/src/include/utils/guc.h,v 1.44 2004/01/19 19:04:40 tgl Exp $
  *--------------------------------------------------------------------
  */
 #ifndef GUC_H
@@ -76,6 +76,15 @@ typedef enum
  *
  * PGC_S_UNPRIVILEGED isn't actually a source value, but the dividing line
  * between privileged and unprivileged sources for USERLIMIT purposes.
+ * Similarly, PGC_S_INTERACTIVE isn't a real source value, but is the
+ * dividing line between "interactive" and "non-interactive" sources for
+ * error reporting purposes.
+ *
+ * PGC_S_TEST is used when testing values to be stored as per-database or
+ * per-user defaults ("doit" will always be false, so this never gets stored
+ * as the actual source of any value).  This is an interactive case, but
+ * it needs its own source value because some assign hooks need to make
+ * different validity checks in this case.
  */
 typedef enum
 {
@@ -88,6 +97,8 @@ typedef enum
 	PGC_S_USER,					/* per-user setting */
 	PGC_S_CLIENT,				/* from client connection request */
 	PGC_S_OVERRIDE,				/* special case to forcibly set default */
+	PGC_S_INTERACTIVE,			/* dividing line for error reporting */
+	PGC_S_TEST,					/* test per-database or per-user setting */
 	PGC_S_SESSION				/* SET command */
 } GucSource;
 
@@ -152,4 +163,22 @@ void		write_nondefault_variables(GucContext context);
 void		read_nondefault_variables(void);
 #endif
 
+/*
+ * The following functions are not in guc.c, but are declared here to avoid
+ * having to include guc.h in some widely used headers that it really doesn't
+ * belong in.
+ */
+
+/* in utils/adt/datetime.c */
+extern bool ClearDateCache(bool newval, bool doit, GucSource source);
+/* in utils/adt/regexp.c */
+extern const char *assign_regex_flavor(const char *value,
+					bool doit, GucSource source);
+/* in catalog/namespace.c */
+extern const char *assign_search_path(const char *newval,
+				   bool doit, GucSource source);
+/* in access/transam/xlog.c */
+extern const char *assign_xlog_sync_method(const char *method,
+						bool doit, GucSource source);
+
 #endif   /* GUC_H */

src/include/utils/guc_tables.h

@@ -7,7 +7,7 @@
  *
  * Portions Copyright (c) 1996-2003, PostgreSQL Global Development Group
  *
- *	  $PostgreSQL: pgsql/src/include/utils/guc_tables.h,v 1.8 2003/12/03 18:52:00 joe Exp $
+ *	  $PostgreSQL: pgsql/src/include/utils/guc_tables.h,v 1.9 2004/01/19 19:04:40 tgl Exp $
  *
  *-------------------------------------------------------------------------
  */
@@ -113,7 +113,7 @@ struct config_bool
 	/* (all but reset_val are constants) */
 	bool	   *variable;
 	bool		reset_val;
-	bool		(*assign_hook) (bool newval, bool doit, bool interactive);
+	bool		(*assign_hook) (bool newval, bool doit, GucSource source);
 	const char *(*show_hook) (void);
 	/* variable fields, initialized at runtime: */
 	bool		session_val;
@@ -129,7 +129,7 @@ struct config_int
 	int			reset_val;
 	int			min;
 	int			max;
-	bool		(*assign_hook) (int newval, bool doit, bool interactive);
+	bool		(*assign_hook) (int newval, bool doit, GucSource source);
 	const char *(*show_hook) (void);
 	/* variable fields, initialized at runtime: */
 	int			session_val;
@@ -145,7 +145,7 @@ struct config_real
 	double		reset_val;
 	double		min;
 	double		max;
-	bool		(*assign_hook) (double newval, bool doit, bool interactive);
+	bool		(*assign_hook) (double newval, bool doit, GucSource source);
 	const char *(*show_hook) (void);
 	/* variable fields, initialized at runtime: */
 	double		session_val;
@@ -159,7 +159,7 @@ struct config_string
 	/* (all are constants) */
 	char	  **variable;
 	const char *boot_val;
-	const char *(*assign_hook) (const char *newval, bool doit, bool interactive);
+	const char *(*assign_hook) (const char *newval, bool doit, GucSource source);
 	const char *(*show_hook) (void);
 	/* variable fields, initialized at runtime: */
 	char	   *reset_val;

src/include/utils/pg_locale.h

@@ -2,7 +2,7 @@
  *
  * PostgreSQL locale utilities
  *
- * $PostgreSQL: pgsql/src/include/utils/pg_locale.h,v 1.16 2003/11/29 22:41:16 pgsql Exp $
+ * $PostgreSQL: pgsql/src/include/utils/pg_locale.h,v 1.17 2004/01/19 19:04:40 tgl Exp $
  *
  * Copyright (c) 2002-2003, PostgreSQL Global Development Group
  *
@@ -14,19 +14,22 @@
 
 #include <locale.h>
 
+#include "utils/guc.h"
+
+
 extern char *locale_messages;
 extern char *locale_monetary;
 extern char *locale_numeric;
 extern char *locale_time;
 
 extern const char *locale_messages_assign(const char *value,
-					   bool doit, bool interactive);
+					   bool doit, GucSource source);
 extern const char *locale_monetary_assign(const char *value,
-					   bool doit, bool interactive);
+					   bool doit, GucSource source);
 extern const char *locale_numeric_assign(const char *value,
-					  bool doit, bool interactive);
+					  bool doit, GucSource source);
 extern const char *locale_time_assign(const char *value,
-				   bool doit, bool interactive);
+				   bool doit, GucSource source);
 
 extern bool lc_collate_is_c(void);
 

src/interfaces/ecpg/pgtypeslib/dt.h

@@ -298,7 +298,6 @@ int			EncodeInterval(struct tm * tm, fsec_t fsec, int style, char *str);
 int			tm2timestamp(struct tm *, fsec_t, int *, timestamp *);
 
 int			DecodeUnits(int field, char *lowtoken, int *val);
-bool		ClearDateCache(bool, bool, bool);
 
 bool		CheckDateTokenTables(void);