Fix another oversight in logging of changes in postgresql.conf settings.

We were using GetConfigOption to collect the old value of each setting,
overlooking the possibility that it didn't exist yet.  This does happen
in the case of adding a new entry within a custom variable class, as
exhibited in bug #6097 from Maxim Boguk.

To fix, add a missing_ok parameter to GetConfigOption, but only in 9.1
and HEAD --- it seems possible that some third-party code is using that
function, so changing its API in a minor release would cause problems.
In 9.0, create a near-duplicate function instead.

src/backend/utils/misc/guc-file.l

@@ -317,9 +317,9 @@ ProcessConfigFile(GucContext context)
 		/* In SIGHUP cases in the postmaster, report changes */
 		if (context == PGC_SIGHUP && !IsUnderPostmaster)
 		{
-			const char *preval = GetConfigOption(item->name, false);
+			const char *preval = GetConfigOptionNoError(item->name);
 
-			/* string variables could be NULL; treat that as empty */
+			/* If option doesn't exist yet or is NULL, treat as empty string */
 			if (!preval)
 				preval = "";
 			/* must dup, else might have dangling pointer below */
@@ -334,7 +334,7 @@ ProcessConfigFile(GucContext context)
 
 			if (pre_value)
 			{
-				const char *post_value = GetConfigOption(item->name, false);
+				const char *post_value = GetConfigOptionNoError(item->name);
 
 				if (!post_value)
 					post_value = "";

src/backend/utils/misc/guc.c

@@ -5391,6 +5391,46 @@ GetConfigOption(const char *name, bool restrict_superuser)
 	return NULL;
 }
 
+/*
+ * As above, but return NULL if no such option.
+ * (This is a stopgap to avoid changing GetConfigOption's API within the
+ * 9.0.x release series.)
+ */
+const char *
+GetConfigOptionNoError(const char *name)
+{
+	struct config_generic *record;
+	static char buffer[256];
+
+	record = find_option(name, false, ERROR);
+	if (record == NULL)
+		return NULL;
+
+	switch (record->vartype)
+	{
+		case PGC_BOOL:
+			return *((struct config_bool *) record)->variable ? "on" : "off";
+
+		case PGC_INT:
+			snprintf(buffer, sizeof(buffer), "%d",
+					 *((struct config_int *) record)->variable);
+			return buffer;
+
+		case PGC_REAL:
+			snprintf(buffer, sizeof(buffer), "%g",
+					 *((struct config_real *) record)->variable);
+			return buffer;
+
+		case PGC_STRING:
+			return *((struct config_string *) record)->variable;
+
+		case PGC_ENUM:
+			return config_enum_lookup_by_value((struct config_enum *) record,
+								 *((struct config_enum *) record)->variable);
+	}
+	return NULL;
+}
+
 /*
  * Get the RESET value associated with the given option.
  *

src/include/utils/guc.h

@@ -253,6 +253,7 @@ extern void DefineCustomEnumVariable(
 extern void EmitWarningsOnPlaceholders(const char *className);
 
 extern const char *GetConfigOption(const char *name, bool restrict_superuser);
+extern const char *GetConfigOptionNoError(const char *name);
 extern const char *GetConfigOptionResetString(const char *name);
 extern void ProcessConfigFile(GucContext context);
 extern void InitializeGUCOptions(void);