Andrew Dunstan wrote:
Zdenek Kotala wrote:
There is path implements following item from todo list: "Allow commenting of variables in postgresql.conf to restore them to defaults".
Main idea is:

General config structure is extend with default_val attribute to keep really default value. (There is small conflict - for string boot_val has same meaning). During reconfiguration all values which has reset source equal with PGC_S_FILE are revert back to really default values. New values from configuration files are set after this step and commented variables stay with default value.


Please resubmit your patch as a context diff, as documented here: http://www.postgresql.org/docs/faqs.FAQ_DEV.html#item1.5

cheers

andrew
I am sorry. Here it is:



Index: src/backend/utils/misc/guc-file.l
===================================================================
RCS file: /projects/cvsroot/pgsql/src/backend/utils/misc/guc-file.l,v
retrieving revision 1.37
diff -c -r1.37 guc-file.l
*** src/backend/utils/misc/guc-file.l    7 Mar 2006 01:03:12 -0000    1.37
--- src/backend/utils/misc/guc-file.l    24 May 2006 14:10:12 -0000
***************
*** 112,119 ****
 void
 ProcessConfigFile(GucContext context)
 {
!     int            elevel;
     struct name_value_pair *item, *head, *tail;

     Assert(context == PGC_POSTMASTER || context == PGC_SIGHUP);

--- 112,120 ----
 void
 ProcessConfigFile(GucContext context)
 {
!     int            elevel, i;
     struct name_value_pair *item, *head, *tail;
+     char       *env;

     Assert(context == PGC_POSTMASTER || context == PGC_SIGHUP);

***************
*** 143,148 ****
--- 144,185 ----
             goto cleanup_list;
     }

+     /* Revert all options with reset source PGC_S_FILE to default value.
+ * This implementation is easier then iplementing some change flag and verify + * what realy was commented out. + * XXX When log_line_prefix is set in configuration file then log output
+      * is not correct during this phase - prefix is revert to empty value.
+      */
+     for (i = 0; i < num_guc_variables; i++)
+     {
+         struct config_generic *gconf = guc_variables[i];
+         if ( gconf->reset_source == PGC_S_FILE )
+         {
+             set_config_option(gconf->name, NULL, context,
+                   PGC_S_FILE, false, true);
+         }
+     }
+
+ /* Revert to environment variable. PGPORT is ignored, because it cannot be
+      * set in running state. PGC_S_FILE is used instead PGC_S_ENV so as
+ * set_config_option can override previous defined option in config file. + * If these options are still in config file They will be overriden in
+      * the following step.
+      */
+     env = getenv("PGDATESTYLE");
+     if (env != NULL)
+     {
+         set_config_option("datestyle", env, context,
+                             PGC_S_FILE, false, true);
+     }
+
+     env = getenv("PGCLIENTENCODING");
+     if (env != NULL)
+     {
+         set_config_option("client_encoding", env, context,
+                             PGC_S_FILE, false, true);
+     }
+
     /* If we got here all the options checked out okay, so apply them. */
     for (item = head; item; item = item->next)
     {
Index: src/backend/utils/misc/guc.c
===================================================================
RCS file: /projects/cvsroot/pgsql/src/backend/utils/misc/guc.c,v
retrieving revision 1.319
diff -c -r1.319 guc.c
*** src/backend/utils/misc/guc.c    11 May 2006 19:15:35 -0000    1.319
--- src/backend/utils/misc/guc.c    24 May 2006 14:10:12 -0000
***************
*** 2648,2658 ****
struct config_bool *conf = (struct config_bool *) gconf;

                     if (conf->assign_hook)
!                         if (!(*conf->assign_hook) (conf->reset_val, true,
                                                    PGC_S_DEFAULT))
                             elog(FATAL, "failed to initialize %s to %d",
!                                  conf->gen.name, (int) conf->reset_val);
!                     *conf->variable = conf->reset_val;
                     break;
                 }
             case PGC_INT:
--- 2648,2658 ----
struct config_bool *conf = (struct config_bool *) gconf;

                     if (conf->assign_hook)
! if (!(*conf->assign_hook) (conf->default_val, true,
                                                    PGC_S_DEFAULT))
                             elog(FATAL, "failed to initialize %s to %d",
!                                  conf->gen.name, (int) conf->default_val);
!                     *conf->variable = conf->reset_val = conf->default_val;
                     break;
                 }
             case PGC_INT:
***************
*** 2662,2672 ****
                     Assert(conf->reset_val >= conf->min);
                     Assert(conf->reset_val <= conf->max);
                     if (conf->assign_hook)
!                         if (!(*conf->assign_hook) (conf->reset_val, true,
                                                    PGC_S_DEFAULT))
                             elog(FATAL, "failed to initialize %s to %d",
!                                  conf->gen.name, conf->reset_val);
!                     *conf->variable = conf->reset_val;
                     break;
                 }
             case PGC_REAL:
--- 2662,2672 ----
                     Assert(conf->reset_val >= conf->min);
                     Assert(conf->reset_val <= conf->max);
                     if (conf->assign_hook)
! if (!(*conf->assign_hook) (conf->default_val, true,
                                                    PGC_S_DEFAULT))
                             elog(FATAL, "failed to initialize %s to %d",
!                                  conf->gen.name, conf->default_val);
! *conf->variable = conf->reset_val = conf->default_val;
                     break;
                 }
             case PGC_REAL:
***************
*** 2676,2686 ****
                     Assert(conf->reset_val >= conf->min);
                     Assert(conf->reset_val <= conf->max);
                     if (conf->assign_hook)
!                         if (!(*conf->assign_hook) (conf->reset_val, true,
                                                    PGC_S_DEFAULT))
                             elog(FATAL, "failed to initialize %s to %g",
!                                  conf->gen.name, conf->reset_val);
!                     *conf->variable = conf->reset_val;
                     break;
                 }
             case PGC_STRING:
--- 2676,2686 ----
                     Assert(conf->reset_val >= conf->min);
                     Assert(conf->reset_val <= conf->max);
                     if (conf->assign_hook)
! if (!(*conf->assign_hook) (conf->default_val, true,
                                                    PGC_S_DEFAULT))
                             elog(FATAL, "failed to initialize %s to %g",
!                                  conf->gen.name, conf->default_val);
! *conf->variable = conf->reset_val = conf->default_val;
                     break;
                 }
             case PGC_STRING:
***************
*** 3647,3653 ****
         case PGC_POSTMASTER:
             if (context == PGC_SIGHUP)
             {
!                 if (changeVal && !is_newvalue_equal(record, value))
                     ereport(elevel,
                             (errcode(ERRCODE_CANT_CHANGE_RUNTIME_PARAM),
errmsg("parameter \"%s\" cannot be changed after server start; configuration file change ignored",
--- 3647,3653 ----
         case PGC_POSTMASTER:
             if (context == PGC_SIGHUP)
             {
! if (changeVal && value != NULL && !is_newvalue_equal(record, value))
                     ereport(elevel,
                             (errcode(ERRCODE_CANT_CHANGE_RUNTIME_PARAM),
errmsg("parameter \"%s\" cannot be changed after server start; configuration file change ignored",
***************
*** 3723,3729 ****
      * Should we set reset/stacked values?    (If so, the behavior is not
      * transactional.)
      */
! makeDefault = changeVal && (source <= PGC_S_OVERRIDE) && (value != NULL);

     /*
      * Ignore attempted set if overridden by previously processed setting.
--- 3723,3729 ----
      * Should we set reset/stacked values?    (If so, the behavior is not
      * transactional.)
      */
! makeDefault = changeVal && (source <= PGC_S_OVERRIDE) && (value != NULL || source == PGC_S_FILE);

     /*
      * Ignore attempted set if overridden by previously processed setting.
***************
*** 3766,3773 ****
                 }
                 else
                 {
!                     newval = conf->reset_val;
!                     source = conf->gen.reset_source;
                 }

                 if (conf->assign_hook)
--- 3766,3784 ----
                 }
                 else
                 {
! /* Revert value to default if source is configuration file. It is used when ! * configuration parameter is removed/commented out in the config file. Else ! * RESET or SET TO DEFAULT command is called and reset_val is used.
!                      */
!                     if( source == PGC_S_FILE )
!                     {
!                         newval =  conf->default_val;
!                     }
!                     else
!                     {
!                         newval = conf->reset_val;
!                         source = conf->gen.reset_source;
!                     }
                 }

                 if (conf->assign_hook)
***************
*** 3850,3857 ****
                 }
                 else
                 {
!                     newval = conf->reset_val;
!                     source = conf->gen.reset_source;
                 }

                 if (conf->assign_hook)
--- 3861,3879 ----
                 }
                 else
                 {
! /* Revert value to default if source is configuration file. It is used when ! * configuration parameter is removed/commented out in the config file. Else ! * RESET or SET TO DEFAULT command is called and reset_val is used.
!                      */
!                     if( source == PGC_S_FILE )
!                     {
!                         newval =  conf->default_val;
!                     }
!                     else
!                     {
!                         newval = conf->reset_val;
!                         source = conf->gen.reset_source;
!                     }
                 }

                 if (conf->assign_hook)
***************
*** 3934,3941 ****
                 }
                 else
                 {
!                     newval = conf->reset_val;
!                     source = conf->gen.reset_source;
                 }

                 if (conf->assign_hook)
--- 3956,3974 ----
                 }
                 else
                 {
! /* Revert value to default if source is configuration file. It is used when ! * configuration parameter is removed/commented out in the config file. Else ! * RESET or SET TO DEFAULT command is called and reset_val is used.
!                      */
!                     if( source == PGC_S_FILE )
!                     {
!                         newval =  conf->default_val;
!                     }
!                     else
!                     {
!                         newval = conf->reset_val;
!                         source = conf->gen.reset_source;
!                     }
                 }

                 if (conf->assign_hook)
***************
*** 4009,4014 ****
--- 4042,4061 ----
                     if (conf->gen.flags & GUC_IS_NAME)
                         truncate_identifier(newval, strlen(newval), true);
                 }
+                 else if (source == PGC_S_FILE)
+                 {
+ /* Revert value to default when item is removed from config file. */
+                     if ( conf->boot_val != NULL )
+                     {
+                         newval = guc_strdup(elevel, conf->boot_val);
+                         if (newval == NULL)
+                             return false;
+                     }
+                     else
+                     {
+                         return false;
+                     }
+                 }
                 else if (conf->reset_val)
                 {
                     /*
***************
*** 5111,5116 ****
--- 5158,5168 ----
 static bool
 is_newvalue_equal(struct config_generic *record, const char *newvalue)
 {
+     if( !newvalue )
+     {
+         return false;
+     }
+ switch (record->vartype)
     {
         case PGC_BOOL:
Index: src/include/utils/guc_tables.h
===================================================================
RCS file: /projects/cvsroot/pgsql/src/include/utils/guc_tables.h,v
retrieving revision 1.22
diff -c -r1.22 guc_tables.h
*** src/include/utils/guc_tables.h    5 Mar 2006 15:59:07 -0000    1.22
--- src/include/utils/guc_tables.h    24 May 2006 14:10:13 -0000
***************
*** 142,152 ****
     /* these fields must be set correctly in initial value: */
     /* (all but reset_val are constants) */
     bool       *variable;
!     bool        reset_val;
     GucBoolAssignHook assign_hook;
     GucShowHook show_hook;
     /* variable fields, initialized at runtime: */
     bool        tentative_val;
 };

 struct config_int
--- 142,153 ----
     /* these fields must be set correctly in initial value: */
     /* (all but reset_val are constants) */
     bool       *variable;
!     bool        default_val;
     GucBoolAssignHook assign_hook;
     GucShowHook show_hook;
     /* variable fields, initialized at runtime: */
     bool        tentative_val;
+     bool        reset_val;
 };

 struct config_int
***************
*** 155,167 ****
     /* these fields must be set correctly in initial value: */
     /* (all but reset_val are constants) */
     int           *variable;
!     int            reset_val;
     int            min;
     int            max;
     GucIntAssignHook assign_hook;
     GucShowHook show_hook;
     /* variable fields, initialized at runtime: */
     int            tentative_val;
 };

 struct config_real
--- 156,169 ----
     /* these fields must be set correctly in initial value: */
     /* (all but reset_val are constants) */
     int           *variable;
!     int            default_val;
     int            min;
     int            max;
     GucIntAssignHook assign_hook;
     GucShowHook show_hook;
     /* variable fields, initialized at runtime: */
     int            tentative_val;
+     int            reset_val;
 };

 struct config_real
***************
*** 170,182 ****
     /* these fields must be set correctly in initial value: */
     /* (all but reset_val are constants) */
     double       *variable;
!     double        reset_val;
     double        min;
     double        max;
     GucRealAssignHook assign_hook;
     GucShowHook show_hook;
     /* variable fields, initialized at runtime: */
     double        tentative_val;
 };

 struct config_string
--- 172,186 ----
     /* these fields must be set correctly in initial value: */
     /* (all but reset_val are constants) */
     double       *variable;
!     double        default_val;
     double        min;
     double        max;
     GucRealAssignHook assign_hook;
     GucShowHook show_hook;
     /* variable fields, initialized at runtime: */
     double        tentative_val;
+       double        reset_val;
+ };

 struct config_string


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