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Make configuration parameters fall back to their default values when they

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are removed from the configuration file.

Joachim Wieland
This commit is contained in:
Peter Eisentraut
2007-04-21 20:02:41 +00:00
parent adf7788c5e
commit b7edb568bd
3 changed files with 259 additions and 38 deletions
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128
src/backend/utils/misc/guc.c
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@@ -10,7 +10,7 @@
* Written by Peter Eisentraut <peter_e@gmx.net>.
*
* IDENTIFICATION
* $PostgreSQL: pgsql/src/backend/utils/misc/guc.c,v 1.386 2007/04/18 16:44:18 alvherre Exp $
* $PostgreSQL: pgsql/src/backend/utils/misc/guc.c,v 1.387 2007/04/21 20:02:40 petere Exp $
*
*--------------------------------------------------------------------
*/
@@ -2481,7 +2481,8 @@ set_string_field(struct config_string * conf, char **field, char *newval)
if (oldval == NULL ||
oldval == *(conf->variable) ||
oldval == conf->reset_val ||
oldval == conf->tentative_val)
oldval == conf->tentative_val ||
oldval == conf->boot_val)
return;
for (stack = conf->gen.stack; stack; stack = stack->prev)
{
@@ -2504,7 +2505,8 @@ string_field_used(struct config_string * conf, char *strval)
if (strval == *(conf->variable) ||
strval == conf->reset_val ||
strval == conf->tentative_val)
strval == conf->tentative_val ||
strval == conf->boot_val)
return true;
for (stack = conf->gen.stack; stack; stack = stack->prev)
{
@@ -2673,6 +2675,18 @@ add_guc_variable(struct config_generic * var, int elevel)
return true;
}
static int
guc_get_index(const char *name)
{
int i;
for (i = 0; i < num_guc_variables; i++)
if (strcasecmp(name, guc_variables[i]->name) == 0)
return i;
return -1;
}
/*
* Create and add a placeholder variable. It's presumed to belong
* to a valid custom variable class at this point.
@@ -2851,39 +2865,39 @@ InitializeGUCOptions(void)
struct config_bool *conf = (struct config_bool *) gconf;
if (conf->assign_hook)
if (!(*conf->assign_hook) (conf->reset_val, true,
if (!(*conf->assign_hook) (conf->boot_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;
conf->gen.name, (int) conf->boot_val);
*conf->variable = conf->reset_val = conf->boot_val;
break;
}
case PGC_INT:
{
struct config_int *conf = (struct config_int *) gconf;
Assert(conf->reset_val >= conf->min);
Assert(conf->reset_val <= conf->max);
Assert(conf->boot_val >= conf->min);
Assert(conf->boot_val <= conf->max);
if (conf->assign_hook)
if (!(*conf->assign_hook) (conf->reset_val, true,
if (!(*conf->assign_hook) (conf->boot_val, true,
PGC_S_DEFAULT))
elog(FATAL, "failed to initialize %s to %d",
conf->gen.name, conf->reset_val);
*conf->variable = conf->reset_val;
conf->gen.name, conf->boot_val);
*conf->variable = conf->reset_val = conf->boot_val;
break;
}
case PGC_REAL:
{
struct config_real *conf = (struct config_real *) gconf;
Assert(conf->reset_val >= conf->min);
Assert(conf->reset_val <= conf->max);
Assert(conf->boot_val >= conf->min);
Assert(conf->boot_val <= conf->max);
if (conf->assign_hook)
if (!(*conf->assign_hook) (conf->reset_val, true,
if (!(*conf->assign_hook) (conf->boot_val, true,
PGC_S_DEFAULT))
elog(FATAL, "failed to initialize %s to %g",
conf->gen.name, conf->reset_val);
*conf->variable = conf->reset_val;
conf->gen.name, conf->boot_val);
*conf->variable = conf->reset_val = conf->boot_val;
break;
}
case PGC_STRING:
@@ -3945,6 +3959,13 @@ set_config_option(const char *name, const char *value,
return false;
}
/*
* Do not replace a value that has been set on the command line by a SIGHUP
* reload
*/
if (context == PGC_SIGHUP && record->source == PGC_S_ARGV)
return true;
/*
* Check if the option can be set at this time. See guc.h for the precise
* rules. Note that we don't want to throw errors if we're in the SIGHUP
@@ -4040,19 +4061,26 @@ set_config_option(const char *name, const char *value,
}
/*
* Should we set reset/stacked values? (If so, the behavior is not
* transactional.)
* Should we set reset/stacked values? (If so, the behavior is not
* transactional.) This is done either when we get a default
* value from the database's/user's/client's default settings or
* when we reset a value to its default.
*/
makeDefault = changeVal && (source <= PGC_S_OVERRIDE) && (value != NULL);
makeDefault = changeVal && (source <= PGC_S_OVERRIDE)
&& ((value != NULL) || source == PGC_S_DEFAULT);
/*
* Ignore attempted set if overridden by previously processed setting.
* However, if changeVal is false then plow ahead anyway since we are
* trying to find out if the value is potentially good, not actually use
* it. Also keep going if makeDefault is true, since we may want to set
* the reset/stacked values even if we can't set the variable itself.
* Ignore attempted set if overridden by previously processed
* setting. However, if changeVal is false then plow ahead anyway
* since we are trying to find out if the value is potentially
* good, not actually use it. Also keep going if makeDefault is
* true, since we may want to set the reset/stacked values even if
* we can't set the variable itself. There's one exception to
* this rule: if we want to apply the default value to variables
* that were removed from the configuration file. This is
* indicated by source == PGC_S_DEFAULT.
*/
if (record->source > source)
if (record->source > source && source != PGC_S_DEFAULT)
{
if (changeVal && !makeDefault)
{
@@ -4084,6 +4112,14 @@ set_config_option(const char *name, const char *value,
return false;
}
}
/*
* If value == NULL and source == PGC_S_DEFAULT then
* we reset some value to its default (removed from
* configuration file).
*/
else if (source == PGC_S_DEFAULT)
newval = conf->boot_val;
/* else we handle a "RESET varname" command */
else
{
newval = conf->reset_val;
@@ -4168,6 +4204,14 @@ set_config_option(const char *name, const char *value,
return false;
}
}
/*
* If value == NULL and source == PGC_S_DEFAULT then
* we reset some value to its default (removed from
* configuration file).
*/
else if (source == PGC_S_DEFAULT)
newval = conf->boot_val;
/* else we handle a "RESET varname" command */
else
{
newval = conf->reset_val;
@@ -4252,6 +4296,14 @@ set_config_option(const char *name, const char *value,
return false;
}
}
/*
* If value == NULL and source == PGC_S_DEFAULT then
* we reset some value to its default (removed from
* configuration file).
*/
else if (source == PGC_S_DEFAULT)
newval = conf->boot_val;
/* else we handle a "RESET varname" command */
else
{
newval = conf->reset_val;
@@ -4330,6 +4382,23 @@ set_config_option(const char *name, const char *value,
if (conf->gen.flags & GUC_IS_NAME)
truncate_identifier(newval, strlen(newval), true);
}
/*
* If value == NULL and source == PGC_S_DEFAULT then
* we reset some value to its default (removed from
* configuration file).
*/
else if (source == PGC_S_DEFAULT)
{
if (conf->boot_val == NULL)
newval = NULL;
else
{
newval = guc_strdup(elevel, conf->boot_val);
if (newval == NULL)
return false;
}
}
/* else we handle a "RESET varname" command */
else if (conf->reset_val)
{
/*
@@ -6404,6 +6473,13 @@ assign_custom_variable_classes(const char *newval, bool doit, GucSource source)
int c;
StringInfoData buf;
/*
* Resetting custom_variable_classes by removing it from the
* configuration file will lead to newval = NULL
*/
if (newval == NULL)
return guc_strdup(ERROR, "");
initStringInfo(&buf);
while ((c = *cp++) != 0)
{
@@ -6448,7 +6524,7 @@ assign_custom_variable_classes(const char *newval, bool doit, GucSource source)
if (buf.len == 0)
newval = NULL;
else if (doit)
newval = strdup(buf.data);
newval = guc_strdup(ERROR, buf.data);
pfree(buf.data);
return newval;