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Don't allow data_directory to be set in postgresql.auto.conf by ALTER SYSTEM.

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data_directory could be set both in postgresql.conf and postgresql.auto.conf so far.
This could cause some problematic situations like circular definition. To avoid such
situations, this commit forbids a user to set data_directory in postgresql.auto.conf.

Backpatch this to 9.4 where ALTER SYSTEM command was introduced.

Amit Kapila, reviewed by Abhijit Menon-Sen, with minor adjustments by me.
This commit is contained in:
Fujii Masao
2014-06-19 20:31:20 +09:00
parent df8b7bc9ff
commit 9ba78fb0b9
3 changed files with 26 additions and 6 deletions
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21
src/backend/utils/misc/guc.c
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@ -3095,10 +3095,14 @@ static struct config_string ConfigureNamesString[] =
},
{
/*
* Can't be set by ALTER SYSTEM as it can lead to recursive definition
* of data_directory.
*/
{"data_directory", PGC_POSTMASTER, FILE_LOCATIONS,
gettext_noop("Sets the server's data directory."),
NULL,
GUC_SUPERUSER_ONLY
GUC_SUPERUSER_ONLY | GUC_DISALLOW_IN_AUTO_FILE
},
&data_directory,
NULL,
@ -6735,12 +6739,17 @@ AlterSystemSetConfigFile(AlterSystemStmt *altersysstmt)
(errcode(ERRCODE_UNDEFINED_OBJECT),
errmsg("unrecognized configuration parameter \"%s\"", name)));
/*
* Don't allow the parameters which can't be set in configuration
* files to be set in PG_AUTOCONF_FILENAME file.
*/
if ((record->context == PGC_INTERNAL) ||
(record->flags & GUC_DISALLOW_IN_FILE))
ereport(ERROR,
(errcode(ERRCODE_CANT_CHANGE_RUNTIME_PARAM),
errmsg("parameter \"%s\" cannot be changed",
name)));
(record->flags & GUC_DISALLOW_IN_FILE) ||
(record->flags & GUC_DISALLOW_IN_AUTO_FILE))
ereport(ERROR,
(errcode(ERRCODE_CANT_CHANGE_RUNTIME_PARAM),
errmsg("parameter \"%s\" cannot be changed",
name)));
if (!validate_conf_option(record, name, value, PGC_S_FILE,
ERROR, true, NULL,