Jeff Davis <pg...@j-davis.com> writes:
> The following SQL succeeds:
> create database foodb with
> template = template0
> encoding = 'UTF8'
> lc_collate=''
> lc_ctype='';
Sure.
> Surely we don't want it to be set from the environment, right?
Why not? We have always done that, and in fact the various lc_xxx GUC
variables are documented thusly:
If this variable is set to the empty string (which is the
default) then the value is inherited from the execution
environment of the server in a system-dependent way.
The "trivial patch" you propose breaks that behavior.
I do agree that it's probably unwise to store an empty string as the
value of pg_database.datcollate or datctype, because that would mean
that if the server is restarted with different LC_XXX environment values
then it will think the database has different locale settings, leading
to havoc. However, ISTM the right fix is to replace an empty-string
value with the implied locale name at createdb time. Proposed patch
attached.
Note 1: there's no need to change the behavior for the locale GUCs,
since we don't have any assumptions that those hold still over server
restarts.
Note 2: there is code in initdb that is supposed to be kept parallel
to this, but it's not currently making any attempt to canonicalize
non-empty locale names. Should we make it do that too?
regards, tom lane
diff --git a/src/backend/commands/dbcommands.c b/src/backend/commands/dbcommands.c
index 91d74815287c1f6d46359b1a0ad0bddd0fd763be..9721ce9e0a6562b8b934c786adcc01eafd28b20c 100644
*** a/src/backend/commands/dbcommands.c
--- b/src/backend/commands/dbcommands.c
*************** createdb(const CreatedbStmt *stmt)
*** 123,128 ****
--- 123,129 ----
const char *dbtemplate = NULL;
char *dbcollate = NULL;
char *dbctype = NULL;
+ char *canonname;
int encoding = -1;
int dbconnlimit = -1;
int notherbackends;
*************** createdb(const CreatedbStmt *stmt)
*** 318,332 ****
(errcode(ERRCODE_WRONG_OBJECT_TYPE),
errmsg("invalid server encoding %d", encoding)));
! /* Check that the chosen locales are valid */
! if (!check_locale(LC_COLLATE, dbcollate))
ereport(ERROR,
(errcode(ERRCODE_WRONG_OBJECT_TYPE),
errmsg("invalid locale name %s", dbcollate)));
! if (!check_locale(LC_CTYPE, dbctype))
ereport(ERROR,
(errcode(ERRCODE_WRONG_OBJECT_TYPE),
errmsg("invalid locale name %s", dbctype)));
check_encoding_locale_matches(encoding, dbcollate, dbctype);
--- 319,335 ----
(errcode(ERRCODE_WRONG_OBJECT_TYPE),
errmsg("invalid server encoding %d", encoding)));
! /* Check that the chosen locales are valid, and get canonical spellings */
! if (!check_locale(LC_COLLATE, dbcollate, &canonname))
ereport(ERROR,
(errcode(ERRCODE_WRONG_OBJECT_TYPE),
errmsg("invalid locale name %s", dbcollate)));
! dbcollate = canonname;
! if (!check_locale(LC_CTYPE, dbctype, &canonname))
ereport(ERROR,
(errcode(ERRCODE_WRONG_OBJECT_TYPE),
errmsg("invalid locale name %s", dbctype)));
+ dbctype = canonname;
check_encoding_locale_matches(encoding, dbcollate, dbctype);
diff --git a/src/backend/utils/adt/pg_locale.c b/src/backend/utils/adt/pg_locale.c
index 9f112e8c5cb7f0f3b4f9a6a522b041e418b90b23..627172f48e02faa303215962aaab69de05448dfe 100644
*** a/src/backend/utils/adt/pg_locale.c
--- b/src/backend/utils/adt/pg_locale.c
*************** pg_perm_setlocale(int category, const ch
*** 222,233 ****
/*
* Is the locale name valid for the locale category?
*/
bool
! check_locale(int category, const char *value)
{
char *save;
! bool ret;
save = setlocale(category, NULL);
if (!save)
--- 222,240 ----
/*
* Is the locale name valid for the locale category?
+ *
+ * If successful, and canonname isn't NULL, a palloc'd copy of the locale's
+ * canonical name is stored there. This is especially useful for figuring out
+ * what locale name "" means (ie, the server environment value).
*/
bool
! check_locale(int category, const char *locale, char **canonname)
{
char *save;
! char *res;
!
! if (canonname)
! *canonname = NULL; /* in case of failure */
save = setlocale(category, NULL);
if (!save)
*************** check_locale(int category, const char *v
*** 237,250 ****
save = pstrdup(save);
/* set the locale with setlocale, to see if it accepts it. */
! ret = (setlocale(category, value) != NULL);
/* restore old value. */
if (!setlocale(category, save))
elog(WARNING, "failed to restore old locale");
pfree(save);
! return ret;
}
--- 244,261 ----
save = pstrdup(save);
/* set the locale with setlocale, to see if it accepts it. */
! res = setlocale(category, locale);
!
! /* save canonical name if requested. */
! if (res && canonname)
! *canonname = pstrdup(res);
/* restore old value. */
if (!setlocale(category, save))
elog(WARNING, "failed to restore old locale");
pfree(save);
! return (res != NULL);
}
*************** check_locale(int category, const char *v
*** 262,268 ****
bool
check_locale_monetary(char **newval, void **extra, GucSource source)
{
! return check_locale(LC_MONETARY, *newval);
}
void
--- 273,279 ----
bool
check_locale_monetary(char **newval, void **extra, GucSource source)
{
! return check_locale(LC_MONETARY, *newval, NULL);
}
void
*************** assign_locale_monetary(const char *newva
*** 274,280 ****
bool
check_locale_numeric(char **newval, void **extra, GucSource source)
{
! return check_locale(LC_NUMERIC, *newval);
}
void
--- 285,291 ----
bool
check_locale_numeric(char **newval, void **extra, GucSource source)
{
! return check_locale(LC_NUMERIC, *newval, NULL);
}
void
*************** assign_locale_numeric(const char *newval
*** 286,292 ****
bool
check_locale_time(char **newval, void **extra, GucSource source)
{
! return check_locale(LC_TIME, *newval);
}
void
--- 297,303 ----
bool
check_locale_time(char **newval, void **extra, GucSource source)
{
! return check_locale(LC_TIME, *newval, NULL);
}
void
*************** check_locale_messages(char **newval, voi
*** 322,328 ****
* On Windows, we can't even check the value, so accept blindly
*/
#if defined(LC_MESSAGES) && !defined(WIN32)
! return check_locale(LC_MESSAGES, *newval);
#else
return true;
#endif
--- 333,339 ----
* On Windows, we can't even check the value, so accept blindly
*/
#if defined(LC_MESSAGES) && !defined(WIN32)
! return check_locale(LC_MESSAGES, *newval, NULL);
#else
return true;
#endif
diff --git a/src/include/utils/pg_locale.h b/src/include/utils/pg_locale.h
index 448c01a69712c99ee04bfff44d69138bafb76ece..3c38aa272926f775de41eb5d685f5ce4de84ac2f 100644
*** a/src/include/utils/pg_locale.h
--- b/src/include/utils/pg_locale.h
*************** extern void assign_locale_numeric(const
*** 42,48 ****
extern bool check_locale_time(char **newval, void **extra, GucSource source);
extern void assign_locale_time(const char *newval, void *extra);
! extern bool check_locale(int category, const char *locale);
extern char *pg_perm_setlocale(int category, const char *locale);
extern bool lc_collate_is_c(Oid collation);
--- 42,48 ----
extern bool check_locale_time(char **newval, void **extra, GucSource source);
extern void assign_locale_time(const char *newval, void *extra);
! extern bool check_locale(int category, const char *locale, char **canonname);
extern char *pg_perm_setlocale(int category, const char *locale);
extern bool lc_collate_is_c(Oid collation);
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