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Force LC_COLLATE to C in postmaster.

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Avoid dependence on setlocale().

strcoll(), etc., are not called directly; all collation-sensitive
calls should go through pg_locale.c and use the appropriate
provider. By setting LC_COLLATE to C, we avoid accidentally depending
on libc behavior when using a different provider.

No behavior change in the backend, but it's possible that some
extensions will be affected. Such extensions should be updated to use
the pg_locale_t APIs.

Discussion: https://postgr.es/m/9875f7f9-50f1-4b5d-86fc-ee8b03e8c162@eisentraut.org
Reviewed-by: Peter Eisentraut <peter@eisentraut.org>
This commit is contained in:
Jeff Davis
2025-07-16 14:13:18 -07:00
parent 0858f0f96e
commit 5e6e42e44f
6 changed files with 42 additions and 37 deletions
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11
src/backend/utils/init/postinit.c
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@@ -417,12 +417,11 @@ CheckMyDatabase(const char *name, bool am_superuser, bool override_allow_connect
datum = SysCacheGetAttrNotNull(DATABASEOID, tup, Anum_pg_database_datctype);
ctype = TextDatumGetCString(datum);
if (pg_perm_setlocale(LC_COLLATE, collate) == NULL)
ereport(FATAL,
(errmsg("database locale is incompatible with operating system"),
errdetail("The database was initialized with LC_COLLATE \"%s\", "
" which is not recognized by setlocale().", collate),
errhint("Recreate the database with another locale or install the missing locale.")));
/*
* Historcally, we set LC_COLLATE from datcollate, as well. That's no
* longer necessary because all collation behavior is handled through
* pg_locale_t.
*/
if (pg_perm_setlocale(LC_CTYPE, ctype) == NULL)
ereport(FATAL,