This is likely to be an artefact of Moodle 2.x's file system. It is completely unlike the Moodle 1.x system. Details are here:
http://docs.moodle.org/dev/File_API_internals
Files you upload to Moodle are named, on disk, as the SHA1 digest of their contents. This digest is stored in Moodle's database together with the name you gave the file. So when you request a Moodle file, you are asking the database to look up the SHA1 digest associated with the name you gave the file, and then to find a file on the disk whose name matches that digest. (Phew!)
However, I cannot reproduce the problem Ivan describes. I uploaded a file called "Русский" to my test installation of Moodle, and can download it fine.
What database are you using? If it is MySQL, you should check the character set and collation of the database as follows:
mysql> show create database moodle;
+----------+-----------------------------------------------------------------------------------------+
| Database | Create Database |
+----------+-----------------------------------------------------------------------------------------+
| moodle | CREATE DATABASE `moodle` /*!40100 DEFAULT CHARACTER SET utf8 COLLATE utf8_unicode_ci */ |
+----------+-----------------------------------------------------------------------------------------+
1 row in set (0.00 sec)
Note that the character set is utf8 and the collation is utf8_unicode_ci;
mysql> SELECT `table_collation` FROM `information_schema`.`tables` WHERE `table_schema` = 'moodle' AND `table_name` = 'mdl_files';
You should get one row:
+-----------------+
| table_collation |
+-----------------+
| utf8_unicode_ci |
+-----------------+
1 row in set (0.00 sec)
Next, check the collation of the columns in the table.
mysql> SHOW FULL COLUMNS FROM `moodle`.`mdl_files`;
Look at the "Collation" column. You should see NULL for any BIGINT columns, and utf8_unicode_ci for the VARCHAR and LONGTEXT columns.
If everything is as expected, you need to check the collation of the connection from your web server to your database. You can do this by creating a file in your Moodle webserver's root with the following contents:
<?php
echo '<pre>';
include_once('config.php');
print_r($DB->get_records_sql("show local variables like 'character_set_connection'"));
print_r($DB->get_records_sql("show local variables like 'collation_connection'"));
This should give you a page that looks like this:
Array
(
[character_set_connection] => stdClass Object
(
[variable_name] => character_set_connection
[value] => utf8
)
)
Array
(
[collation_connection] => stdClass Object
(
[variable_name] => collation_connection
[value] => utf8_general_ci
)
)
Although there are a number of utf8-compatible collations you could use, I am not sure Moodle is 100% compatible with them all.
I'd be interested to know your results.
Chris
