[Fontconfig] Cache and FAT

Behdad Esfahbod behdad at behdad.org
Tue Dec 8 18:18:18 PST 2009

On 12/06/2009 07:34 PM, Mikhail Gusarov wrote:
> Hi.
> I've recently stumbled upon problem with FAT filesystem updated by
> Windowoze (SD card in my case) and fontconfig cache. Problem boils down
> to the Windows not updating mtime of directory when file is added or
> removed from directory, so fontconfig does not rebuild cache as it
> checks only mtime and size of directory.
> I'd like to fix this problem and submit patch upstream, but first I'd
> like to ask for a correct way to fix it.

I let our win32 hackers respond before making a decision either way.  Tor?

> Ideas came to my mind so far are:
> 1) scan directory and subdirectories and use max(mtimes, ctimes) of all
>     files as mtime of directory.

Would be a PITA.

> 2) add "hash" field to directory cache which is hash of all
>     subdirectories' hashes and directory contents.

Isn't option #1 superior to this?  And doesn't need a change to the cache format.

> Also this check should be conditional to avoid any overhead on more
> conventional filesystems.


> is it a good idea to add boolean attribute for <dir>  entry in config?

No.  Why?

Please file a bug so we can track this.

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