Re: [Tuxmath-devel] Prerendered PNG cache for SVG sprites

[Wenyuan G. <guo...@gm...>]

Hmm...I see. That makes sense. Give me a bit of time to fix up that one!

Wenyuan

On Sat, Jun 12, 2010 at 2:56 AM, David Bruce <dav...@gm...> wrote:
> Hi Wenyuan,
>
> On Fri, Jun 11, 2010 at 7:52 AM, Tim Holy <ho...@wu...> wrote:
>> Hi Wenyuan,
>>
>> On Thursday, June 10, 2010 11:41:45 pm Wenyuan Guo wrote:
>>> Do you have write access to your tuxmath install directory (in my
>>> case, /usr/local/share/tuxmath) and whether there is enough disk
>>> space? The caching PNG files will be written to the same directories
>>> where the original SVG sprites are located.
>>
>> On Linux systems, the typical default (e.g., for distributor-supplied
>> packages, or a default make install) is to have the SVGs in some system
>> directory, to which users do not have write access.
>
> I agree - the PNG cache can't be located under the install directory,
> because that will not be writeable by ordinary users.  This situation
> has a lot in common with the "custom word list" tuxtype project from
> last summer - ideally, we might want to have an area that is writeable
> by tuxmath and readable by all users.  Our high score table has
> similar considerations. I found out that this is a thorny problem for
> distro packagers - if they are into security, they won't allow any
> files that are user-writeable outside of /home.  The traditional way
> to handle this is to make the file setgid for games, and put tuxtype
> into the games group.  Some distros (e.g. Fedora) didn't even like
> that idea, and said we ought to write a dedicated daemon to handle
> such file operations.  At that point, I gave up for the time being.
>
> For this case, I think we should just put the cache under ~/.tuxmath.
> If tuxmath subsequently gets run by another user, nothing bad will
> happen except for the slower startup the first time while the
> rescaling takes place.
>
> Cheers,
>
> David Bruce
>
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