← Back to team overview

ubuntu-phone team mailing list archive

Re: SD Card access for applications

 

On 11/13/2014 12:54 PM, Florian Boucault wrote:
> One doubt I have: in the case of my Ubuntu computer being in another language
> (say French) I recall that the  /home/USER/Pictures directory was localized and
> actually called /home/USER/Images
> 
> Does that impact this discussion?
> 
It might, but we decided a long time ago that we would not support translated
directories at all:

"If we have to change the handling, I think I would be in favor of just using
the english names in Ubuntu touch and do the UI/toolkit work to make sure they
are displayed translated."

If the above isn't happening now for the SD card, then that should be adjusted.

> Florian
> 
> On Nov 13, 2014 3:08 PM, "Jamie Strandboge" <jamie@xxxxxxxxxxxxx
> <mailto:jamie@xxxxxxxxxxxxx>> wrote:
> 
>     On 11/13/2014 08:25 AM, Marc Deslauriers wrote:
>     > On 2014-11-12 11:58 AM, Jamie Strandboge wrote:
>     >> Pulling into CC various stakeholders.
>     >>
>     >> On 11/12/2014 09:47 AM, Florian Boucault wrote:
> 
>     ...
> 
>     >>> The camera and the gallery app today are authorized to read/write in
>     >>> /home/$USER/Pictures and /home/$USER/Videos.
>     >>> Soon they will also need to be able to read/write in the similar
>     directories of
>     >>> the SD card, for example:
>     >>> - /media/phablet/064a-7494/Pictures
>     >>> - /media/phablet/064a-7494/Videos
> 
>     ...
> 
>     >> We can then do something similar for apps. Eg, the predictable hierarchy for
>     >> apps might be:
>     >>   /media/$USER/$SDCARD_ID/.cache/$APP_PKGNAME
>     >>   /media/$USER/$SDCARD_ID/.config/$APP_PKGNAME
>     >>   /media/$USER/$SDCARD_ID/.local/share/$APP_PKGNAME
>     >>
>     >> such that the AppArmor templates add:
>     >>   owner /media/*/*/.cache/@{APP_PKGNAME}/         rw,
>     >>   owner /media/*/*/.cache/@{APP_PKGNAME}/**       mrwkl,
>     >>   owner /media/*/*/.config/@{APP_PKGNAME}/        rw,
>     >>   owner /media/*/*/.config/@{APP_PKGNAME}/**      mrwkl,
>     >>   owner /media/*/*/.local/share/@{APP_PKGNAME}/   rw,
>     >>   owner /media/*/*/.local/share/@{APP_PKGNAME}/** mrwklix,
>     >
>     > This is problematic. As you mention later on, sdcards mostly use vfat, which
>     > means file names are case insensitive. This opens up a lot of issues when
>     trying
>     > to confine apps to specific directories, and also creates issues with data
>     loss
>     > if the system isn't designed to cope well.
>     >
>     > If we want app-specific directories on the sdcard, we will likely have to
>     > require the card be formatted with a better filesystem, or we should punt on
>     > this for now.
>     >
> 
>     Ah yes, I forgot about the case-insensitive names. I also agree this is
>     problematic. With the global directories, we should therefore do:
> 
>     # SD card: /media/<user>/<label>/...
>     owner /media/*/*/[Pp][Ii][Cc][Tt][Uu][Rr][Ee][Ss]/   r,
>     owner /media/*/*/[Pp][Ii][Cc][Tt][Uu][Rr][Ee][Ss]/** rwk,
> 
>     That is easy enough.
> 
> 
>     Apps are hard though-- click-apparmor could be adjusted to instead of:
>     @{APP_APPNAME}="bar"
>     @{APP_PKGNAME}="com.ubuntu.developer.user.foo"
> 
>     do:
>     @{APP_APPNAME}="[Bb][Aa][Rr]"
>     @{APP_PKGNAME}="[Cc][Oo][Mm].[Uu][Bb][Uu][Nn][Tt][Uu].[Dd][Ee][Vv][Ee][Ll][Oo][Pp][Ee][Rr].[Uu][Ss][Ee][Rr].[Ff][Oo][Oo]"
> 
>     but yikes, I don't like that; plus I agree with your other points about what
>     happens when the card is pulled out. App-specific directories needs more thought
>     and planning.
> 
> 
>     --
>     Jamie Strandboge                 http://www.ubuntu.com/
> 
> 
> 


-- 
Jamie Strandboge                 http://www.ubuntu.com/

Attachment: signature.asc
Description: OpenPGP digital signature


References